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Asian J Sports Med. Sep 2012; 3(3): 139–144.
PMCID: PMC3445640
Diurnal Variations in Physical Performances Related to Football in Young Soccer Players
Hamdi Chtourou, PhD,1,2* Omar Hammouda, PhD,1 Hichem Souissi, PhD,1 Karim Chamari, PhD,1,3 Anis Chaouachi, PhD,1 and Nizar Souissi, PhD1,3
1Research Laboratory “Sports performance Optimization” National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
2Research Unit, High Institute of Sport and Physical Education, Sfax University, Tunisia
3High Institute of Sport and Physical Education, Ksar-Saïd, Manouba University, Tunisia
*Corresponding Author:Address: National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia. Bp263, Ave Med Ali Akid, 1004 El Menzah, Tunis, Tunisia. E-mail:h_chtourou/at/yahoo.fr
Received January 9, 2012; Accepted April 13, 2012.
Abstract
Purpose
This study investigated the effects of time-of-day on aerobic and anaerobic performances during the Yo-Yo, repeated sprint ability (RSA) and the Wingate tests in young soccer players.
Methods
In a counterbalanced and a random order, twenty junior male soccer players completed the Yo-Yo, the RSA, and the Wingate tests at two different times-of-day: 07:00 and 17:00 h. During the Yo-Yo test, the total distance (TD) covered and the estimated maximal aerobic velocity (MAV) were determined. The peak power (PP) during each sprint, the percentage of decrement of PP (PD) and total work (Wtotal) during the RSA test were, also, measured. In addition, during the Wingate test, the peak (Ppeak) and mean (Pmean) powers were recorded.
Results
During the Wingate test, Ppeak and Pmean were significantly higher at 17:00 than 07:00 h (P<0.05) with diurnal gains of 3.1±3.6 and 2.9±3.5% respectively. During the RSA test, PP during the first two sprints, Pdec and Wtotal were, also, higher in the evening (P<0.05) with amplitudes of 4.8±4.6, 3.1±3.0, 13.1±32.1, and 4.1±2.5% respectively. Likewise, TD and MAV during the Yo-Yo test were higher at 17:00 than 07:00 h with diurnal gains of 13.1±10.7 and 4.2±3.3 respectively.
Conclusions
The present study confirms the daily variations of both aerobic and anaerobic performances during the Yo-Yo, the RSA, and the Wingate tests in trained young Tunisian soccer players.
Keywords: Circadian Rhythm, Soccer Players, Aerobic Exercises, Anaerobic Exercises
Les articles de Asian Journal of Sports Medicine ont été offerts à titre gracieux par
Tehran University of Medical Sciences.