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Effects of soft tissue mobilization techniques on neuromotor control and stiffness in hamstring shortness

Other Titles
 연부조직 가동술이 넙다리뒤근 활성도 및 스티프니스에 미치는 영향 
Issue Date
Dept. of Physical Therapy/석사
The purpose of this study was to compare the effects of soft tissue mobilization (STM) techniques on improving quadriceps and hamstring muscle electromyographic (EMG) activity ratio, torque ratio, active knee extension range of motion (ROM), and knee joint passive stiffness. Forty-five subjects (21 males and 24 females) with hamstring tightness participated in this study. The subjects were assigned randomly to each of the three soft tissue mobilization technique groups [instrument-assisted soft tissue mobilization (IASTM), hold-relax (HR), and strain-counterstrain (SCS)]. Subjects with hamstring tightness have limited active knee extension test (more than 20°). Surface EMG was utilized to collect the quadriceps and hamstring muscle activity and Biodex System Isokinetic Dynamometer was used to measure muscle torque and knee joint passive stiffness during knee extension and flexion. One-way analyses of variance were used to determine the statistical significance of the quadriceps and hamstring EMG activity and torque ratios, knee joint passive stiffness, and active knee extension ROM in each technique. The significance level was set at α=0.05. The quadriceps and hamstring EMG activity and torque ratios were significantly increased in IASTM compared to HR, and SCS. Whereas knee joint passive stiffness was significantly reduced in IASTM compared to HR and SCS. Therefore, the results of this study suggest that IASTM technique may have improved knee joint neuromuscular imbalance and knee joint passive stiffness by restoring proper reciprocal inhibition between the quadriceps and hamstring in subjects with hamstring tightness.
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