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Independent or Simultaneous Lowering of Core and Skin Temperature Has no Impact on Self‑paced Intermittent Running Performance in Hot Conditions

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Thomas, Gavin ORCID: https://orcid.org/0000-0002-4662-1588, Cullen, Tom, Davies, Matthew, Hetherton, Connor, Duncan, Benedict and Gerrett, N. (2019) Independent or Simultaneous Lowering of Core and Skin Temperature Has no Impact on Self‑paced Intermittent Running Performance in Hot Conditions. European Journal of Applied Physiology, 119 (8). pp. 1841-1853. ISSN Print: 1439-6319 Online: 1439-6327

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Official URL: https://link.springer.com/article/10.1007/s00421-0...

Abstract

Purpose To investigate the effects of lowering core (Tgi) and mean skin temperature (Tsk) concomitantly and independently on self-paced intermittent running in the heat.
Methods 10 males (30.5 ± 5.8 years, 73.2 ± 14.5 kg, 176.9 ± 8.0 cm, 56.2 ± 6.6 ml/kg/min) completed four randomised
46-min self-paced intermittent protocols on a non-motorised treadmill in 34.4 ± 1.4 °C, 36.3 ± 4.6% relative humidity. 30-min
prior to exercise, participants were cooled via either ice slurry ingestion (INT); a cooling garment (EXT); mixed-cooling (ice slurry and cooling garment concurrently) (MIX); or no-cooling (CON).
Results At the end of pre-cooling and the start of exercise Tgi were lower during MIX (36.11 ± 1.3 °C) compared to CON (37.6 ± 0.5 °C) and EXT (36.9 ± 0.5 °C, p < 0.05). Throughout pre-cooling Tsk and thermal sensation were lower in MIX compared to CON and INT, but not EXT (p < 0.05). The reductions in thermophysiological responses diminished within 10–20 min of exercise. Despite lowering Tgi, Tsk, body temperature (Tb), and thermal sensation prior to exercise, the distances covered were similar (CON: 6.69 ± 1.08 km, INT: 6.96 ± 0.81 km, EXT: 6.76 ± 0.65 km, MIX 6.87 ± 0.70 km) (p > 0.05). Peak
sprint speeds were also similar between conditions (CON: 25.6 ± 4.48 km/h, INT: 25.4 ± 3.6 km/h, EXT: 26.0 ± 4.94 km/h, MIX: 25.6 ± 3.58 km/h) (p > 0.05). Blood lactate, heart rate and RPE were similar between conditions (p > 0.05).
Conclusion Lowering Tgi and Tsk prior to self-paced intermittent exercise did not improve sprint, or submaximal running performance.

Item Type:	Article
Additional Information:	This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The full-text of the online published article can be accessed via the Official URL.
Uncontrolled Discrete Keywords:	thermoregulation, performance, teams ports, self-pacing, pre-cooling, intermittent exercise
Subjects:	Q Science > Q Science (General) Q Science > QP Physiology
Divisions:	College of Business, Psychology and Sport > School of Sport and Exercise Science
Related URLs:	https://static-content.springer.com/esm/... https://link.springer.com/ http://creativecommons.org/licenses/by/4...
Copyright Info:	Open Access article
Depositing User:	Gavin Thomas
Date Deposited:	26 Jun 2019 11:21
Last Modified:	22 Jun 2020 09:29
URI:	https://worc-9.eprints-hosting.org/id/eprint/8250

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