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(Circulation. 2005;112:505-512.)
© 2005 American Heart Association, Inc.

Epidemiology

Cardiorespiratory Fitness Is Inversely Associated With the Incidence of Metabolic Syndrome

A Prospective Study of Men and Women

Michael J. LaMonte, PhD, MPH; Carolyn E. Barlow, MS; Radim Jurca, PhD; James B. Kampert, PhD; Timothy S. Church, MD, MPH, PhD; Steven N. Blair, PED

From the Cooper Institute, Dallas, Tex.

Correspondence to Dr Michael J. LaMonte, Cooper Institute, 12330 Preston Rd, Dallas, TX 75230. E-mail mlamonte{at}cooperinst.org

Received August 31, 2004; revision received March 10, 2005; accepted March 30, 2005.

Background— Few studies have reported the relationship between cardiorespiratory fitness and metabolic syndrome incidence, particularly in women.

Methods and Results— We prospectively studied 9007 men (mean±SD age, 44±9 years; body mass index, 25±3 kg/m²) and 1491 women (age, 44±9 years; body mass index, 22±2 kg/m²) who were free of metabolic syndrome and for whom measures of waist girth, resting blood pressure, fasting lipids, and glucose were taken during baseline and follow-up examinations. Baseline cardiorespiratory fitness was quantified as duration of a maximal treadmill test. Metabolic syndrome was defined with NCEP ATP-III criteria. During a mean follow-up of 5.7 years, 1346 men and 56 women developed metabolic syndrome. Age-adjusted incidence rates were significantly lower (linear trend, P<0.001) across incremental thirds of fitness in men and women. After further adjustment for potential confounders, multivariable hazard ratios for incident metabolic syndrome among men in the low, middle, and upper thirds of fitness, were 1.0 (referent), 0.74 (95% CI, 0.65 to 0.84), and 0.47 (95% CI, 0.40 to 0.54) (linear trend P<0.001); in women, they were 1.0 (referent), 0.80 (95% CI, 0.44 to 1.46), and 0.37 (95% CI, 0.18 to 0.80) (linear trend P=0.01), respectively. Similar patterns of significant inverse associations between fitness and metabolic syndrome incidence were seen when men were stratified on categories of body mass index, age, and number of baseline metabolic risk factors, but patterns were variable in women.

Conclusions— Low cardiorespiratory fitness is a strong and independent predictor of incident metabolic syndrome in women and men. Clinicians should consider the potential benefits of greater cardiorespiratory fitness in the primary prevention of metabolic syndrome, particularly among patients who have already begun to cluster metabolic syndrome components.

Key Words: atherosclerosis • exercise • glucose • metabolic syndrome X • prevention

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