American Journal of Epidemiology Vol. 152, No. 2 : 132-139
Copyright © 2000 by The Johns Hopkins University School of Hygiene and Public Health
ORIGINAL CONTRIBUTIONS |
Glucose Intolerance and Physical Inactivity: The Relative Importance of Low Habitual Energy Expenditure and Cardiorespiratory Fitness
1 Department of Community Medicine, Institute of Public Health, University of Cambridge, Cambridge CB2 2SR, United Kingdom.
2 Department of Mathematics, Hong Kong University of Science and Technology, Hong Kong, People's Republic of China.
3 Biostatistics Unit, Medical Research Council, Cambridge CB2 2SR, United Kingdom.
Glucose intolerance and diabetes mellitus are associated with physical inactivity, but it is unclear whether preventive interventions should aim at increasing overall energy expenditure or increasing participation in vigorous, fitness-enhancing activities. Studies aimed at separating and quantifying the effects of these two dimensions of physical activity should use well-validated measurement instruments and employ a study design in which the bivariate error structure of these instruments is determined. In the Isle of Ely Study (Cambridgeshire, United Kingdom), 775 individuals aged 45–70 years in 1994–1997 completed a glucose tolerance test and assessment of 4-day physical activity level (total energy expenditure/basal metabolic rate) by heart rate monitoring, a technique that has been validated against doubly labeled water and whole-body calorimetry. Cardiorespiratory fitness (maximum oxygen uptake (VO2max) per kg)) was measured in a submaximal test. To correct for measurement error, the authors had 190 individuals repeat both tests on three occasions at 4-month intervals. Two-hour glucose level was negatively correlated with physical activity level (men: r = -0.22, p < 0.001; women: r = -0.11, p < 0.05) and VO2max per kg (men: r = -0.18, p < 0.01; women: r = -0.19, p < 0.001) and was positively correlated with age and obesity. The model incorporating bivariate adjustment for measurement error showed that energy expenditure had a major effect on glucose tolerance, but there was less of an effect for cardiorespiratory fitness. These data provide support for public health strategies aimed at increasing overall energy expenditure.
energy metabolism; glucose intolerance; physical fitness
Abbreviations: MET(s), metabolic equivalent(s); VO2max, maximum oxygen uptake
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