Effect of long-term maximum strength training on explosive strength, neural, and contractile properties.
JournalScandinavian Journal of Medicine & Science in Sports
MetadataShow full item record
AbstractThe purpose of this cross-sectional study was to compare explosive strength and underpinning contractile, hypertrophic, and neuromuscular activation characteristics of long-term maximum strength-trained (LT-MST; ie, ≥3 years of consistent, regular knee extensor training) and untrained individuals. Sixty-three healthy young men (untrained [UNT] n = 49, and LT-MST n = 14) performed isometric maximum and explosive voluntary, as well as evoked octet knee extension contractions. Torque, quadriceps, and hamstring surface EMG were recorded during all tasks. Quadriceps anatomical cross-sectional area (QACSAMAX ; via MRI) was also assessed. Maximum voluntary torque (MVT; +66%) and QACSAMAX (+54%) were greater for LT-MST than UNT ([both] p < 0.001). Absolute explosive voluntary torque (25-150 ms after torque onset; +41 to +64%; [all] p < 0.001; 1.15≤ effect size [ES]≤2.36) and absolute evoked octet torque (50 ms after torque onset; +43, p < 0.001; ES = 3.07) were greater for LT-MST than UNT. However, relative (to MVT) explosive voluntary torque was lower for LT-MST than UNT from 100 to 150 ms after contraction onset (-11% to -16%; 0.001 ≤ p ≤ 0.002; 0.98 ≤ ES ≤ 1.11). Relative evoked octet torque 50 ms after onset was lower (-10%; p < 0.001; ES = 1.14) and octet time to peak torque longer (+8%; p = 0.001; ES = 1.18) for LT-MST than UNT indicating slower contractile properties, independent from any differences in torque amplitude. The greater absolute explosive strength of the LT-MST group was attributable to higher evoked explosive strength, that in turn appeared to be due to larger quadriceps muscle size, rather than any differences in neuromuscular activation. In contrast, the inferior relative explosive strength of LT-MST appeared to be underpinned by slower intrinsic/evoked contractile properties.
Rights/Terms© 2022 The Authors. Scandinavian Journal of Medicine & Science In Sports published by John Wiley & Sons Ltd.
rate of torque development
Identifier to cite or link to this itemhttp://hdl.handle.net/10713/17723
- Neural adaptations after 4 years vs 12 weeks of resistance training vs untrained.
- Authors: Balshaw TG, Massey GJ, Maden-Wilkinson TM, Lanza MB, Folland JP
- Issue date: 2019 Mar
- Training-specific functional, neural, and hypertrophic adaptations to explosive- vs. sustained-contraction strength training.
- Authors: Balshaw TG, Massey GJ, Maden-Wilkinson TM, Tillin NA, Folland JP
- Issue date: 2016 Jun 1
- The influence of patellar tendon and muscle-tendon unit stiffness on quadriceps explosive strength in man.
- Authors: Massey GJ, Balshaw TG, Maden-Wilkinson TM, Tillin NA, Folland JP
- Issue date: 2017 Apr 1
- Explosive strength: effect of knee-joint angle on functional, neural, and intrinsic contractile properties.
- Authors: Lanza MB, Balshaw TG, Folland JP
- Issue date: 2019 Aug
- Neuromuscular determinants of explosive torque: Differences among strength-trained and untrained young and older men.
- Authors: Orssatto LBR, Wiest MJ, Moura BM, Collins DF, Diefenthaeler F
- Issue date: 2020 Nov