Abstract
The myosin heavy chain (MHC) composition of single fibres from m. vastus lateralis was analysed by one-dimensional electrophoresis and immunoblotting in three groups of young men with distinct difference in physical activity patterns. No major co-existence of MHC isoforms was found in the group with some daily physical activity. In the very sedentary group, however, 19±5% (P<0.05) of the fibres exhibited coexistence of MHC type IIa and IIb. Further, in the endurance trained group co-existence of MHC type I and IIa was manifested in 36±4% (P<0.05) of the fibres. Disuse and extreme usage of muscle both give rise to an elevation in co-expression of MHC isoforms in single muscle fibres but of markedly different combination of isoforms.
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Klitgaard, H., Bergman, O., Betto, R. et al. Co-existence of myosin heavy chain I and IIa isoforms in human skeletal muscle fibres with endurance training. Pflügers Arch 416, 470–472 (1990). https://doi.org/10.1007/BF00370757
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DOI: https://doi.org/10.1007/BF00370757