Heat acclimation does not protect trained males from hyperthermia-induced impairments in complex task performance

TY - JOUR

T1 - Heat acclimation does not protect trained males from hyperthermia-induced impairments in complex task performance

AU - Piil, Jacob Feder

AU - Mikkelsen, Jacob

AU - Junge, Nicklas

AU - Morris, Nathan Bradley

AU - Nybo, Lars

N1 - CURIS 2019 NEXS 082

PY - 2019/3/1

Y1 - 2019/3/1

N2 - This study evaluated if adaptation to environmental heat stress can counteract the negative effects of hyperthermia on complex motor performance. Thirteen healthy, trained males completed 28 days of heat acclimation with 1 h daily exercise exposure to environmental heat (39.4 ± 0.3 °C and 27.0 ± 1.0% relative humidity). Following comprehensive familiarization, the participants completed motor-cognitive testing before acclimation, as well as after 14 and 28 days of training in the heat. On all three occasions, the participants were tested, at baseline (after ~15 min passive heat exposure) and following exercise-induced hyperthermia which provoked an increase in core temperature of 2.8 ± 0.1 °C (similar across days). Both cognitively dominated test scores and motor performance were maintained during passive heat exposure (no reduction or difference between day 0, 14, and 28 compared to cool conditions). In contrast, complex motor task performance was significantly reduced in hyperthermic conditions by 9.4 ± 3.4% at day 0; 15.1 ± 5.0% at day 14, and 13.0 ± 4.8% at day 28 (all p < 0.05 compared to baseline but not different across days). These results let us conclude that heat acclimation cannot protect trained males from being negatively affected by hyperthermia when they perform complex tasks relying on a combination of cognitive performance and motor function.

AB - This study evaluated if adaptation to environmental heat stress can counteract the negative effects of hyperthermia on complex motor performance. Thirteen healthy, trained males completed 28 days of heat acclimation with 1 h daily exercise exposure to environmental heat (39.4 ± 0.3 °C and 27.0 ± 1.0% relative humidity). Following comprehensive familiarization, the participants completed motor-cognitive testing before acclimation, as well as after 14 and 28 days of training in the heat. On all three occasions, the participants were tested, at baseline (after ~15 min passive heat exposure) and following exercise-induced hyperthermia which provoked an increase in core temperature of 2.8 ± 0.1 °C (similar across days). Both cognitively dominated test scores and motor performance were maintained during passive heat exposure (no reduction or difference between day 0, 14, and 28 compared to cool conditions). In contrast, complex motor task performance was significantly reduced in hyperthermic conditions by 9.4 ± 3.4% at day 0; 15.1 ± 5.0% at day 14, and 13.0 ± 4.8% at day 28 (all p < 0.05 compared to baseline but not different across days). These results let us conclude that heat acclimation cannot protect trained males from being negatively affected by hyperthermia when they perform complex tasks relying on a combination of cognitive performance and motor function.

KW - Faculty of Science

KW - Visuo-motor tracking

KW - Mathematics

KW - Motor performance

KW - Hyperthermia

KW - Core temperature

KW - Task complexity

KW - Heat stress

U2 - 10.3390/ijerph16050716

DO - 10.3390/ijerph16050716

M3 - Journal article

C2 - 30823366

SN - 1661-7827

VL - 16

JO - International Journal of Environmental Research and Public Health

JF - International Journal of Environmental Research and Public Health

IS - 5

M1 - 716

ER -