Abstract
Background: The study explored the influence of repeated drop jumps (DJs) from different drop heights on the lower extremity bilateral asymmetry and muscle activation of countermovement jumps (CMJs). Methods: Eighteen male athletes performed 200 drop jumps (DJs200) from three drop jump height (DJH30, 40 and 50 cm). The CMJs were performed before the first DJ and after the 50th, 100th, 150th and 200th DJs, recording them as pre-CMJ, CMJs50, CMJs100, CMJs150 and CMJs200. One-way repeated measures ANOVA was used to compare differences among the three drop heights at pre-CMJ, CMJs50, CMJs100, CMJs150 and CMJs200, respectively. Results: The peak ground reaction forces (PGRF) of CMJs100, CMJs150 and CMJs200 at DJH50 were greater than at DJH30 and DJH40 (all p < 0.05). The muscle activation during CMJs50 at DJH50 was greater than at DJH30 and DJH40 (all p < 0.05). The muscle activation during CMJs100, CMJs150 and CMJs200 at DJH50 was smaller than at DJH40 and DJH30 (all p < 0.05). The PGRF had no significant difference among the three different drop heights during CMJs50 (p > 0.05). Conclusions: The DJs50 at DJH50 had no effect on the bilateral asymmetry and increased muscle activation of CMJs. The excessive DJs100 at DJH50 increased bilateral asymmetry and decreased CMJ muscle activation during CMJs.
Highlights
The countermovement jump (CMJ) is a dynamic plyometric training method for multijoint movement of the lower extremities, which rapidly develops strength through higher eccentric force to increase the concentric force development of the stretching-shortening cycle (SSC) mechanism [1]
Muscle simulation showed that thethat muscle activation during
The purpose of this study is to explore the influence of repeat drop jumps (DJs) training between different drop heights on the bilateral asymmetry and lower extremity muscle activation during CMJs
Summary
The countermovement jump (CMJ) is a dynamic plyometric training method for multijoint movement of the lower extremities, which rapidly develops strength through higher eccentric force to increase the concentric force development of the stretching-shortening cycle (SSC) mechanism [1]. The drop jump (DJ) is widely used to increase muscle strength and improve the SSC ability as an effective plyometric training method [2]. Repeated DJ training of 150 drop jumps and 50 drop jumps at 52 cm drop height increased the athletes. Reasonable DJ training can be used to increase the muscle strength of the lower extremities and enhance the SSC ability to affect CMJ performance. The study explored the influence of repeated drop jumps (DJs) from different drop heights on the lower extremity bilateral asymmetry and muscle activation of countermovement jumps (CMJs). Methods: Eighteen male athletes performed 200 drop jumps (DJs200) from three drop jump height (DJH30, 40 and 50 cm). Conclusions: The DJs50 at DJH50 had no effect on the bilateral asymmetry and increased muscle activation of CMJs. The excessive
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