Abstract
In order to compare the effectiveness of a daily acclimation protocol to an intermittent acclimation protocol 14 competitive rowers were randomly assigned to either a consecutive acclimation (10 consecutive days) or intermittent acclimation group (10 sessions over three weeks). For every heat exposure, subjects in each group exercised for thirty minutes at 70% ˙VO2 max in an environmental chamber set at 38°C and 70% relative humidity. Acclimation state was monitored by measuring heart rate (HR), rectal and skin temperature (Trec and Tsk), ratings of perceived exertion (RPE) and whole body sweat rate (SR) during each heat exposure. Final exercise HR decreased by 5± 13 bpm and Trec decreased by 0.6 ± 0.7 °C with intermittent heat exposure but the rate of acclimation was significantly faster (p<0.05)with daily heat exposure (HR decreased by 13 ± 12 bpm and Trec decreased by 1.0 ± 0.1 °C). RPE also decreased with daily(Day 1 RPE=16 ± 2, Day 10 RPE = 11 ± 2) but did not change with intermittent heat exposure (Day 1 RPE=17 ± 2, Day 10 RPE = 16 ± 3). SR and Tsk showed no significant changes over time in either group. Although some acclimation occurs with intermittent heat exposure it appears that daily heat exposure is the most effective acclimation strategy.
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