Figure 2: Mechanical parameter of force generation. (a) The typical schema of force generation of each training group. The top figure represents high-frequency electrical stimulation (HFS) and the bottom figure shows low-frequency electrical stimulation (LFS). (b) The peak tetanic torque (Po). (c) The total force generation of 1 bout of exercise. HFS: high-frequency electrical stimulation group. LFS: low-frequency electrical stimulation group. All values are the mean ± SD. *** , versus HFS.