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Int J Sports Med 2012; 33(02): 142-147
DOI: 10.1055/s-0031-1286251
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

The Effect of Time-of-Day and Ramadan Fasting on Anaerobic Performances

H. Chtourou
1   Research Laboratory “Sports performance Optimization”, National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
,
O. Hammouda
1   Research Laboratory “Sports performance Optimization”, National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
,
A. Chaouachi
2   Research Unit, High Institute of Sport and Physical Education, Sfax, Tunisia, High Institute of Sport and Physical Education, University, Ksar-Saïd, Manouba, Tunisia
,
K. Chamari
1   Research Laboratory “Sports performance Optimization”, National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
,
N. Souissi
1   Research Laboratory “Sports performance Optimization”, National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
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accepted after revision 27. Juli 2011

Publikationsdatum:
08. Februar 2012 (online)

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Abstract

This study was designed to assess the effects of Ramadan-intermittent-fasting (RIF) and time-of-day on muscle power and fatigue during the Wingate test. In a randomized design, 10 football players completed a Wingate test at 07:00 and 17:00 h on 3 different occasions: one week before Ramadan (BR), the second week of Ramadan (SWR) and the fourth week of Ramadan (ER). There was an interval of 36-h between any 2 successive tests. During the Wingate test, peak power (PP), mean power (MP) and the fatigue index (FI) were recorded. While PP, MP and FI were greater in the evening than in the morning during BR (p<0.001), these diurnal variations in muscle power disappeared during the month of Ramadan (i. e., SWR and ER) due to a significant decrease in PP and MP in the evening (p<0.001). However, the diurnal variation in FI when measured at 17:00 h increased during this month (p<0.001). In addition, ratings of perceived exertion and fatigue were higher in the evening during Ramadan in comparison with BR. These results suggest that Ramadan might modify the circadian rhythm of muscle power and fatigue during the Wingate test by decreasing power output and increasing muscle fatigue at the time of the acrophase.

Key words

Ramadan fasting - anaerobic exercise - fatigue - diurnal variation - footballers
 

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