Fiber Type Composition and Rate of Force Development in Endurance- and Resistance-Trained Individuals
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Spyridon K. Methenitis ; Konstantinos Spengos ; Nikolaos D. Zaras ; Angeliki-Nikoletta E. Stasinaki ; Giorgos Papadimas [1] ; Giorgos Karampatsos ; Giannis Arnaoutis ; Gerasimos Terzis
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[1] National and Kapodistrian University of Athens
National and Kapodistrian University of Athens
Dimos Athens, Grecia
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- Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 33, Nº. 9, 2019, págs. 2388-2397
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
The purpose of the study was to investigate the relationship between muscle fiber composition and the rate of force development (RFD) in well-trained individuals with different training background. Thirty-eight young men with different training background participated: 9 endurance runners, 10 power-trained individuals, 9 strength-trained individuals, and 10 sedentary individuals. They performed maximal isometric leg press for the measurement of RFD. Body composition (dual x-ray absorptiometry) and vastus lateralis fiber type composition were also evaluated. When all participants were examined as a group, moderate correlations were found between the percent of type II muscle fibers and RFD between 100 and 600 milliseconds (r = 0.321-0.497; p <= 0.05). The correlation coefficients were higher for the cross-sectional area (CSA) and the %CSA of type II and IIx muscle fibers (r = 0.599-0.847; p < 0.001). For the power group, RFD up to 250 milliseconds highly correlated with % type IIx muscle fibers and type IIx fiber CSA (r = 0.670-0.826; p <= 0.05), as well as with %CSA of type IIx fibers (r = 0.714-0.975; p <= 0.05). Significant correlations were found between the relative RFD ([middle dot]kg-1 lower extremities lean mass) and CSA-%CSA of type II and IIx fibers for the power group (r = 0.676-0.903; p <= 0.05). No significant correlations were found between muscle morphology and RFD for the other groups. In conclusion, the present data suggest that there is a strong link between the type IIx muscle fibers and early RFD and relative RFD in power-trained participants. Type II fibers seem to be moderately linked with RFD in non-power-trained individuals.
