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ORIGINAL ARTICLE EXERCISE PHYSIOLOGY AND BIOMECHANICS Open access
The Journal of Sports Medicine and Physical Fitness 2024 March;64(3):248-54
DOI: 10.23736/S0022-4707.23.15468-5
Copyright © 2023 THE AUTHORS
This is an open access article distributed under the terms of the CC BY-NC 4.0 license which allows users to distribute, remix, adapt and build upon the manuscript, as long as this is not done for commercial purposes, the user gives appropriate credits to the original author(s) and the source (with a link to the formal publication through the relevant DOI), provides a link to the license and indicates if changes were made.
language: English
Effects of progressive weight addition using vests on rebound jump
Amane ZUSHI 1 ✉, Kodayu ZUSHI 2, Takuya YOSHIDA 1
1 Japan Institute of Sports Sciences, Tokyo, Japan; 2 Faculty of Economics, University of Shiga, Shiga, Japan
BACKGROUND: Rebound jump (RJ) is an exercise that is as short contact time and high as possible and is used to improve lower limb stretch-shortening cycle movements. This study examined the effects of RJ performance and lower limb joint kinetics when weight was incrementally added using a weighted vest.
METHODS: Eleven male athletes (mean±standard deviation: age, 21.9±1.6 years; height, 176.3±5.5 cm; weight, 67.8±4.2 kg) performed RJ at 0% (no load), 5%, 9%, 12%, 15%, 18%, and 21% added weight. Body coordinates and ground reaction force were measured, and RJ index (jump height / contact time) and joint kinetics (joint torque, power, and work) were calculated.
RESULTS: One-way Analysis of Variance showed that the RJ was significantly reduced starting from 12% (P<0.01), the jump height was significantly decreased starting from 12% (P<0.01), and the contact time was significantly increased only at 21% (P<0.01) compared with 0%. The negative peak power of the ankle joint decreased by 21% of the added weight (P<0.01). The main effects of body weight on the peak torque at the knee and hip joints and the positive peak power at the knee joint were observed.
CONCLUSIONS: RJ with increasing weight tended to decrease jump height first, rather than longer contact time. However, it was suggested that there is an appropriate range of added weights that can be trained without decreasing the RJ index.
KEY WORDS: Lower extremity; Joints; Kinetics