Original Research
Physiological and performance benefits of halftime cooling

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This study examined the effect of a 10-min, halftime cooling application on physiological and psychological parameters known to affect performance. Fourteen volunteers (10 male, 4 female) completed two randomised trials 48 hr to 7 days apart. Trials consisted of a 1-hr cycling protocol: 30 min at 75% V̇O2max followed by 10 min cooling (application of a cooling jacket) or passive recovery (control), and a second 30-min exercise bout consisting of 20 min at 75% V̇O2max, immediately followed by a 10-min maximal effort, where work was measured as energy expended (kJ). Performance of the 10-min maximal intensity phase tended to improve (171.5±30.4 kJ vs 165.4±29.2 kJ, p= 0.087) following the cooling trial. Heart rate during the 5th min of the maximal effort, (183±9 beats.min−1 vs 180±7 beats.min−1, p= 0.024), blood lactate concentration at 6 min post-exercise (9.3±3.1 mmol·L−1 vs 7.9±3.2 mmol·L-1, p= 0.007), rating of perceived exertion at the 20th min post-halftime recovery (15±2 vs 16±2, p= 0.042), and subjective rating of feelings and emotions differed between the cooling and control conditions. Sweat loss, core and mean skin temperature and rating of thermal sensation failed to differ significantly between conditions. Halftime cooling tended to result in greater aerobic performance. Psychological assessment revealed a dramatic placebo effect from the cooling application confounding these results. Furthermore, the cooling intervention failed to induce any significant thermoregulatory effects.

References (20)

  • YatesK et al.

    Pre-cooling rowers can improve laboratory 2000m performance in hot-humid conditions

  • BoothJ et al.

    Improved running performance in hot humid conditions following whole body precooling

    Med Sci Sports Exerc

    (1997)
  • SawkaMN et al.

    Physiologic tolerance to uncompensable heat: intermittent exercise, field v's laboratory

    Med Sci Sports Exerc

    (2001)
  • DrustB et al.

    Investigation of the effects of the pre-cooling on the physiological responses to soccer-specific intermittent exercise

    Euro J Appl Physiol

    (2000)
  • HessemerV et al.

    Effect of slightly lowered body temperatures on endurance performance in humans

    J Appl Physiol

    (1984)
  • MitchellJB et al.

    The influence of different external cooling methods on thermoregulatory responses before and after intense intermittent exercise in the heat

    J Strength Cond Res

    (2001)
  • TonerMM et al.

    Perceptual and physiological responses during exercise in cool and cold water

    Percept Mot Skills

    (1986)
  • HeisingM et al.

    Control of sweating in man after work-induced thermal load and symmetrically applied cooling

    Euro J Appl Physiol

    (1987)
  • OlschewiskiH et al.

    Thermoregulatory, cardiovascular, and muscular factors related to exercise after precooling

    J Appl Physiol

    (1988)
  • GordonNF et al.

    Effect of a practical neck cooling device on core temperature during exercise

    Med Sci Sports Exerc

    (1990)
There are more references available in the full text version of this article.

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