Table 2.

Indices of Heart Rate (HR) and Heart Rate Variability (HRV)

	Temperate (F = 3, M = 2)		Heat (F = 3, M = 2)
Variable	Baseline	Post-Training	Baseline	Post-Training
HR (bpm)	74.5 ± 6.1	72.8 ± 6.2	74.6 ± 11.1	72.6 ± 8.5
RMSSD (ms)	51.1 ± 21.4	52.0 ± 25.5	71.6 ± 23.9	65.8 ± 12.5
LnRMSSD (a.u.)	3.9 ± 0.4	3.8 ± 0.6	4.2 ± 0.4	4.1 ± 0.2
SDNN (ms)	68.3 ± 25.4	67.3 ± 24.9	87.3 ± 17.9	97.7 ± 26.9

Data presented mean ± SD

HR Heart Rate, RMSSD Root Mean Square of the Successive Differences, LnRMSSD Natural Log of RMSSD, SDNN Standard Deviation of the NN intervals, F Females, M Males