Key result
Acute hypotension induced by thigh cuff deflation revealed that the relationship between dynamic changes in arterial blood pressure and heart rate involves a pure time delay of 0.75 seconds.
Why the study?
How does acute hypotension induced by thigh cuff deflation affect beat-to-beat heart rate and arterial blood pressure in healthy subjects during progressive lower body negative pressure?
How does acute hypotension induced by thigh cuff deflation affect beat-to-beat heart rate and arterial blood pressure in healthy subjects during progressive lower body negative pressure?
Beat-to-beat heart rate responses to dynamic changes in arterial blood pressure may be controlled by an error signal rather than directional changes, suggesting a set point mechanism in short-term blood pressure control.
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May refine baroreflex timing models in acute hypotension; leaves open applicability to clinical populations.
Zhang et al. (2001) studied Healthy (n=10). Acute hypotension induced by thigh cuff deflation and lower body negative pressure vs. Supine resting conditions (baseline) was evaluated on Beat-to-beat changes in arterial blood pressure (ABP) and heart rate (HR). Acute hypotension induced by thigh cuff deflation revealed that the relationship between dynamic changes in arterial blood pressure and heart rate involves a pure time delay of 0.75 seconds.
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