Partial heat acclimation in cricketers using a 4-day high intensity cycling protocol

Carl Petersen, Marc Portus, David Pyne, B Dawson, Matthew Cramer, Aaron Kellett

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)535-545
    Number of pages11
    JournalInternational Journal of Sports Physiology and Performance
    Volume5
    Issue number4
    DOIs
    Publication statusPublished - Dec 2010

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    Acclimatization
    Hot Temperature
    Sweat
    Skin Temperature
    Electrolytes
    Heart Rate
    Gryllidae
    Research Design

    Cite this

    Petersen, Carl ; Portus, Marc ; Pyne, David ; Dawson, B ; Cramer, Matthew ; Kellett, Aaron. / Partial heat acclimation in cricketers using a 4-day high intensity cycling protocol. In: International Journal of Sports Physiology and Performance. 2010 ; Vol. 5, No. 4. pp. 535-545.
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    title = "Partial heat acclimation in cricketers using a 4-day high intensity cycling protocol",
    abstract = "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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    Partial heat acclimation in cricketers using a 4-day high intensity cycling protocol. / Petersen, Carl; Portus, Marc; Pyne, David; Dawson, B; Cramer, Matthew; Kellett, Aaron.

    In: International Journal of Sports Physiology and Performance, Vol. 5, No. 4, 12.2010, p. 535-545.

    Research output: Contribution to journalArticle

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    AU - Portus, Marc

    AU - Pyne, David

    AU - Dawson, B

    AU - Cramer, Matthew

    AU - Kellett, Aaron

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    N2 - 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.

    AB - 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.

    KW - core temperature

    KW - skin temperature

    KW - sweat rate

    KW - heart rate

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