Comparison between two volume-matched squat exercises with and without momentary failure for changes in hormones, maximal voluntary isometric contraction strength, and perceived muscle soreness

Document Type

Journal Article

Publication Title

Journal of Strength and Conditioning Research

Publisher

National Strength and Conditioning Association

School

School of Medical and Health Sciences

RAS ID

29688

Funders

National Strength and Conditioning Association Japan

Comments

Shibata, K., Takizawa, K., Tomabechi, N., Nosaka, K., & Mizuno, M. (2021). Comparison between two volume-matched squat exercises with and without momentary failure for changes in hormones, maximal voluntary isometric contraction strength, and perceived muscle soreness. Journal of Strength and Conditioning Research, 35(11), 3063-3068. https://doi.org/10.1519/JSC.0000000000003279

Abstract

Shibata, K, Takizawa, K, Tomabechi, N, Nosaka, K, and Mizuno, M. Comparison between two volume-matched squat exercises with and without momentary failure for changes in hormones, maximal voluntary isometric contraction strength and perceived muscle soreness. J Strength Cond Res XX(X): 000–000, 2019—The present study compared 2 squat exercises with and without momentary failure (MF) for changes in blood hormones, maximal voluntary isometric contraction (MVC) strength, and perceived muscle soreness (SOR). Ten physically active male students performed squat exercises at 75% of their 1 repetition maximum in 2 conditions. First, they performed each set to MF for 3 sets, and 2 weeks later, performed the same number of repetitions in 6 sets without MF (NMF). The rate of perceived exertion was assessed at 30 minutes after exercise. Blood lactate, serum concentrations of growth hormone (GH), testosterone, insulin-like growth factor 1 (IGF-1) and cortisol, MVC strength, and SOR were measured before and after each exercise. Rate of perceived exertion was higher (p < 0.01) in MF (8.3 ± 1.2) than in NMF (4.1 ± 1.4). Blood lactate was greater (p < 0.01) at 5 minutes after MF (7.2 ± 0.7 mM·L−1) than NMF (3.6 ± 0.7 mM·L−1). At 30 minutes after exercise, GH (MF: 12.3 ± 8.3 ng·ml−1, NMF: 4.4 ± 5.2 ng·ml−1) and cortisol (MF: 19.0 ± 4.3 μg·dl−1, NMF: 14.2 ± 4.6 μg·dl−1) were greater (p < 0.01) for MF than NMF, but no significant differences were observed between conditions for testosterone and IGF-1. Maximal voluntary isometric contraction strength decrease (6.1 ± 8.8%) at 24 hours after exercise was evident only for MF, but SOR at 24 hours after exercise was similar between MF (4.8 ± 3.3 cm) and NMF (2.5 ± 2.4 cm) conditions. These results suggest that mechanical and metabolic stimulus to the muscles were greater for MF than NMF condition.

DOI

10.1519/JSC.0000000000003279

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