The Effect of Heavy Resistance Exercise on Circadian Rhythm of Salivary Cortisol in Male Body Building Athletes

Background: The aim of the present study was to evaluate the effect of heavy resistance exercise on the circadian rhythm of salivary cortisol in male body building athletes. Methods: In this balanced, crossover study, 15 healthy resistance-trained men (mean age, weight and height: 21.45 ± 1.10 years...

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Main Authors: Ardalan Shariat, Mehdi Kargarfard, Gholam Reza Sharifi
Format: Article
Language:fas
Published: Vesnu Publications 2012-02-01
Series:مجله دانشکده پزشکی اصفهان
Subjects:
Online Access:http://jims.mui.ac.ir/index.php/jims/article/view/1391
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spelling doaj-e2a4b7fd1aa444ef86112557d84049222020-11-24T20:43:06ZfasVesnu Publications مجله دانشکده پزشکی اصفهان1027-75951735-854X2012-02-012916724002412834The Effect of Heavy Resistance Exercise on Circadian Rhythm of Salivary Cortisol in Male Body Building AthletesArdalan Shariat0Mehdi Kargarfard1Gholam Reza Sharifi2School of Physical Education and Sport Sciences, Khorasgan Branch, Islamic Azad University, Isfahan, IraAssociate Professor, Department of Sport Physiology, School of Physical Education and Sport Sciences, Isfahan University, Isfahan, IranAssistant Professor, School of Physical Education and Sport Sciences, Khorasgan Branch, Islamic Azad University, Isfahan, IranBackground: The aim of the present study was to evaluate the effect of heavy resistance exercise on the circadian rhythm of salivary cortisol in male body building athletes. Methods: In this balanced, crossover study, 15 healthy resistance-trained men (mean age, weight and height: 21.45 ± 1.10 years, 76.50 ± 4.20 kg, and 178.30 ± 3.60 cm, respectively) with three years of previous experience in resistance exercise were selected. At the time of study, the subjects were involved in a resistance training program of at least three sessions per week. The testing period included two test days per week, incorporating a total of two days of "rest" and two days of "exercise". Subjects were randomly selected to participate on the "rest" and "exercise" days. The heavy resistance exercise protocol consisted of three, ten-repetition sets using 75% of one repetition maximum (1RM). Saliva samples were obtained every two hours for a maximum of 16 hours during each testing day. The repeated measures analysis of variance (ANOVA) was followed by post-hoc LSD test. The significance level was considered as P ≤ 0.05. Findings: There was a significant increase in the level of salivary cortisol immediately after the heavy resistance exercise session (P ≤ 0.05). There were no significant differences between the exercise and control days in circadian rhythm of salivary cortisol (P ≥ 0.05).  Conclusion: This study showed that heavy resistance exercise had a significant effect on cortisol release immediately post exercise, but did not significantly affect the waking circadian rhythm in male body building athleteshttp://jims.mui.ac.ir/index.php/jims/article/view/1391Resistance exerciseCircadian rhythmSalivary cortisol
collection DOAJ
language fas
format Article
sources DOAJ
author Ardalan Shariat
Mehdi Kargarfard
Gholam Reza Sharifi
spellingShingle Ardalan Shariat
Mehdi Kargarfard
Gholam Reza Sharifi
The Effect of Heavy Resistance Exercise on Circadian Rhythm of Salivary Cortisol in Male Body Building Athletes
مجله دانشکده پزشکی اصفهان
Resistance exercise
Circadian rhythm
Salivary cortisol
author_facet Ardalan Shariat
Mehdi Kargarfard
Gholam Reza Sharifi
author_sort Ardalan Shariat
title The Effect of Heavy Resistance Exercise on Circadian Rhythm of Salivary Cortisol in Male Body Building Athletes
title_short The Effect of Heavy Resistance Exercise on Circadian Rhythm of Salivary Cortisol in Male Body Building Athletes
title_full The Effect of Heavy Resistance Exercise on Circadian Rhythm of Salivary Cortisol in Male Body Building Athletes
title_fullStr The Effect of Heavy Resistance Exercise on Circadian Rhythm of Salivary Cortisol in Male Body Building Athletes
title_full_unstemmed The Effect of Heavy Resistance Exercise on Circadian Rhythm of Salivary Cortisol in Male Body Building Athletes
title_sort effect of heavy resistance exercise on circadian rhythm of salivary cortisol in male body building athletes
publisher Vesnu Publications
series مجله دانشکده پزشکی اصفهان
issn 1027-7595
1735-854X
publishDate 2012-02-01
description Background: The aim of the present study was to evaluate the effect of heavy resistance exercise on the circadian rhythm of salivary cortisol in male body building athletes. Methods: In this balanced, crossover study, 15 healthy resistance-trained men (mean age, weight and height: 21.45 ± 1.10 years, 76.50 ± 4.20 kg, and 178.30 ± 3.60 cm, respectively) with three years of previous experience in resistance exercise were selected. At the time of study, the subjects were involved in a resistance training program of at least three sessions per week. The testing period included two test days per week, incorporating a total of two days of "rest" and two days of "exercise". Subjects were randomly selected to participate on the "rest" and "exercise" days. The heavy resistance exercise protocol consisted of three, ten-repetition sets using 75% of one repetition maximum (1RM). Saliva samples were obtained every two hours for a maximum of 16 hours during each testing day. The repeated measures analysis of variance (ANOVA) was followed by post-hoc LSD test. The significance level was considered as P ≤ 0.05. Findings: There was a significant increase in the level of salivary cortisol immediately after the heavy resistance exercise session (P ≤ 0.05). There were no significant differences between the exercise and control days in circadian rhythm of salivary cortisol (P ≥ 0.05).  Conclusion: This study showed that heavy resistance exercise had a significant effect on cortisol release immediately post exercise, but did not significantly affect the waking circadian rhythm in male body building athletes
topic Resistance exercise
Circadian rhythm
Salivary cortisol
url http://jims.mui.ac.ir/index.php/jims/article/view/1391
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