Brief heat training does not improve the lactate threshold in mild conditions

Chalmers, Samuel, Esterman, Adrian, Eston, Roger, and Norton, Kevin (2016) Brief heat training does not improve the lactate threshold in mild conditions. International Journal of Sports Physiology and Performance, 11 (8). pp. 1029-1037.

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Athletes often seek the minimum required time that might elicit a physiological or performance change. It is reasonable to suggest that heat training may improve aerobic-based performance in mild conditions. Therefore, rather than providing a traditional heat exposure stimulus (i.e. 7-10 x 60-100 min sessions), the current paper details two studies that aimed to determine the effect of brief (≤240 min of exposure) heat training upon the second lactate threshold in mild conditions.


Forty-one participants completed five (Study 1; n=18) or four (Study 2; n=23) perceptually-regulated treadmill exercise training sessions in 35 ° and 30% relative humidity (experimental group) or 19 °C and 30% relative humidity (control group) conditions. Pre- and post-incremental exercise testing occurred in mild conditions (19 ° C and 30% relative humidity). Linear mixed effects models analysed the change in LT2.


Heat training did not substantially change LT2 in either Study 1 (+1.2%, d=0.38, p=0.248) or Study 2 (+1.9%, d=0.42, p=0.163). The LT2 was not substantially changed in the control group in Study 1 (+1.3%, d=0.43, p=0.193), but a within-group change was evident in Study 2 (+2.3 %, d=1.04, p=0.001).


The studies indicated that brief heat training was inadequate to improve the speed at LT2 in mild conditions to a greater extent than comparable training in mild conditions. The brief nature of the heat training protocol did not allow adaptations to develop to the extent required to potentially confer a performance advantage in an environment that is less thermally stressful than the training conditions

Item ID: 46172
Item Type: Article (Research - C1)
ISSN: 1555-0273
Keywords: acclimation; hot; perceived exertion; performance; running
Date Deposited: 31 Jan 2017 03:40
FoR Codes: 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420702 Exercise physiology @ 100%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920499 Public Health (excl. Specific Population Health) not elsewhere classified @ 100%
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