Leptin responses to short term exercise in college level male rowers.
OBJECTIVE
To investigate plasma leptin response to short term exercise in college level male rowers.


METHODS
Thirteen rowers performed a 30 minute maximal rowing ergometer test. Venous blood samples were obtained before, immediately after, and after 30 minutes of recovery. Concentrations of leptin, insulin, growth hormone, insulin-like growth factor-I (IGF-I), and IGF binding protein-3 (IGFBP-3) were measured.


RESULTS
Plasma leptin was significantly (p<0.05) decreased (from a mean (SD) of 2.7 (0.6) to 2.1 (0.8) ng/ml) and growth hormone significantly increased (from 0.6 (0.9) to 4.6 (5.4) microIU/l) immediately after the 30 minute maximal rowing exercise session (distance covered 7870.4 (443.3) m; blood lactate immediately after the test 14.9 (4.3) mmol/l). All other blood variables measured were not significantly changed as a result of the ergometer test. A positive relation was observed between the decreased plasma leptin concentration immediately after the test and the distance covered (R(2) = 0.645; p<0.05). Changes in leptin and IGF-I concentrations immediately after the test were also related (R(2) = 0.390; p<0.05). Percentage body fat explained 89.6% (p<0.05) of the variance (R(2) x 100) in basal leptin concentration. After normalisation for body fat, basal leptin was related (p<0.05) to basal insulin (r = 0.82) and training history (r = -0.60).


CONCLUSIONS
Leptin is sensitive to relatively short term intense exercise when all major muscles are involved.
Jürimäe
J
J
Institute of Sport Pedagogy and Coaching Sciences, University of Tartu, 18 Ulikooli St, Tartu 50090, Estonia. jaakj@ut.ee
Jürimäe
T
T
D000293:Adolescent; D000328:Adult; D001786:Blood Glucose / Q000032:analysis; D001823:Body Composition / Q000502:physiology; D015992:Body Mass Index; D015444:Exercise / Q000502:physiology*; D013006:Growth Hormone / Q000097:blood; D006801:Humans; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000097:blood; D007334:Insulin-Like Growth Factor I / Q000032:analysis; D020738:Leptin / Q000097:blood*; D008297:Male; D013177:Sports / Q000502:physiology; D013334:Students
D001786:Blood Glucose; D018972:Insulin-Like Growth Factor Binding Protein 3; D020738:Leptin; D007334:Insulin-Like Growth Factor I; D013006:Growth Hormone