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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Diurnal variations of plasma homocysteine, total antioxidant status, and biological markers of muscle injury during repeated sprint: Effect on performance and muscle fatiguea pilot study
Chronobiology International, Volume 28, No. 10, Year 2011
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Description
The aim of this study was (i) to evaluate whether homocysteine (Hcy), total antioxidant status (TAS), and biological markers of muscle injury would be affected by time of day (TOD) in football players and (ii) to establish a relationship between diurnal variation of these biomarkers and the daytime rhythm of power and muscle fatigue during repeated sprint ability (RSA) exercise. In counterbalanced order, 12 football (soccer) players performed an RSA test (5×[6 s of maximal cycling sprint+24 s of rest]) on two different occasions: 07:0008:30h and 17:0018:30h. Fasting blood samples were collected from a forearm vein before and 35min after each RSA test. Core temperature, rating of perceived exertion, and performances (i.e., Sprint 1, Sprint 2, and power decrease) during the RSA test were significantly higher at 17:00 than 07:00h (p<.001, p<.05, and p<.05, respectively). The results also showed significant diurnal variation of resting Hcy levels and all biological markers of muscle injury with acrophases (peak times) observed at 17:00h. These fluctuations persisted after the RSA test. However, biomarkers of antioxidant status' resting levels (i.e., total antioxidant status, uric acid, and total bilirubin) were higher in the morning. This TOD effect was suppressed after exercise for TAS and uric acid. In conclusion, the present study confirms diurnal variation of Hcy, selected biological markers of cellular damage, and antioxidant status in young football players. Also, the higher performances and muscle fatigue showed in the evening during RSA exercise might be due to higher levels of biological markers of muscle injury and lower antioxidant status at this TOD. © Informa Healthcare USA, Inc.
Authors & Co-Authors
Hammouda, Omar
Tunisia, Tunis
République Tunisienne Ministère de la Jeunesse, Des Sports et de L'éducation Physique
Tunisia, Sfax
University of Sfax
Cthourou, Hamdi C.
Tunisia, Tunis
République Tunisienne Ministère de la Jeunesse, Des Sports et de L'éducation Physique
Chahed, Henda
Tunisia, Sousse
Hopital Farhat Hached Sousse
Ferchichi, Salima
Tunisia, Sousse
Hopital Farhat Hached Sousse
Kallel, Choumous H.
Tunisia, Sfax
Chu Habib Bourguiba
Miled, Abdelhédi
Tunisia, Sousse
Hopital Farhat Hached Sousse
Chamari, K.
Tunisia, Tunis
République Tunisienne Ministère de la Jeunesse, Des Sports et de L'éducation Physique
Souissi, Nizar
Tunisia, Tunis
République Tunisienne Ministère de la Jeunesse, Des Sports et de L'éducation Physique
Tunisia, Manouba
Université de la Manouba
Statistics
Citations: 88
Authors: 8
Affiliations: 5
Identifiers
Doi:
10.3109/07420528.2011.613683
ISSN:
07420528
e-ISSN:
15256073
Research Areas
Health System And Policy
Violence And Injury