The impact of strength level on adaptations to combined weightlifting, plyometric, and ballistic training
Article
Article Title | The impact of strength level on adaptations to combined weightlifting, plyometric, and ballistic training |
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ERA Journal ID | 9803 |
Article Category | Article |
Authors | James, L. P. (Author), Haff, G. Gregory (Author), Kelly, V. G. (Author), Connick, M. J. (Author), Hoffman, B. W. (Author) and Beckman, E. M. (Author) |
Journal Title | Scandinavian Journal of Medicine and Science in Sports |
Journal Citation | 28 (5), pp. 1494-1505 |
Number of Pages | 12 |
Year | 2018 |
Publisher | John Wiley & Sons |
Place of Publication | Denmark |
ISSN | 0905-7188 |
1600-0838 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/sms.13045 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/epdf/10.1111/sms.13045 |
Abstract | The purpose of this investigation was to determine if the magnitude of adaptation to integrated ballistic training is influenced by initial strength level. Such information is needed to inform resistance training guidelines for both higher- and lower-level athlete populations. To this end, two groups of distinctly different strength levels (stronger: one-repetition-maximum (1RM) squat = 2.01 ± 0.15 kg.BM−1; weaker: 1.20 ± 0.20 kg.BM−1) completed 10 weeks of resistance training incorporating weightlifting derivatives, plyometric actions and ballistic exercises. Testing occurred at pre-, mid- and post-training. Measures included variables derived from the incremental-load jump squat and the 1RM squat, alongside muscle activity (electromyography), and jump mechanics (force-time comparisons throughout the entire movement). The primary outcome variable was peak velocity derived from the unloaded jump squat. It was revealed that the stronger group displayed a greater (P = 0.05) change in peak velocity at midtest (baseline: 2.65±0.10 m∙s−1, midtest: 2.80±0.17 m∙s−1) but not posttest (2.85±0.18 m∙s−1) when compared to the weaker participants (baseline 2.48 ±0.09, midtest. 2.47 ±0.11, posttest: 2.61 ±0.10 m∙s−1). Different changes occurred between groups in the force-velocity relationship (P=0.001–0.04) and jump mechanics (P≤0.05), while only the stronger group displayed increases in muscle activation (P=0.05). In conclusion, the magnitude of improvement in peak velocity was significantly influenced by pre-existing strength level in the early stage of training. Changes in the mechanisms underpinning performance were less distinct. |
Keywords | electromyography, jump squat, resistance training, athletic performance, neuromuscular, power |
ANZSRC Field of Research 2020 | 420702. Exercise physiology |
420701. Biomechanics | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | University of Queensland |
Edith Cowan University | |
School of Health and Wellbeing | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q48xx/the-impact-of-strength-level-on-adaptations-to-combined-weightlifting-plyometric-and-ballistic-training
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James_et_al-2017-Scandinavian_Journal_of_Medicine_&_Science_in_Sports.pdf | ||
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