Key result
Walking reduced aortic systolic blood pressure by 2.3 mmHg (P=0.03) and pulse pressure by 3.2 mmHg (P<0.001) after 60 minutes of recovery compared to baseline.
Why the study?
Central aortic blood pressure is reduced after exercise, but whether cardiorespiratory fitness relates to these postexercise reductions remained to be determined.
Does walking at different cadences reduce central aortic blood pressure in young adults, and does cardiorespiratory fitness relate to these changes?
Does walking at different cadences reduce central aortic blood pressure in young adults, and does cardiorespiratory fitness relate to these changes?
Cardiorespiratory fitness is associated with aortic pressure reductions after walking, dependent on exercise intensity.
Acute walking-associated aortic BP reductions merit controlled confirmation; leaves open fitness- and intensity-dependent effects in young adults.
BACKGROUND: Central aortic blood pressure (BP) is reduced after exercise. The aim of this study was to determine whether cardiorespiratory fitness relates to postexercise reductions in aortic BP. METHODS: Sixteen young adults completed maximal exercise testing for peak oxygen uptake (VO2). Participants walked at a slow (80 steps/min, ~47% maxHR) and fast (125 steps/min, ~65% maxHR) stepping cadence for 3000 steps on two nonconsecutive days. Before and after each walking condition, radial tonometry was used to derive aortic pressures. Measurements after walking were taken after 30 and 60 min of supine recovery. RESULTS: The change in aortic BP was similar between walking cadences. Aortic systolic BP (-2.3 mmHg, P=0.03) and pulse pressure (-3.2 mmHg, P<0.001) were significantly reduced after 60 min of recovery as compared to baseline. The reduction in aortic pulse pressure was associated with decreased forward (r=0.69, P<0.001) and backward wave pressure (r=0.70, P<0.001). Peak VO2 was not associated (P>0.05) with these changes, but was strongly associated with non-significant changes in aortic systolic BP (30min: r=-0.54, P=0.03) and diastolic BP (30 min: r=-0.64, 60 min: r=-0.77; both P<0.01) after slow walking only. CONCLUSIONS: These results indicate that cardiorespiratory fitness associates with aortic pressure reductions after walking dependent on exercise intensity.
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Compton et al. (2019) studied Healthy (n=16). Walking at slow and fast cadences vs. Baseline was evaluated on Change in aortic systolic blood pressure after 60 minutes of recovery (MD -2.3 mmHg, p=0.03). Walking reduced aortic systolic blood pressure by 2.3 mmHg (P=0.03) and pulse pressure by 3.2 mmHg (P<0.001) after 60 minutes of recovery compared to baseline.
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