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Oliver R. Barley, Dale W. Chapman, Georgios Mavropalias and Chris R. Abbiss

) may impact competitive performance by impairing repeat-effort capacities, 7 combat sports–specific performance, 9 – 11 and muscular performance 8 , 12 – 13 following recovery periods of 3 to 5 hours and in some cases up to 24 hours. 7 Heat acclimation has been shown to mitigate the negative

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Matthew Zimmermann, Grant Landers, Karen Wallman and Georgina Kent

dehydration. 2 , 3 Because of this, methods of improving endurance performance in the heat have been developed. Heat acclimation (artificial environment) or heat acclimatization (natural environment) occurs when an individual trains in hot and typically humid environmental conditions for ∼60–90 minutes each

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Yasuki Sekiguchi, Erica M. Filep, Courteney L. Benjamin, Douglas J. Casa and Lindsay J. DiStefano

Clinical Scenario Exercise in the heat can lead to performance decrements and increase the risk of heat illness. 1 , 2 Heat acclimation refers to the systematic and gradual increase in exercise in a controlled, laboratory environment with hot environmental conditions and is an impactful strategy

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Samuel T. Tebeck, Jonathan D. Buckley, Clint R. Bellenger and Jamie Stanley

Short-term heat acclimation (STHA) involves repeated exposure to heat stress over the course of ∼7 days in an artificial (acclimation) or natural (acclimatization) environment. 1 STHA has received increasing interest for elite athletic preparation because it efficiently and effectively promotes

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Cyril Schmit, Rob Duffield, Christophe Hausswirth, Jeanick Brisswalter and Yann Le Meur

Heat acclimation (HA) has the capability to improve performance in the heat, potentially countering heat-induced performance decrements. 1 In general, HA is accomplished via regular exercise at submaximal intensities in environments of sufficient temperature. 2 , 3 In addition, due to the

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Michael J. Zurawlew, Jessica A. Mee and Neil P. Walsh

Prior to exercise-heat stress, athletes and military personnel are advised to complete a period of heat acclimation to alleviate heat strain and improve exercise capacity in the heat. 1 The adaptive responses that improve exercise capacity in the heat include an earlier onset and an increase in

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Thomas Reeve, Ralph Gordon, Paul B. Laursen, Jason K.W. Lee and Christopher J. Tyler

Exercise performance in the heat is often impaired due to the greater physiological strain experienced, 1 – 3 but heat acclimation/acclimatization (HA) can reduce this impairment by inducing a number of beneficial physiological (eg, reduction in cardiovascular strain, lower core body temperature

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Carl J. Petersen, Marc R. Portus, David B. Pyne, Brian T. Dawson, Matthew N. Cramer and Aaron D. Kellett

Cricketers are often required to play in hot/humid environments with little time for heat adaptation.

Purpose:

We examined the effect of a short 4-d hot/humid acclimation program on classical physiological indicators of heat acclimation.

Methods:

Male club cricketers were randomly assigned into heat acclimation (ACC, n = 6) or control (CON, n = 6) groups, and 30 min treadmill trials (10 km/h, approx. 30 ± 1.0°C, approx. 65 ± 6% RH) were conducted at baseline and postacclimation. The ACC group completed four high intensity (30–45 min) acclimation sessions on consecutive days at approx. 30°C and approx. 60% RH using a cycle ergometer. The CON group completed matched cycle training in moderate conditions (approx. 20°C, approx. 60% RH). Physiological measures during each treadmill trial included heart rate; core and skin temperatures; sweat Na+, K+ and Cl– electrolyte concentrations; and sweat rate.

Results:

After the 4-d intervention, the ACC group had a moderate decrease of -11 (3 to -24 beats/min; mean and 90% CI) in the 30 min heart rate, and moderate to large reductions in electrolyte concentrations: Na+ -18% (–4 to -31%), K+ -15% (0 to -27%), Cl– -22% (-9 to -33%). Both ACC and CON groups had only trivial changes in core and skin temperatures and sweat rate. After the intervention, both groups perceived they were more comfortable exercising in the heat. The 4-d heat intervention had no detrimental effect on performance.

Conclusions:

Four 30–45 min high intensity cycle sessions in hot/humid conditions elicited partial heat acclimation. For full heat acclimation a more intensive and extensive (and modality-specific) acclimation intervention is needed for cricket players.

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Erin L. McCleave, Katie M. Slattery, Rob Duffield, Stephen Crowcroft, Chris R. Abbiss, Lee K. Wallace and Aaron J. Coutts

acclimation in hot and temperate environments by 8% and 6%, respectively, along with improved power at lactate threshold, maximal cardiac output, and PV expansion. Despite promising results surrounding the transfer of heat adaptations to performance, 5 not all studies have reported improvements in temperate

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David N. Borg, Ian B. Stewart, John O. Osborne, Christopher Drovandi, Joseph T. Costello, Jamie Stanley and Geoffrey M. Minett

variable. Consistent with some short-term heat-training interventions, 1 there was little evidence that 5 days of cycling in 35°C (50% RH) induced acclimation (Figure  2 ; Table  2 ). As expected, cycling in the heat increased the TL response compared with the temperate environment (Figures  1 and 2