The effects of lower body passive heating combined with mixed-method cooling during half-time on second-half intermittent sprint performance in the heat
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This study examined the effects of combined cooling and lower body heat maintenance during half-time on second-half intermittent sprint performances.
In a repeated measures design, nine males completed four intermittent cycling trials (32.1 ± 0.3 °C and 55.3 ± 3.7% relative humidity), with either one of the following half-time recovery interventions; mixed-method cooling (ice vest, ice slushy and hand cooling; COOL), lower body passive heating (HEAT), combined HEAT and COOL (COMB) and control (CON). Peak and mean power output (PPO and MPO), rectal (Tre), estimated muscle (Tes-Mus) and skin (TSK) temperatures were monitored throughout exercise.
During half-time, the decrease in Tre was substantially greater in COOL and COMB compared with CON and HEAT, whereas declines in Tes-Mus within HEAT and COMB were substantially attenuated compared with CON and COOL. The decrease in TSK was most pronounced in COOL compared with CON, HEAT and COMB. During second-half, COMB and HEAT resulted in a larger decrease in PPO and MPO during the initial stages of the second-half when compared to CON. In addition, COOL resulted in an attenuated decrease in PPO and MPO compared to COMB in the latter stages of second-half.
The maintenance of Tes-Mus following half-time was detrimental to prolonged intermittent sprint performance in the heat, even when used together with cooling.
KeywordsIntermittent sprint performance Mixed-method cooling Passive heating Half-time intervention Team sports
Mean power output
Combined upper body cooling and lower body passive heating
Upper body cooling
Lower body passive heating
Peak power output
Rating of perceived exertion
Estimated muscle temperature
Mean skin temperature
Peak oxygen uptake
MI, GT, AR and SA conceived and designed the research. MI, GT, JP and JS conducted the study. MI and JS analysed the data and wrote the manuscript. All the authors read and approved the manuscript.
No sources of funding were acquired for this study.
Compliance with ethical standards:
Conflict of interests
The authors have no conflict of interests.
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