Fiber Type Composition and Rate of Force Development in Endurance- and Resistance-Trained Individuals
| Autor: | Nikolaos Zaras, Giorgos Karampatsos, Giannis Arnaoutis, Gerasimos Terzis, Spyridon Methenitis, G.K. Papadimas, Konstantinos Spengos, Angeliki-Nikoletta Stasinaki |
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| Rok vydání: | 2017 |
| Předmět: |
Adult
Male medicine.medical_specialty Weight Lifting Physical Therapy Sports Therapy and Rehabilitation Isometric exercise Quadriceps Muscle Running 03 medical and health sciences Young Adult 0302 clinical medicine Rate of force development Endurance training Internal medicine Isometric Contraction medicine Humans Orthopedics and Sports Medicine Fiber Muscle Strength Muscle fibre Leg press Fiber type composition Chemistry Resistance Training 030229 sport sciences General Medicine Endurance Training Endocrinology Muscle Fibers Fast-Twitch Lean body mass Body Composition 030217 neurology & neurosurgery |
| Zdroj: | Journal of strength and conditioning research. 33(9) |
| ISSN: | 1533-4287 |
| Popis: | Methenitis, S, Spengos, K, Zaras, N, Stasinaki, A-N, Papadimas, G, Karampatsos, G, Arnaoutis, G, and Terzis, G. Fiber type composition and rate of force development in endurance- and resistance-trained individuals. J Strength Cond Res 33(9): 2388-2397, 2019-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 (·kg 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. |
| Databáze: | OpenAIRE |
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