Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
from September 2014
©Journal of Sports Science and Medicine (2009) 08, 190 - 196

Research article
Effect of Energy Expenditure and Training Status on Leptin Response to Sub-Maximal Cycling
Anissa Bouassida1, , Jean-Claude Chatard2, Karim Chamari3, Monia Zaouali1, Youssef Feki4, Najoua Gharbi5, Abdelkarim Zbidi1, Zouhaïr Tabka1
Author Information
1 Faculté de Médecine Ibn El Jazzar, Sousse, Tunisie
2 France and Aspire Academy for Sports Excellence, Doha, Qatar
3 National Centre of Medicine and Science in Sports (CNMSS), El Menzah, Tunisia
4 ISSEP Kef, Tunisie
5 Faculté des Sciences de Tunis, Tunisie

Anissa Bouassida
✉ Laboratoire de Physiologie, Faculté de Médecine Ibn El Jazzar, avenue Mohamed Karoui 4002, Sousse, Tunisie.
Publish Date
Received: 18-04-2008
Accepted: 28-10-2008
Published (online): 01-06-2009
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We examined the leptin response and related hormones during and after two sub-maximal exercise protocols in trained and untrained subjects. During this study, plasma concentrations of leptin [Lep], insulin [I], cortisol [C], growth hormone [GH], glucose [G] and lactate [La] were measured. 7 elite volleyball trained players (TR) and 7 untrained (UTR) subjects (percent body fat: 13.2 ± 1.8 versus 15.7 ± 1.0, p < 0.01, respectively) were examined after short and prolonged sub-maximal cycling exercise protocols (SP and PP). Venous blood samples were collected before each protocol, during, at the end, and after 2 and 24 h of recovery. SP and PP energy expenditures ranged from 470 ± 60 to 740 ± 90 kcal for TR and from 450 ± 60 to 710 ± 90 kcal for UTR, respectively. [Lep] was related to body fat percentage and body fat mass in TR (r = 0. 84, p < 0.05 and r = 0.93, p < 0.01) and in UTR (r = 0.89, p < 0.01 and r = 0.92, p < 0. 01, respectively). [Lep] did not change significantly during both protocols for both groups but was lower (p < 0.05) in all sampling in TR when compared to UTR. Plasma [I] decreased (p < 0.01) and [GH] increased (p < 0.01) significantly during both SP and PP and these hormones remained lower (I: p < 0.01) and higher (GH: p < 0.01) than pre-exercise levels after a 2-h recovery period, returning to base-line at 24-h recovery. Plasma [La] increased (p < 0.01) during both protocols for TR and UTR. There was no significant change in [C] and [G] during and after both protocols for all subjects. It is concluded that 1) leptin is not sensitive to acute short or prolonged sub-maximal exercises (with energy expenditure under 800 kcal) in volleyball/ anaerobically trained athletes as in untrained subjects, 2) volleyball athletes showed significantly lower resting and exercise leptin response with respect to untrained subjects and 3) it appears that in these anaerobically trained athletes leptin response to exercise is more sensitive to the level of energy expenditure than hormonal or metabolic modifications induced by acute exercise.

Key words: Hormones, anaerobic training, acute exercise, body fat.

           Key Points
  • Trials concerning acute exercise and leptin indicated discrepant results.
  • Acute exercise with energy expenditure higher than 800 kcal can decrease leptinemia.
  • Elite volleyball players presented decreased leptin levels than untrained subjects.
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