Racinais, S, Connes, P, Bishop, David ORCID: 0000-0002-6956-9188, Blonc, S and Hue, O (2005) Morning versus evening power output and repeated-sprint ability. Chronobiology International, 22 (6). pp. 1029-1039. ISSN 0742-0528

Abstract

We investigated the effect of time‐of‐day on both maximal sprint power and repeated‐sprint ability (RSA). Nine volunteers (22±4 yrs) performed a RSA test both in the morning (07:00 to 09:00 h) and evening (17:00 to 19:00 h) on different days in a random order. The RSA cycle test consisted of five, 6 sec maximal sprints interspersed by 24 sec of passive recovery. Both blood lactate concentration and heart rate were higher in the evening than morning RSA (lactate values post exercise: 13±3 versus 11±3 mmol/L -1, p , 0.05). The peak power developed during the first sprint was higher in the evening than morning (958±112 vs. 915±133 W, p , 0.05), but this difference was not apparent in subsequent sprints, leading to a higher power decrement across the 5 x 6 sec test in the evening (11±2 vs. 7±3%, p , 0.05). Both the total work during the RSA cycle test and the power developed during bouts 2 to 5 failed to be influenced by time-of-day. This suggests that the beneficial effect of time-of-day may be limited to a single expression of muscular power and fails to advantage performance during repeated sprints.

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