Summary
The vastus lateralis muscles of eleven male elite sprinters (17–28 years) were investigated in order to examine the impact of high tension anaerobic muscular work on muscle fibre fine structure. In an attempt to reproduce the training regimen six subjects ran 20 repetitions of 25 s on a treadmill with 2 min 35 s in between, at a speed corresponding to 86% of their personal best 200 m time. PAS-stained sections of biopsies taken approximately 2 h after training generally indicated glycogen depletion in type 1 and type 2B fibres. At the light microscopic level, no signs of inflammation or fibre rupture were observed. However, at the ultrastructural level, frequent abnormalities of the contractile material and the cytoplasmic organelles were detected. Z-band streaming, autophagic vacuoles and abnormal mitochondria were the most conspicuous observations. Control specimens from sprinters who did not perform the acute exercise routine also displayed structural deviations, although to a lesser degree. It is hypothesized that during sprint training the leg musculature is put under great mechanical and metabolic stress which causes the degenerative response reported here.
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This study was supported by grants from the Swedish Society of Medical Sciences, the Tore Nilsson Foundation for Medical Research, the Coca Cola Export Company, Sweden and the Swedish Sports Research Council
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Fridén, J., Seger, J. & Ekblom, B. Sublethal muscle fibre injuries after high-tension anaerobic exercise. Europ. J. Appl. Physiol. 57, 360–368 (1988). https://doi.org/10.1007/BF00635996
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DOI: https://doi.org/10.1007/BF00635996