Analysis of the fibre-type distribution in the plantaris muscle after PoWeR training. A, representative image of plantaris cross section. B, fibre-type distribution for type 1, type 2a, type 2b/x and co-expression (hybrid) skeletal muscle fibres. n = 9–11 per group. Bars represent means, circles represent individual mice and error bars show standard deviation. *P < 0.05.