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Related Experiment Videos

Exercise thermoregulation and hyperprolactinaemia.

David Low1, Tim Cable, Alison Purvis

  • 1Institute for Exercise and Environmental Medicine, Dallas, TX 75231-5129, USA. davidlow@texashealth.org

Ergonomics
|December 13, 2005
PubMed
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Prolactin (PRL) levels correlate with core body temperature and other thermoregulatory factors during prolonged exercise. This study reveals PRL

Area of Science:

  • Exercise Physiology
  • Neuroendocrinology
  • Thermoregulation

Background:

  • Prolactin (PRL) is an anterior pituitary hormone linked to central nervous system activity.
  • PRL is a known marker of central fatigue during heat exposure and correlates with core temperature during exercise.
  • The relationship between PRL and other thermoregulatory variables during exercise remains under-investigated.

Purpose of the Study:

  • To investigate the relationship between prolactin (PRL) and key thermoregulatory variables during prolonged exercise.
  • To determine if PRL correlates with mean skin temperature, mean body temperature, heat storage, thermal gradient, heart rate, and skin blood flow.
  • To extend the understanding of PRL's role in physiological responses to exercise stress.

Main Methods:

Related Experiment Videos

  • Nine active males completed three exercise trials at different ambient temperatures (Cold, Neutral, Hot).
  • Exercise involved prolonged cycling at approximately 60% VO(2peak) for 45 minutes.
  • Measurements included core temperature, skin temperature, heart rate, skin blood flow, and blood prolactin levels.

    • Main Results:

    • Significant differences in thermoregulatory variables were observed across environmental conditions.
    • Core temperature, heart rate, and prolactin levels were significantly elevated in the Hot condition.
    • Moderate to strong correlations were found between post-exercise prolactin and core temperature, skin temperature, mean body temperature, heat storage, thermal gradient, heart rate, and skin blood flow.

    Conclusions:

    • Prolactin release during prolonged exercise is associated with core temperature, especially when core temperature exceeds 38.0°C.
    • Significant relationships exist between prolactin and multiple thermoregulatory variables, including skin temperature, mean body temperature, heat storage, thermal gradient, heart rate, and skin blood flow.
    • These findings suggest a link between PRL, thermoregulatory responses, and central serotonergic/dopaminergic activity during exercise.