Fig 1. a-f. Sprint exercise-induced changes in blood-borne substrates, metabolites and hormones.

Plasma concentration of (a) lactate, (b) ammonia and (c) glucose and d) serum concentration of FFA, e) insulin and f) growth hormone at rest and during the exercise period of three bouts of 30-s sprint exercise with 20-min rest in between followed by a post-exercise sampling period up to 2 h and 20 min in 7 men and 7 women. P-values represent statistical level of time effect of the exercise period (ANOVA) the post-exercise period (ANOVA) and of the comparison of rest and the last point of the post-exercise period (paired t-test).