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Indexed/Abstracted in: BIOSIS Previews, EMBASE, Scopus, Emerging Sources Citation Index
Online ISSN 1827-1812
Lakhdar N. 1, Ben Saad H. 2, Denguezli M. 1, Benaissa N. 1, Zaouali M. 1, Zbidi A. 1, Tabka Z. 1, Bouassida A. 1
1 Laboratory of Cardio-Circulatory, Respiratory, Metabolic and Hormonal Adaptations to Muscular Exercise, Faculty of Medicine Ibn El Jazzar, Sousse, Tunisia;
2 Department of Physiology, Hospital of Farhat Hached, Sousse, Tunisia
Aim: The purpose of this investigation was to analyse the effect of intense cycling training for six months on plasma concentrations of adiponectin, leptin and insulin.
Methods: Eight trained males (elite cyclists) and nine untrained subjects participated in this study. Both groups completed two times maximal progressive exercises. These exercises were separated by six months heavy cycling training for trained and by 6 months rest for untrained subjects. Blood samples were obtained before exercise, at the end and after 30 and 60 minutes of recovery.
Results: Before training, adiponectin concentrations were not significantly altered after maximal exercise for both groups. Plasma leptin levels decreased significantly in trained subjects at the end of exercise (-21.42%, P <0.01) and after 60 min of recovery (-21.18%, P <0.05). After training, the trained subjects exhibited a delayed increase of adiponectin concentrations (after 30 min of recovery) (8.67%, P <0.01) and a decreased control leptin concentrations (-44.91%, P <0.05). Both protocols were accompanied by a hypoinsulinemia.
Conclusion: Our results showed that six months of heavy cycling training promote the production of adiponectin and decrease the synthesis of leptin.