6533b7d5fe1ef96bd12650a7

RESEARCH PRODUCT

Effect of training on aerobic capacity of female athletes differing in muscle fibre composition

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Abstract The effects of endurance training were studied in two groups of female cross‐country skiers who differed in muscle fibre composition. The ST‐group (n = 10) had 56–76% slow twitch (ST) muscle fibres and the FT‐group (n= 10) 40–55% ST fibres in the m. vastus lateralis. During a four‐month period, the subjects trained on the average 81 km per week. The intensive training (heart rate 0–15 beats per min below maximum) averaged 8.5 km per week. The differences in training between the two groups were not significant. The ST‐group significantly increased their cycling maximum oxygen uptake (C max, 4.6%, P <0.01) and the anaerobic threshold (AT, 2.8%, P <0.01) during the training period whereas no significant changes were observed in the FT‐group. Both the ST‐group and the FT‐group increased their skiwalking maximum oxygen uptake (S max), on average 8.7% (P <0.01) and 3.8% (P <0.05), respectively. In the ST‐group, no significant correlations were found between training and the physiological parameters. In...