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Heat acclimation improves intermittent sprinting in the heat but additional pre-cooling offers no further ergogenic effect.
J Sports Sci. 2011 Aug; 29(11):1125-34.JS

Abstract

The aim of this study was to determine the effect of 10 days of heat acclimation with and without pre-cooling on intermittent sprint exercise performance in the heat. Eight males completed three intermittent cycling sprint protocols before and after 10 days of heat acclimation. Before acclimation, one sprint protocol was conducted in control conditions (21.8 ± 2.2°C, 42.8 ± 6.7% relative humidity) and two sprint protocols in hot, humid conditions (33.3 ± 0.6°C, 52.2 ± 6.8% relative humidity) in a randomized order. One hot, humid condition was preceded by 20 min of thigh pre-cooling with ice packs (-16.2 ± 4.5°C). After heat acclimation, the two hot, humid sprint protocols were repeated. Before heat acclimation, peak power output declined in the heat (P < 0.05) but pre-cooling prevented this. Ten days of heat acclimation reduced resting rectal temperature from 37.8 ± 0.3°C to 37.4 ± 0.3°C (P < 0.01). When acclimated, peak power output increased by ∼2% (P < 0.05, main effect) and no reductions in individual sprint peak power output were observed. Additional pre-cooling offered no further ergogenic effect. Unacclimated athletes competing in the heat should pre-cool to prevent reductions in peak power output, but heat acclimate for an increased peak power output.

Authors+Show Affiliations

Department of Sport and Exercise Science, University of Bedfordshire, Bedford, UK. paul.castle@beds.ac.ukNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

21777052

Citation

Castle, Paul, et al. "Heat Acclimation Improves Intermittent Sprinting in the Heat but Additional Pre-cooling Offers No Further Ergogenic Effect." Journal of Sports Sciences, vol. 29, no. 11, 2011, pp. 1125-34.
Castle P, Mackenzie RW, Maxwell N, et al. Heat acclimation improves intermittent sprinting in the heat but additional pre-cooling offers no further ergogenic effect. J Sports Sci. 2011;29(11):1125-34.
Castle, P., Mackenzie, R. W., Maxwell, N., Webborn, A. D., & Watt, P. W. (2011). Heat acclimation improves intermittent sprinting in the heat but additional pre-cooling offers no further ergogenic effect. Journal of Sports Sciences, 29(11), 1125-34. https://doi.org/10.1080/02640414.2011.583673
Castle P, et al. Heat Acclimation Improves Intermittent Sprinting in the Heat but Additional Pre-cooling Offers No Further Ergogenic Effect. J Sports Sci. 2011;29(11):1125-34. PubMed PMID: 21777052.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Heat acclimation improves intermittent sprinting in the heat but additional pre-cooling offers no further ergogenic effect. AU - Castle,Paul, AU - Mackenzie,Richard W, AU - Maxwell,Neil, AU - Webborn,Anthony D J, AU - Watt,Peter W, Y1 - 2011/07/21/ PY - 2011/7/23/entrez PY - 2011/7/23/pubmed PY - 2012/2/10/medline SP - 1125 EP - 34 JF - Journal of sports sciences JO - J Sports Sci VL - 29 IS - 11 N2 - The aim of this study was to determine the effect of 10 days of heat acclimation with and without pre-cooling on intermittent sprint exercise performance in the heat. Eight males completed three intermittent cycling sprint protocols before and after 10 days of heat acclimation. Before acclimation, one sprint protocol was conducted in control conditions (21.8 ± 2.2°C, 42.8 ± 6.7% relative humidity) and two sprint protocols in hot, humid conditions (33.3 ± 0.6°C, 52.2 ± 6.8% relative humidity) in a randomized order. One hot, humid condition was preceded by 20 min of thigh pre-cooling with ice packs (-16.2 ± 4.5°C). After heat acclimation, the two hot, humid sprint protocols were repeated. Before heat acclimation, peak power output declined in the heat (P < 0.05) but pre-cooling prevented this. Ten days of heat acclimation reduced resting rectal temperature from 37.8 ± 0.3°C to 37.4 ± 0.3°C (P < 0.01). When acclimated, peak power output increased by ∼2% (P < 0.05, main effect) and no reductions in individual sprint peak power output were observed. Additional pre-cooling offered no further ergogenic effect. Unacclimated athletes competing in the heat should pre-cool to prevent reductions in peak power output, but heat acclimate for an increased peak power output. SN - 1466-447X UR - https://www.unboundmedicine.com/medline/citation/21777052/Heat_acclimation_improves_intermittent_sprinting_in_the_heat_but_additional_pre_cooling_offers_no_further_ergogenic_effect_ L2 - http://www.tandfonline.com/doi/full/10.1080/02640414.2011.583673 DB - PRIME DP - Unbound Medicine ER -