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

Comfort, P; Jones, PA; Thomas, C; Dos'Santos, TM; McMahon, JJ; Suchomel, TJ

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.

Citation

Comfort, P., Jones, P., Thomas, C., Dos'Santos, T., McMahon, J., & Suchomel, T. (2020). 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, https://doi.org/10.1519/JSC.0000000000003544

• Journal Article Type: Article
• Acceptance Date: Jan 9, 2020
• Online Publication Date: Mar 12, 2020
• Publication Date: Mar 12, 2020
• Deposit Date: Apr 2, 2020
• Publicly Available Date: Mar 12, 2021
• Journal: Journal of Strength and Conditioning Research
• Print ISSN: 1064-8011
• Electronic ISSN: 1533-4287
• Publisher: Lippincott, Williams & Wilkins
• DOI: https://doi.org/10.1519/JSC.0000000000003544
• Publisher URL: https://doi.org/10.1519/JSC.0000000000003544
• Related Public URLs: https://journals.lww.com/nsca-jscr/pages/default.aspx
• Additional Information: Additional Information : ** From PubMed via Jisc Publications Router **Journal IDs: eissn 1533-4287 **Article IDs: pubmed: 32187146 **History: published 12-03-2020