Abstract
The effects of 30 min running with stepwise increasing intensity (exhaustive, energy demand approx. 50 → 100% ofVO2max), 60 s supramaximal running (anaerobic, ≥125% ofVO2max) and 40–60 min low-intensity running (acrobic, 40–60% ofVO2max) on serum concentration of muscle-derived proteins were studied in 5 male and 5 female elite orienteerers. S-Carbonic anhydrase III (S-CA III) was used as a marker of protein leakage from type I (slow oxidative) muscle fibres and S-myoglobin (S-Mb) as a non-selective (type I+II) muscular marker. The fractional increase in S-CA III (ΔS-Ca III) was 0.37±0.09 (mean±SEM,p<0.001), 0.10±0.05 (N. S.) and 0.46±0.09 (p<0.001) 1 h after exhaustive, anaerobic and aerobic exercise, respectively. The corresponding values for ΔS-Mb were 1.45±0.36 (p<0.001), 0.39±0.13 (p<0.01) and 0.67±0.18 (p<0.001). The value for the ΔS-CA III/ΔS-Mb ratio was 0.68±0.03 after the acrobic exercise, but only 0.25–0.26 (p vs. aerobic exercise <0.001) after the two high-intensity forms of exercise. Since type I fibres of skeletal muscle are known to be responsible for power production during low-intensity exercise, whereas fibres of both type I and type II are active at higher intensities, the ΔS-CA III/ΔS-Mb ratio may depend on the recruitment profile of type I vs. type I+II fibres.
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Takala, T.E.S., Rahkila, P., Hakala, E. et al. Serum carbonic anhydrase III, an enzyme of type I muscle fibres, and the intensity of physical exercise. Pflugers Arch. 413, 447–450 (1989). https://doi.org/10.1007/BF00594171
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DOI: https://doi.org/10.1007/BF00594171