Date: 3/27/2018 The Effects of Scapular Muscle Fatigue on Scapular Sensorimotor System Author: Guo-Fong Luo Adviser: Yi-Fen Shih, Ph.D.
Study Protocol Objective: To investigate the effect of scapular muscle fatigue on scapulothoracic joint position sense and neuromuscular performance. Design: Cross-sectional study design Methods: We recruited 30 healthy adults (15 males and 15 females aged 23.6 ±1.8 years old in average) for the study. They received the measurements of scapulothoracic joint position sense (reposition error) during the elevation and protraction tasks, muscle strength, and scapular kinematics and muscle activation (amplitude and recruitment timing) during scaption (arm elevation in scapular plane) before and after a fatigue protocol. Our fatigue protocol was a task designed to exhaust scapular muscles including upper, lower trapezius, and serratus anterior. The task required the participants holding the modified push-up plus position for two (female) or three (male) minutes for five to ten repetitions or until they could only longer hold the position. The repeated measured analysis of variance (ANOVA) was used to assess the effects of fatigue on scapular reposition errors, muscle strength, scapular kinematics, muscle activation, and recruitment timing. The level of statistical significance was set at P < 0.05. l l l Statistical Analysis Plan lTwo-way repeated measures analysis of variance (ANOVA) for kinematics data and muscle activation during scaption ? lStatistical significance for all comparisons at P < .05, and adjusted to 0.00625 and 0.0083 using Bonferroni method for post separate ?one-way repeated measures analysis of variance ? 2