Abstract
The purpose of this study was to compare two lying and standing procedures for measuring orthostatic vital signs. Thirty-five normotensive participants (mean age 21.6 years)participated in a randomized crossover study. Measures of blood pressure (BP), heart rate, and dizziness were collected at different lying and standing times. AU subjects participated in a standardized walk paced at 4 miles per hour prior to lying. Using analysis of variance (ANOVA) with post hoc contrasts, the mean systolic BP differed between 5 and 10 minutes of lying (F = 21.33, p < .001) and the mean diastolic BP tended to differ between those time points (F = 5.23, p < .03). The mean standing systolic BP and dizziness rating were different between 0- and 2-minute intervals (F = 8.36, p < .01 and F = 7.15, p < .10). In normotensive participants following standardized exercise, orthostatic vital signs stabilized after lying 10 minutes.
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