Stress hormones and physical activity

• Main Author: Editorial Office
• Format: Article
• Language: Afrikaans
• Published: South African Journal of Science and Technology 1991-07-01
• Series: South African Journal of Science and Technology
• Online Access: http://www.satnt.ac.za/index.php/satnt/article/view/495

Hormone secretion during physical activity of specific duration and intensity is part of the stress response. In a study to investigate the secretion of ß-endorphin, leucine enkephalin and other recognised stress hormones during physical exercise, blood samples were taken from fourteen (14) healthy, male athletes who competed in a 21 km roadrace. Blood samples were collected before and after completion of the race. This study shows that ß-endorphin/ß-lipotropin, leucine enkephalin, prolactin, and melatonin may be classified as stress hormones in physical activity of duration 80 to 120 minutes and intensity exceeding 75%-V0₂max. Widespread intra-individual variation in serum cortisol concentrations prevent definite conclusion. The un­expected increase in serum testosterone levels warrants further research.