Premium
Responses of sex steroid hormones to different intensities of exercise in endurance athletes
Author(s) -
Sato Koji,
Iemitsu Motoyuki,
Katayama Keisho,
Ishida Koji,
Kanao Yoji,
Saito Mitsuru
Publication year - 2015
Publication title -
experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0958-0670
DOI - 10.1113/ep085361
Subject(s) - testosterone (patch) , hormone , athletes , medicine , endocrinology , sex steroid , endurance training , vo2 max , sprint , sex hormone binding globulin , physical exercise , free testosterone , dehydroepiandrosterone , steroid , androgen , physical therapy , heart rate , blood pressure
New FindingsWhat is the central question of this study? What is the effect of different exercise intensities on sex steroid hormone concentrations in individuals with different degrees of physical fitness?What is the main finding and its importance? In endurance athletes, serum concentrations of sex steroid hormones increased only with high‐intensity exercise. Moreover, different responses of sex steroid hormone secretions were induced by different exercise intensities in individuals with low and high levels of physical fitness.Previous studies have shown that acute exercise elevates sex steroid hormone concentrations in rodents and that sprint exercise increases circulating testosterone in healthy young men. However, the effect of different exercise intensities on sex steroid hormone responses at different levels of physical fitness is still unclear. In this study, we compared circulating sex steroid hormone responses at different exercise intensities in athletes and non‐athletes. Eight male endurance athletes and 11 non‐athletes performed two 15 min sessions of submaximal exercise at 40 and 70% peak oxygen uptake ( V ̇O 2 peak), respectively, and exercised at 90%V ̇O 2 peakuntil exhaustion. Venous blood samples were collected during the last minute of each submaximal exercise session and immediately after exhaustion. Acute exercise at 40, 70 and 90%V ̇O 2 peakinduced significant increases in serum dehydroepiandrosterone (DHEA) and free testosterone concentrations in non‐athletes. On the contrary, only 90%V ̇O 2 peakexercise led to an increase in serum DHEA and free testosterone concentrations in athletes. Serum 5α‐dihydrotestosterone concentrations increased with 90%V ̇O 2 peakexercise in both athletes and non‐athletes. Additionally, serum estradiol concentrations were significantly increased at moderate and high exercise intensities in both athletes and non‐athletes. These results indicate that in endurance athletes, serum sex steroid hormone concentrations, especially serum DHEA and 5α‐dihydrotestosterone concentrations, increased only with high‐intensity exercise, suggesting that different responses of sex steroid hormone secretion are induced by different exercise intensities in individuals with low and high levels of physical fitness. In athletes, therefore, high‐intensity exercise may be required to increase circulating sex steroid hormone concentrations.