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Br J Sports Med 2009;43:52-56 doi:10.1136/bjsm.2008.050906
  • Original article

Decreased exercise blood pressure in older adults after exercise training: contributions of increased fitness and decreased fatness

  1. B B Barone1,
  2. N-Y Wang2,
  3. A C Bacher2,
  4. K J Stewart2
  1. 1
    Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
  2. 2
    Department of Cardiology, Johns Hopkins Medical Institute, Baltimore, Maryland, USA
  1. Dr B Barone, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA; bbbarone{at}jhsph.edu
  • Accepted 1 August 2008
  • Published Online First 26 August 2008

Abstract

Objective: To describe the contribution of changes in fitness and fatness resulting from exercise training on changes in submaximal exercise blood pressure (BP) during treadmill testing.

Design and setting: Prospective, randomised, controlled trial.

Participants: Sedentary older adults (n = 115) with untreated prehypertension or mild hypertension.

Intervention: Six-month supervised aerobic and strength training.

Main outcome measurement: Systolic BP (SBP) was assessed at rest and during each stage of a maximal graded exercise test (GXT) that determined Vo2peak. General and regional fatness was assessed by anthropometry, dual-energy x-ray absorptiometry and MRI. BP changes were calculated for each GXT stage, and multivariate regression models were used to describe the association of changes in exercise BP with changes in fitness and fatness.

Results: After training, exercisers versus controls had significantly increased Vo2peak and significantly lower measures of general and regional fatness. Also, stage-specific SBP was significantly lower at stage 3 (−9.4 vs −1.6 mm Hg, p = 0.03) and stage 4 (−7.9 vs −1.2 mm Hg, p = 0.03). Pooled regression analysis across all stages showed that exercisers had a 7.1 mm Hg reduction in SBP, but this reduction fell short of statistical significance (p = 0.12) compared with controls. A 1.0 ml/kg/min increase in Vo2peak and a 1.0 cm decrease in waist circumference independently predicted a 1.0 mm Hg decrease in exercise SBP (p = 0.04 and p = 0.001, respectively).

Conclusions: Decreased exercise SBP was independently associated with decreased waist circumference, a marker of abdominal obesity and increased fitness. These findings suggest that exercise training improves multiple factors that have an independent influence on SBP.

Footnotes

  • Competing interests: None.

Responses to this article

  • Re: Separating fatness from lack of fitness - authors reply
    • Bethany B. Barone,
    • Kerry J. Stewart
    Br J Sports Med published online April 14, 2009
  • Separating fatness from lack of fitness
    • Roy J. Shephard
    Br J Sports Med published online March 16, 2009

This Article

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