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Kinetic and Training Comparisons Between Assisted, Resisted, and Free Countermovement Jumps

Argus, Christos K1; Gill, Nicholas D1; Keogh, Justin WL1; Blazevich, Anthony J2; Hopkins, Will G1

The Journal of Strength & Conditioning Research: August 2011 - Volume 25 - Issue 8 - p 2219-2227
doi: 10.1519/JSC.0b013e3181f6b0f4
Original Research

Argus, CK, Gill, ND, Keogh, JWL, Blazevich, AJ, and Hopkins, WJ. Kinetic and training comparisons between assisted, resisted, and free countermovement jumps. J Strength Cond Res 25(8): 2219-2227, 2011—Elastic band assisted and resisted jump training may be a novel way to develop lower-body power. The purpose of this investigation was to (a) determine the kinetic differences between assisted, free, and resisted countermovement jumps and (b), investigate the effects of contrast training using either assisted, free, or resisted countermovement jump training on vertical jump performance in well-trained athletes. In part 1, 8 recreationally trained men were assessed for force output, relative peak power (PP·kg−1) and peak velocity during the 3 types of jump. The highest peak force was achieved in the resisted jump method, while PP·kg−1 and peak velocity were greatest in the assisted jump. Each type of jump produced a different pattern of maximal values of the variables measured, which may have implications for developing separate components of muscular power. In part 2, 28 professional rugby players were assessed for vertical jump height before and after 4 weeks of either assisted (n = 9), resisted (n = 11), or free (n = 8) countermovement jump training. Relative to changes in the control group (1.3 ± 9.2%, mean ± SD), there were clear small improvements in jump height in the assisted (6.7 ± 9.6%) and the resisted jump training group (4.0 ± 8.8%). Elastic band assisted and resisted jump training are both effective methods for improving jump height and can be easily implemented into current training programs via contrast training methods or as a part of plyometric training sessions. Assisted and resisted jump training is recommended for athletes in whom explosive lower-body movements such as jumping and sprinting are performed as part of competition.

1Division of Sport and Recreation, Sports Performance Research Institute New Zealand, Auckland University of Technology, Auckland, New Zealand; and 2Center for Exercise and Sports Science Research, School of Exercise, Biomedical, and Health Sciences, Edith Cowan University, Joondalup, Australia

Address correspondence to Christos K. Argus,

© 2011 National Strength and Conditioning Association