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Effect of short-term heat acclimation with permissive dehydration on thermoregulation and temperate exercise performance.
Scand J Med Sci Sports 2016; 26(8):875-84SJ

Abstract

We examined the effect of short-term heat acclimation with permissive dehydration (STHADe) on heat acclimation (HA) and cycling performance in a temperate environment. Ten trained male cyclists [mean (SD) maximal oxygen uptake: 63.3(4.0) mL/kg/min; peak power output (PPO): 385(40) W; training: 10 (3) h/week] underwent a STHADe program consisting of 5 days of exercise (maximum 90 min/day) in a hot environment (40 °C, 50% RH) to elicit isothermic heat strain [rectal temperature 38.64(0.27) °C]. Participants abstained from fluids during, and 30 min after, HA sessions. Pre- and post-STHADe HA was evaluated during euhydrated fixed-intensity exercise (60 min) in hot conditions; the effect of STHADe on thermoregulation was also examined under temperate conditions (20 min fixed-intensity exercise; 22 °C, 60% RH). Temperate cycling performance was assessed by a graded exercise test (GXT) and 20-km time trial (TT). STHADe reduced thermal and cardiovascular strain in hot and temperate environments. Lactate threshold [Δ = 16 (17) W] and GXT PPO [Δ = 6 (7) W] were improved following STHADe (P < 0.05), but TT performance was not affected (P > 0.05), although there was a trend for a higher mean power (P = 0.06). In conclusion, STHADE can reduce thermal and cardiovascular strain under hot and temperate conditions and there is some evidence of ergogenic potential for temperate exercise, but longer HA regimens may be necessary for this to meaningfully influence performance.

Authors+Show Affiliations

Department of Sport and Exercise Sciences, University of Portsmouth, Portsmouth, UK.Department of Sport and Exercise Sciences, University of Portsmouth, Portsmouth, UK.Department of Sport and Exercise Sciences, University of Portsmouth, Portsmouth, UK.Department of Sport and Exercise Sciences, University of Portsmouth, Portsmouth, UK.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

26220213

Citation

Neal, R A., et al. "Effect of Short-term Heat Acclimation With Permissive Dehydration On Thermoregulation and Temperate Exercise Performance." Scandinavian Journal of Medicine & Science in Sports, vol. 26, no. 8, 2016, pp. 875-84.
Neal RA, Corbett J, Massey HC, et al. Effect of short-term heat acclimation with permissive dehydration on thermoregulation and temperate exercise performance. Scand J Med Sci Sports. 2016;26(8):875-84.
Neal, R. A., Corbett, J., Massey, H. C., & Tipton, M. J. (2016). Effect of short-term heat acclimation with permissive dehydration on thermoregulation and temperate exercise performance. Scandinavian Journal of Medicine & Science in Sports, 26(8), pp. 875-84. doi:10.1111/sms.12526.
Neal RA, et al. Effect of Short-term Heat Acclimation With Permissive Dehydration On Thermoregulation and Temperate Exercise Performance. Scand J Med Sci Sports. 2016;26(8):875-84. PubMed PMID: 26220213.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of short-term heat acclimation with permissive dehydration on thermoregulation and temperate exercise performance. AU - Neal,R A, AU - Corbett,J, AU - Massey,H C, AU - Tipton,M J, Y1 - 2015/07/29/ PY - 2015/06/21/accepted PY - 2015/7/30/entrez PY - 2015/7/30/pubmed PY - 2017/4/14/medline KW - Hydration KW - adaptation KW - athletes KW - endurance KW - hyperthermic KW - stress SP - 875 EP - 84 JF - Scandinavian journal of medicine & science in sports JO - Scand J Med Sci Sports VL - 26 IS - 8 N2 - We examined the effect of short-term heat acclimation with permissive dehydration (STHADe) on heat acclimation (HA) and cycling performance in a temperate environment. Ten trained male cyclists [mean (SD) maximal oxygen uptake: 63.3(4.0) mL/kg/min; peak power output (PPO): 385(40) W; training: 10 (3) h/week] underwent a STHADe program consisting of 5 days of exercise (maximum 90 min/day) in a hot environment (40 °C, 50% RH) to elicit isothermic heat strain [rectal temperature 38.64(0.27) °C]. Participants abstained from fluids during, and 30 min after, HA sessions. Pre- and post-STHADe HA was evaluated during euhydrated fixed-intensity exercise (60 min) in hot conditions; the effect of STHADe on thermoregulation was also examined under temperate conditions (20 min fixed-intensity exercise; 22 °C, 60% RH). Temperate cycling performance was assessed by a graded exercise test (GXT) and 20-km time trial (TT). STHADe reduced thermal and cardiovascular strain in hot and temperate environments. Lactate threshold [Δ = 16 (17) W] and GXT PPO [Δ = 6 (7) W] were improved following STHADe (P < 0.05), but TT performance was not affected (P > 0.05), although there was a trend for a higher mean power (P = 0.06). In conclusion, STHADE can reduce thermal and cardiovascular strain under hot and temperate conditions and there is some evidence of ergogenic potential for temperate exercise, but longer HA regimens may be necessary for this to meaningfully influence performance. SN - 1600-0838 UR - https://www.unboundmedicine.com/medline/citation/26220213/Effect_of_short_term_heat_acclimation_with_permissive_dehydration_on_thermoregulation_and_temperate_exercise_performance_ L2 - https://doi.org/10.1111/sms.12526 DB - PRIME DP - Unbound Medicine ER -