Effects of 10Â min vs. 20Â min passive rest after warm-up on 100Â m freestyle time-trial performance: A randomized crossover study

These data suggest that the 10 min post warm-up passive rest enhances 100 m freestyle performance when compared to a 20 min period. An improvement that appears to be mediated by the combined effects of a shorter post warm-up period on core temperature, heart rate and oxygen uptake.