Table 3.

Mean responses during the 1-h time trial pre- and postacclimation in the experimental and control groups

	Hot Condition (38°C)		Cool Condition (13°C)
	Before	After	Before	After
Ending rectal temperature, °C
HA	39.5 ± 0.1	39.4 ± 0.2	38.8 ± 0.2	38.8 ± 0.1
Control	39.3 ± 0.2	38.9 ± 0.1*	38.9 ± 0.2	38.7 ± 0.2
Ending mean skin temperature, °C
HA	34.8 ± 0.3	33.9 ± 0.2*	24.1 ± 0.5	23.0 ± 0.3*
Control	34.7 ± 0.4	34.6 ± 0.2	23.7 ± 0.5	25.1 ± 0.7*
Core-to-skin gradient, °C
HA	4.7 ± 0.4	5.5 ± 0.3*	14.7 ± 0.5	15.8 ± 0.3*
Control	4.6 ± 0.3	4.4 ± 0.2	15.0 ± 0.4	13.3 ± 0.6*
Estimated skin blood flow, l/min
HA	2.3 ± 0.2	2.3 ± 0.2	1.0 ± 0.1	1.0 ± 0.1
Control	3.0 ± 0.3	2.8 ± 0.2	1.1 ± 0.1	1.3 ± 0.1*
Ending mean body temperature, °C
HA	38.7 ± 0.1	38.3 ± 0.2	35.9 ± 0.1	35.7 ± 0.1
Control	38.5 ± 0.1	38.1 ± 0.1	35.9 ± 0.1	36.0 ± 0.1
Total body water loss, liters
HA	1.8 ± 0.2	2.2 ± 0.2*	1.1 ± 0.1	1.3 ± 0.1*
Control	1.9 ± 0.2	2.0 ± 0.2	1.1 ± 0.1	1.1 ± 0.1
Mean power output, W
HA	201 ± 12	216 ± 14*	246 ± 13	259 ± 14*
Control	208 ± 12	201 ± 12	249 ± 12	254 ± 14
Mean blood lactate, mmol/l
HA	3.0 ± 0.3	3.2 ± 0.2	4.2 ± 0.4	4.7 ± 0.5
Control	3.3 ± 0.4	2.3 ± 0.4	3.9 ± 0.3	3.6 ± 0.5
Mean cardiac output, l/min
HA	20.1 ± 1.6	20.5 ± 1.4	22.3 ± 1.4	24.3 ± 1.5*
Control	22.6 ± 1.6	22.9 ± 1.8	25.0 ± 1.6	25.4 ± 1.9
Mean V̇o2, l/min
HA	2.79 ± 0.22	2.90 ± 0.23*	3.50 ± 0.20	3.78 ± 0.21*
Control	3.11 ± 0.16	2.97 ± 0.15	3.81 ± 0.19	3.73 ± 0.20
Mean RPE
HA	16 ± 1	16 ± 1	16 ± 1	16 ± 1
Control	16 ± 1	16 ± 1	15 ± 1	16 ± 1

Values are means ± SE for 12 subects in the experimental group and 8 subects in the control group. HA, heat acclimation. RPE, rating of received exertion.

^*P < 0.05 vs. preacclimation trial.