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Relationship between distance walked in six minutes and CFPE-index for type I and type IIa fibres; "black circle" = type I fibres (-- = regression line for CFPE-index for type I fibres, r = 0.67, p < 0.001), "grey square"= type IIa fibres (-- = regression line for CFPE-index for type IIa fibres, r = 0.40, p = 0.02); CFPE-index = quotient between individual capillary-to-fibre ratio and fibre perimeter.
