Research Letter

Stress hormones and physical activity

Editorial Office
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie | Vol 10, No 2 | a495 | DOI: https://doi.org/10.4102/satnt.v10i2.495 | © 1991 Editorial Office | This work is licensed under CC Attribution 4.0
Submitted: 08 July 1991 | Published: 08 July 1991

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Editorial Office,, South Africa

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Abstract

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.

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