Heat acclimation does not protect trained males from hyperthermia-induced impairments in complex task performance
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Heat acclimation does not protect trained males from hyperthermia-induced impairments in complex task performance. / Piil, Jacob Feder; Mikkelsen, Jacob; Junge, Nicklas; Morris, Nathan Bradley; Nybo, Lars.
In: International Journal of Environmental Research and Public Health, Vol. 16, No. 5, 716, 2019.Research output: Contribution to journal › Journal article › Research › peer-review
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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
Y1 - 2019
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
VL - 16
JO - International Journal of Environmental Research and Public Health
JF - International Journal of Environmental Research and Public Health
SN - 1661-7827
IS - 5
M1 - 716
ER -
ID: 214301586