Effect of wearing an ice cooling jacket on repeat sprint performance in warm/humid conditions.

Rob Duffield, Brian Dawson, David Bishop, Martin Fitzsimons, Steve Lawrence

    Research output: Contribution to journalArticle

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    Abstract

    Objective-The purpose of this study was to examine the effect of cooling the skin with an ice jacket before and between exercise bouts (to simulate quarter and half time breaks) on prolonged repeat sprint exercise performance in warm/humid conditions. Methods- After an initial familiarisation session, seven trained male hockey players, performed two testing sessions (seven days apart), comprising an 80 min intermittent, repeat sprint cycling exercise protocol inside a climate chamber set at 30oC and 60% relative humidity. On one occasion a skin cooling procedure was implemented (in random counterbalanced order), with subjects wearing an ice cooling jacket both before (for 5min), and in the recovery periods (2x 5min and 1x 10min) during the test. Measures of performance (work done and power output on each sprint), heart rates, blood lactate concentrations, core (rectal) and skin temperatures, sweat loss, perceived exertion, ratings of thirst, thermal discomfort and fatigue were obtained in both trials.Results- In the cooling condition, chest (torso) skin temperature, thermal discomfort and rating of thirst were all significantly lower (p<0.05), but no statistical significance (p>0.05) was observed between conditions for measures of work done, power output, heart rate, blood lactate concentration, core or mean skin temperature, perceived exertion, sweat loss, or ratings of fatigue. However, high effect sizes indicated trends for lowered lactate concentrations, sweat losses and mean skin temperatures in the cooling condition. Conclusions- In the present study the intermittent use of an ice cooling jacket, both before and during a repeat sprint cycling protocol in warm/humid conditions did not improve physical performance, although the perception of thermal load was reduced. Longer periods of cooling both prior to and during exercise (to lower mean skin temperature by a greater degree than observed here) may be necessary to produce such a change.
    Original languageEnglish
    Pages (from-to)164-169
    Number of pages6
    JournalBritish Journal of Sports Medicine
    Volume37
    Issue number2
    DOIs
    Publication statusPublished - 2003

    Fingerprint

    Skin Temperature
    Ice
    Sweat
    Thirst
    Lactic Acid
    Hot Temperature
    Fatigue
    Heart Rate
    Hockey
    Torso
    Skin
    Humidity
    Climate
    Thorax

    Cite this

    Duffield, Rob ; Dawson, Brian ; Bishop, David ; Fitzsimons, Martin ; Lawrence, Steve. / Effect of wearing an ice cooling jacket on repeat sprint performance in warm/humid conditions. In: British Journal of Sports Medicine. 2003 ; Vol. 37, No. 2. pp. 164-169.
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    title = "Effect of wearing an ice cooling jacket on repeat sprint performance in warm/humid conditions.",
    abstract = "Objective-The purpose of this study was to examine the effect of cooling the skin with an ice jacket before and between exercise bouts (to simulate quarter and half time breaks) on prolonged repeat sprint exercise performance in warm/humid conditions. Methods- After an initial familiarisation session, seven trained male hockey players, performed two testing sessions (seven days apart), comprising an 80 min intermittent, repeat sprint cycling exercise protocol inside a climate chamber set at 30oC and 60{\%} relative humidity. On one occasion a skin cooling procedure was implemented (in random counterbalanced order), with subjects wearing an ice cooling jacket both before (for 5min), and in the recovery periods (2x 5min and 1x 10min) during the test. Measures of performance (work done and power output on each sprint), heart rates, blood lactate concentrations, core (rectal) and skin temperatures, sweat loss, perceived exertion, ratings of thirst, thermal discomfort and fatigue were obtained in both trials.Results- In the cooling condition, chest (torso) skin temperature, thermal discomfort and rating of thirst were all significantly lower (p<0.05), but no statistical significance (p>0.05) was observed between conditions for measures of work done, power output, heart rate, blood lactate concentration, core or mean skin temperature, perceived exertion, sweat loss, or ratings of fatigue. However, high effect sizes indicated trends for lowered lactate concentrations, sweat losses and mean skin temperatures in the cooling condition. Conclusions- In the present study the intermittent use of an ice cooling jacket, both before and during a repeat sprint cycling protocol in warm/humid conditions did not improve physical performance, although the perception of thermal load was reduced. Longer periods of cooling both prior to and during exercise (to lower mean skin temperature by a greater degree than observed here) may be necessary to produce such a change.",
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    Effect of wearing an ice cooling jacket on repeat sprint performance in warm/humid conditions. / Duffield, Rob; Dawson, Brian; Bishop, David; Fitzsimons, Martin; Lawrence, Steve.

    In: British Journal of Sports Medicine, Vol. 37, No. 2, 2003, p. 164-169.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Effect of wearing an ice cooling jacket on repeat sprint performance in warm/humid conditions.

    AU - Duffield, Rob

    AU - Dawson, Brian

    AU - Bishop, David

    AU - Fitzsimons, Martin

    AU - Lawrence, Steve

    N1 - Imported on 12 Apr 2017 - DigiTool details were: Journal title (773t) = British Journal of Sports Medicine. ISSNs: 0306-3674;

    PY - 2003

    Y1 - 2003

    N2 - Objective-The purpose of this study was to examine the effect of cooling the skin with an ice jacket before and between exercise bouts (to simulate quarter and half time breaks) on prolonged repeat sprint exercise performance in warm/humid conditions. Methods- After an initial familiarisation session, seven trained male hockey players, performed two testing sessions (seven days apart), comprising an 80 min intermittent, repeat sprint cycling exercise protocol inside a climate chamber set at 30oC and 60% relative humidity. On one occasion a skin cooling procedure was implemented (in random counterbalanced order), with subjects wearing an ice cooling jacket both before (for 5min), and in the recovery periods (2x 5min and 1x 10min) during the test. Measures of performance (work done and power output on each sprint), heart rates, blood lactate concentrations, core (rectal) and skin temperatures, sweat loss, perceived exertion, ratings of thirst, thermal discomfort and fatigue were obtained in both trials.Results- In the cooling condition, chest (torso) skin temperature, thermal discomfort and rating of thirst were all significantly lower (p<0.05), but no statistical significance (p>0.05) was observed between conditions for measures of work done, power output, heart rate, blood lactate concentration, core or mean skin temperature, perceived exertion, sweat loss, or ratings of fatigue. However, high effect sizes indicated trends for lowered lactate concentrations, sweat losses and mean skin temperatures in the cooling condition. Conclusions- In the present study the intermittent use of an ice cooling jacket, both before and during a repeat sprint cycling protocol in warm/humid conditions did not improve physical performance, although the perception of thermal load was reduced. Longer periods of cooling both prior to and during exercise (to lower mean skin temperature by a greater degree than observed here) may be necessary to produce such a change.

    AB - Objective-The purpose of this study was to examine the effect of cooling the skin with an ice jacket before and between exercise bouts (to simulate quarter and half time breaks) on prolonged repeat sprint exercise performance in warm/humid conditions. Methods- After an initial familiarisation session, seven trained male hockey players, performed two testing sessions (seven days apart), comprising an 80 min intermittent, repeat sprint cycling exercise protocol inside a climate chamber set at 30oC and 60% relative humidity. On one occasion a skin cooling procedure was implemented (in random counterbalanced order), with subjects wearing an ice cooling jacket both before (for 5min), and in the recovery periods (2x 5min and 1x 10min) during the test. Measures of performance (work done and power output on each sprint), heart rates, blood lactate concentrations, core (rectal) and skin temperatures, sweat loss, perceived exertion, ratings of thirst, thermal discomfort and fatigue were obtained in both trials.Results- In the cooling condition, chest (torso) skin temperature, thermal discomfort and rating of thirst were all significantly lower (p<0.05), but no statistical significance (p>0.05) was observed between conditions for measures of work done, power output, heart rate, blood lactate concentration, core or mean skin temperature, perceived exertion, sweat loss, or ratings of fatigue. However, high effect sizes indicated trends for lowered lactate concentrations, sweat losses and mean skin temperatures in the cooling condition. Conclusions- In the present study the intermittent use of an ice cooling jacket, both before and during a repeat sprint cycling protocol in warm/humid conditions did not improve physical performance, although the perception of thermal load was reduced. Longer periods of cooling both prior to and during exercise (to lower mean skin temperature by a greater degree than observed here) may be necessary to produce such a change.

    KW - Open access version available

    KW - Core temperature

    KW - Ice jacket

    KW - Multiple sprints

    KW - Precooling

    KW - Skin temperature

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    DO - 10.1136/bjsm.37.2.164

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    SP - 164

    EP - 169

    JO - British Journal of Sports Medicine

    JF - British Journal of Sports Medicine

    SN - 0306-3674

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    ER -