PMID: 3758036Jan 1, 1986Paper

Effect of posture on arterial baroreflex control of heart rate in humans

European Journal of Applied Physiology and Occupational Physiology
M H HarrisonJ E Greenleaf

Abstract

Altered baroreflex function may contribute to the cardiovascular changes associated with weightlessness. Since central blood volume (CBV) increases during simulated weightlessness we have examined the possibility that acute changes in CBV may modify baroreceptor function. We used graded head-up tilt (HUT) and head-down tilt (HDT) to induce changes in CBV, and neck suction to stimulate carotid baroreceptors, in 6 subjects. The increase in pulse interval induced by a negative pressure of 8.2 kPa (62 mm Hg) imposed for 10 s while supine was compared with the increase while tilted for 8 min at +/- 15 degrees, +/- 30 degrees and +/- 45 degrees. During HDT at 15 degrees the pulse interval over the first 5 cardiac cycles following suction onset was 51 +/- (SEM) 18 ms longer (p less than 0.05), at 30 degrees it was 61 +/- 20 ms longer (p less than 0.05), and at 45 degrees it was 74 +/- 35 ms longer (p less than 0.01), compared with supine. During HUT at 15 degrees the pulse interval was 25 +/- 9 ms shorter (p less than 0.05) than when supine, but was not significantly different at 30 degrees and 45 degrees. These responses occurred independently of changes in brachial blood pressure. Attenuation was also observed after 5 min (56 +/- 17...Continue Reading

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References

Jan 1, 1976·Physiological Reviews·H R Kirchheim
Feb 1, 1979·Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology·Y A Mengesha, G H Bell
May 1, 1977·The Journal of Clinical Investigation·D L Eckberg, C R Orshan
Sep 1, 1976·Journal of Applied Physiology·D L EckbergA L Mark
Jan 1, 1986·European Journal of Applied Physiology and Occupational Physiology·M H HarrisonJ E Greenleaf
Oct 1, 1971·Cardiovascular Research·T G PickeringP Sleight
Sep 1, 1984·Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology·J E Greenleaf
Jan 1, 1983·Medicine and Science in Sports and Exercise·C G Blomqvist
Jun 1, 1982·Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology·G E BillmanH L Stone

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Citations

Dec 1, 1996·Clinical Autonomic Research : Official Journal of the Clinical Autonomic Research Society·A LindqvistC Strömberg
Nov 1, 1995·Clinical Physiology·J HartikainenE Länsimies
Apr 8, 2003·The Journal of Physiology·P O O JuluR Hainsworth
Sep 10, 2016·Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·Sten ÖstensonPyotr G Platonov
Feb 10, 2004·Journal of Applied Physiology·Tomi LaitinenJuha Hartikainen
Sep 19, 2007·The Journal of Physiological Sciences : JPS·Zhansheng ZhaoYasutaka Kurata
Aug 1, 1988·Acta Anaesthesiologica Scandinavica·L G EkmanB A Sjöqvist
Mar 14, 2019·Computational and Mathematical Methods in Medicine·Agnieszka KazimierskaMagdalena Kasprowicz
Nov 18, 2000·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·K I IwasakiB D Levine
Jan 20, 2018·American Journal of Physiology. Heart and Circulatory Physiology·André L TeixeiraLauro C Vianna

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