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Occurrence of fatigue during sets of static squat jumps at a variety of loads

Thomasson, ML and Comfort, P 2012, 'Occurrence of fatigue during sets of static squat jumps at a variety of loads' , Journal of Strength and Conditioning Research, 26 (3) , pp. 677-683.

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    Abstract

    Thomasson, ML and Comfort, P. Occurrence of fatigue during sets of static squat jumps performed at a variety of loads. J Strength Cond Res 26(3): 677–683, 2012—Research has identified that the optimal power load for static squat jumps (with no countermovement) is lower than the loads usually recommended for power training. Lower loads may permit the performance of additional repetitions before the onset of fatigue compared with heavier loads; therefore, the aim of this study was to determine the point of fatigue during squat jumps at various loads (0, 20, 40, 60% 1-repetition maximum [1RM]). Seventeen professional rugby league players performed sets of 6 squat jumps (with no countermovement), using 4 loading conditions (0, 20, 40, and 60% of 1RM back squat). Repeated measures analysis of variance revealed no significant differences (p . 0.05) in force, velocity, power, and displacement between repetitions, for the 0, 20, and 40% loading conditions. The 60% condition showed no significant difference (p . 0.05) in peak force between repetitions; however, velocity (1.12 + 0.10 and 1.18 + 0.11 m�s21 ), power (3,385 + 343 and 3,617 + 396 W) and displacement (11.13 + 2.31 and 11.85 + 2.16 cm) were significantly (p , 0.02) lower during repetition 6 compared with repetition 2. These findings indicate that when performing squat jumps (with no countermovement) with a load ,40% 1RM back squat, up to .6 repetitions can be completed without inducing fatigue and a minimum of 4–6 repetitions should be performed to achieve peak power output. When performing squat jumps (with no countermovement) with a load equal to the 60% 1RM only, 5 repetitions should be performed to minimize fatigue and ensure maintenance of velocity and power.

    Item Type: Article
    Themes: Health and Wellbeing
    Schools: Colleges and Schools > College of Health & Social Care > School of Health Sciences > Centre for Health Sciences Research
    Journal or Publication Title: Journal of Strength and Conditioning Research
    Publisher: Lippincott, Williams & Wilkins
    Refereed: Yes
    ISSN: 1064-8011
    Depositing User: P Comfort
    Date Deposited: 19 Mar 2012 10:44
    Last Modified: 02 Apr 2014 20:57
    URI: http://usir.salford.ac.uk/id/eprint/20738

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