Diurnal variation in stroke parameters and motor organization in front-crawl swimmers

The aim of the present study was to examine the effects of time of day on stroke parameters and motor organization in front-crawl swimmers. In a randomized order, fourteen regional swimmers (age: 18.7 ± 1.6 years) performed maximal front crawls over 12.5 m during two experimental sessions; the morni...

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Bibliographic Details
Published in:Biological rhythm research 2015-11, Vol.46 (6), p.887-895
Main Authors: Ferchichi, Salah, Taktak, Heni, Taktak, Yana, Zarrouk, Fayçal, Tabka, Zouhair, Souissi, Nizar
Format: Article
Language:English
Subjects:
biological rhythms
cameras
circadian
diurnal variation
motor organization
stroke parameters
swimming
temperature
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Summary:The aim of the present study was to examine the effects of time of day on stroke parameters and motor organization in front-crawl swimmers. In a randomized order, fourteen regional swimmers (age: 18.7 ± 1.6 years) performed maximal front crawls over 12.5 m during two experimental sessions; the morning sessions were conducted between 07:00 and 09:00 h and the evening experiments were conducted between 17:00 and 19:00 h. Stroke parameters (swim velocity, stroke rate [SR], and stroke length), motor organization (arm stroke phases and arm coordination) were calculated from aerial and underwater side-view cameras. Arm coordination was quantified in terms of an index of coordination (Idc). Results showed that oral temperature was significantly higher in the evening 36.8 ± 0.2 °C than in the morning 36.1 ± 0.2 °C (p
ISSN:1744-4179
0929-1016
1744-4179
DOI:10.1080/09291016.2015.1060679