Kinetics and kinematics of the squat and step-up in well-trained rugby players
Journal article
Appleby, Brendyn B., Newton, Robert U. and Cormack, Stuart J.. (2019). Kinetics and kinematics of the squat and step-up in well-trained rugby players. Journal of Strength and Conditioning Research. 33, pp. 36-44. https://doi.org/10.1519/JSC.0000000000003055
Authors | Appleby, Brendyn B., Newton, Robert U. and Cormack, Stuart J. |
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Abstract | Appleby, BB, Newton, RU, and Cormack, SJ. Kinetics and kinematics of the squat and step-up in well-trained rugby players. J Strength Cond Res 33(7S): S36–S44, 2019—The purpose of this study was to compare and contrast the kinetics and kinematics of squat and step-up performance in well-trained athletes. Triaxial ground reaction force (GRF) and 3D kinematic data were collected in 4 maximal effort repetitions each at 70, 80, and 90% of 1 repetition maximum (1RM) of squat and step-up. The difference in concentric phase kinetics and kinematics between the squat and step-up was compared using effect sizes (ES ± 90% confidence limits [CLs]) classified as: less than 0.2 as trivial; 0.2–0.6 as small; 0.6–1.2 as moderate; and 1.2–2.0 as large. Where the 90% CL crossed negative and positive 0.2 values, the effect was considered “unclear.n Ground reaction force was higher for the step-up than squat at all relative intensities per leg (peak GRF ES: 2.56 ± 0.19 to 2.70 ± 0.37; average GRF ES: 1.45 ± 0.27 to 1.48 ± 0.29). Per leg, the difference in concentric impulse favored the step-up compared with squat at 70% 1RM (ES = 0.71 ± 0.40) and 80% 1RM (ES = 0.30 ± 0.41) but was unclear at 90% 1RM (ES = −0.25 ± 0.47). The squat peak velocity was greater compared with step-up at all intensities (ES = −1.74 ± 0.48 to −1.33 ± 0.48). Despite a lower external load and a single base of support, per leg, the step-up produced comparable GRF because the squat suggesting overload provided by the step-up is sufficient for maximal strength development. Future research may investigate the efficacy of the step-up in a training intervention for the development of lower-body strength. |
Keywords | force; impulse; strength; unilateral |
Year | 2019 |
Journal | Journal of Strength and Conditioning Research |
Journal citation | 33, pp. 36-44 |
Publisher | Lippincott Williams & Wilkins |
ISSN | 1533-4287 |
Digital Object Identifier (DOI) | https://doi.org/10.1519/JSC.0000000000003055 |
Scopus EID | 2-s2.0-85069148165 |
Research or scholarly | Research |
Page range | 36-44 |
Publisher's version | License All rights reserved File Access Level Controlled |
Output status | Published |
Publication dates | |
Online | Jul 2019 |
Publication process dates | |
Deposited | 03 Jun 2021 |
https://acuresearchbank.acu.edu.au/item/8w266/kinetics-and-kinematics-of-the-squat-and-step-up-in-well-trained-rugby-players
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