The impact of strength level on adaptations to combined weightlifting, plyometric and ballistic training

James, Lachlan P., Haff, G. Gregory , Kelly, Vincent G. , Connick, Mark , Hoffman, Ben and Beckman, Emma M. (2017) The impact of strength level on adaptations to combined weightlifting, plyometric and ballistic training. Scandinavian Journal of Medicine & Science in Sports, . doi:10.1111/sms.13045


Author James, Lachlan P.
Haff, G. Gregory
Kelly, Vincent G.
Connick, Mark
Hoffman, Ben
Beckman, Emma M.
Title The impact of strength level on adaptations to combined weightlifting, plyometric and ballistic training
Journal name Scandinavian Journal of Medicine & Science in Sports   Check publisher's open access policy
ISSN 1600-0838
0905-7188
Publication date 2017-12-27
Year available 2017
Sub-type Article (original research)
DOI 10.1111/sms.13045
Open Access Status Not yet assessed
Total pages 26
Place of publication Chichester, West Sussex United Kingdom
Publisher Wiley-Blackwell Publishing
Language eng
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. This article is protected by copyright. All rights reserved.
Keyword athletic performance
electromyography
jump squat
neuromuscular
power
resistance training
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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Created: Fri, 05 Jan 2018, 12:50:49 EST by Julia Finnane on behalf of School of Human Movement and Nutrition Sciences