Journal of the Society of Biomechanisms
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Volume 38, Issue 2
Displaying 1-11 of 11 articles from this issue
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  • Reliability and Validity of Posterior Peak Method Using Trunk Acceleration during Gait in Post-stoke Hemiplegic Patients
    Yoshitaka OTANI, Osamu AOKI, Yuri INOUE, Masayuki UESUGI, Masahito MUR ...
    2014 Volume 38 Issue 2 Pages 135-142
    Published: 2014
    Released on J-STAGE: April 16, 2016
    DOIhttps://doi.org/10.3951/sobim.38.135
    JOURNAL FREE ACCESS
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    Determination of heel contact from the anterior-posterior component of acceleration is needed in gait analysis using a tri-axis accelerometer. However, detection of acceleration waveform consistent with heel contact during gait is difficult in post-stroke hemiplegic patients. The study aimed to investigate the effectiveness of the posterior peak detection method for extracting temporal parameter. The results obtained were highly reliable (Intra-class Correlation Coefficient = 0.97) and validity (r = 0.99, p < 0.01). Therefore, the posterior peak detection method could be a useful method to extract the temporal parameter.
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  • A musculoskeletal model-based estimation of shoulder muscle forces during the abduction of the upper arm in case of rotator cuff tears.
    Naoki KINOSHITA, Toyohiko HAYASHI, Hiroshi TANAKA, Hiroki NINOMIYA, Ma ...
    2014 Volume 38 Issue 2 Pages 143-149
    Published: 2014
    Released on J-STAGE: April 16, 2016
    DOIhttps://doi.org/10.3951/sobim.38.143
    JOURNAL FREE ACCESS
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    Rotator cuff tear is one of the typical muscle disorders of the shoulder, which is believed to modify forces of the shoulder muscles. Such modification in muscle force, however, has yet to be clarified. Then, its detailed analysis is strongly required in clinic. The purpose of this study is to estimate the muscle forces of the shoulder with and without rotator cuff tear by means of a musculoskeletal model of the shoulder. The model consists of three different components as fellow: 1) bone models including humerus, scapula and clavicle; 2) muscle models simulating eight different shoulder muscles; and 3) a 6-degree-of-freedom motion model of the abduction of the upper arm within the scapular plane. We prepared eight different abnormal shoulder models with infraspinatus and/or supraspinatus tears and a normal shoulder model without tears. Consequently, muscle forces of the anterior and intermediate portions of the deltoid increased, while that of the subscapularis decreased in the shoulder models including a lot of tears, resulting in the decrease of the impedance about the glenohumeral joint. These simulation results coincided well with clinical observations.
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