Fig. 4.

Example of a cross-sectional research protocol for evaluating heat acclimation (HA) decay. Heart rate (mean ± standard deviation) for eight participants who re-acclimated (RA) for 5 days starting 12 days after a 10-day HA period (RA₁₂) and eight participants that re-acclimated for 7 days starting 26 days after a 10-day HA period (RA₂₆). Circles indicate the day after which there were no significant changes. Asterisks denote significant differences from the mean of the end of the HA period (day 8–10). Reproduced with permission from Weller et al. [75]