title: Activity-induced GLP-1 release in lean and obese subjects.
abstract: The aim of the study was to determine whether physical activity stimulates GLP-1 release on the short-term in normal weight and in obese subjects compared to rest and, furthermore, whether modest weight loss affects GLP-1 release or sensitivity in the obese. Normal weight (n=28; 12 males, 16 females; BMI 22.9+/-1.4; age 35+/-12.7), as well as obese subjects (n=27; 21 males, 6 females; BMI 30.9+/-2.7; age 47.1+/-11.86) were tested in a resting and a physical activity condition. Obese subjects were matched over two groups for a weight loss period of 3 months. After weight loss, the tests were repeated. The area under the curve (AUC pmol/lxmin) for GLP-1 concentrations was significantly increased in the physical activity condition compared to rest in lean subjects (P=0.05) as well as in the obese subjects after weight loss (P<0.05), but not in the obese subjects before weight loss. Physical activity-stimulated GLP-1 release in lean and obese subjects after a weight loss period supports the idea of a neuroendocrine loop in addition to distal-intestinal stimulation of GLP-1 release. Modest weight loss might be effective for increasing GLP-1 sensitivity to acute stimulation.
authors.affiliation: Department of Human Biology, Maastricht University, P.O. Box 616, Nutrition and Toxicology Research Institute Maastricht (NUTRIM), 6200 MD Maastricht, The Netherlands. T.Adam@hb.unimaas.nl
authors.forename: Tanja C M
authors.initials: TC
authors.lastname: Adam
authors.forename: Margriet S
authors.initials: MS
authors.lastname: Westerterp-Plantenga
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D019540:Area Under Curve; D001481:Basal Metabolism / Q000502:physiology; D001786:Blood Glucose; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005260:Female; D005934:Glucagon / Q000097:blood*; D052216:Glucagon-Like Peptide 1; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D009765:Obesity / Q000097:blood* / Q000503:physiopathology; D010446:Peptide Fragments / Q000097:blood*; D011498:Protein Precursors / Q000097:blood*; D013851:Thinness; D015431:Weight Loss / Q000502:physiology
chemical_list: D001786:Blood Glucose; D010446:Peptide Fragments; D011498:Protein Precursors; D052216:Glucagon-Like Peptide 1; D005934:Glucagon