Fig. 4

The effect of repetitive TI stimulation on vertical jump performance. Significant interaction effects of CMJ height (A) and SJ height (B) were observed. The interaction effect of CJ height of the first 15 s (C) was marginally significant, while no significant ineraction effect was observed in the average CJ height of the last 15 s (D). Within-group comparisons showed a significant post-intervention increase in the CMJ height, SJ height, and the average CJ height of the first 15s in the TI group. CMJ: countermovement jump; SJ: squat jump; CJ: continuous jump. # indicates a significant interaction effect (p < 0.05) and * indicates significant within-group differences (p < 0.05)