Effect of aerobic exercise training on renal responses to sodium in hypertensives

Donald R. Dengel, Michael D. Brown, Thomas H. Reynolds IV, Mark A. Supiano

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Introduction: Aerobic exercise training has been shown to improve cardiovascular function and lower blood pressure (BP) in older adults. The exact mechanism(s) by which aerobic exercise training elicits these changes are unknown; however, it is possible that changes in renal hemodynamics may play a role. Purpose: The present study was undertaken to examine the effect of aerobic exercise training on renal hemodynamics in older hypertensive individuals. Methods: Renal plasma flow (RPF) and glomerular filtration rate (GFR) were determined by plasma and urinary clearances of 131I-hippuran and 99mTc-DTPA after 8 d of low (20 mEq) and high (200 mEq) Na + diets in 31 older (63 ± 1 yr), hypertensive (152 ± 2/88 ± 1 mm Hg) individuals at baseline and following 6 months of aerobic exercise training (at 75% V̇O2max, three times a week, 40 min per session). Results: Following 6 months of aerobic exercise training, a significant increase was seen in maximal aerobic capacity (V̇O 2max: 18.3 ± 0.7 vs 20.7 ± 0.7 mL·kg -1·min-1, P = 0.017) as well as a significant decrease in resting systolic (152 ± 2 vs 145 ± 2 mm Hg, P = 0.037) and mean arterial (109 ± 1 vs 105 ± 1 mm Hg, P = 0.021) BP. No significant (P < 0.05) effects were seen of aerobic exercise training on RPF (208.8 ± 12.2 vs 197.1 ± 13.1 mL·min-1·1. 73 m2), GFR (68.9 ± 3.6 vs 69.0 ± 3.9 mL·min-1·1.73 m-2), or filtration fraction (35.3 ± 2.3 vs 37.1 ± 2.4%) on the low Na+ diet or RPF (210.6 ± 12.8 vs 212.1 ± 11.7 mL·min-1·1. 73 m-2), GFR (72.9 ± 4.1 vs 77.3 ± 4.3 mL·min-1·1.73 m-2), or filtration fraction (37.1 ± 2.5 vs 37.7 ± 3.0%) on the high Na+ diet. Conclusions: Our results suggest that changes in renal hemodynamics do not contribute to the reduction in resting BP in older hypertensive persons.

Original languageEnglish (US)
Pages (from-to)217-222
Number of pages6
JournalMedicine and Science in Sports and Exercise
Volume38
Issue number2
DOIs
StatePublished - Feb 2006

Keywords

  • Aging
  • Blood pressure
  • Glomerular filtration rate
  • Renal plasma flow

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