Partial Heat Acclimation in Cricketers Using a 4-Day High Intensity Cycling Protocol

Click name to view affiliation

Carl J. Petersen
Search for other papers by Carl J. Petersen in
Current site
Google Scholar
PubMed
Close
,
Marc R. Portus
Search for other papers by Marc R. Portus in
Current site
Google Scholar
PubMed
Close
,
David B. Pyne
Search for other papers by David B. Pyne in
Current site
Google Scholar
PubMed
Close
,
Brian T. Dawson
Search for other papers by Brian T. Dawson in
Current site
Google Scholar
PubMed
Close
,
Matthew N. Cramer
Search for other papers by Matthew N. Cramer in
Current site
Google Scholar
PubMed
Close
, and
Aaron D. Kellett
Search for other papers by Aaron D. Kellett in
Current site
Google Scholar
PubMed
Close
Restricted access

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.

Carl J. Petersen is with the Sport Science Sport Medicine Unit, Cricket Australia Centre of Excellence; the Department of Physiology, Australian Institute of Sport; and the Department of Sports Science, Exercise and Health, University of Western Australia.Marc R. Portus is with the Sport Science Sport Medicine Unit, Cricket Australia Centre of Excellence.David B. Pyne is with the Department of Physiology, Australian Institute of Sport. Brian T. Dawson is with the Department of Sports Science, Exercise and Health, University of Western Australia.Matthew N. Cramer is with the Department of Physiology, Australian Institute of Sport. Aaron D. Kellett is with the Sport Science Sport Medicine Unit, Cricket Australia Centre of Excellence.

  • Collapse
  • Expand