Human skeletal muscle fiber type alteration with high-intensity intermittent training
- 894 Downloads
The response of muscle fiber type proportions and fiber areas to 15 weeks of strenuous high-intensity intermittent training was investigated in twenty-four carefully ascertained sedentary (14 women and 10 men) and 10 control (4 women and 6 men) subjects. The supervised training program consisted mainly of series of supramaximal exercise lasting 15 s to 90 s on a cycle ergometer. Proportions of muscle fiber type and areas of the fibers were determined from a biopsy of the vastus lateralis before and after the training program. No significant change was observed for any of the histochemical charactertics in the control group. Training significantly increased the proportion of type I and decreased type IIb fibers, the proportion of type IIa remained unchanged. Areas of type I and IIb fibers increased significantly with training. These results suggest that high-intensity intermittent training in humans may alter the proportion of type I and the area of type I and IIb fibers and in consequence that fiber type composition in human vastus lateralis muscle is not determined solely by genetic factors.
Key wordsHuman skeletal muscle Muscle fiber type Exercise-training
Unable to display preview. Download preview PDF.
- Bonen A, Campbell CJ, Kirby RL, Belcastro AN (1978) Relationship between slow-twitch muscle fibers and lactic acid removal. Can J Appl Sport Sci 3:160–162Google Scholar
- Boulay MR, Lortie G, Simoneau JA, Bouchard C (1985) Sensitivity of maximal aerobic power and capacity to anaerobic training is partly genotype dependent. In: Malina RM, C Bouchard (eds). Sport and human genetics. Human Kinetics, Champaign (IL) [in press]Google Scholar
- Costill DL, Coyle EF, Fink WF, Lesmes GR, Witzmann FA (1979) Adaptations in skeletal muscle following strength training. J Appl Physiol: Respirat Environ Exercise Physiol 46:96–99Google Scholar
- Hermansen L (1979) Effect of acidosis on skeletal muscle performance during maximal exercise in man. Bull Eur Physiopathol Resp 15:229–238Google Scholar
- Holloszy JO, Coyle EF (1984) Adaptations of skeletal muscle endurance exercise and their metabolic consequences. J Appl Physiol: Respirat Environ Exercise Physiol 56:831–838Google Scholar
- Komi PV, Karlsson J (1979) Physical performance, skeletal muscle enzyme activities and fiber types in monozygous and dizygous twins of both sexes. Acta Physiol Scand [Suppl] 462:1–28Google Scholar
- Lortie G, Simoneau JA, Boulay MR, Bouchard C (1985) Muscle fiber type composition and enzyme activities in brothers and monozygotic twins. In: Malina RM, Bouchard C (eds): Sport and human genetics. Human Kinetics, Champaign (IL) [in press]Google Scholar
- Prud'Homme D, Bouchard C, Leblanc C, Landry F, Lortie G, Boulay MR (1984) Reliability of assessments of ventilatory thresholds. J Sports Sci 2:13–24Google Scholar
- Sahlin K, Harris RC, Hultman E (1979) Resynthesis of creatine phosphate in human muscle after exercise in relation to intramuscular pH and availability of oxygen. Scand J Clin Lab Invet 39:551–558Google Scholar
- Sjogaard G (1978) Force-velocity curve for bicycle work. In: Asmussen E, Jorgensen K (eds) Biomechanics VIa. University Park Press, Baltimore, p 93Google Scholar
- Thorstensson A (1976) Muscle strength, fiber types and enzyme activities in man. Acta Physiol Scand [Suppl] 443:1–45Google Scholar