Endocrine Abstracts

Aims: The effects of physical exercise on the endocrine system were monitored.

Material and method: The study included 60 young and healthy subjects.

The subjects were divided into two groups:

– group A (30) performed anaerobic exercise for 50 minutes: running on the treadmill at a speed of 8 km/hour, walking on the treadmill at a speed of 5 km/hour, and running on the treadmill at a speed of 8 km/hour;

– group B (30) performed aerobic exercise for 50 minutes: running on the treadmill at a speed of 15 km/hour, walking on the treadmill at a speed of 5 km/hour, and running on the treadmill at a speed of 15 km/hour.

All the studied subjects underwent the measurement of GH, PRL, cortisolemia, cathecolamines, insulinemia, estradiol before exercise, at the end of exercise, at one hour, 6 hours and 24 hours after exercise.

Results: During physical activity, a significant increase of GH in both groups occurred; the values remained high at one hour after exercise.

PRL increased during physical training proportionally to the difficulty of training in all the studied women, and returned to its initial value after the cessation of training.

Cortisol varied proportionally to the intensity of training. Physical exercise determined an increase of catecholamine secretion; the response was more marked for noradrenaline.We found a significant depression of insulin;estradiol secretion increased significantly in both groups of women;the values remained high at 24hours after cessation of physical training.

Conclusion: The imbalance between energy consumption and the much higher energy expenditure causes the onset of neuroendocrine mechanisms of adaptation of the body to increased physical exercise.