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Effects of Reciprocal Inhibition Using Thera-band on Scapular Muscle Activities During Arm-lifting Exercises in Subjects with Rounded Shoulder Posture

대한물리의학회지 2020년 15권 3호 p.11 ~ 20
이치훈, 신헌석, 신아름, 이지현,
소속 상세정보
이치훈 ( Lee Chi-Hun ) - Yonsei University Graduate School Department of Physical Therapy
신헌석 ( Cynn Heon-Seock ) - Yonsei University Graduate School Department of Physical Therapy
신아름 ( Shin A-Reum ) - Yonsei University Graduate School Department of Physical Therapy
이지현 ( Lee Ji-Hyun ) - Baekseok University Department of Physical Therapy

Abstract


PURPOSE: Excessive activity of the upper trapezius (UT) muscle contributes to a rounded shoulder posture (RSP) through abnormal rotation of the scapula that weakens the lower trapezius (LT) and serratus anterior (SA) muscles. This study compared the effects of two arm-lifting exercises with and without the use of a Thera-band on the activities of LT, SA, and UT muscles, and the LT/UT and SA/UT activity ratio in subjects with a rounded shoulder posture.

METHODS: Sixteen subjects with RSP participated in this study. All subjects performed arm-lifting (AL), diagonal arm-lifting (DAL), arm lifting with isometric adduction (ALIA), and diagonal arm-lifting with isometric adduction (DALIA) exercises. The surface electromyography data, LT, SA, UT, and the LT/UT and SA/UT activity ratios were measured. A paired t-test was used to compare the differences between two arm-lifting exercises and two arm lifting with isometric adduction exercises.

RESULTS: In ALIA and DALIA exercises, the UT muscle activity decreased significantly, whereas the LT/UT, SA/UT activity ratio increased significantly. The activity of SA muscle increased significantly more with DALIA than that with DAL.

CONCLUSION: Arm-lifting exercises using a Thera-band can be implemented as an effective way to reduce the UT overactivity and increase the SA activity and LT/UT, SA/UT activity ratio in subjects with RSP.

키워드

Upper trapezius; Reciprocal inhibition; Serratus anterior; Lower trapezius

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