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Body mass index versus dual energy x-ray absorptiometry-derived indexes: predictors of cardiovascular and diabetic disease risk factors.

Authors
Sharp-DS; Andrew-ME; Burchfiel-CM; Violanti-JM; Wactawski-Wende-J
Source
Am J Hum Biol 2012 Jul/Aug; 24(4):400-405
NIOSHTIC No.
20040304
Abstract
OBJECTIVES: The body mass index (BMI), a ratio of weight/height(2), dominates estimation of adiposity in population studies. BMI, however, does not distinguish among fat, muscle, or bone mass. Accordingly, its usage to assess and manage obesity in the population is limited. This study compares the use of BMI with direct measures of fat- and lean-mass to predict established cardiovascular and diabetes risk factors: blood pressure, lipids, and glucose. METHODS: The entire Buffalo Police Department was the object of recruitment to a baseline study of physiological and psychological stress. Four hundred nine officers constitute the sample for this analysis. Regression methods focusing on explained variance in blood pressure, high density lipoprotein (HDL) cholesterol, and blood glucose compare the use of BMI to that of fat- and lean-mass indexes derived from dual energy X-ray absorptiometry (DEXA). RESULTS: DEXA indexes explain 1.6%-3.3% (P < 0.05, all risk factors) more variance than BMI. Fat mass drives the association for blood pressure, trunk lean mass for HDL cholesterol, and both for blood glucose. High degrees of multicollinearity complicate interpretation of predictive models jointly containing BMI and DEXA indexes. CONCLUSIONS: In police officers, DEXA indexes are better predictors of cardiovascular disease and diabetes risk factors. However, populations with different distributions of fitness, diet, and health conditions may demonstrate different features. In contrast to BMI, DEXA-derived measurements suggest avenues to explore metabolic processes, which relate to an index's underlying association with risk and may suggest more effective intervention strategies.
Keywords
Anthropometry; Body-weight; Height-factors; Weight-factors; Cardiovascular-system; Cardiovascular-function; Absorptiometry; Sugars; Fats; Muscles; Risk-analysis; Risk-factors; Testing-equipment; Blood-pressure; Lipids; X-ray-absorption; Police-officers; Physical-fitness; Measurement-equipment; Employee-health; Diet; Metabolism; Cardiovascular-system-disease
Contact
Dan S. Sharp, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road, MS4020, Morgantown, WV 26505, USA
CODEN
AJHUES
Publication Date
20120701
Document Type
Journal Article
Email Address
DSharp@cdc.gov
Funding Type
Contract
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Contract-200-2003-01580; B02172012
Issue of Publication
4
ISSN
1042-0533
NIOSH Division
HELD
Priority Area
Services: Public Safety
Source Name
American Journal of Human Biology
State
WV; NY
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