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Fig. 2. The effect of tank rest (TR) or exercise training (E₁₅ and E₃₀) on the distribution of fast muscle fibre diameters. The mean smooth probability density functions (pdf) of fast fibre diameter distributions for each experimental group are represented by the solid and broken lines. In each statistical comparison, the shaded area represents 100 bootstrap estimates of the fast muscle fibre diameter distribution for the two experimental groups combined. The dotted line shows the average muscle fibre distribution of the combined groups. (A) Several regions of the average probability density functions of each experimental group lay outside the grey shaded area of 100 bootstrap estimates of the total population. This suggested that there was a significant difference between the fast muscle fibre diameter distributions of the TR (solid line) and E₁₅ (broken line) experimental groups (P<0.05, Kolmogorov-Smirnov). (B) Several regions of the average probability density functions of each experimental group lay outside the grey shaded area of 100 bootstrap estimates of the total population. This suggested that there was a significant difference between the fast muscle fibre diameter distributions of the TR (solid line) and E₃₀ (broken line) experimental groups (P<0.05, Kolmogorov-Smirnov). (C) The average probability density functions of each experimental group lay within the grey shaded areas of 100 bootstrap estimates of the total population. This suggested that there was no significant difference in the distribution of fast muscle fibre diameters between the exercised groups (E₁₅, solid line; E₃₀, broken line). The arrows represent the apparent left-to-right shift of the distribution of fast muscle fibre diameters in E₁₅ and E₃₀ groups relative to the TR group. TR and E₁₅, N=9; E₃₀, N=6.

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