Uchiyama, Takanori

写真a

Affiliation

Faculty of Science and Technology, Department of Applied Physics and Physico-Informatics (Yagami)

Position

Professor

Related Websites

External Links

Career 【 Display / hide

  • 1992.04
    -
    1997.03

    神戸大学工学部, 助手

  • 1997.04
    -
    1998.03

    慶應義塾大学理工学部, 助手

  • 1998.04
    -
    2003.03

    慶應義塾大学理工学部, 専任講師

  • 2003.04
    -
    2007.03

    慶應義塾大学理工学部, 助教授

  • 2007.04
    -
    2011.03

    慶應義塾大学理工学部, 准教授

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Academic Background 【 Display / hide

  • 1987.03

    Keio University, Faculty of Science and Engineering, 計測工学科

    University, Graduated

  • 1989.03

    Keio University, Graduate School, Division of Science and Engineeri, 計測工学専攻

    Graduate School, Completed, Master's course

  • 1992.03

    Keio University, Graduate School, Division of Science and Engineeri, 生体医工学専攻

    Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide

  • PhD, Keio University, 1992.03

 

Research Areas 【 Display / hide

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Measurement engineering

  • Life Science / Biomedical engineering

  • Life Science / Biomaterials

Research Keywords 【 Display / hide

  • 生体計測

  • 筋電図

  • 筋音図

Research Themes 【 Display / hide

  • 床反力計測による筋と関節の粘弾性推定, 

    2017.04
    -
    Present

  • System identification of mechanomyogram, 

    2005
    -
    Present

 

Books 【 Display / hide

  • 筋肉研究最前線

    森谷 敏夫 他, NTS, 2019.09,  Page: 310

    Scope: 第6章 第4節 押し込み反力計測による筋硬度評価法の検討,  Contact page: 245-253

  • 生体システム工学の基礎

    FUKUOKA YUTAKA, UCHIYAMA TAKANORI, NOMURA TAISHIN, コロナ社, 2015.04

    Scope: 第4章

  • 日本語LaTeX2eインストールキット

    中野賢,淺山和典,内山孝憲, アスキー, 1997.11

     View Summary

    科学技術論文向け日本語組版ソフトウエア日本語LaTeX2eの解説書

Papers 【 Display / hide

  • Relationships among electromyogram, displacement and velocity of the center of pressure, and muscle stiffness of the medial gastrocnemius muscle during quiet standing

    Uchiyama T., Kondo G.

    Advanced Biomedical Engineering (Advanced Biomedical Engineering)  9   138 - 145 2020.08

    Research paper (scientific journal), Joint Work, Accepted

     View Summary

    © 2020 The Author(s). Medial gastrocnemius muscle stiffness was estimated using a system identification technique. The medial gastrocnemius muscle was electrically stimulated using surface Ag-AgCl electrodes and the center of pressure fluctuation in the forward-backward direction was measured with a force plate. Electrically induced fluctuation of the center of pressure was classified according to the displacement and velocity of the center of pressure. The classified steps of displacement and velocity were 0.2 cm and 0.2 cm/s, respectively. The ranges of the classes were ±0.15 cm and ±0.15 cm/s. The classified fluctuations were synchronously averaged and the averaged fluctuation was regarded as an output signal of the transfer function from the electrical stimulation to the fluctuation. The transfer function was identified as an estimate of muscle stiffness using a singular value de-composition method. The average muscle stiffness of eight young male participants ranged from 56.7 to 75.9 N/m. Muscle stiffness was high when the displacement of the center of pressure was positive and the velocity was negative. These characteristics resembled the preceding 0.3 s of the electromyogram. This preceding high muscle activity probably contributed to muscle stiffness. Muscle stiffness was well approximated with a multiple linear regression plane, in which the explanatory variables were the displacement and velocity of the center of pressure.

  • Accurate natural frequency estimation method for myotonometer using a system identification method

    Uchiyama T., Ogura Y.

    Transactions of Japanese Society for Medical and Biological Engineering (Transactions of Japanese Society for Medical and Biological Engineering)  58 ( Proc ) 598 - 599 2020

    ISSN  18814379

     View Summary

    The purpose of this study is to propose a novel method to estimate natural frequency using a myotonometer with the aid of a system identification technique. A myotonometer is an instrument that measures muscle hardness based on an indentation method. We utilized a MyotonPRO (Myoton AS, Tallinn, Estonia) as a myotonometer. The myotonometer applies a mechanical rectangular pulse to an object and records the acceleration of the indenter. The built-in program of the myotonometer calculates the natural frequency of the object from the recorded acceleration with fast Fourier transformation. This calculation, however, showed the dependency of the natural frequency on the rectangular pulse width. To overcome the dependency, we propose a novel technique to estimate the natural frequency. Our proposed method extracted the acceleration that was not affected by the rectangular mechanical pulse. Then the extracted acceleration was regarded as an output of a system from the mechanical pulse to the acceleration. The transfer function of the system was identified, and then the natural frequency of the transfer function was calculated. We applied the proposed method to the estimation of the natural frequency of a gel-like object mimicking human soft tissue. The proposed method provided a smaller standard deviation of the natural frequency than the built-in program of the myotonometer.

  • Relationship between medial gastrocnemius muscle stiffness and the angle between the rearfoot and floor

    Uchiyama T., Hamada E.

    Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS (Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS)     6860 - 6863 2019.07

    ISSN  9781538613115

     View Summary

    © 2019 IEEE. The present study examined the stiffness in the medial gastrocnemius muscle at various angles between the rearfoot and the floor. Six healthy young men participated in the study. A triangle support was attached to the force plate. Each participant placed their forefoot and rearfoot onto the force plate and the triangle support, respectively. Electrical stimulation was applied to the medial gastrocnemius muscle using Ag-AgCl surface electrodes. The center of pressure was measured with the force plate, and electrically-induced fluctuation of the center of pressure was extracted using a Kalman filter. Measurements were performed at 10°, 20°, and 30°angles of the triangle support. The transfer function from the stimulation to the fluctuation was identified, and the poles of the transfer function were used to estimate the medial gastrocnemius muscle and ankle stiffness. The muscle stiffness increased as the angle of the triangle support increased.

  • Optimum displacement of muscle in relation to thickness for biceps brachii hardness measurement using a push-in meter

    MITSUYOSHI MURAYAMA, TAKAYUKI INAMI, NORIHIRO SHIMA, KAZUNORI NOSAKA, UCHIYAMA TAKANORI, TSUGUTAKE YONEDA

    Biomedical Physics & Engineering Express (IOP Publishing)  5 ( 1 ) 017001 2018.11

    Research paper (scientific journal), Joint Work, Accepted

     View Summary

    © 2018 IOP Publishing Ltd. Objective: Muscle hardness measured by a push-in meter is calculated from a force-displacement curve (FDC) based on a two-layer spring model. Since a FDC is not linear, how to set a linear range in the FDC largely affects muscle hardness calculation. The present study investigated the linearity of the FDC to find the best portion relative to muscle thickness (MT) for muscle hardness measurement based on a two-layer spring model. Approach: Forty-seven men (age: 28 ±10 years, height: 176 ±7 cm, body mass: 73 ±11 kg) participated in the present study. Hardness of the biceps brachii muscle was measured at the mid-belly using a push-in meter. The FDC was obtained every 5% up to 50% of the MT, and linear regression equations of ten different portions within the FDC were calculated. The coefficient of determination (R 2 ) of each regression line was compared by ANOVA, and a piecewise linear regression analysis was performed by dividing the identified FDC into three linear segments. Results: One-way ANOVA showed a significant (p < 0.01) main effect in R 2 values of ten regression equations. Post-hoc analyses showed no significant differences in R 2 between 0%-15% MT and 0%-40% MT. While the linearity of the FDC was high between 0%-15% and 0%-40% MT, the highest R 2 value was found at 0%-25% and 0%-30% MT. According to the analysis of three linear segments in the FDC, the mean value of the point between the second and third segments was 28.5 ±4.3% MT. Significance: These results suggested that muscle hardness assessment using a push-in meter should be performed close to 30% MT depth for biceps brachii muscle.

  • Stiffness and viscosity of the vastus lateralis muscle in cycling exercises at low constant power output

    UCHIYAMA TAKANORI/KAITO SAITO

    Advanced Biomedical Engineering (Advanced Biomedical Engineering)  7   124 - 130 2018.06

    Research paper (scientific journal), Joint Work, Accepted

     View Summary

    © 2018, Japanese Society for Medical and Biological Engineering. All rights reserved. We examined muscle stiffness at various pedaling rates under conditions of constant power output. Eight healthy young participants pedaled a cycle ergometer at a power output of 47 W. The combinations of pedaling rate and workload were 40 revolutions per min (rpm) and 11.7 N, 60 rpm and 7.8 N, and 80 rpm and 5.9 N, respectively. One electrical stimulus per two pedal rotations was applied to the vastus lateralis muscle at a crank angle of 30° in the down phase. Mechanomyograms (MMGs) were measured using a capacitor microphone, and the evoked MMG was extracted. An evoked MMG system was identified, and the coefficients of the denominator of the transfer function were used to estimate stiffness and viscous coefficient of the muscle. Muscle stiffness was 236–705 Nm−1, and was proportional to the pedaling rate when power output was held constant, while the viscous coefficient did not change from approximately 15 Nm−1s. In conclusion, our findings demonstrate that stiffness of the vastus lateralis muscle increases with increasing pedaling rate under conditions of constant power output, while the viscous coefficient does not change.

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Papers, etc., Registered in KOARA 【 Display / hide

Reviews, Commentaries, etc. 【 Display / hide

  • 押し込み型の硬度計

    UCHIYAMA TAKANORI/NAGAOKA MANABU

    バイオメカニズム学会誌 40 ( 2 ) 92 - 102 2016.05

    Article, review, commentary, editorial, etc. (scientific journal), Joint Work

Presentations 【 Display / hide

  • Stiffness of the gastrocnemius muscle and ankle joint under a cooling condition

    Takanori Uchiyama, Hirotaka Muto, Dai Urushido

    日本生体医工学会大会2022 (新潟コンベンションセンター) , 

    2022.06

    Poster presentation, 日本生体医工学会

  • Relationship between the center of pressure and thickness of the tibialis anterior muscle during quiet standing

    Kengo Aoki, Takanori Uchiyama

    日本生体医工学会大会2022 (新潟コンベンションセンター) , 

    2022.06

    Oral presentation (general), 日本生体医工学会

  • Identification of the transfer function from electromyogram to force in voluntary contraction of the abductor digiti minimi m

    Naofumi Oyai, Takanori Uchiyama

    日本生体医工学会大会2022 (新潟コンベンションセンター) , 

    2022.06

    Oral presentation (general), 日本生体医工学会

  • Estimation of knee joint natural frequency during quiet standing

    Takanori Uchiyama, Masakiyo Oda

    IUPESM World Congress of Medical Physics and Biomedical Engineering (シンガポール) , 

    2022.06

    Poster presentation

  • Relationship between the position andvelocity of the center of pressure andstiffness of the tibialis anterior muscleduring quiet standing

    Kengo Aoki, Takanori Uchiyama

    生体医工学シンポジウム2021, 

    2021.09

    Poster presentation

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Research Projects of Competitive Funds, etc. 【 Display / hide

  • Stiffness estimation of ankle joint and leg muscles during quiet standing

    2019.04
    -
    2022.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

  • Control mechanisum of muscle stiffness and viscosity in walking

    2015.04
    -
    2018.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

Awards 【 Display / hide

  • 2016年度計測自動制御学会著述賞

    福岡豊/内山孝憲/野村泰伸, 2016.09, 公益社団法人計測自動制御学会, 生体システム工学の基礎

    Type of Award: Award from Japanese society, conference, symposium, etc.

  • 2016年度計測自動制御学会論文賞

    Takanori Uchiyama/Takahiro Tamura, 2016.09, 公益社団法人計測自動制御学会, System Identification of Mechanomyogram at Various Levels of Motor Unit Recruitment

    Type of Award: Award from Japanese society, conference, symposium, etc.

  • 科学新聞賞

    内山 孝憲, 1998.05

  • 日本ME学会 論文賞阪本賞

    内山 孝憲, 1998.05, 日本ME学会

  • バイオメカニズム学会 奨励賞

    内山 孝憲, 1997.11, バイオメカニズム学会

 

Courses Taught 【 Display / hide

  • MEASURMENT AND CONTROL IN BIOMEDICAL ENGINEERING

    2022

  • MATHEMATICS FOR APPLIED PHYSICS (B)

    2022

  • INDEPENDENT STUDY ON FUNDAMENTAL SCIENCE AND TECHNOLOGY

    2022

  • GRADUATE RESEARCH ON FUNDAMENTAL SCIENCE AND TECHNOLOGY 2

    2022

  • GRADUATE RESEARCH ON FUNDAMENTAL SCIENCE AND TECHNOLOGY 1

    2022

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Courses Previously Taught 【 Display / hide

  • 物理情報工学実験CD

    Keio University

    2018.04
    -
    2019.03

    Autumn Semester, Laboratory work/practical work/exercise, Within own faculty

  • バイオシステム

    Keio University

    2018.04
    -
    2019.03

    Autumn Semester, Lecture

  • 生体制御

    Keio University

    2018.04
    -
    2019.03

    Spring Semester, Lecture, Within own faculty

  • デジタル基礎

    Keio University

    2018.04
    -
    2019.03

    Spring Semester, Lecture, Within own faculty

    論理回路

  • 物理情報数学B

    Keio University

    2018.04
    -
    2019.03

    Spring Semester, Lecture, Within own faculty

    線形代数

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Social Activities 【 Display / hide

  • 医療機器センター

    2006.07
    -
    2012.03

Memberships in Academic Societies 【 Display / hide

  • 電子情報通信学会, 

    2006.11
    -
    Present
  • IEEE, 

    1996.06
    -
    Present
  • 電気学会, 

    1996.04
    -
    Present
  • バイオメカニズム学会, 

    1995.05
    -
    Present
  • 日本機械学会, 

    1994.06
    -
    2021.12

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Committee Experiences 【 Display / hide

  • 2018.04
    -
    2020.03

    評議員, バイオメカニズム学会

  • 2018.03
    -
    2021.02

    論文集委員会委員, 計測自動制御学会

  • 2017.04
    -
    2018.03

    編集委員会副委員長, バイオメカニズム学会

  • 2016.09
    -
    Present

    編集委員会委員, 日本生体医工学会

  • 2016.04
    -
    2016.09

    プログラム委員,co-editor, 生体医工学シンポジウム2016

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