MHC Fiber Typing
MHC fiber typing is laboratory analysis of muscle fiber composition, quantifying the percentage of slow-twitch (Type I) and fast-twitch (Type II) fibers in a muscle sample. Based on myosin heavy chain (MHC) isoform expression, fibers are classified into Type I (slow-twitch, oxidative), Type IIa (fast-twitch, oxidative-glycolytic), and Type IIx/IId (fast-twitch, glycolytic). Introduced by Bottinelli and colleagues (1994), MHC typing requires muscle biopsy and biochemical analysis. Fiber type composition is partially genetic but trainable; endurance training promotes Type II-to-IIa conversion, while power training promotes Type I-to-IIa transitions in some contexts. Understanding fiber composition informs training prescription and explains performance predispositions.
Registro de origen
Citas copiadas textualmente del registro de origen del método. No se infiere ninguna verificación a nivel de afirmación de ellas.
- Bottinelli, R., & Reggiani, C. (2000). Human skeletal muscle fibres: acting role of fibre type in resistance training. Journal of Sports Medicine and Physical Fitness, 40(2), 166-177. · URL
- Schiaffino, S., Reggiani, C., Akimoto, T., & Blaauw, B. (2013). Fiber type specification during muscle development: growth factor signaling versus transcriptional control. Advances in Experimental Medicine and Biology, 682, 199-218. · URL
- Staron, R. S., Hagerman, F. C., Hikida, R. S., Murray, T. F., Hostler, D. P., Crill, M. T., & Ragg, K. E. (2000). Fiber type composition of the vastus lateralis muscle of young men and women. Journal of Histochemistry & Cytochemistry, 48(5), 623-629. · DOI 10.1177/002215540004800506
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Métodos relacionados
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