Regulation of appetite in lean and obese adolescents after exercise: role of acylated and desacyl ghrelin
| Autor: | Dariush Elahi, K. J. MacKelvie, Susan I. Barr, Jean-Pierre Chanoine, Graydon S. Meneilly, Alfred C. K. Wong |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Blood Glucose
Male medicine.medical_specialty Adolescent Endocrinology Diabetes and Metabolism media_common.quotation_subject Acylation Peptide Hormones Clinical Biochemistry Appetite Physical exercise Overweight Biochemistry Endocrinology Weight loss Internal medicine medicine Aerobic exercise Humans Insulin Testosterone Obesity Exercise physiology Insulin-Like Growth Factor I Exercise media_common business.industry Biochemistry (medical) Body Weight Fasting Ghrelin medicine.symptom business Body mass index |
| Zdroj: | The Journal of clinical endocrinology and metabolism. 92(2) |
| ISSN: | 0021-972X |
| Popis: | Increased physical activity is an integral part of weight loss programs in adolescents. We hypothesized that exercise could affect appetite-regulating hormones and the subjective desire to eat, which could partly explain the poor success rate of the existing interventions.The objective of this study was to investigate prospectively the effects of exercise on acylated ghrelin (AG) and desacyl ghrelin (DG) concentrations and on appetite.The setting for this study was a tertiary care center.Normal-weight [NW; body mass index (mean +/- se), 20.7 +/- 0.5 kg/m2] and overweight (OW; body mass index, 32.4 +/- 1.7) male adolescents (n = 17/group, age 15.3 +/- 0.2 yr) were studied.Those studied participated in 5 consecutive days of aerobic exercise (1 h/d).Changes in AG and DG concentrations and in appetite during a test meal were studied.Exercise did not significantly affect insulin sensitivity or body weight. Fasting total (AG and DG) ghrelin concentrations were lower in OW (600 +/- 33 pg/ml) compared with NW (764 +/- 33 pg/ml, P0.05) boys and were not affected by exercise. In contrast, there was a differential effect of exercise on both AG and DG (Por= 0.019). AG significantly increased after exercise, and this increase was greater in NW compared with OW adolescents (P0.05). Higher AG concentrations were correlated with an increase in markers of appetite (P0.05).Exercise differentially affects AG and DG in NW and OW male adolescents. Our data suggest that total ghrelin does not adequately reflect AG and DG concentrations and that the influence of exercise-induced hormonal changes should be considered to ensure success in weight management. |
| Databáze: | OpenAIRE |
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