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Area of Science:

  • Exercise Physiology
  • Endocrinology
  • Sports Science

Background:

  • Prolactin is a hormone with diverse functions, including roles in metabolism and immunity.
  • The impact of prolonged endurance exercise on prolactin levels requires further characterization.

Purpose of the Study:

  • To investigate the blood prolactin response during and after a 90-minute endurance exercise session.
  • To compare prolactin levels during exercise with those during a resting control period.

Main Methods:

  • Six healthy, trained males participated in a 90-minute cycling exercise (70% VO2max) and a rest-control session.
  • Blood samples were collected at multiple time points (-15 to 120 minutes) during both sessions.
  • Prolactin concentrations were measured using radioimmunoassay and analyzed with ANOVA.

Main Results:

  • Blood prolactin concentrations significantly increased from 45 to 120 minutes during exercise compared to pre-exercise levels (p < 0.01).
  • Exercise-induced prolactin levels were approximately 300% higher than those observed during the rest-control period (p < 0.01).

Conclusions:

  • Prolonged endurance exercise elicits a substantial and sustained elevation in blood prolactin.
  • This prolactin response may be involved in signaling energy utilization or modulating immune function during strenuous physical activity.