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Continuous and intermittent heat acclimation and decay in team sport athletes.
Eur J Sport Sci. 2019 Apr; 19(3):295-304.EJ

Abstract

The aim of this study was to compare the impact of continuous (CON) and intermittent (INT) heat acclimation protocols on repeat-sprint performance, and to also assess the degree of performance decay following acclimation. Using a pair-matched, between subjects design, 16 trained male team sport athletes were allocated to either INT (8 sessions over 15 days) or CON acclimation (8 sessions over 8 days) groups. Participants performed a heat tolerance test (HTT) involving 60-min of repeat-sprint cycling with a 10-min half time break (in 35.3 ± 0.7°C, 60.1 ± 4.0%; RH) two days pre- (pre-HTT) and post-acclimation (post-HTT1). Decay was investigated with two further HTT's completed over the next two weeks (post-HTT2 and post-HTT3). Results showed the post-HTT1 performance variables [mean power (pre-HTT; INT = 1002.07 ± 173.74, CON = 1057.10 ± 180.07 / post-HTT1; INT = 1097.11 ± 186.85, CON = 1163.77 ± 184.65 W), mean power (W.kg-1), total work (kJ) and work (J.kg-1)] were greater than pre-HHT (p < 0.001) after acclimation, with no differences between INT and CON. No differences in final core and mean skin temperatures or heart rate existed after INT or CON acclimation, however 30 min measures for thermal sensation, perceived thirst and ratings of perceived exertion (as well as the final measure) were lower in post-HTT1 (p < 0.05) in CON. Performance and thermoregulatory responses in post-HTT2 and 3 were similar to post-HTT1 in both INT and CON. These results indicate that prolonged repeat-sprint exercise in the heat is improved after acclimation involving short, high-intensity cycling sessions using either CON or INT protocols, with performance well-maintained over the subsequent 2 weeks, despite removal of the heat stimulus.

Authors+Show Affiliations

a School of Human Sciences (Exercise and Sport Science) , The University of Western Australia , Crawley , Western Australia.a School of Human Sciences (Exercise and Sport Science) , The University of Western Australia , Crawley , Western Australia.a School of Human Sciences (Exercise and Sport Science) , The University of Western Australia , Crawley , Western Australia.a School of Human Sciences (Exercise and Sport Science) , The University of Western Australia , Crawley , Western Australia. b Western Australian Institute of Sport , Mt Claremont , Western Australia.

Pub Type(s)

Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

30176216

Citation

Duvnjak-Zaknich, Daniel M., et al. "Continuous and Intermittent Heat Acclimation and Decay in Team Sport Athletes." European Journal of Sport Science, vol. 19, no. 3, 2019, pp. 295-304.
Duvnjak-Zaknich DM, Wallman KE, Dawson BT, et al. Continuous and intermittent heat acclimation and decay in team sport athletes. Eur J Sport Sci. 2019;19(3):295-304.
Duvnjak-Zaknich, D. M., Wallman, K. E., Dawson, B. T., & Peeling, P. (2019). Continuous and intermittent heat acclimation and decay in team sport athletes. European Journal of Sport Science, 19(3), 295-304. https://doi.org/10.1080/17461391.2018.1512653
Duvnjak-Zaknich DM, et al. Continuous and Intermittent Heat Acclimation and Decay in Team Sport Athletes. Eur J Sport Sci. 2019;19(3):295-304. PubMed PMID: 30176216.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Continuous and intermittent heat acclimation and decay in team sport athletes. AU - Duvnjak-Zaknich,Daniel M, AU - Wallman,Karen E, AU - Dawson,Brian T, AU - Peeling,Peter, Y1 - 2018/09/03/ PY - 2018/9/4/pubmed PY - 2019/3/30/medline PY - 2018/9/4/entrez KW - Heat tolerance KW - heat perception KW - repeat sprint exercise KW - thermal strain SP - 295 EP - 304 JF - European journal of sport science JO - Eur J Sport Sci VL - 19 IS - 3 N2 - The aim of this study was to compare the impact of continuous (CON) and intermittent (INT) heat acclimation protocols on repeat-sprint performance, and to also assess the degree of performance decay following acclimation. Using a pair-matched, between subjects design, 16 trained male team sport athletes were allocated to either INT (8 sessions over 15 days) or CON acclimation (8 sessions over 8 days) groups. Participants performed a heat tolerance test (HTT) involving 60-min of repeat-sprint cycling with a 10-min half time break (in 35.3 ± 0.7°C, 60.1 ± 4.0%; RH) two days pre- (pre-HTT) and post-acclimation (post-HTT1). Decay was investigated with two further HTT's completed over the next two weeks (post-HTT2 and post-HTT3). Results showed the post-HTT1 performance variables [mean power (pre-HTT; INT = 1002.07 ± 173.74, CON = 1057.10 ± 180.07 / post-HTT1; INT = 1097.11 ± 186.85, CON = 1163.77 ± 184.65 W), mean power (W.kg-1), total work (kJ) and work (J.kg-1)] were greater than pre-HHT (p < 0.001) after acclimation, with no differences between INT and CON. No differences in final core and mean skin temperatures or heart rate existed after INT or CON acclimation, however 30 min measures for thermal sensation, perceived thirst and ratings of perceived exertion (as well as the final measure) were lower in post-HTT1 (p < 0.05) in CON. Performance and thermoregulatory responses in post-HTT2 and 3 were similar to post-HTT1 in both INT and CON. These results indicate that prolonged repeat-sprint exercise in the heat is improved after acclimation involving short, high-intensity cycling sessions using either CON or INT protocols, with performance well-maintained over the subsequent 2 weeks, despite removal of the heat stimulus. SN - 1536-7290 UR - https://www.unboundmedicine.com/medline/citation/30176216/Continuous_and_intermittent_heat_acclimation_and_decay_in_team_sport_athletes_ L2 - http://www.tandfonline.com/doi/full/10.1080/17461391.2018.1512653 DB - PRIME DP - Unbound Medicine ER -