The recent article from Church et al1 adds to their previous work2 examining the relationship between cardiorespiratory fitness and mortality among men with type 2 diabetes mellitus. The authors conclude that lower levels of fitness increase the risk for death due to cardiovascular disease (CVD), independent of body mass index (BMI) (calculated as weight in kilograms divided by the square of height in meters), with men considered class I obese (BMI, 30.0-34.9) or overweight (BMI, 25.0-29.9) and moderately fit having equal risk for CVD death as those categorized as having normal weight (BMI, 18.5-24.9) and a high fitness level. We question this conclusion, based on the analyses presented in Table 3 of their article.1
Johnson ST, Eurich DT, Johnson JA. Diabetes, Fitness, and Body Mass Index. Arch Intern Med. 2006;166(12):1326–1327. doi:10.1001/archinte.166.12.1326-b
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