Physical activity over the preceding 15 minutes significantly correlated with daytime systolic blood pressure (r=0.33), diastolic blood pressure (r=0.29), and heart rate (r=0.42) (P<0.001).
Observational (n=431)
Does physical activity level affect blood pressure variability in patients?
Physical activity is significantly associated with ambulatory blood pressure levels, with the strongest correlation seen with activity in the preceding 15 minutes.
Effect estimate: r = 0.33 (systolic BP), r = 0.29 (diastolic BP), r = 0.42 (heart rate)
p-value: p=< .001
The aim of this study was to assess the contribution of physical activity levels to blood pressure (BP) variability, and to assess the effect age, gender, body mass index, and use of antihypertensive medications on this relationship. We simultaneously monitored 24-h ambulatory BP by automated recorder and activity by actigraphy in 431 patients. Mean activity scores for the 5, 10, 15, and 20 min preceding each BP measurement were calculated, and BP and heart rate were related to these variables using linear mixed model regression. Various patient characteristics were added to the mixed model as covariates. Patients were heterogeneous in age (48 +/- 13 years), sex (49% men), and average 24-h BP (132/81 +/- 15/10 mm Hg). Mean daytime activity level was 44 +/- 15 U. During the daytime, systolic BP (r = 0.33), diastolic BP (r = 0.29), and heart rate (r = 0.42) correlated best with the average activity for the 15 min preceding each measurement (P < .001). Variance was very high, with activity explaining from 0% to 62% of BP variability for different individuals. Men and the obese had a greater reactivity of systolic BP to activity; older patients and those on antihypertensive therapy had a lower reactivity of heart rate. Blood pressure level is significantly associated with physical activity, but the percentage of variance of BP explained by physical activity varies greatly between individuals. Correlation is strongest between BP and average activity integrated over the previous 15 min. Much of the variance in blood pressure remains unexplained.
Leary et al. (2000) conducted an observational in Patients undergoing ambulatory blood pressure monitoring (n=431). Physical activity was evaluated on Correlation of daytime systolic BP, diastolic BP, and heart rate with average activity for the 15 min preceding measurement (r = 0.33 (systolic BP), r = 0.29 (diastolic BP), r = 0.42 (heart rate), p=< .001). Physical activity over the preceding 15 minutes significantly correlated with daytime systolic blood pressure (r=0.33), diastolic blood pressure (r=0.29), and heart rate (r=0.42) (P<0.001).