Association of muscle fiber composition with health and exerciserelated traits in athletes and untrained subjects

Hall Elliott, C.R.; Semenova, E.A.; Bondareva, E.A.; Borisov, O.V.; Andryushchenko, O.N.; Andryushchenko, L.B.; Zmijewski, P.; Generozov, E.V.; Ahmetov, I.I.

Авторы: Hall Elliott C.R, Semenova Ekaterina A., Bondareva Elvira A., Borisov Oleg V., Andryushchenko Oleg N., Andryushchenko Liliya B., Zmijewski Piotr, Generozov Edward V., Ahmetov Ildus I.
Журнал: Biology of Sport
Том: 38
Номер: 4
Год издания: 2021
Издательство: Instytut Sportu/Institute of Sport
Местоположение издательства: Poland
Первая страница: 659
Последняя страница: 666
DOI: 10.5114/biolsport.2021.102923
Аннотация: ABSTRACT: Skeletal muscle is a heterogenous and metabolically active tissue, the composition of which isassociated with multiple traits. The aim of the study was to determine whether there are additional health andexercise-related traits associated with muscle fiber composition in athletes and non-athletes. This study recruited164 Russian participants (51 endurance and 48 power athletes; 65 controls). Vastus lateralis muscle fiber compositionwas assessed by immunohistochemistry. Slow-twitch muscle fiber percentage (STMF%) was significantly greaterin endurance than power athletes and non-athletes, and in non-athlete females than males. STMF% was positivelyassociated with athletes’ training frequency, non-athletes’ and endurance athletes’ age, endurance athletes’competition level and chest depth, and power athletes’ training age. STMF% was negatively associated withdiastolic blood pressure in power athletes and with systolic blood pressure and reaction time in non-athletes.In all participants, STMF% was positively associated with age, tolerance to long distance exercise, chest depthand fracture incidence, and negatively with systolic blood pressure and resting heart rate. Age, sex and trainingfrequency explained 10.6% and 13.2% of the variance in STMF% in endurance and power athletes, respectively.This is one of the most comprehensive studies involving athletes and untrained subjects and provides novelinformation concerning associations of increased STMF percentage with lower resting heart rate, better toleranceto long distances, faster reaction time and larger chest depth. On the other hand, the increased percentage offast-twitch muscle fibers was associated with rare fracture incidence.
Добавил в систему: Бондарева Эльвира Александровна

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