Squat and countermovement jump performance across a range of loads: a comparison between Smith machine and free weight execution modes in elite sprinters

Loturco, Irineu, Mcguigan, Michael R., Freitas, Tomas T., Nakamura, Fabio Y., Boullosa, Daniel A., Valenzuela, Pedro L., Pereira, Lucas A., and Pareja-Blanco, Fernando (2022) Squat and countermovement jump performance across a range of loads: a comparison between Smith machine and free weight execution modes in elite sprinters. Biology of Sport, 39 (4). pp. 1043-1048.

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The aims of this study were to: 1) provide and compare the height achieved during Smith machine (SM) and free weight (FW) loaded jumps executed over a wide spectrum of loads (40–120% of body mass [BM]); and 2) test the difference between loaded and unloaded squat jump (SJ) and countermovement jump (CMJ) attempts in this highly trained male sprinters. On the first visit, athletes performed unloaded SJ and CMJ, loaded SJ with loads corresponding to 40, 60, 80, 100, and 120% BM, and loaded CMJ at 100% BM using an Olympic barbell (FW). On the second visit, they performed loaded SJ and CMJ tests under the same loading conditions on the SM device and,subsequently, a half-squat one-repetition maximum (1RM) assessment. The relative strength (RS = 1RM/BM) of the athletes was 2.54 ± 0.15. Loaded SJ performance was similar between SM and FW, and across all loading conditions. Differences in favor of CMJ (higher jump heights compared with SJ) were superior in the unloaded condition but decreased progressively as a function of loading. In summary, sprinters achieved similar SJ heights across a comprehensive range of loads, regardless of the execution mode (FW or SM). The positive effect of the countermovement on jump performance is progressively reduced with increasing load.

Item ID: 77160
Item Type: Article (Research - C1)
ISSN: 2083-1862
Keywords: Athletic performance, Track and field, Vertical jump, Loaded jump, Resistance training, Ballistic exercises
Copyright Information: © Institute of Sport – National Research Instutite. All articles are distributed under the terms of the Creative Commons Attribution Share Alike 4.0 License (https://creativecommons.org/licenses/by-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and remix, transform, and build upon the material for any purpose, even commercially, provided the original work is properly cited and states its license.
Date Deposited: 04 Jan 2023 08:43
FoR Codes: 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420702 Exercise physiology @ 100%
SEO Codes: 13 CULTURE AND SOCIETY > 1306 Sport, exercise and recreation > 130699 Sport, exercise and recreation not elsewhere classified @ 100%
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