Does the arterial baroreflex control the initial heart rate response to standing?
Following a 6 min period of squatting or sitting the early cardiovascular response to standing up was investigated on a beat to beat basis using noninvasive methods in healthy young subjects. After the active transition the arterial pressure fell immediately, the peak of heart rate response was markedly delayed with respect to the minimum in pulse and mean pressure. It is concluded that arterial barore-flexes can participate in the immediate heart rate increase to standing up from the squatting or sitting position whereas the subsequent phase of the initial heart rate response might be induced rather by other mechanisms.
D000328:Adult; D001158:Arteries / Q000502:physiology; D002320:Cardiovascular Physiological Phenomena; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D011187:Posture; D011311:Pressoreceptors / Q000502:physiology*