Key result
Visual biofeedback during orthostatic stress produces greater tonic CV increases and earlier BP troughs than instructions.
Why the study?
Does visual biofeedback training improve voluntary control of diastolic blood pressure and heart rate during orthostatic stress in male college students?
RCT (n=40)
Does visual biofeedback training improve voluntary control of diastolic blood pressure and heart rate during orthostatic stress in male college students?
Visual biofeedback enhances voluntary control of blood pressure and heart rate during orthostatic stress, suggesting potential utility in managing orthostatic hypotension.
May support voluntary BP/HR control training in healthy young men; leaves open clinical utility in orthostatic hypotension.
Forty male college student volunteers were asked either to increase their diastolic pressure or their heart rate while sitting and during orthostatic stress (going from a sitting to a standing position), and half of them were also given second‐ to‐second visual feedback for the target variable. Systolic blood pressure was also continuously recorded. Comparisons were made between baseline and voluntary control conditions, and test trials were included to examine immediate carry‐over effects. With voluntary control instructions, substantial increases in tonic levels were obtained for the three cardiovascular variables in both sitting and postural change conditions. In general, the increases were significantly greater for feedback than for no‐feedback conditions. Phasic effects of feedback were also observed during postural change conditions: the blood pressure troughs and the heart rate peak occurred earlier with feedback than for instructions only. Immediate transfer effects were obtained in feedback conditions only. The results were discussed in terms of concomitant effects of somatic and cognitive activities. The distinctive feedback effects on the time course of the responses suggest that a precise analysis of response patterns is needed in selecting appropriate feedback methods in the management of orthostatic hypotension.
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Weipert et al. (1986) conducted an RCT in Orthostatic stress (n=40). Visual biofeedback vs. No-feedback (instructions only) was evaluated on Tonic levels of cardiovascular variables and phasic effects during postural change. Visual biofeedback during orthostatic stress produced significantly greater increases in tonic cardiovascular variables and earlier blood pressure troughs compared to instructions alone.
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