NDLI: Do greater rates of body heat storage precede the accelerated reduction of self-paced exercise intensity in the heat?

Content Provider	Springer Nature Link
Author	Ravanelli, Nicholas M. Cramer, Matthew N. Molgat Seon, Yannick Carlsen, Anthony N. Jay, Ollie
Copyright Year	2014
Abstract	To reevaluate the previous hypothesis that greater reductions in self-paced exercise intensity in the heat are mediated by early differences in the rate of body heat storage (S).Eight trained volunteers cycled in 19 °C/1.8 kPa (COOL), 25 °C/1.2 kPa (NORM), and 34 °C/1.6 kPa (HOT), while maintaining an RPE of 16. Potential differences in S following the onset of exercise were assessed by comparing rates of esophageal temperature change (ΔT es/Δt); and estimated S values using a traditional two-compartment thermometric model (S therm) of changes in rectal (T re) and skin (T sk) temperature, and partitional calorimetry (S cal).After 15 min of exercise, workload decreased more in HOT vs. COOL (P = 0.03), resulting in a shorter time (HOT: 40.7 ± 14.9 min; COOL: 53.5 ± 18.7 min; P = 0.04) to 70 % of initial workload. However, there were no preceding differences in ΔT es/Δt between conditions (P = 0.18). S therm values were different between HOT and COOL during the first 5 min of exercise (P < 0.05), primarily due to negative S therm values (−32 ± 15 kJ min−1) in COOL, which according to partitional calorimetric measurements, required improbably high (~56 kJ min−1) rates of evaporation when no sweating on the back and thigh was observed until after 7.6 ± 1.5 min and 4.8 ± 1.7 min of exercise, respectively. S cal values in the first 5 min of exercise confirmed S was actually positive in COOL (+21 ± 8 kJ min−1) and not negative. Different S therm values following the onset of exercise at different environmental temperatures are simply due to transient differences in the rate of change in T sk.Reductions in self-paced exercise intensity in the heat are not mediated by early differences in S following the onset of exercise.
Starting Page	2399
Ending Page	2410
Page Count	12
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	114
Issue Number	11
e-ISSN	14396327
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-08-05
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Core temperature Exercise performance Partitional calorimetry Rating of perceived exertion Thermoregulation Human Physiology Occupational Medicine/Industrial Medicine Sports Medicine
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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