Objective To study effects of ankle stabilizer on electromyographic activities of lowerextremity muscles during the simulated halfsquat 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 halfsquat 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. Twoway 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 prelanding 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 Semirigid ankle braces are capable of arousing more active EMG of male’s ankle flexor during halfsquat parachute landing, but female does not share this predominance. Ankle stabilizers have no significant effects on EMG activities for knee joints.
NIU Wenxin, WANG Yang, HE Yan, PEI Bao qing, FAN Yubo. Effects of ankle stabilizers on electromyographic activities of lowerextremity muscles during simulated half-squat parachute landing[J]. Journal of medical biomechanics,2010,25(4):239-243Copy