目的 研究踝关节外固定防护在模拟半蹲式跳伞着陆中对下肢肌电（Electromyogram, EMG）活动性的影响及其性别差异。方法 男女各8名健康成人受试者从0.72 m高平台跳落，模拟半蹲式跳伞着陆。实验状态分赤足对照、佩戴护踝和绷带3组。测量其胫骨前肌、外侧腓肠肌、股直肌和股二头肌的肌电图。使用二因素方差分析评价防护和性别对EMG参数的影响。结果 使用护踝显著增加男性胫骨前肌触地前EMG幅值（赤足对照：266 μV；绷带：368 μV；护踝：552 μV），防护对其他EMG参数无显著性影响。结论 使用护踝仅对男性跳伞者有显著的防护作用；踝关节防护对膝关节EMG活动性无显著性影响。

Objective To study effects of ankle stabilizer on electromyographic activities of lowerextremity muscles during the simulated halfsquat parachute landing and its gender differences. Method Eight male and eight female healthy adults were required to jump from a platform of 0.72 m high to simulate halfsquat parachute landing. The experiment was divided into 3 groups: the barefoot one as control group, the group wearing tapes and braces respectively. The electromyogram (EMG) of each subject’s tibial anterior, lateral gastrocnemius, biceps femoralis and rectus femoralis was measured. Twoway ANOVA was used to analyze and evaluate the effect of the stabilizers and genders on EMG variables. Results The use of brace significantly increased the prelanding EMG amplitude of the tibialis anterior for male (Control: 266 μV; Tape: 368 μV; Brace: 552 μV). The stabilizers had no significant effects on the other EMG parameters. Conclusions Semirigid ankle braces are capable of arousing more active EMG of male’s ankle flexor during halfsquat parachute landing, but female does not share this predominance. Ankle stabilizers have no significant effects on EMG activities for knee joints.

国家自然科学基金资助项（10925208），国家重点实验室开放基金，中央高校基本科研业务费专项