其他摘要：Introduction Daily rhythm as one of the biological rhythms with a period of about 24 hours on various body systems and physiological responses affect on them. Body temperature is a fundamental variable as one of the specifications used daily rhythms The main purpose of this study was evaluating the effect of circadian rhythms on exercise performing and physiological variants of security system in swimmers. Materials and Methods In one study, before and after the 12 men swimmers in the league, of Fars Province with an average age of 19.80+1.87 years, had been invited, and after explaining the situation and also completed a written consent form purposefully participated in the study. To measure the length of 400m and 50 meters breast stroke timer QQ model CR2032 (China) was used. The one-way analysis of variance (ANOVA) was used to this study. Result Results showed body temperature significantly increased from 6:00 to 18:00. Circadian rhythms significantly showed increase from 6 to 18 (P
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