TITLE

Effect of Submaximal Aerobic Exercise at the Altitude of 3250 m on levels of Serum Cortisol, Testosterone and Testosterone to Cortisol Ratio in Active Young Men

AUTHOR(S)
Mirsepasi, Mona; Kohanpour, Mohammad Ali; Mirsepasi, Zohreh; Boostani, Mohammad Hassan; Adelifar, Arezoo
PUB. DATE
May 2013
SOURCE
Advances in Environmental Biology;May2013, Vol. 7 Issue 5, p854
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
To date, relatively few studies have been conducted concerning the function of endocrine glands in hypoxic conditions. The purpose of this study was thus to determine the response of serum cortisol, testosterone and testosterone to cortisol ratio to aerobic exercises at the altitude of 3250 m. In this study, 9 young men with an average age of 23.33±1.56 years old performed two sessions of aerobic activities including 30-min running at an intensity level of 70% of maximum heart rate in both normoxic (1200 m) and hypoxic (simulated altitude of 3250 m) conditions. Blood samples were taken before, immediately after and one hour after physical activity and, for each sample, the levels of cortisol, testosterone and their ratios were determined. In order to compare the variables at the aforementioned altitudes, the T-student test for dependent groups was used and Analysis of Variance with repeated measurement was run for investigating the variation of each variable per session. The results of this study indicated that testosterone level decreased significantly at the altitude of 3250 m (P=0.000). No significant change was observed in either of the testosterone level at the altitude of 1200 m (P=0.212), cortisol levels at both altitudes (P=0.413 and P=0.057 for 1200 and 3250 m, respectively) and testosterone to cortisol ratios at both altitudes (P=0.262 and P=0.296 for 1200 and 3250 m, respectively). Immediately and 1 hour after physical activity, testosterone level at the altitude of 3250 m was observed to be significantly lower than its corresponding level at the altitude of 1200 m (P=0.032 and P=0.010, respectively). There was also no significant difference between the levels of cortisol (P=0.651 and P=0.514 for immediately and one hour after physical activity, respectively) and testosterone to cortisol ratio (P=0.054 and P=0.116 for immediately and one hour after physical activity, respectively) of the two altitudes. It seems that, for a given duration and intensity of aerobic exercise, testosterone response in hypoxic conditions differs from that in normoxic conditions.
ACCESSION #
90474717

 

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