The electrical impedance of a living tissue reflects its cell construction and physiological activity. For this purpose we developed an automatic sensing device of electrical tissue characteristics. The system is composed of a part measuring impedance at multifrequency points and a part analyzing parameters of dispersion of bioelectrical impedance, impedances are measured at eight frequency points of 1 kHz-500 kHz. The parameters for Cole-Cole arc's law are determined automatically by a personal computer program
en-copyright= kn-copyright= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=HaradaHiroshi en-aut-sei=Harada en-aut-mei=Hiroshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=YasuharaKiyotaka en-aut-sei=Yasuhara en-aut-mei=Kiyotaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Takamatsu National College of Technology en-keyword=biological techniques kn-keyword=biological techniques en-keyword=cellular biophysics kn-keyword=cellular biophysics en-keyword=computerised instrumentation kn-keyword=computerised instrumentation en-keyword=electric impedance kn-keyword=electric impedance en-keyword=measurement kn-keyword=measurement en-keyword=electric sensing devices kn-keyword=electric sensing devices END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue=3 article-no= start-page=729 end-page=732 dt-received= dt-revised= dt-accepted= dt-pub-year=1995 dt-pub=19956 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Automatic sensing device of electrical characteristics of living trees en-subtitle= kn-subtitle= en-abstract= kn-abstract=The electrical impedance of a living tissue reflects its cell construction and physiological activity. For this purpose we developed an automatic sensing device of electrical tissue characteristics. The system is composed of a part measuring impedance at multifrequency points and a part analyzing parameters of dispersion of bioelectrical impedance, impedances are measured at eight frequency points of 1 kHz-500 kHz. The parameters for Cole-Cole arc's law are determined automatically by a personal computer program
en-copyright= kn-copyright= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=HaradaHiroshi en-aut-sei=Harada en-aut-mei=Hiroshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=YasuharaKiyotaka en-aut-sei=Yasuhara en-aut-mei=Kiyotaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Okayama University en-keyword=biological techniques kn-keyword=biological techniques en-keyword=cellular biophysics kn-keyword=cellular biophysics en-keyword=computerised instrumentation kn-keyword=computerised instrumentation en-keyword=electric impedance kn-keyword=electric impedance en-keyword=measurement kn-keyword=measurement en-keyword=electric sensing devices kn-keyword=electric sensing devices END start-ver=1.4 cd-journal=joma no-vol=45 cd-vols= no-issue= article-no= start-page=483 end-page=487 dt-received= dt-revised= dt-accepted= dt-pub-year=1996 dt-pub=19964 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Instantaneous measurement of electrical parameters in a palm during electrodermal activity en-subtitle= kn-subtitle= en-abstract= kn-abstract=The determination of impedance can be performed by means of a frequency-domain analysis or a time-domain analysis. The latter has the advantage of being able to measure instantaneously all the frequency characteristics of impedance. The method is hence well suited to obtain the biological impedance which changes with time. An instantaneous method of measuring skin impedance, by using time-domain analysis has thus been developed. The fast Fourier transform (FFT) of the step response for current to the skin can determine the palm impedance. This method can carry out the determination of the parameters of the palm skin impedance during a galvanic skin reflex (GSR), which is impossible by means of frequency-domain analysis
en-copyright= kn-copyright= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=IsshikiHiromi en-aut-sei=Isshiki en-aut-mei=Hiromi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Takuma National College of Technology affil-num=3 en-affil= kn-affil=Okayama University en-keyword=bioelectric phenomena kn-keyword=bioelectric phenomena en-keyword=electric impedance measurement kn-keyword=electric impedance measurement en-keyword=fast Fourier transforms kn-keyword=fast Fourier transforms en-keyword=medical kn-keyword=medical en-keyword=signal processing kn-keyword=signal processing en-keyword=signal detection kn-keyword=signal detection en-keyword=skin kn-keyword=skin en-keyword=step response kn-keyword=step response en-keyword=time-domain analysis kn-keyword=time-domain analysis en-keyword=transient kn-keyword=transient en-keyword=response kn-keyword=response en-keyword=waveform analysis kn-keyword=waveform analysis END start-ver=1.4 cd-journal=joma no-vol=45 cd-vols= no-issue=2 article-no= start-page=483 end-page=487 dt-received= dt-revised= dt-accepted= dt-pub-year=1996 dt-pub=19964 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Instantaneous measurement of electrical parameters in a palm during electrodermal activity en-subtitle= kn-subtitle= en-abstract= kn-abstract=The determination of impedance can be performed by means of a frequency-domain analysis or a time-domain analysis. The latter has the advantage of being able to measure instantaneously all the frequency characteristics of impedance. The method is hence well suited to obtain the biological impedance which changes with time. An instantaneous method of measuring skin impedance, by using time-domain analysis has thus been developed. The fast Fourier transform (FFT) of the step response for current to the skin can determine the palm impedance. This method can carry out the determination of the parameters of the palm skin impedance during a galvanic skin reflex (GSR), which is impossible by means of frequency-domain analysis
en-copyright= kn-copyright= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=IsshikiHiromi en-aut-sei=Isshiki en-aut-mei=Hiromi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Takuma National College of Technology affil-num=3 en-affil= kn-affil=Okayama University en-keyword=bioelectric phenomena kn-keyword=bioelectric phenomena en-keyword=electric impedance measurement kn-keyword=electric impedance measurement en-keyword=fast Fourier transforms kn-keyword=fast Fourier transforms en-keyword=medical kn-keyword=medical en-keyword=signal processing kn-keyword=signal processing en-keyword=signal detection kn-keyword=signal detection en-keyword=skin kn-keyword=skin en-keyword=step response kn-keyword=step response en-keyword=time-domain analysis kn-keyword=time-domain analysis en-keyword=transient kn-keyword=transient en-keyword=response kn-keyword=response en-keyword=waveform analysis kn-keyword=waveform analysis END start-ver=1.4 cd-journal=joma no-vol=1 cd-vols= no-issue= article-no= start-page=231 end-page=234 dt-received= dt-revised= dt-accepted= dt-pub-year=1998 dt-pub=19985 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Consideration of conditions required for multi-channel simultaneous bioimpedance measurement en-subtitle= kn-subtitle= en-abstract= kn-abstract=Impedance techniques have been widely applied to the biomedical engineering field. In order to obtain definite results from bioimpedance, multi-channel measurement is effective. A linearity of biological tissue and fundamental technical parameters for the instrument must be confirmed. In this study, the fundamental conditions have been investigated for multi-channel bioimpedance measurement and the condition of measurement for biological tissue has been confirmed. The differences of every measurement frequency should be appropriate to 1 kHz and it has been shown that the linearity of biological tissue is maintained. Based on these results, a two-channel bioimpedance measurement instrument has been constructed
en-copyright= kn-copyright= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=KusuharaToshimasa en-aut-sei=Kusuhara en-aut-mei=Toshimasa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=AdliMr. en-aut-sei=Adli en-aut-mei=Mr. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Okayama University en-keyword=bioelectric phenomena kn-keyword=bioelectric phenomena en-keyword=biomedical measurement kn-keyword=biomedical measurement en-keyword=electric impedance measurement kn-keyword=electric impedance measurement END start-ver=1.4 cd-journal=joma no-vol=10 cd-vols= no-issue=1 article-no= start-page=15 end-page=22 dt-received= dt-revised= dt-accepted= dt-pub-year=1999 dt-pub=19991220 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Variations of parameters of bioelectrical impedance during upper limb movement kn-title=上肢運動に伴う生体電気インピーダンスのパラメータの変動 en-subtitle= kn-subtitle= en-abstract=We have proposed new biodynamic analysis methods using bioelectrical impedance. Variations of human limb electrical impedance during biodynamics were caused by variations of equivalent cross sectional area of muscle and variations of blood volume. However these variations could not be directly measured. Therefore quantitative discussions about relation between the impedance and these variations have been insufficient. In this work, we explained variations of the impedance with variations of parameters of an equivalent circuit. The model of impedance was Cole-Cole type. The equivalent circuit consisted of five individual parameters as follows : extracellular fluid resistance, 'Re', intracellular fluid resistance, 'Ri', characteristic frequency of dispersion, 'fm' and parameters of dispersion of relaxation time, 'α' and 'β'. Impedances of forearm and upper arm were measured with four electrode method during flexion and extension of joints in upper limb. The ratio of variations of equivalent series resistance R was linear-approximated using the above mentioned parameters. The influences of parameters on variations of R was confirmed. R was strongly influenced by Re and Ri, However there were differences between influence of Re and that of Ri in difference measured part and difference joint movement. This showed the conditibn of the muscle. In case of the maximum flexion of the elbow joint, R of upper arm was influenced by fm. This means that a polarization of cell membrane changes and influences impedance during movement. These results are significant in evaluation of biodynamics including difference of strength of movement and condition of exhaustion. kn-abstract=これまでに生体電気インピーダンスを用いて身体運動の解析を行ってきた。インピーダンスの変動原因は測定部位の等価断面積変化および貯血量変化と説明できるが，直接的に断面積変化や貯血量変化を測定することは困難であるため，その変動原因の定量的な検討は不十分であった。そこで，本研究では上肢運動に伴う生体電気インピーダンスの変動原因を生体の等価回路のパラメータの変動で説明する。インピーダンスのモデルはCole－Cole型であり，等価回路は，細胞外液抵抗Re，細胞内液抵抗Ri，分散の特性周波fm fm，緩和時間の分布の程度を表すα，βの独立した5パラメータで表現した。 上肢の肘関節および手関節の屈曲運動野に伴う前腕部および上腕部の電気インピーダンスを測定した。まず，電気インピーダンスの等価直列抵抗Rの変動率をパラメータの変動率で線形近似し，その信頼性と各パラメータ変動のRへの影響を確認した。Rへの影響はReとRiが支配的であるが，測定部位や運動の違いにより，それぞれの影響が異なることを示した。これは測定部位の筋活動状態の違いを表すものである。さらに，肘関節最大屈曲におけるRの変化にはfmの変化が大きく依存しており，上肢運動のインピーダンス変化には細胞膜の分極特性の変化も影響していることを明らかにした。本研究の結果は，運動強度の違いや疲労状態における身体運動評価に有意義である。 en-copyright= kn-copyright= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name=中村隆夫 kn-aut-sei=中村 kn-aut-mei=隆夫 aut-affil-num=1 ORCID= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name=山本尚武 kn-aut-sei=山本 kn-aut-mei=尚武 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=2 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 en-keyword=生体電気インピーダンス (bioelectrical impedance) kn-keyword=生体電気インピーダンス (bioelectrical impedance) en-keyword=等価回路 (equivalent circuit) kn-keyword=等価回路 (equivalent circuit) en-keyword=Cole-Cole円弧 (Cole-Cole circular loci) kn-keyword=Cole-Cole円弧 (Cole-Cole circular loci) en-keyword=上肢運動 (upper limb movement) kn-keyword=上肢運動 (upper limb movement) en-keyword=4電極法 (four electrode method) kn-keyword=4電極法 (four electrode method) END start-ver=1.4 cd-journal=joma no-vol=10 cd-vols= no-issue=2 article-no= start-page=107 end-page=115 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000324 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=生体電気信号の計測システムへの電力線からの誘導障害に関するインターフェイスモデル kn-title=Modelling of interface construction relating to power-line interference phenomenon in biopotential signal measurement system en-subtitle= kn-subtitle= en-abstract=生体電気信号の測定における電力線からの誘導障害についての研究が多く報告されているが，この現象についての説明が十分なされていなかった。本研究では，この現象を簡単なインターフェイスモデルを用いて説明した。誘導障害の原因として，電極の導線が作るループ内に発生する誘導起電力，システムの変位電流，生体アンプ内で発生する雑音等があげられる。本研究においては，電力線と導線との静電結合によってその間を流れる変位電流と被験者と電極間のインピーダンスに注目した。この変位電流による誘導は，いくつかの要素に依存している。それらは，・被験者と電力線との距離，・被験者に対する電力線の方向，・導線のシールドされていない部分の長さ，・被験者と電極間のインピーダンスである。そこで，被験者と電力線との距離や導線のシールドされていない部分の長さなどを変化させて，心電図の測定を行った。被験者と電極間のインピーダンスを調整できるように，可変抵抗を用いたRC並列回路をそれぞれの導線に直列に接続した。また，導線のループに発生する誘導起電力をできるだけ小さくするために，導線を互いに撚ってループ面積を小さくした。誘導雑音は，以下の場合に大きくなった。・電力線の距離が近い。・導線のシールドされてない部分が長い。・被験者と電極間のインピーダンスが大きく，不均衡である。また，被験者と電極間のインピーダンスを等しくした場合でも，誘導雑音が観測された。電力線の位置により各導線と電力線との静電結合状態が異なり，各導線に流れる変位電流が等しくないことが誘導雑音の原因であることを示した。本研究では被験者と電極間のインピーダンスおよび変位電流による誘導雑音の影響について検討した。この現象の理解は誘導障害の除去に大変有益なものである。 kn-abstract=A modelling of interface construction relating to power-line interference phenomenon was described. Source of interference was displacement currents which flowed from AC power-line configuration (APC) to a model. The interference depends on some factors: distance between the APC and a model ; length of unshielded leads ; position of the APC in vertical or horizontal direction ; and skin-electrode impedances which were balance or unbalanced. The position of APC and skin-electrode impedances were important in contributing of the interference. The interference was still large even though skin-electrode impedances were balance. This was caused by the disagreement in two displacement currents. It was overcame by adjustment of APC in vertical direction. As a result, total interference would be very small or zero. The result shows that interference in ECG signal recording can be eliminated to about 10 μV. Although interference of power-lines is a complicated phenomenon, the problem is easier to understand by using this modelling. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=Adli kn-aut-sei=Adli kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name=山本尚武 kn-aut-sei=山本 kn-aut-mei=尚武 aut-affil-num=2 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name=中村隆夫 kn-aut-sei=中村 kn-aut-mei=隆夫 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学大学院自然科学研究科 affil-num=2 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=3 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 en-keyword=AC power-line configuration (APC) (電力線配置) kn-keyword=AC power-line configuration (APC) (電力線配置) en-keyword=biopotential signal (生体電気信号) kn-keyword=biopotential signal (生体電気信号) en-keyword=displacement current (変位電流) kn-keyword=displacement current (変位電流) en-keyword=physical model of interference (モデル) kn-keyword=physical model of interference (モデル) en-keyword=power-line interference (誘導障害) kn-keyword=power-line interference (誘導障害) END start-ver=1.4 cd-journal=joma no-vol=11 cd-vols= no-issue=2 article-no= start-page=65 end-page=70 dt-received= dt-revised= dt-accepted= dt-pub-year=2001 dt-pub=20010324 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Relationships between electrical impedance and light transmission of flowing blood kn-title=流動血液の電気インピーダンスと透過光強度との関係 en-subtitle= kn-subtitle= en-abstract=The purpose of this study was to investigate the characteristics of light transmission and electrical impedance of flowing blood in an artificial vessel including stenosis. The artificial blood vessel consisted of a rigid flow-through model. The method of impedance measurement used the four-electrodes technique based on sinusoidal.current (10 kHz). Light (940 nm) was guided to the model by an optical fiber and transmitted light and was picked up by a similar fiber on the opposite side. Relative change in light transmission and electrical impedance decreased with increasing blood flow in general. But the relative change in light transmission and electrical impedance varied differently comparing measurements close to the stenosis and at different distances from the stenosis. kn-abstract=流動する血液についての力学的，光学的および電気的な特性についての研究が数多く報告されている。本研究では，狭窄がある人工血管を流れる血液の電気インピーダンス（周波数10kHz）を近赤外光（波長940nm）の透過度と同時に測定し，血液の電気インピーダンスの特性について検討を行った。内径2mmのアクリル製の血管モデルを作製し，その内部に断面積の小さい狭窄部位を1ヵ所設置し，ヒトの血液（Hct40％）を流した。定常流においては血流速度の増加に伴いインピーダンスの相対変化量および透過光強度ともに減少した。しかし，狭窄部に近い部位では，インピーダンスと透過光強度の変化パターンに違いがみられた。インピーダンスおよび透過光強度は流動する血球の動きや配向等を反映していると考えられた。 en-copyright= kn-copyright= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name=中村隆夫 kn-aut-sei=中村 kn-aut-mei=隆夫 aut-affil-num=1 ORCID= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name=山本尚武 kn-aut-sei=山本 kn-aut-mei=尚武 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=2 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 en-keyword=流動血液 (flowing blood) kn-keyword=流動血液 (flowing blood) en-keyword=生体電気インピーダンス (bioelectrical impedance) kn-keyword=生体電気インピーダンス (bioelectrical impedance) en-keyword=定常流 (steady flow) kn-keyword=定常流 (steady flow) en-keyword=拍動流 (pulsatile flow) kn-keyword=拍動流 (pulsatile flow) en-keyword=透過光強度 (light transmission) kn-keyword=透過光強度 (light transmission) END start-ver=1.4 cd-journal=joma no-vol=12 cd-vols= no-issue=1 article-no= start-page=53 end-page=62 dt-received= dt-revised= dt-accepted= dt-pub-year=2001 dt-pub=20011225 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Consideration to the change of swallowing sense after operation of esophagus cancer - Evaluation of swallowing activity by using IPG and swallowing sound - kn-title=食道癌術後の嚥下感覚の変化に対する考察 ―頸部電気インピーダンスおよび嚥下音を用いた嚥下活動評価― en-subtitle= kn-subtitle= en-abstract=The esophagus cancer patient is conscious of passage disorder due to esophagus tumor, to greater or less degrees. Many of patients diagnosed as the esophagus cancer decide to take operation, because they want to come to be able to eat as easily as before they are diagnosed as esophagus cancer. However many patients encounter the change of swallowing sense. In the long run, they must swallow consciously when they eat everything. They are not informed about the change of swallowing sense. Therefore, the patient feels strong anxiety when they noticed about the change. This time, we had an interview about the change of swallowing sense after operation to the patient. In addition, we measured the swallowing activity by using IPG and swallowing sound. As a result, all patients is conscious of the change of swallowing sense. And we noticed the change of IPG wave and the swallowing sound occurred except Pharynx period. So patients want to be informed about the change of swallowing sense strongly before they take operation. And it is necessary for the patient to be informed about the change of swallowing before they take operation. kn-abstract=食道癌患者は腫瘍による狭窄のため,程度の差はあるものの,術前より通過障害を認めることが多い｡食道癌と診断され,手術を自己決定した患者の多くは,手術をして罹患前のように食事ができるようになりたいと思っている｡しかし,患者の多くが術後に嚥下感覚の変化に遭遇する｡現在,手術前に実施されるインフォームドコンセント(以下IC)では,術後に起こる嚥下感覚の変化については説明が行われていない｡そのため患者は,経口摂取が可能になった時点で嚥下感覚の変化を自覚し,強い不安を感じる｡今回, 5人の患者に術後の嚥下感覚の変化に関するインタビューを実施するとともに,術後の嚥下活動を頸部電気インピーダンスおよび嚥下音を用いて測定した｡インタビューの結果, 5人全てが,術後に嚥下感覚の変化を自覚し,不安を感じていた｡また,青年健常者と比較し,IPG波形の多相化と,嚥下音の咽頭期以外での発生が認められた｡患者が,術後に起こる嚥下感覚の変化についてのICを望んでいることからも,術後の嚥下感覚の変化についてのICを行なう必要がある｡ en-copyright= kn-copyright= en-aut-name=MoriKeiko en-aut-sei=Mori en-aut-mei=Keiko kn-aut-name=森恵子 kn-aut-sei=森 kn-aut-mei=恵子 aut-affil-num=1 ORCID= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name=山本尚武 kn-aut-sei=山本 kn-aut-mei=尚武 aut-affil-num=2 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name=中村隆夫 kn-aut-sei=中村 kn-aut-mei=隆夫 aut-affil-num=3 ORCID= en-aut-name=KusuhuraToshimasa en-aut-sei=Kusuhura en-aut-mei=Toshimasa kn-aut-name=楠原俊昌 kn-aut-sei=楠原 kn-aut-mei=俊昌 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学医学部保健学科 affil-num=2 en-affil= kn-affil=岡山大学医学部保健学科 affil-num=3 en-affil= kn-affil=岡山大学医学部保健学科 affil-num=4 en-affil= kn-affil=岡山大学医学部保健学科 en-keyword=食道癌 (esophagus cancer) kn-keyword=食道癌 (esophagus cancer) en-keyword=嚥下障害 (swallowing disorder) kn-keyword=嚥下障害 (swallowing disorder) en-keyword=生体電気インピーダンス (bioelectrical impedance) kn-keyword=生体電気インピーダンス (bioelectrical impedance) en-keyword=インフォームドコンセント (informed consent) kn-keyword=インフォームドコンセント (informed consent) END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page=282 end-page=283 dt-received= dt-revised= dt-accepted= dt-pub-year=2003 dt-pub=200310 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Evaluating object and region of concentric electrode in bio-electrical impedance measurement en-subtitle= kn-subtitle= en-abstract= kn-abstract=Concentric electrode is easy to use and used widely for measuring bio-electrical impedance. But, its evaluating region was not investigated in detail. Then, the characteristics of concentric electrode were studied from various points of view. In case of use without electrode paste, impedance is determined with the contacting condition between electrode and skin surface over all frequency range. In case of use with electrode past, impedance is composed of stratum corneum in the frequency range of 20 Hz-1 kHz and is mainly composed of subcutaneous tissue in the range of 200 kHz-1 MHz. In the high frequency range, evaluating region of concentric electrode is the area less than the radius or the gap of center electrode. en-copyright= kn-copyright= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=ShiraiKiyoko en-aut-sei=Shirai en-aut-mei=Kiyoko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=GodaNoriko en-aut-sei=Goda en-aut-mei=Noriko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=KusuharaToshimasa en-aut-sei=Kusuhara en-aut-mei=Toshimasa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=OkudaHiroyuki en-aut-sei=Okuda en-aut-mei=Hiroyuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= affil-num=1 en-affil= kn-affil=Faculty of Health Sciences, Okayama University Medical School affil-num=2 en-affil= kn-affil=Faculty of Health Sciences, Okayama University Medical School affil-num=3 en-affil= kn-affil=Faculty of Health Sciences, Okayama University Medical School affil-num=4 en-affil= kn-affil=Faculty of Health Sciences, Okayama University Medical School affil-num=5 en-affil= kn-affil=Faculty of Health Sciences, Okayama University Medical School affil-num=6 en-affil= kn-affil=Faculty of Health Sciences, Okayama University Medical School en-keyword=Bio-electrieal impedance kn-keyword=Bio-electrieal impedance en-keyword=skin impedance kn-keyword=skin impedance en-keyword=concentric electrode kn-keyword=concentric electrode en-keyword=evaluating kn-keyword=evaluating en-keyword=region kn-keyword=region END start-ver=1.4 cd-journal=joma no-vol=14 cd-vols= no-issue=1 article-no= start-page=31 end-page=35 dt-received= dt-revised= dt-accepted= dt-pub-year=2003 dt-pub=20031225 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Development of human limb volume meter for evaluation of edema kn-title=浮腫評価のための体肢容積計の開発 en-subtitle= kn-subtitle= en-abstract=Quantitative evaluation of the edema is important for perinatal medicine. In a conventional method, the volume of human limb has been estimated by 2 circumferences of the measurement position, which is measured with the tape measure. However, the following errors makes this measurement insufficient; ・the error by the way of winding of a measure to the measurement position, ・the error between volume of model geometry of measurement position and one of real shape of measurement position and so on. Then, we have developed a volume meter of human limb for the edema evaluation, which is high precision and suitable for the everyday use. Archimedes' principle was applied as this measurement principle. The mass change of water tank with water, when the measurement part water in, was converted to volume of measurement part. The linearity, resolution, stability. reproducibility of the volume meter was investigated. Considering these results, we found that the specification of this equipment was high precise as follows; maximum volume of 25,000 cm(3), resolution of 1 cm(3), nonlinearity of 0.007%. We also measured the diurnal volume change of foot and lower leg in three subjects. We found that the differences between foot and lower leg or among the subjects. The developed volume meter can be expected to apply to quantitative evaluation of the edema. kn-abstract=周産期医学にとって浮腫の定量評価は重要である｡これまでは,測定部位の2箇所の周囲長をメジャーで測り,その変化により浮腫を評価している｡また周囲長により容積を推定する方法も提案されている｡しかしながら,この方法ではメジャーの測定部位への巻き付け方による誤差や容積を推定する根拠となる測定部位のモデル形状と実際の測定部位の形状との誤差など様々な誤差の影響により,精度の点からは十分とはいえない｡そこで,本研究では浮腫評価のための高精度で日常的な使用に適した体肢容積計を開発した｡この測定原理はアルキメデスの原理を適用したもので,水を入れた水槽に測定部位を入れる前後の質量変化により,その容積を量るしくみである｡まず,この容積計の出力の線形性,分解能,安定性,再現性について検討を行った｡この結果,本装置の仕様は最大計測容積25,000cm(3),分解能1cm(3),非直線性0.007%以下となり,非常に高精度であるといえる｡また,被験者3名の足部,下腿部の容積の日内変化を測定した結果,各被験者の容積変化の特徴を明らかにすることができ,浮腫評価への応用ができることを確認した。 en-copyright= kn-copyright= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name=中村隆夫 kn-aut-sei=中村 kn-aut-mei=隆夫 aut-affil-num=1 ORCID= en-aut-name=GodaNoriko en-aut-sei=Goda en-aut-mei=Noriko kn-aut-name=合田典子 kn-aut-sei=合田 kn-aut-mei=典子 aut-affil-num=2 ORCID= en-aut-name=ShiraiKiyoko en-aut-sei=Shirai en-aut-mei=Kiyoko kn-aut-name=白井喜代子 kn-aut-sei=白井 kn-aut-mei=喜代子 aut-affil-num=3 ORCID= en-aut-name=KusuharaToshimasa en-aut-sei=Kusuhara en-aut-mei=Toshimasa kn-aut-name=楠原俊昌 kn-aut-sei=楠原 kn-aut-mei=俊昌 aut-affil-num=4 ORCID= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name=山本尚武 kn-aut-sei=山本 kn-aut-mei=尚武 aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=2 en-affil= kn-affil=岡山大学医学部保健学科看護学専攻 affil-num=3 en-affil= kn-affil=岡山大学医学部保健学科看護学専攻 affil-num=4 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=5 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 en-keyword=体肢容積計 (volume meter) kn-keyword=体肢容積計 (volume meter) en-keyword=浮腫 (edema) kn-keyword=浮腫 (edema) en-keyword=アルキメデスの原理 (Archimedes' Principle) kn-keyword=アルキメデスの原理 (Archimedes' Principle) END start-ver=1.4 cd-journal=joma no-vol=14 cd-vols= no-issue=2 article-no= start-page=135 end-page=139 dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=20040331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Development of stepping measurement device for evaluation of and training in walking kn-title=歩行能力の評価･訓練のための足踏み測定器の開発 en-subtitle= kn-subtitle= en-abstract=Although gait training equipment such as the bicycle ergometer and treadmill exists for patients whose walking ability is high, there is no appropriate gait training method or training instrument for patients whose walking ability has become impaired, who often use a cane or walker, etc. in the course of daily life. In the case of gait training for persons whose walking ability involves impaired locomotion, there is always the danger of a fall. Consequently, a caregiver is required, and the effect of the training is cut by half because the patient's anxiety about falling is exacerbated. Slow stepping affords strengthening and balance training of the leg muscles for patients whose walking ability has become low, and walking ability is improved. However, whether such training appropriately carries out stepping and the degree of the effect of such training has not been evaluated. Therefore, we have developed a stepping measurement device that monitors stepping for evaluation and training of walking ability. This system consists of two mat switches for stepping, a measuring circuit for stepping detection, and a book-sized personal computer with a PC card-type AD converter. This system can detect a left or right single stance phase and a double stance phase relative to the ON, OFF condition of the mat switch. After measurement, the following items are analyzed and displayed: ・number of steps, ・average time of double stance phase, ・the average time of single stance phase, and so on. Finally, we measured the stepping of subjects whose walking ability is low, and showed the relationship between daily walking conditions and stepping conditions. The effectiveness of this system was considered in light of the results. kn-abstract=日常生活で杖をついたり,老人車などを押したりなど歩行能力の低下した人に対する簡便･安価で効果的な歩行訓練方法,訓練機器はない｡歩行能力の低下した人が体の移動を伴う歩行訓練をする場合,常に転倒の危険性を伴うために,介護者が必要であったり,転倒の不安のために動作が消極的になり,訓練の効果が半減する｡これに対して,ゆっくりとした足踏みは歩行能力の低下した人に対しては下肢筋力の強化,バランス訓練となり,歩行能力を向上させる｡しかし,足踏みが適切におこなわれているか,訓練の効果の程度についての評価ができなかった｡そこで,歩行能力の評価･訓練のために足踏み状態をモニタすることができる足踏み測定器を開発した｡本装置は,足踏みをするマット2枚およびノートパソコンなどから構成されている｡足踏み中における両脚立脚,左右それぞれの片脚遊脚の状態をマットスイッチのON,OFF状態にて判断する｡測定後,歩数,平均両脚立脚時間,平均片肺立脚時間などの解析･表示を行う｡最後に歩行能力が低下した被験者の足踏みを測定して,杖歩行など日常の歩行状態と足踏みの状態との関係を示し,足踏み測定の有効性についても検討した｡ en-copyright= kn-copyright= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name=中村隆夫 kn-aut-sei=中村 kn-aut-mei=隆夫 aut-affil-num=1 ORCID= en-aut-name=KonishiHitoshi en-aut-sei=Konishi en-aut-mei=Hitoshi kn-aut-name=小西均 kn-aut-sei=小西 kn-aut-mei=均 aut-affil-num=2 ORCID= en-aut-name=TsujiHiroaki en-aut-sei=Tsuji en-aut-mei=Hiroaki kn-aut-name=辻博明 kn-aut-sei=辻 kn-aut-mei=博明 aut-affil-num=3 ORCID= en-aut-name=KusuharaToshimasa en-aut-sei=Kusuhara en-aut-mei=Toshimasa kn-aut-name=楠原俊昌 kn-aut-sei=楠原 kn-aut-mei=俊昌 aut-affil-num=4 ORCID= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name=山本尚武 kn-aut-sei=山本 kn-aut-mei=尚武 aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=2 en-affil= kn-affil=岡山市立せのお病院整形外科 affil-num=3 en-affil= kn-affil=岡山県立大学短期大学部健康福祉学科生活福祉専攻 affil-num=4 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=5 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 en-keyword=足踏み (stepping) kn-keyword=足踏み (stepping) en-keyword=歩行訓練 (walking training) kn-keyword=歩行訓練 (walking training) en-keyword=歩行能力 (walking ability) kn-keyword=歩行能力 (walking ability) en-keyword=高齢者 (elder people) kn-keyword=高齢者 (elder people) END start-ver=1.4 cd-journal=joma no-vol=15 cd-vols= no-issue=1 article-no= start-page=1 end-page=7 dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=20041215 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Quantitative evaluation method of swallowing hypofunctionby aging using Impedance Pharyngography (IPG) kn-title=インピーダンス咽頭図(IPG)を用いた加齢による嚥下機能減退の定量的評価法 en-subtitle= kn-subtitle= en-abstract=Impedance Pharyngography (IPG) measures neck electrical impedance during swallowing. IPG method is simple procedures and the technique which can perform noninvasive evaluation of swallowing function. IPG waveform reflects swallowing function. However, the influence on IPG waveform by swallowing hypofunction is various by the causes. That is, it will be dependent on a measurement person's subjectivity to compare directly IPG waveforms of subjects whose states of swallowing function differs, and objectivity is missing. kn-abstract=インピーダンス咽頭図(Impedance Pharyngography, 以下IPG)は嚥下活動中の頸部電気インピーダンスを測定するもので,嚥下機能評価を簡便かつ無侵襲に行うことができる手法である｡IPG波形は嚥下機能を反映するものであるが嚥下機能の減退による波形への影響はその原因により様々である｡すなわち嚥下機能の状態が異なる被験者のIPG波形を直接比較･診断することは測定者の主観に依存することになり客観性に欠ける｡本研究では,まず青年健常者のNormal IPGをもとに嚥下機能が反映される波形の特徴を評価するパラメータとして,咽頭通過時間,インピーダンス変化率,類似度,嚥下音タイミングの4つを採用し,IPCを定量的に評価する手法を提案した｡また,この評価法を高齢者のIPGに適用し,青年健常者に比べて嚥下活動に関与する器官が円滑に活動を履行する能力に減退が生じる様子を定量的に示した｡ en-copyright= kn-copyright= en-aut-name=KusuharaToshimasa en-aut-sei=Kusuhara en-aut-mei=Toshimasa kn-aut-name=楠原俊昌 kn-aut-sei=楠原 kn-aut-mei=俊昌 aut-affil-num=1 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name=中村隆夫 kn-aut-sei=中村 kn-aut-mei=隆夫 aut-affil-num=2 ORCID= en-aut-name=MoriKeiko en-aut-sei=Mori en-aut-mei=Keiko kn-aut-name=森恵子 kn-aut-sei=森 kn-aut-mei=恵子 aut-affil-num=3 ORCID= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name=山本尚武 kn-aut-sei=山本 kn-aut-mei=尚武 aut-affil-num=4 ORCID= en-aut-name=ShirakawaYasuhiro en-aut-sei=Shirakawa en-aut-mei=Yasuhiro kn-aut-name=白川靖博 kn-aut-sei=白川 kn-aut-mei=靖博 aut-affil-num=5 ORCID= en-aut-name=NaomotoYoshio en-aut-sei=Naomoto en-aut-mei=Yoshio kn-aut-name=猶本良夫 kn-aut-sei=猶本 kn-aut-mei=良夫 aut-affil-num=6 ORCID= affil-num=1 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=2 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=3 en-affil= kn-affil=岡山大学医学部保健学科看護学専攻 affil-num=4 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=5 en-affil= kn-affil=岡山大学大学院医歯学総合研究科病態制御科学専攻 affil-num=6 en-affil= kn-affil=岡山大学大学院医歯学総合研究科病態制御科学専攻 en-keyword=嚥下活動 (swallowing) kn-keyword=嚥下活動 (swallowing) en-keyword=嚥下障害 (dysphagia) kn-keyword=嚥下障害 (dysphagia) en-keyword=生体電気インピーダンス (bio-electrical impedance) kn-keyword=生体電気インピーダンス (bio-electrical impedance) en-keyword=インピーダンス咽頭図 (Impedance Pharyngography (IPG)) kn-keyword=インピーダンス咽頭図 (Impedance Pharyngography (IPG)) en-keyword=嚥下機能評価 (assessment of swallowing function) kn-keyword=嚥下機能評価 (assessment of swallowing function) END start-ver=1.4 cd-journal=joma no-vol=17 cd-vols= no-issue=1 article-no= start-page=9 end-page=15 dt-received= dt-revised= dt-accepted= dt-pub-year=2007 dt-pub=20070315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Electrical Cell-substrate Impedance Sensing (ECIS)法を用いた培養細胞の微細挙動の定量的評価法 - 細胞-細胞間隙と細胞-電極間隙の評価 - kn-title=Quantitative evaluation of micromotion of cultured cells using electrical cell-substrate impedance sensing (ECIS) method - cell-to-cell distance and cell-to-substrate distance - en-subtitle= kn-subtitle= en-abstract=[背景] Electrical Cell-substrate Impedance Sensing (ECIS)は培養細胞の電気的計測により,その微細挙動を評価する工学的手法である｡我々はECISを用いてこの微細挙動を細胞-細胞間隙と細胞-電極間隙に分離して推定することが可能な数学的モデルを提案してきた｡本研究ではこの数学的モデルを使用して,Ⅹ線を照射した牛大動脈内皮細胞(bovine aortic endothelial cell : BAEC)の微細挙動の経時変化を評価した｡ [方法と結果] ECISシステム(Model 1600R Applied BioPhysics)を用いてBAECのコンフルエント到達前後で計測を行い,数学的モデルを構築した｡このモデルは細胞の微細挙動を検出するために重要な周波数レンジである1-10kHzにおいて測定結果とよく一致し,Cole-Cole円弧則に従う｡さらに細胞-細胞間距離Aの増減に対応する校正定数S(A)と細胞-電極間距離hの増減に対応する校正定数S(h)を導入し,ベクトルインピーダンスの変化に対応した値を算出することで細胞の微細挙動を評価することとした｡次に本法によりX線(150kV, 100Gy)を照射したBAECの微細挙動を評価した｡Ⅹ線照射細胞では時間経過と共に抵抗成分の変化が支配的なインピーダンスの減少が確認された｡この現象はS(A)の大きな増加とS(h)の微小な減少をもたらした｡このパラメータの変化は細胞間隙が拡大したことを示しており,Ⅹ線照射による細胞内損傷により細胞密度が低下したと考えられた｡ [結論] 本法は培養細胞の微細動態の変化を細胞-細胞間隙と細胞-電極間隙に分けてリアルタイムに定量評価することが可能であり,各臓器の細胞レベルでの薬物の治療効果や Ⅹ線に対する耐性の評価に適応できるものと考える｡ kn-abstract=We have proposed a mathematical model for the micro-dynamics for cultured cells measured with ECIS system for the detection of nanometer-order dynamics of cells cultured on a small gold electrode and could separately evaluate cell-to-cell distance (A) and cell-to-substrate distance (h). For wide applications of this method, we constructed mathematical models which express cell-to-electrode impedances for some kinds of confluent conditions. Based on this mathematical model, we defined new parameters S(A) and S(h) in order to evaluate cell-to-cell distance and cell-to-substrate distance. As the application, we investigated the effect of X-irradiation to bovine aortic endothelial cell (BAEC). We analyzed the micro-dynamics of cells from the impedance of BAEC before and after X-irradiation. It was proved that the stimulation of 100 Gy X-irradiation to the BAEC resulted in the large scale of increase in the cell-to-cell distances (A), and the slight increase in the cell-to-substrate distances (h) accompany with continuous fluctuations. en-copyright= kn-copyright= en-aut-name=GodaNoriko en-aut-sei=Goda en-aut-mei=Noriko kn-aut-name=合田典子 kn-aut-sei=合田 kn-aut-mei=典子 aut-affil-num=1 ORCID= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name=山本尚武 kn-aut-sei=山本 kn-aut-mei=尚武 aut-affil-num=2 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name=中村隆夫 kn-aut-sei=中村 kn-aut-mei=隆夫 aut-affil-num=3 ORCID= en-aut-name=KusuharaToshimasa en-aut-sei=Kusuhara en-aut-mei=Toshimasa kn-aut-name=楠原俊昌 kn-aut-sei=楠原 kn-aut-mei=俊昌 aut-affil-num=4 ORCID= en-aut-name=MaruyamaToshinori en-aut-sei=Maruyama en-aut-mei=Toshinori kn-aut-name=丸山敏則 kn-aut-sei=丸山 kn-aut-mei=敏則 aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=岡山大学医学部保健学科 affil-num=2 en-affil= kn-affil=岡山大学医学部保健学科 affil-num=3 en-affil= kn-affil=岡山大学医学部保健学科 affil-num=4 en-affil= kn-affil=岡山大学医学部保健学科 affil-num=5 en-affil= kn-affil=岡山大学医学部保健学科 en-keyword=ECIS method (ECIS法) kn-keyword=ECIS method (ECIS法) en-keyword=bio-electrical impedance (生体インピーダンス) kn-keyword=bio-electrical impedance (生体インピーダンス) en-keyword=cultured cell modeling (細胞培養) kn-keyword=cultured cell modeling (細胞培養) en-keyword=micromotion of cultured cells (細胞微細挙動) kn-keyword=micromotion of cultured cells (細胞微細挙動) en-keyword=X-irradiation (放射線被曝) kn-keyword=X-irradiation (放射線被曝) END start-ver=1.4 cd-journal=joma no-vol=70 cd-vols= no-issue=1 article-no= start-page=53 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2020 dt-pub=20201031 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Effectiveness of impedance parameters for muscle quality evaluation in healthy men en-subtitle= kn-subtitle= en-abstract= kn-abstract=We investigated the relationship between impedance parameters and skeletal muscle function in the lower extremities, as well as the effectiveness of impedance parameters in evaluating muscle quality. Lower extremity impedance of 19 healthy men (aged 23–31 years) measured using the direct segmental multi-frequency bioelectrical impedance analysis were arc-optimized using the Cole–Cole model, following which phase angle (PA), Ri/Re, and β were estimated. Skeletal muscle function was assessed by muscle thickness, muscle intensity, and isometric knee extension force (IKEF). IKEF was positively correlated with PA (r = 0.58, p < 0.01) and β (r = 0.34, p < 0.05) was negatively correlated with Ri/Re (r = − 0.43, p < 0.01). Stepwise multiple regression analysis results revealed that PA, β, and Ri/Re were correlated with IKEF independently of muscle thickness. This study suggests that arc-optimized impedance parameters are effective for evaluating muscle quality and prediction of muscle strength. en-copyright= kn-copyright= en-aut-name=SatoHiroki en-aut-sei=Sato en-aut-mei=Hiroki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=KusuharaToshimasa en-aut-sei=Kusuhara en-aut-mei=Toshimasa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=KenichiKobara en-aut-sei=Kenichi en-aut-mei=Kobara kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=KuniyasuKatsushi en-aut-sei=Kuniyasu en-aut-mei=Katsushi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=KawashimaTakaki en-aut-sei=Kawashima en-aut-mei=Takaki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=HanayamaKozo en-aut-sei=Hanayama en-aut-mei=Kozo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= affil-num=1 en-affil=Department of Radiological Technology, Graduate School of Health Sciences, Okayama University kn-affil= affil-num=2 en-affil=Department of Radiological Technology, Graduate School of Health Sciences, Okayama University kn-affil= affil-num=3 en-affil=Department of Radiological Technology, Graduate School of Health Sciences, Okayama University kn-affil= affil-num=4 en-affil=Department of Physical Therapist, Faculty of Rehabilitation, Kawasaki University of Medical Welfare kn-affil= affil-num=5 en-affil=Department of Physical Therapist, Faculty of Rehabilitation, Kawasaki University of Medical Welfare kn-affil= affil-num=6 en-affil=Department of Physical Therapist, Kawasaki Junior College of Rehabilitation kn-affil= affil-num=7 en-affil=Department of Rehabilitation Medicine, Kawasaki Medical School, 577, Matsushim kn-affil= en-keyword=Phase angle kn-keyword=Phase angle en-keyword=Bioelectrical impedance analysis kn-keyword=Bioelectrical impedance analysis en-keyword=Cole–Cole model kn-keyword=Cole–Cole model en-keyword=Muscle quality kn-keyword=Muscle quality END start-ver=1.4 cd-journal=joma no-vol=13 cd-vols= no-issue=12 article-no= start-page=e20166 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2021 dt-pub=20211204 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Evaluation of Skeletal Muscle Dysfunction Associated With Acute Inflammation by Electrical Impedance Myography: A Case Report on Skeletal Muscle Dysfunction After Cardiac Surgery and Literature Review en-subtitle= kn-subtitle= en-abstract= kn-abstract=Electrical impedance myography (EIM) is an evaluation technique for skeletal muscles that uses electrical impedance technology. Recent reviews have shown that EIM is useful as a method to assess changes in skeletal muscle quality and quantity with aging. These may be utilized for functional changes in inflammatory skeletal muscles, such as disease and operation. In this report, the impedance parameters using EIM present perioperative skeletal muscle changes in patients after cardiac surgery. In addition, we will describe the efficacy of EIM in skeletal muscle dysfunction due to inflammation or disease. This study aimed to elucidate the efficacy of EIM in acute inflammation-associated skeletal muscle dysfunction. en-copyright= kn-copyright= en-aut-name=SatoHiroki en-aut-sei=Sato en-aut-mei=Hiroki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= affil-num=1 en-affil=Department of Radiological Technology, Graduate School of Health Sciences, Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Health Sciences, Okayama University kn-affil= en-keyword=cardiac surgery kn-keyword=cardiac surgery en-keyword=ultrasonography kn-keyword=ultrasonography en-keyword=muscle quality kn-keyword=muscle quality en-keyword=phase angle kn-keyword=phase angle en-keyword=electrical impedance myography kn-keyword=electrical impedance myography END start-ver=1.4 cd-journal=joma no-vol=11 cd-vols= no-issue= article-no= start-page=98 end-page=108 dt-received= dt-revised= dt-accepted= dt-pub-year=2022 dt-pub=2022 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Skin Electrical Impedance Model for Evaluation of the Thickness and Water Content of the Stratum Corneum en-subtitle= kn-subtitle= en-abstract= kn-abstract=Deterioration of the skin barrier function causes symptoms such as allergies because various chemical substances may enter the human body. Quantitative evaluation of the thickness and water content of the stratum corneum is useful as a measure of the skin barrier function in domains such as dermatology, nursing science, and cosmetics development. The stratum corneum is responsible for most of the skin barrier function, and two factors—the thickness and water content of the stratum corneum—are thus important. In this paper, the stratum corneum is regarded as a parallel model of resistance and capacitance. From measurements of the electrical impedance of the skin, we propose a new model for simultaneous estimation of the thickness and water content of the stratum corneum conventionally measured by a confocal laser scanning microscope and a confocal Raman spectrometer, respectively, and we discuss the results of the measurements. The electrical impedance of the skin was measured using a device that we developed. The measurement began 3 seconds after the electrodes on the measurement head of the device came into contact with the skin, and parameters including the impedance, which was obtained by applying an alternating current signal at two frequencies, were measured. We measured the thickness and water content of the stratum corneum using confocal laser microscopy and confocal Raman spectroscopy, respectively; investigated the relationship of the thickness and water content of the stratum corneum with the electrical impedance of the skin; and established a new potential model for estimating the thickness and water content of the stratum corneum from the parallel resistance and capacitance. The correlation coefficients of the verification data were 0.931 and 0.776, respectively; and the root-mean-squared error of the thickness of the stratum corneum was 2.3 µm, while the root-mean-squared error of the water content at the surface of the stratum corneum was 5.4 points. These findings indicate the feasibility of quantitative evaluation of the thickness and water content of the stratum corneum by measuring skin electrical impedance. en-copyright= kn-copyright= en-aut-name=UeharaOsamu en-aut-sei=Uehara en-aut-mei=Osamu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=KusuharaToshimasa en-aut-sei=Kusuhara en-aut-mei=Toshimasa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=MatsuzakiKenichi en-aut-sei=Matsuzaki en-aut-mei=Kenichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=YamamotoYoshitake en-aut-sei=Yamamoto en-aut-mei=Yoshitake kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=NakamuraTakao en-aut-sei=Nakamura en-aut-mei=Takao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= affil-num=1 en-affil=Medical Engineering Laboratory, ALCARE CO., Ltd. kn-affil= affil-num=2 en-affil=Department of Radiological Technology, Graduate School of Health Sciences, Okayama University kn-affil= affil-num=3 en-affil=Medical Engineering Laboratory, ALCARE CO., Ltd. kn-affil= affil-num=4 en-affil=Okayama University kn-affil= affil-num=5 en-affil=Department of Radiological Technology, Graduate School of Health Sciences, Okayama University kn-affil= en-keyword=skin electrical impedance kn-keyword=skin electrical impedance en-keyword=thickness kn-keyword=thickness en-keyword=water content kn-keyword=water content en-keyword=stratum corneum kn-keyword=stratum corneum en-keyword=skin barrier kn-keyword=skin barrier END