Title

Changes in early and maximal isometric force production in response to moderate-and high-load strength and power training

Document Type

Journal Article

Publication Title

Journal of strength and conditioning research

PubMed ID

32187146

Publisher

National Strength and Conditioning Association

School

Centre for Exercise and Sports Science Research

Comments

Comfort, P., Jones, P. A., Thomas, C., Dos' Santos, T. M., McMahon, J. J., & Suchomel, T. J. (2022). Changes in early and maximal isometric force production in response to moderate-and high-load strength and power training. Journal of Strength and Conditioning Research, 36(3), 593-599. https://doi.org/10.1519/JSC.0000000000003544

Abstract

The aims of this study were to determine the changes in early (50-, 100-, 150-, 200-, 250 ms) and maximal isometric force production, in response to a 4-week period of moderate-load resistance training (60-82.5% 1 repetition maximum [1RM]), followed by a 4-week period of high-load (80-90% 1RM) resistance training. Thirty-four subjects (age 19.5 ± 2.8 years; height 1.72 ± 0.08 m; body mass 69.9 ± 11.4 kg; maximal power clean 0.92 ± 0.03 kg·kg) participated in this study. Only trivial-to-moderate (0.2-2.7%, d = 0.00-0.88) and nonsignificant (p > 0.05) changes in early isometric force production were observed in response to the moderate-load training period, whereas very large (9.2-14.6%, d = 2.71-4.16), significant (p ≤ 0.001) increases in early isometric force production were observed in response to high-load training. In contrast, there was a very large, significant increase in peak force (PF) across the moderate-load phase (7.7 ± 11.8%, d = 2.02, p = 0.003), but only a moderate significant increase in PF (3.8 ± 10.6%, d = 1.16, p = 0.001) across the high-load phase. The results of this study indicate that high-load multijoint resistance training, that follows moderate-load training, results in superior increases in early multi-joint force production, compared with the changes observed after moderate-load resistance training.

DOI

10.1519/JSC.0000000000003544

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