Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30319
Title: Electrical stimulation of acupuncture points and blood pressure responses to postural changes : a pilot study
Authors: Jones, AYM
Kwan, YL
Leung, NTF
Yu, RPW
Wu, CMY
Warburton, DER
Issue Date: 2011
Publisher: Amer Assoc Critical Care Nurses
Source: American journal of critical care, 2011, v. 20, no. 3, p. e67-e74 How to cite?
Journal: American Journal of Critical Care 
Abstract: Background Application of transcutaneous electrical stimulation over acupuncture points (Acu-TENS) facilitates heart rate recovery after exercise and restores hemodynamic stability after open heart surgery. The role of Acu-TENS on cardiovascular parameters in response to postural changes has not been reported. Objective To investigate (1) the effect of Acu-TENS on blood pressure responses to -10° head-down postural change and (2) whether such effects were associated with modulation by the autonomic nervous system. Method Sixteen healthy volunteers, mean age 22.8 (SD, 3.1) years, were subjected to a -10° head-down tilt from the supine position on 3 separate occasions and received in random order the following 3 intervention protocols for 40 minutes before the postural change: Acu-TENS (over bilateral acupuncture points, PC6), sham-TENS (TENS applied to the skin over the patellae), and control (no electrical output from the TENS device applied at PC6). Mean arterial pressure, large artery elasticity index, cardiac output, and heart rate were recorded and compared at different stimulation protocols in the supine and -10° head-down tilt positions. Spectral analysis of heart rate variability was used to determine any modulation by the autonomic nervous system. Results Change in large artery elasticity index was observed only in the Acu-TENS group (P < .05) and mean arterial pressure appeared most stable during Acu-TENS. Autonomic nervous system modulation was not apparent with spectral analysis, irrespective of intervention. Sympathetic activity predominated in all positions. Conclusion Acu-TENS seems to reduce blood pressure changes with -10° head-down tilt with concomitant changes in arterial vessel tone.
URI: http://hdl.handle.net/10397/30319
DOI: 10.4037/ajcc2011142
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