Sample size estimation
Sample size estimation was carried out according to the study objectives and protocol, and the difference between RMS values of sEMG of BB was obtained from the pretest of group 1 and group 2 after treatment and the healthy group. The difference between the healthy group and group 1 was 167.61 and 68.17 for group 2, and the standard deviations were respectively 127.22 and 148.46. The study effect size is 0.8, 