Biology of Sport
eISSN: 2083-1862
ISSN: 0860-021X
Biology of Sport
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abstract:
Original paper

Prediction of muscle fiber composition using multiple repetition testing

Elliott C.R. Hall
1
,
Evgeny A Lysenko
2
,
Ekaterina A. Semenova
3
,
Oleg V. Borisov
3, 4
,
Oleg N. Andryushchenko
5
,
Liliya B. Andryushchenko
6
,
Tatiana F Vepkhvadze
2
,
Egor M. Lednev
2
,
Piotr Zmijewski
7
,
Daniil V Popov
2
,
Edward V. Generozov
3
,
Ildus I Ahmetov
6, 8, 9, 10

1.
Department of Sport and Exercise Sciences, Manchester Metropolitan University, Manchester, United Kingdom
2.
Laboratory of Exercise Physiology, Institute of Biomedical Problems of the Russian Academy of Sciences, Moscow, Russia
3.
Department of Molecular Biology and Genetics, Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological Agency, Moscow, Russia
4.
Institute for Genomic Statistics and Bioinformatics, University Hospital Bonn, Bonn, Germany
5.
Department of Physical Education, Financial University under the Government of the Russian Federation, Moscow, Russia
6.
Department of Physical Education, Plekhanov Russian University of Economics, Moscow, Russia
7.
Institute of Sport – National Research Institute, Warsaw, Poland
8.
Laboratory of Molecular Genetics, Kazan State Medical University, Kazan, Russia
9.
Sports Genetics Laboratory, St Petersburg Research Institute of Physical Culture, St Petersburg, Russia
10.
Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom
Biol Sport. 2021;38(2):277–283.
Online publish date: 2020/10/26
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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.
keywords:

Fiber type, Strength training, Vastus lateralis, Exercise prescription, Endurance

 
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