Time of day effects on repeated sprint ability

Zarrouk, N., Chtourou, H., Rebai, H., Hammouda, O., Souissi, N., Dogui, M. and Hug, F. (2012) Time of day effects on repeated sprint ability. International Journal of Sports Medicine, 33 12: 975-980. doi:10.1055/s-0032-1312626


Author Zarrouk, N.
Chtourou, H.
Rebai, H.
Hammouda, O.
Souissi, N.
Dogui, M.
Hug, F.
Title Time of day effects on repeated sprint ability
Journal name International Journal of Sports Medicine   Check publisher's open access policy
ISSN 0172-4622
1439-3964
Publication date 2012-12
Year available 2012
Sub-type Article (original research)
DOI 10.1055/s-0032-1312626
Volume 33
Issue 12
Start page 975
End page 980
Total pages 6
Place of publication Stuttgart, Germany
Publisher Georg Thieme Verlag
Collection year 2013
Language eng
Formatted abstract
The present study aimed at investigating the effects of time-of-day on muscle power and associated electromyographic (EMG) activity level of 4 thigh muscles during a repeated pedalling sprint exercise. After a familiarization session, 12 male subjects were asked to perform the repeated sprint ability test during 2 experimental sessions (randomized order), which were set up either at 06:00 or 18:00h. For each sprint, peak power output, percentage of peak power decrement and total work were calculated. EMG activity of vastus lateralis, rectus femoris, vastus medialis and biceps femoris muscles was recorded throughout the test and analyzed for each sprint. Total work and percentage of peak power decrement were higher in the evening than in the morning (p<0.01 and p<0.05, respectively). Likewise, peak power was significantly higher at 18:00 than 06:00h during the first 3 sprints (p<0.01 for sprint 1 and p<0.05 for sprint 2 and 3). There was no time-of-day effect for EMG activity level. The neuromuscular efficiency decreased significantly over the repeated sprint ability test at the 2 times of testing (p<0.01). Despite diurnal fluctuation in muscular power and neuromuscular fatigue during the repeated sprint ability test, EMG activity of major thigh muscles was not time-of-day dependent.
Keyword Diurnal variation
Muscle
Electromyography
Power
Neuromuscular fatigue
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Health and Rehabilitation Sciences Publications
 
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Created: Wed, 28 Aug 2013, 16:05:31 EST by Francois Hug on behalf of School of Health & Rehabilitation Sciences