The Influence of Repeated Drop Jump Training on Countermovement Jump Performance.

Lin He,I-Lin Wang,Guo-Dong Ma,Chou Wu,Yu-Ge Li,Shun Yao,Yu Su,Mohammad Rahimi-Gorji

doi:10.1155/2022/9609588

Abstract

Countermovement jump (CMJ) is used to assess athletic performance of the lower limbs. Drop jump (DJ) is an effect training method that can improve athlete's jumping performance. The main purpose of this study is to explore the effects of different drop jump heights (DJH)30, DJH40, and DJH50 cm for 250 drop jumps (DJs250) on CMJ. Eighteen male athletes were selected as subjects. After the 50th, 100th, 150th, 200th, and 250th DJs, perform 5 groups of CMJ (the average of 3 times for each group) and record them as the 50th, 100th, 150th, 200th, and 250th CMJ jumps (CMJs50, CMJs100, CMJs150, CMJs200, and CMJs250). The BTS motion capture system and two force plates are used to record data. The MATLAB software was used to analyze data through one-way ANOVA repeated measures. If there is a significant difference, the LSD method is used for post hoc comparison. Jump height (JH), contact time (CT), reaction intensity index (RSI), average rate of force development (ARFD), left average rate of force development (LARFD), and right average rate of force development (RARFD) of CMJs50, CMJs100, CMJs150, and CMJs200 at DJH50 were greater than those at DJH40 and DJH30 (all p < 0.05). DJH50 height and DJs200 training times can improve SSC mechanism and improve athlete CMJ performance.

Highlights

Countermovement jumps (CMJs) are coordinated movements often used to evaluate lower extremity jump ability and sports performance [1]
The experimental results showed that the Jump height (JH), contact time (CT), reaction intensity index (RSI), average rate of force development (ARFD), left average rate of force development (LARFD), and right average rate of force development (RARFD) of CMJs50, CMJs100, The purpose of this study was to compare the effects of repeated Drop jump (DJ) training at different drop heights (DJH30, DJH40, and DJH50) on CMJ performance
This study found that the CT of CMJs50, CMJs100, CMJs150, and CMJs200 at DJH50 was greater than that at DJH40 and DJH30

Summary

Introduction

Countermovement jumps (CMJs) are coordinated movements often used to evaluate lower extremity jump ability and sports performance [1]. CMJ involves rapid and powerful stretching of the lower extremity muscles immediately after shortening. The continuous concentric contraction and eccentric contraction of the muscles are called the stretch-shortening cycle (SSC) [2]. Past studies have found that using the SSC elastic energy mechanism increases the strength, speed, and muscle activation of the CMJ eccentric phase and increases the jump height during the CMJ concentric phase [3]. Applying the SSC mechanism can enhance the muscle strength of the lower extremities and the jumping height in the CMJ to improve athletic performance. Previous studies have found that drop jumps (DJs) are an effective plyometric training (PT) and SSC training method, currently being widely used to improve jumping ability and leg strength to improve athletic performance [3, 4]. DJ training can enhance the SSC mechanism to improve CMJ performance

Objectives

Findings

Methods

Conclusion