Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33565
Title: Changes in heart rate and R-wave amplitude with posture
Authors: Jones, AYM
Kam, C
Lai, KW
Lee, HY
Chow, HT
Lau, SF
Wong, LM
He, J
Keywords: Cardiac axis
Heart rate
Posture
R-wave amplitude
Venous return
Issue Date: 2003
Publisher: Chinese Physiological Soc
Source: Chinese journal of physiology, 2003, v. 46, no. 2, p. 63-69 How to cite?
Journal: Chinese Journal of Physiology 
Abstract: Background: Effect of gravity on heart rate and blood pressure are well documented but the effect of posture R-wave amplitude has not been studied. Aim: To investigate the effect of posture on the heart rate (HR) and R-wave amplitude (RWA). Methods: The electrocardiograph (ECG) was recorded in 20 young subjects on two occasions. A 5 minute recording of resting ECG was taken with the subject adopting the following postural cycle: lying, sitting, standing, sitting and lying positions. Results: The standing HR was significantly higher than that in sitting and lying positions, but the RWA was significantly lower in standing compared to the sitting and lying postures. The HR significantly increased at the initial phase of postural changes, irrespective of the position. For example, the HR increased from lying to sitting (66.6±12.3 to 85.0±10.9 beat · min-1) but also increased when changed from sitting to lying (70.6±10.6 to 85.2±8.7 beat · min-1). Conclusion: Body posture has an effect on HR and RWA. The changes are probably related to orthostatic haemodynamic stress as well as changes in cardiac electrical axis. Whether the cause of the initial increase in the HR during postural change was attributed to skeletal muscle reflex or venous return requires further investigation.
URI: http://hdl.handle.net/10397/33565
ISSN: 0304-4920
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