Abstract
Purpose
Decreases in brachial blood pressure (BP) may occur for several hours following a bout of exercise. Although aortic backward waves predict cardiovascular damage independent of brachial BP, whether decreases in aortic backward waves also occur post-exercise in young-to-middle-aged hypertensives, the extent to which these changes exceed brachial BP changes, and the best method of identifying these changes is uncertain.
Methods
We examined aortic function at baseline and 15-min post-exercise in 20 pre-hypertensive or hypertensive men and women (age 45 ± 7 years). Central aortic pressure, forward (Pf) and backward (Pb) wave pressures, the reflection index (RI) and augmentation pressure (AP) and index (AIx) were determined using applanation tonometry, and SphygmoCor software.
Results
Decreases in central aortic (p < 0.001) but not brachial systolic BP and pulse pressure (PP) occurred post-exercise. In addition, decreases in post-exercise (baseline versus post-exercise) Pb (19 ± 4 vs 13 ± 3 mm Hg p < 0.0001), RI (72.9 ± 22.1 vs 47.6 ± 12.8 %, p < 0.0001), AIx (26.3 ± 10.8 vs 7.8 ± 11.6 %, p < 0.0001) and AP (9.9 ± 3.9 vs 2.8 ± 3.9 mm Hg, p < 0.0001), but not Pf, were noted. However, decreases in AIx were not correlated with decreases in Pb, and whilst decreases in aortic PP correlated with decreases in Pb (p < 0.0001), no correlations were noted with decreases in AP or AIx.
Conclusion
In young-to-middle-aged pre-hypertensive and hypertensive individuals, aortic backward waves decrease post-exercise; this change is not reflected in brachial BP measurements and is poorly indexed by measures of pressure augmentation.
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Abbreviations
- Δ:
-
Change in
- AIx:
-
Aortic augmentation index
- AP:
-
Aortic augmentation pressure
- BMI:
-
Body mass index
- BP:
-
Blood pressure
- ECG:
-
Electrocardiograph
- Pb:
-
Aortic backward wave pressure
- Pf:
-
Aortic forward wave pressure
- PP:
-
Pulse pressure
- PPc:
-
Central aortic pulse pressure
- PWV:
-
Pulse wave velocity
- RI:
-
Aortic reflection index
- SBP:
-
Systolic blood pressure
- SBPc:
-
Central aortic systolic blood pressure
- VO2peak :
-
Peak oxygen consumption
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This study would not have been possible without the voluntary collaboration of the participants.
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This study was supported by the University Research Council of the University of the Witwatersrand, the South African National Research Foundation, the Carnegie Corporation and the Ernst and Ethel Eriksen Trust.
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Communicated by Massimo Pagani.
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Millen, A.M.E., Woodiwiss, A.J. & Norton, G.R. Post-exercise effects on aortic wave reflection derived from wave separation analysis in young- to middle-aged pre-hypertensives and hypertensives. Eur J Appl Physiol 116, 1321–1329 (2016). https://doi.org/10.1007/s00421-016-3391-1
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DOI: https://doi.org/10.1007/s00421-016-3391-1