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JOURNAL
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SPORTS SCIENCE &
MEDICINE
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Research
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EFFECT OF ENERGY EXPENDITURE AND TRAINING STATUS ON LEPTIN RESPONSE TO SUB-MAXIMAL CYCLING |
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Anissa Bouassida1  ,
Jean-Claude Chatard2, Karim Chamari3, Monia Zaouali1,
Youssef Feki4, Najoua Gharbi5, Abdelkarim Zbidi1
and Zouhaïr Tabka1 |
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1Laboratoire des adaptations cardio-circulatoires, respiratoires, métaboliques et hormonales à l'exercice musculaire, Faculté de Médecine Ibn El Jazzar, Sousse, Tunisie. 2Laboratoire de Physiologie Clinique et de l'Exercice, Faculté de Médecine de Saint-Etienne, Saint-Etienne, France and Aspire Academy for Sports Excellence, Doha, Qatar. 3Research Unit - ''Evaluation, Sport, Health'' National Centre of Medicine and Science in Sports (CNMSS), El Menzah, Tunisia. 4Laboratoire des Sciences de Mesures et d'Explorations Fonctionnelles, ISSEP Kef, Tunisie. 5Laboratoire d'Endocrinologie, Faculté des Sciences de Tunis, Tunisie. |
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© Journal of Sports Science and Medicine (2009) 8, 190 - 196 Search Google Scholar for Citing Articles |
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| ABSTRACT | |||
| 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. |
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