The Influence of Repeated Drop Jump Training on Countermovement Jump Performance

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.

Effects of a neuromuscular training program on the performance and inter-limb asymmetries in highly trained junior male tennis players

“…Due to the fact that tennis is a sport in which limb asymmetries arise from repetitive use of the dominant hand/leg [ 56 ] and considering that unilateral tests such as DJ could be a predictor of lower limb asymmetries, it would be interesting to incorporate it. Moreover, He et al [ 57 ] reported that DJ training could affect positively in some other jumps like CMJ, which could be interesting to include both jumps in training programs for young tennis players. The literature suggests that plyometric training increases lower limb power in HJ [ 58 , 59 ].…”

A 10-week neuromuscular program improved specific skills in young competitive tennis players

“…Como se ha expuesto anteriormente, en nuestro programa de entrenamiento se ha apostado por ejercicios unilaterales, por lo que las mejoras en ambas piernas han sido muy similares, evitando así las posibles descompensaciones que pudiera generar un entrenamiento basado en ejercicios bilaterales. Según este artículo de He et al (He et al, 2022) el entrenamiento del DJ puede repercutir positivamente en otros saltos como el CMJ, por lo que se explicaría la enorme mejora que tuvieron nuestros deportistas en esta prueba.…”

Increased Asymmetry of Lower Limbs and Leading Joint Angles during Crossing Obstacles in Healthy Male with Cold Exposure

“…Two infrared reflective markers were placed on either ends of the tube to define the position of the obstacle. A modified Simple Helen Hayes with 19 reflective markers was secured over selected anatomic landmarks to track the motion of the body segments (as previous research [ 13 ]). A 10-camera system (Vicon V5 cameras, Vicon Motion Systems Ltd., Oxford, UK) and Nexus software (Version 2.9.0, Vicon Motion Systems, UK) were used to capture the motion with a sampling rate of 200 Hz and a fourth-order Butterworth filter with a cut-off frequency of 5 Hz for low-pass filtering, while three force plates (AMTI BP600900) were used at a sampling frequency of 1200 Hz to collect ground reaction forces (GRF).…”