著者

遠藤 泰弘 Yasuhiro Endo 松山大学法学部 Matsuyama University Faculty of Law

雑誌

松山大学論集 = Matsuyama University review (ISSN:09163298)

巻号頁・発行日

vol.24, no.1, pp.123-143, 2012-04-01

著者

Daisuke Uga Yasuhiro Endo Rie Nakazawa Masaaki Sakamoto

出版者

理学療法科学学会

雑誌

Journal of Physical Therapy Science (ISSN:09155287)

巻号頁・発行日

vol.28, no.1, pp.154-158, 2016 (Released:2016-01-30)

参考文献数

19

被引用文献数

2 8

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[Purpose] This study aimed to clarify activation of the infraspinatus and scapular stabilizing muscles during shoulder external rotation at various shoulder elevation angles. [Subjects] Twenty subjects participated in this study and all measurements were performed on the right shoulder. [Methods] Isometric shoulder external rotation strength and surface electromyographic data were measured with the shoulder at 0°, 45°, 90°, and 135° elevation in the scapular plane. The electromyographic data were collected from the infraspinatus, upper trapezius, middle trapezius, lower trapezius, and serratus anterior muscles. These measurements were compared across the various shoulder elevation angles. [Results] The strength measurements did not differ significantly by angulation. The infraspinatus activity was 92%, 75%, 68%, and 57% of the maximum voluntary contraction, which significantly decreased as shoulder elevation increased. The serratus anterior activity was 24%, 48%, 53%, and 62% of the maximum voluntary contraction, which significantly increased as shoulder elevation increased. [Conclusion] Shoulder external rotation torque was maintained regardless of shoulder elevation angle. The shoulder approximated to the zero position as the shoulder elevation increased so that infraspinatus activity decreased and the scapular posterior tilting by the serratus anterior might generate shoulder external rotation torque.

著者

Yasuhiro Endo Masaaki Sakamoto

出版者

理学療法科学学会

雑誌

Journal of Physical Therapy Science (ISSN:09155287)

巻号頁・発行日

vol.26, no.5, pp.689-693, 2014 (Released:2014-05-29)

参考文献数

19

被引用文献数

4 55

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[Purpose] The present study longitudinally investigated injury occurrences and the risk factors for muscle tightness, core stability, and dynamic standing balance among junior high school student baseball players. [Subjects] Thirty-nine male students, belonging to baseball clubs at 2 junior high schools, participated in this study. [Methods] Study measurements were obtained twice, once in the early stage of the baseball season (March) and once at the end of the season (July). All subjects underwent muscle tightness testing, the Star Excursion Balance Test (SEBT), and trunk endurance testing during each measurement session. [Results] Fifteen players experienced episodes of elbow or shoulder pain while throwing. Players in the pain group demonstrated a significant increase in the tightness of their shoulder internal rotators, axis-leg quadriceps, and axis-leg hamstrings. There was no clear evidence of differences of changes in core stability and dynamic standing balance between the groups. [Conclusion] The results of this study suggest that lower extremity muscle tightness early in a season and the subsequent decline in the flexibility of the axis-leg quadriceps and hamstrings during the season may be due to an increased upper extremity load while throwing, thus producing shoulder and elbow pain.

著者

Rie Nakazawa Yasuhiro Endo Masaaki Sakamoto

出版者

理学療法科学学会

雑誌

Journal of Physical Therapy Science (ISSN:09155287)

巻号頁・発行日

vol.25, no.7, pp.775-777, 2013 (Released:2013-08-20)

参考文献数

12

被引用文献数

2 2

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[Purpose] The purpose of this study was to examine the relationship between trunk stability and injury among young soccer players. [Subjects and Methods] The subjects were 19 male soccer players in junior high school. The presence of injury was noted, and trunk stability was measured by using the bench test and sideways bench test, which were modified from “The 11+” exercises. [Results] There was no significant difference in endurance time in the bench test or sideways bench test between the injury group (n=9) and non-injury group (n=10). Comparison within each group revealed no significant difference in endurance time between the right and left sideways bench tests in the non-injury group; however, the time in the left sideways bench test was significantly longer than that in the right in the injury group. [Conclusion] This study suggests that there is a relationship between asymmetric trunk stability and injury. Further research investigating the relationship between asymmetric trunk function and balance skills is necessary.