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The Correlation of the Area of the Base of Support with the Maximal Voluntary Isometric Contraction of Upper Limb Muscles

기저면의 넓이와 상지 근육의 최대 수의적 등척성 수축의 상관관계

  • Lee, Sang-Yeol (Department of Physical Therapy, Kyungsung University) ;
  • Jo, Marg-Eun (Department of Physical Therapy Busan Saint Mary's Hospital)
  • 이상열 (경성대학교 물리치료학과) ;
  • 조맑은 (부산성모병원물리치료실)
  • Received : 2016.04.20
  • Accepted : 2016.04.29
  • Published : 2016.04.30

Abstract

Purpose: The purpose of the present study was to examine the effects of the area of the base of support formed by the human body on the maximal voluntary isometric contraction of upper limb muscles. Methods: The study was conducted with 20 normal adults. To identify changes in the base of support, the maximal voluntary isometric contraction of the biceps muscle was measured in a standing position, a sitting position, and a lying position for each subject. The sizes of the base of support formed in the standing, sitting, and lying positions were set to 1, 2, and 3 respectively, based on the sizes, to analyze the correlations. The maximal voluntary isometric contraction of the biceps muscle was measured using surface electromyograms (EMGs) (Noraxon DTS, Germany). Results: The results showed negative correlations in which, as the size of the base of support increased, the maximal voluntary isometric contraction of the biceps muscle decreased. Conclusion: Changes in the base of support of the body affect the maximal voluntary isometric contraction of the upper limbs. Therefore, when resistance exercises are applied for muscle strengthening, the positions should be changed considering the changes in muscle activity according to those positions. In addition, when EMGs are used to measure the maximal voluntary isometric contraction, the measurements should be conducted in the same positions, considering muscle activity that changes according to the base of support and positions, for data quantification.

Keywords

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