PNF and Movement

Korea Proprioceptive Neuromuscular Facilitation Association (대한고유수용성신경근촉진법학회)
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Comparison of Muscle Activities between the Diagonal Pattern of Shoulder Exercises Using the %Normalization and %Isolation Method

독립화 비율과 정량화 비율을 사용한 대각선 패턴의 어깨운동 간의 근활성도 비교

  • Sang-Yeol Lee (Department of Physical Therapy, Kyungsung University) ;
  • Se-Yeon Park (Department of Physical Therapy, Uiduk University)
  • 이상열 (경성대학교 물리치료학과) ;
  • 박세연 (위덕대학교 물리치료학과)
  • Received : 2023.02.25
  • Accepted : 2023.03.24
  • Published : 2023.04.30
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Abstract

Purpose: The present study aims to investigate the effects of a diagonal exercise pattern on selective activation of the upper extremity muscles using both normalization and isolation methods. Methods: In total, 17 asymptomatic subjects participated in this study. During the two diagonal patterns of exercise (diagonals 1 and 2), muscular activities of the upper trapezius (UT), lower trapezius (LT), serratus anterior (SA), anterior deltoid (AD), and infraspinatus (IS) were measured. The collected data were analyzed in two ways, according to the dominance of muscle activities (%Isolation) and according to normalized activities (%MVIC). Results: There were significant differences in LT, SA, AD, and IS between %MVIC and %Isolation (p<0.05), and the diagonal 1 pattern of exercise showed significantly more LT activities compared with the diagonal 2 pattern (p<0.05). Further, except for LT, there were no significant differences in muscle activities between the diagonal 1 and 2 exercises. Conclusion: The present study suggests that a diagonal pattern of exercise is advantageous for strengthening shoulder muscles, but caution is needed when applying to patients requiring selective strengthening. Regarding both the concentric and eccentric phases of exercise, there was no significant difference in muscular activation, except in LT, between the two diagonal patterns of exercises.

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