Cardiorespiratory fitness, BMI, and risk of hypertension: The HYPGENE study

Tuomo Rankinen, Timothy S. Church, Treva Rice, Claude Bouchard, Steven N. Blair

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

INTRODUCTION: Cardiorespiratory fitness and regular physical activity are inversely associated with the risk of hypertension, and exercise training has been shown to lower elevated blood pressure (BP). Genetic factors contribute significantly to the interindividual differences in endurance training-induced changes in BP. However, similar data on the genotype-by-fitness interactions on the risk of hypertension are scarce. METHODS: In 2000, we started a systematic collection of blood samples from all consenting subjects of the Aerobics Center Longitudinal Study (ACLS) with a goal to generate a resource for studies addressing genotype-by-fitness interaction effects on various health-related end points. Here, we introduce the rationale and design of the first study based on the ACLS genetics resource focusing on hypertension as the health outcome (HYPGENE study), and we report the associations of cardiorespiratory fitness and body mass index (BMI) with the risk of hypertension. All HYPGENE subjects (N = 1234) were healthy and normotensive at their first clinic visit. Cases (N = 629) developed hypertension during the follow-up period (mean 8.7 yr), whereas controls (N = 605) remained normotensive (mean follow-up 10.1 yr). RESULTS: Cardiorespiratory fitness was the strongest predictor of the hypertension risk, with each maximal metabolic equivalent unit being associated with a 19% lower risk (95% confidence interval [95% CI], 12-24%). Each baseline BMI unit was associated with a 9% higher hypertension risk (95% CI, 4-13%). However, the association of BMI was greatly attenuated (odds ratio 1.04 [95% CI, 0.99-1.09]) when fitness also was included in the model. CONCLUSIONS: The HYPGENE study will provide an excellent resource to address hypotheses regarding the genetic basis of hypertension while taking cardiorespiratory fitness level into account.

Original languageEnglish
Pages (from-to)1687-1692
Number of pages6
JournalMedicine and Science in Sports and Exercise
Volume39
Issue number10
DOIs
StatePublished - Oct 2007

Keywords

  • Blood pressure
  • Case-control study
  • Genotype
  • Physical activity
  • Risk factor

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