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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 (P peak) and mean (P mean) powers were recorded.

Results

During the Wingate test, P peak and P mean 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 …