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Prediction of muscle fiber composition using multiple repetition testing

Hall, ECR, Lysenko, EA, Semenova, EA, Borisov, OV, Andryushchenko, ON, Andryushchenko, LB, Vepkhvadze, TF, Lednev, EM, Zmijewski, P, Popov, DV, Generozov, EV and Ahmetov, II (2020) Prediction of muscle fiber composition using multiple repetition testing. Biology of Sport, 38 (2). pp. 277-283. ISSN 0860-021X

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Direct determination of muscle fiber composition is invasive and expensive, with indirect methods also requiring specialist resources and expertise. Performing resistance exercises at 80% 1RM is suggested as a means of indirectly estimating muscle fiber composition, though this hypothesis has never been validated against a direct method. The aim of the study was to investigate the relationship between the number of completed repetitions at 80% 1RM of back squat exercise and muscle fiber composition. Thirty recreationally active participants’ (10 females, 20 males) 1RM back squat load was determined, before the number of consecutive repetitions at 80% 1RM was recorded. The relationship between the number of repetitions and the percentage of fast-twitch fibers from vastus lateralis was investigated. The number of completed repetitions ranged from 5 to 15 and was independent of sex, age, 1RM, training frequency, training type, training experience, BMI or muscle fiber cross-sectional area. The percentage of fast-twitch muscle fibers was inversely correlated with the number of repetitions completed (r = –0.38, P = 0.039). Participants achieving 5 to 8 repetitions (n = 10) had significantly more fast-twitch muscle fibers (57.5 ± 9.5 vs 44.4 ± 11.9%, P = 0.013) than those achieving 11–15 repetitions (n = 11). The remaining participants achieved 9 or 10 repetitions (n = 9) and on average had equal proportion of fast- and slow-twitch muscle fibers. In conclusion, the number of completed repetitions at 80% of 1RM is moderately correlated with muscle fiber composition.

Item Type: Article
Uncontrolled Keywords: 1106 Human Movement and Sports Sciences
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Termedia Publishing
Date Deposited: 29 Mar 2021 09:29
Last Modified: 04 Sep 2021 05:42
DOI or ID number: 10.5114/biolsport.2021.99705
URI: https://researchonline.ljmu.ac.uk/id/eprint/14699
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