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Morning versus evening power output and repeated-sprint ability

Racinais, S, Connes, P, Bishop, David, 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

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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.

Item Type: Article
Additional Information:

Online ISSN: 1525-6073

Uncontrolled Keywords: ResPubID22156. circadian rhythm, anaerobic exercise, repeated sprints, repeated sprint ability, sprint power, physical performance, sprinting, time-of-day
Subjects: Historical > Faculty/School/Research Centre/Department > Institute of Sport, Exercise and Active Living (ISEAL)
Current > FOR Classification > 1106 Human Movement and Sports Science
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Depositing User: VUIR
Date Deposited: 03 Feb 2012 01:26
Last Modified: 06 Jan 2014 03:40
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Citations in Scopus: 69 - View on Scopus

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