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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
Time-of-day effects on biochemical responses to soccer-specific endurance in elite Tunisian football players
Journal of Sports Sciences, Volume 31, No. 9, Year 2013
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Description
This study aimed to investigate footballers' diurnal variation of performance during the Yo-Yo intermittent recovery test and the associated biochemical responses. Fifteen male footballers (17.3 ± 0.3 years, 69.1 ± 4.2 kg, 179.7 ± 3.6 cm) performed two randomised Yo-Yo tests at 07:00 h and 17:00 h. Blood samples were collected before and 3 min after each test for the assessment of metabolic responses. Resting oral temperature and rating of perceived exertion (RPE) after and peak heart rate during the Yo-Yo test were recorded at both times-of-day. Core temperature and performances during the Yo-Yo test increased from the morning to the evening (P < 0.0005 and P = 0.01, respectively) without significant time-of-day effects on peak heart rate and RPE. Moreover, pre-and post-Yo-Yo test biochemical parameters (high-density lipoprotein, triglycerides, glucose, creatine-kinase) were higher at 17:00 h than 07:00 h (160.45 ± 18.68 vs. 173.73 ± 14.48 before and 191.18 ± 21.13 vs. 219.27 ± 27.74 IU · L-1 after the Yo-Yo test at 07:00 h and 17:00 h, P = 0.032 and P < 0.0005, respectively for creatine-kinase). Only post-exercise lactate levels were higher in the evening (9.82 ± 0.65 vs. 10.86 ± 0.33 mmol · L-1, P < 0.0005) with all biochemical variables being increased after the exercise (P < 0.0005). These findings suggest a possible link between the diurnal fluctuation of metabolic responses and the related pattern of specific-endurance performances in footballers. Therefore, the higher biochemical responses observed in the evening could explain, partially, the greater performance and metabolic solicitation at this time-of-day. © 2013 Copyright Taylor and Francis Group, LLC.
Authors & Co-Authors
Hammouda, Omar
Tunisia, Sfax
University of Sfax
Cthourou, Hamdi C.
Tunisia, Sfax
University of Sfax
Chaouachi, Anis
Tunisia, Sfax
University of Sfax
Chahed, Henda
Tunisia, Sousse
Hopital Farhat Hached Sousse
Bellimem, Hlima
Tunisia, Sousse
Hopital Farhat Hached Sousse
Chamari, K.
Tunisia, Sfax
University of Sfax
Tunisia, Manouba
Université de la Manouba
Souissi, Nizar
Tunisia, Sfax
University of Sfax
Tunisia, Manouba
Université de la Manouba
Statistics
Citations: 52
Authors: 7
Affiliations: 3
Identifiers
Doi:
10.1080/02640414.2012.757345
ISSN:
02640414
e-ISSN:
1466447X
Research Areas
Health System And Policy
Noncommunicable Diseases
Participants Gender
Male