Figure 4: Changes in the distribution of type-II-fibres, [PCr]/[ ] and [PCr]/[βATP] during intervention. Training induced changes of type-II-fibres were similar in pattern to those of [PCr]/[ ] but different to those of [PCr]/[βATP]. Parameters are shown as median values; whiskers indicate interquartile range (IQR); Asterisk (*) indicates . Friedman test was not significant for the 3 parameters during intervention; Wilcoxon test resulted in a significant increase in type-II-fibres between and , and in a significant decrease between and ( ). : pretraining, : after speed-strength training, : after endurance training, : after detraining.