| Summary: | 碩士 === 國立體育大學 === 競技與教練科學研究所 === 101 === Deep Squat test is used to observe whole body mobility and stability of athletes. Investigating the differences between compensation types of deep squat could help us to understand the factors that influenced deep squat patterns. 11 archers (trunk neutral group: 6; trunk forward group: 5) were included in current study. The purpose of this study was comparing the differences of joint mobility, muscle flexibility, and muscle strength between two groups. Muscle activation level during different deep squat phase (pre-downward, downward acceleration, downward deceleration, downward stable, pre-upward, upward acceleration, upward deceleration, upward stable) was also compared in this study. Results showed that there were no joint mobility, muscle flexibility, muscle strength differences between trunk neutral group and trunk forward group. Trunk neutral group have higher activation level than trunk forward group in knee extensors (rectus femoris, vastus medialis) during upward acceleration and upward deceleration, knee flexor (semitendinosus) during downward deceleration, and ankle plantar-flexor (soleus) during downward deceleration. No differences between two groups in joint mobility, muscle flexibility, and muscle strength indicated that they might not the main factors that influenced deep squat patterns. Higher knee extensor activation level in trunk neutral group indicated higher extension torque load in this position. Co-activation of knee flexors was occurred to maintain knee stability. Higher ankle plantar-flexor activation level in trunk neutral group indicated ankle stability for balance control. The current study suggested that improved joint mobility, muscle flexibility, and muscle strength might not the main strategy to correct trunk position during deep squat. Neuromuscular control training that could improve knee and ankle stability might be more efficiency to upgrade trunk performance during deep squat.
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