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Effect of posture on arterial baroreflex control of heart rate in humansThe effects of blood-volume redistribution induced by postural changes on baroreflex activity are investigated. The central blood volume and baroreceptor functions of ten males between 23-51 years old were examined while they were in the head-up tilt (HUT), head-down tilt (HDT), and supine positions. It is observed that during HDT at 15 deg the pulse interval over the first five cardiac cycles following neck suction onset is 51 + or - 18 ms longer, at 30 deg it is 61 + or - 20 ms longer, and at 45 deg it is 74 + or - 35 ms longer than at supine; during HUT at 15 deg the pulse interval is 25 + or - 9 ms shorter than when supine, but for the 30 and 45 deg there is no significant difference in pulse interval detected. The data reveal that posture does modify arterial baroreflex control of heart rate.
Document ID
19870027386
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Harrison, M. H. (NASA Ames Research Center Moffett Field, CA, United States)
Rittenhouse, D. (NASA Ames Research Center Moffett Field, CA, United States)
Greenleaf, J. E. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Publication Information
Publication: European Journal of Applied Physiology
Volume: 55
ISSN: 0301-5548
Subject Category
AEROSPACE MEDICINE
Distribution Limits
Public
Copyright
Other