Singh, Harbindar Jeet
(2002)
The effect of acute and chronic physical activity and net energy balance on plasma leptin concentration in young adults.
In: The effect of acute and chronic physical activity and net energy balance on plasma leptin concentration in young adults.
(Submitted)
Abstract
Leptin, a 16 amino acid product of ob gene, is thought to play an essential role in the regulation of adiposity. Physical activity forms an important tool in the management of weight regulation. The exact influence of intense physical activity on plasma leptin concentration is unknown. It is also unclear if the influence of an acute bout of physical activity on serum leptin levels is the same in active and sedentary individuals. This study
therefore investigated the effects of exercise on plasma leptin concentration in active and non-active young adults.This study investigated the effects of exercise on plasma leptin concentration in active and non-active young adults. Active subjects (n =10) consisted of the national junior football players and non-active subjects consisted of college students who did not take part in regular physical activity. The subjects were matched closely for age, race, body mass index (BMI) and % body fat. Overnight fasting blood samples were collected before and immediately after a 45-minute bout of exercise. Lipid profiles and plasma leptin levels were estimated in all blood samples. In addition, skinfold thickness measurements and dietary
records were obtained from all the subjects to estimate the% body fat and energy balance respectively.All data analysed using SPSS and are presented as mean± SEM. No statistically significant differences were found in BMI, % body fat, total energy balance, lipid profiles or plasma
leptin concentrations between the two groups. Plasma leptin concentration did not change significantly immediately following exercise although mean leptin concentrations appear to increase slightly post-exercise.In conclusion, an acute bout of exercise does not decrease plasma leptin concentration if anything there appears a trend towards a slight rise in plasma leptin. This may be a consequent of its decreased clearance during exercise.Similarly, energy intake or balance did not significantly alter plasma leptin levels in both the active and non-active young individuals. However, further studies are required to confirm these findings.
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