The effect of time of day on short-term maximal performance in obese and non-obese young men |
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Authors: | Makrem Zghibi Wissam Ben Khlifa Najmeddine Werghi Okba Selmi |
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Institution: | 1. Research Unit, Sportive Performance &2. Physical Rehabilitation (S2PR) (UR13JS01), University Campus of Boulifa, Le Kef, Tunisia;3. High Institute of Sports and Physical Education, Kef, University of Jendouba, Tunisia The university campus of Boulifa, Le Kef, Tunisia;4. Research Unit, High Institute of Sport and Physical Education, Sfax University, sfaxTunisia |
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Abstract: | The purpose of this study was to examine time-of-day effects on short-term performance in obese young men. In a balanced study design, 30 boys were divided into two groups: obese (OG; n = 15) and non-obese (CG; n = 15) groups. Both groups performed anaerobic tests of strength and power (squat-Jump, SJ; counter-movement jump, CMJ; 10-m sprint; and 30-m sprint) at 08:00 and 17:00 h on separate days. The results showed morning–evening differences in all variables in CG, with significant increases at 17:00 h (around the time of peak temperature) in comparison with 08:00 h (p < 0.01) for OG. However, such morning-evening differences were not found in the OG, except for the 30-m sprint. Obesity affects the diurnal variation on performances of 30-m sprint with a significant decrease in the evening for OG of 1.23% (p < 0.01). A correlation between anaerobic performance and oral temperature was observed only in the 30-m sprint test. In conclusion, the findings of the present study indicated that obesity is a problem that can affect circadian rhythms and performance in obese young men; therefore, preventing childhood obesity should become a top priority in efforts to improve performance and health. |
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Keywords: | Obesity diurnal variation exercise |
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