Influence of forward head posture on scapular upward rotators during isometric shoulder flexion

Jong Hyuck Weon, Jae Seop Oh, Heon Seock Cynn, Yong Wook Kim, Oh Yun Kwon, Chung Hwi Yi

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

We assessed the effects of forward head posture in the sitting position on the activity of the scapular upward rotators during loaded isometric shoulder flexion in the sagittal plane.Healthy volunteers (n=21; 11 men, 10 women) with no history of pathology participated in the study. Subjects were instructed to perform isometric shoulder flexion with the right upper extremity in both the forward head posture (FHP) and neutral head posture (NHP) while sitting. Surface electromyography (EMG) was recorded from the upper trapezius, lower trapezius, and serratus anterior muscles. Dependent variables were examined by 2 (posture) × 3 (muscle) repeated measures analysis of variance. Significantly increased EMG activity in the upper trapezius and lower trapezius and significantly decreased EMG activity in the serratus anterior were found during loaded isometric shoulder flexion with FHP. Thus, FHP may contribute to work-related neck and shoulder pain during loaded shoulder flexion while sitting.These results suggest that maintaining NHP is advantageous in reducing sustained upper and lower trapezius activity and enhancing serratus anterior activity as compared with FHP during loaded shoulder flexion.

Original languageEnglish
Pages (from-to)367-374
Number of pages8
JournalJournal of Bodywork and Movement Therapies
Volume14
Issue number4
DOIs
Publication statusPublished - 2010 Oct 1

All Science Journal Classification (ASJC) codes

  • Complementary and Manual Therapy
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation
  • Complementary and alternative medicine

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