title: Abdominal obesity, muscle composition, and insulin resistance in premenopausal women.
abstract: The independent relationships between visceral and abdominal sc adipose tissue (AT) depots, muscle composition, and insulin sensitivity were examined in 40 abdominally obese, premenopausal women. Measurements included glucose disposal by euglycemic clamp, muscle composition by computed tomography, abdominal and nonabdominal (e.g. leg) AT by magnetic resonance imaging and cardiovascular fitness. Glucose disposal rates were negatively related to visceral AT mass (r = -0.42, P < 0.01). These observations remained significant (P < 0.01) after control for nonabdominal and abdominal sc AT, muscle attenuation, and peak oxygen uptake. Total, abdominal, or leg sc AT or muscle attenuation was not significantly (P > 0.10) related to glucose disposal. Subdivision of abdominal sc AT into anterior and posterior depots did not alter the observed relationships. Further analysis matched two groups of women for abdominal sc AT but with low and high visceral AT. Women with high visceral AT had lower glucose disposal rates compared with those with low visceral AT (P < 0.05). A similar analysis performed on two groups of women matched for visceral AT but high and low abdominal sc AT revealed no statistically different values for insulin sensitivity (P > 0.10). In conclusion, visceral AT alone is a strong correlate of insulin resistance independent of nonabdominal, abdominal sc AT, muscle composition, and cardiovascular fitness. Subdivision of abdominal sc AT did not provide additional insight into the relationship between abdominal obesity and metabolic risk.
authors.affiliation: Department of Medicine, Division of Endocrinology and Metabolism, School of Physical and Health Education, Queen's University, Kingston, Ontario, Canada K7L 3N6. rossr@post.queensu.ca
authors.forename: Robert
authors.initials: R
authors.lastname: Ross
authors.forename: Jennifer
authors.initials: J
authors.lastname: Freeman
authors.forename: Robert
authors.initials: R
authors.lastname: Hudson
authors.forename: Ian
authors.initials: I
authors.lastname: Janssen
mesh_terms: D000005:Abdomen; D000328:Adult; D001786:Blood Glucose / Q000378:metabolism; D001823:Body Composition; D001824:Body Constitution; D015992:Body Mass Index; D002319:Cardiovascular System / Q000503:physiopathology; D005260:Female; D015309:Glucose Clamp Technique; D005951:Glucose Tolerance Test; D006801:Humans; D007333:Insulin Resistance; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D018482:Muscle, Skeletal; D009765:Obesity / Q000150:complications / Q000503:physiopathology*; D010101:Oxygen Consumption; D010809:Physical Fitness; D017697:Premenopause; D012307:Risk Factors; D014057:Tomography, X-Ray Computed
chemical_list: D001786:Blood Glucose