:: Volume 18, Issue 3 (Autumn 2016) ::
J Mil Med 2016, 18(3): 253-261 Back to browse issues page
The Effect of a Period of Selected Aerobic Training on the Response of Thyroid and Cortisol Hormones to Exhaustive Exercise in Women
Vahid Sobhani, Hossein Shirvani *
Exercise Physiology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran , Shirvani.h2006@gmail.com
Abstract:   (6963 Views)

Background and Aim: The effect of exercise training on Thyroid hormone secretion is a controversial topic. This study aimed to investigate the effect of a period of selected aerobic training on thyroxin (T4), Triiodothyronine (T3) and cortisol hormone levels in athlete and non-athlete women after exhaustive exercise sessions was performed.

Methods: In a quasi-experimental study with pre and post, among the female volunteers, 20 women whom of which qualified were randomly selected and divided into two athlete (n=10) and non-athlete (n=10) groups. Subjects of both groups did exhaustive exercise (Bruce test) before and after eight weeks of progressive aerobic training (increasing running and climbing stairs with 45 to 85% of maximum heart rate and 3 times in a week). Blood samples were collected immediately after each session of exhaustive exercise and analyzed with a specific kit of the hormone and radio-immunoassay method. In order to compare the means, the paired t-test and one-way analysis of variance followed by Tukey’s test was performed.

Results: Results indicated that following eight weeks of aerobic training in the athletes group, the T3 (P=0.01) and T4 (P=0.002) hormones’ levels in response to exhaustive activity significantly increased but these changes were not significant in non-athletes. On the other hand, the amounts of cortisol in response to this activity significantly decreased in both groups (P =0.04).

Conclusion: Overall, results showed that regular aerobic exercise training can adjust cortisol response to physical stress in female athletes and non-athletes. This is while no considerable effect was seen on thyroid hormone levels T3 and T4.

Keywords: Progressive aerobic training, Exhaustive exercise, Thyroxine, Triiodothyronine, Athletes, Non-athletes, Cortisol
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Type of Study: Orginal Research | Subject: military medcine
Received: 2016/11/7 | Accepted: 2016/12/6 | Published: 2017/01/10

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Volume 18, Issue 3 (Autumn 2016) Back to browse issues page