Neural adaptations after 4 years vs. 12 weeks of resistance training vs. untrained

BALSHAW, Thomas G, MASSEY, Garry J, MADEN-WILKINSON, Tom, LANZA, Marcel B and FOLLAND, Jonathan P (2018). Neural adaptations after 4 years vs. 12 weeks of resistance training vs. untrained. Scandinavian Journal of Medicine & Science in Sports, 29 (3), 348-359.

[img]
Preview
PDF
Maden-Wilkinson-NeuralAdaptationsAfter(AM).pdf - Accepted Version
All rights reserved.

Download (773kB) | Preview
Official URL: https://onlinelibrary.wiley.com/doi/full/10.1111/s...
Link to published version:: https://doi.org/10.1111/sms.13331
Related URLs:

    Abstract

    The purpose of this study was to compare the effect of resistance training (RT) duration, including years of exposure, on agonist and antagonist neuromuscular activation throughout the knee extension voluntary torque range. Fifty‐seven healthy men (untrained [UNT] n=29, short‐term RT [12WK] n=14, and long‐term RT [4YR] n=14) performed maximum and sub‐maximum (20‐80% maximum voluntary torque [MVT]) unilateral isometric knee extension contractions with torque, agonist and antagonist surface EMG recorded. Agonist EMG, including at MVT, was corrected for the confounding effects of adiposity (i.e. muscle‐electrode distance; measured with ultrasonography). Quadriceps maximum anatomical cross‐sectional area (QACSAMAX; via MRI) was also assessed. MVT was distinct for all three groups (4YR +60/+39% vs. UNT/12WK; 12WK +15% vs. UNT; 0.001<P≤0.021), and QACSAMAX was greater for 4YR (+50/+42% vs. UNT/12WK; [both] P<0.001). Agonist EMG at MVT was +44/+33% greater for 4YR/12WK ([both] P<0.001) vs. UNT; but did not differ between RT groups. The torque‐agonist EMG relationship of 4YR displayed a right/down shift with lower agonist EMG at the highest common torque (196 Nm) compared to 12WK and UNT (0.005≤P≤0.013; Effect size [ES] 0.90≤ES≤1.28). The torque‐antagonist EMG relationship displayed a lower slope with increasing RT duration (4YR<12WK<UNT; 0.001<P≤0.094; 0.56≤ES≤1.31), and antagonist EMG at the highest common torque was also lower for 4YR than UNT (‐69%; P<0.001; ES=1.18). In conclusion, 4YR and 12WK had similar agonist activation at MVT and this adaptation may be maximised during early months of RT. In contrast, inter‐muscular coordination, specifically antagonist co‐activation was progressively lower, and likely continues to adapt, with prolonged RT.

    Item Type: Article
    Uncontrolled Keywords: 1106 Human Movement And Sports Science; Sport Sciences
    Identification Number: https://doi.org/10.1111/sms.13331
    Page Range: 348-359
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 13 Nov 2018 17:05
    Last Modified: 01 Nov 2019 01:18
    URI: http://shura.shu.ac.uk/id/eprint/23287

    Actions (login required)

    View Item View Item

    Downloads

    Downloads per month over past year

    View more statistics