ملخص الجهاز:
"c o m ISSN (Online): 2322-4479 Received: 07/12/2012 Accepted: 22/01/2013 Annals of Applied Sport Science 1(1): 1 – 5, 2013 The Effect of a Single Session of Moderate and Heavy Intensity Weight-lifting Exercise on Plasma Testosterone and Cortisol in Elite Male Weight-lifters 1Abbass Rahimi, 2Seyed Morteza Tayebi 1- Faculty of Physical Education and Sport Sciences, Neka Branch, Islamic Azad University, Neka, Mazandaran, Iran.
A similar decrease in cortisol response has been reported by Fry et al (1993) in academic elite weightlifter after a week of high-volume resistance training (13).
Another study conducted by Kramer et al (1996) showed that response properties of beta-endorphin, ACTH, and cortisol are highly depended on intensity of exercise in response to a given protocol of heavy resistance training (5, 14).
Kramer et al (1998) also observed a significant decrease in cortisol levels after the first session of a heavy resistance training protocol in three consecutive days (5).
In addition, the objective this study was to evaluate the effect of a session of weightlifting training with moderate and heavy intensities on changes in serum testosterone and cortisol and also the ratio of testosterone to cortisol.
Although in most reports it has been mentioned that resistance trainings significantly increase testosterone concentration in men (19), attributed to some reasons such as decrease in plasma volume, adrenergic stimulations (20), release of stimulated lactate (6), potential adaptations of testosterone synthesis, and secretory capacity of Leydig cells in testes (16), training sessions with moderate and heavy intensities has no significant impact on testosterone levels in the present study."