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Does short-duration heat exposure at a matched cardiovascular intensity improve intermittent running performance in a cool environment?

Citation

Philp, CP and Buchheit, M and Kitic, CM and Minson, CT and Fell, JW, Does short-duration heat exposure at a matched cardiovascular intensity improve intermittent running performance in a cool environment?, International Journal of Sports Physiology and Performance, 12, (6) pp. 812-818. ISSN 1555-0265 (2017) [Refereed Article]


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Copyright 2017 Human Kinetics, Inc.

DOI: doi:10.1123/ijspp.2016-0072

Abstract

Purpose: To investigate whether a five-day cycling training block in the heat (35C) in Australian rules footballers was superior to exercising at the same relative intensity in cool conditions (15C) for improving intermittent running performance in a cool environment (<18C).

Methods: Using a parallel-group design, 12 semiprofessional football players performed 5 d of cycling exercise (70% heart-rate reserve [HRR] for 45 min [5 50-min sessions in total]) in a hot (HEAT, 35C 1C, 56% 9% RH) or cool environment (COOL, 15C 3C, 81% 10% RH). A 30-15 Intermittent Fitness Test to assess intermittent running performance (VIFT) was conducted in a cool environment (17C 2C, 58 5% RH) before and twice after (1 and 3 d) the intervention.

Results: There was a likely small increase in VIFT in each group (HEAT, 0.5 0.3 km/h, 1.5 0.8 smallest worthwhile change [SWC]; COOL, 0.4 0.4 km/h, 1.6 1.2 SWC) 3 d post-intervention, with no difference in change between the groups (0.5% 1.9%, 0.4 1.4 SWC). Cycle power output during the intervention was almost certainly lower in the HEAT group (HEAT 1.8 0.2 W/kg vs COOL 2.5 0.3 W/kg, 21.7 3.2 SWC, 100/0/0).

Conclusions: This study indicates that when cardiovascular exercise intensity is matched (i.e. 70% HRR) between environmental conditions, there is no additional performance benefit from short-duration moderate-intensity heat exposure (5 x 50 min) for semi-professional footballers exercising in cool conditions. However, the similar positive adaptations may occur in the HEAT with 30% lower mechanical load, which may be of interest for load management during intense training or rehabilitation phases.

Item Details

Item Type:Refereed Article
Keywords:heat exposure, Austalian Rules Football
Research Division:Medical and Health Sciences
Research Group:Human Movement and Sports Science
Research Field:Human Movement and Sports Science not elsewhere classified
Objective Division:Health
Objective Group:Specific Population Health (excl. Indigenous Health)
Objective Field:Specific Population Health (excl. Indigenous Health) not elsewhere classified
Author:Philp, CP (Mr Calvin Philp)
Author:Kitic, CM (Dr Cecilia Kitic)
Author:Fell, JW (Associate Professor James Fell)
ID Code:112212
Year Published:2017 (online first 2016)
Web of Science® Times Cited:1
Deposited By:Health Sciences
Deposited On:2016-10-31
Last Modified:2018-02-07
Downloads:39 View Download Statistics

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