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[RC] Acupunture - Ridecamp Guest

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Authors ZY Li, CT Wang, AFT Mak, DHK Chow
Title   Effects of acupuncture on heart rate variability in normal subjects 
under fatigue and non-fatigue state
Full source     European Journal of Applied Physiology, 2005, Vol 94, Iss 5-6, 
pp 633-640

The objective of this study was to assess the effects of acupuncture applied at 
Hegu (LI 4) points and Neiguan (PC6) points on heart rate variability (HRV) in 
normal subjects under fatigue and non-fatigue states using power spectral 
analysis. Twenty-nine normal male subjects were randomly divided into three 
groups. Subjects in Group A and Group B performed a simulated driving task for 
3 h and acupuncture needles were then inserted perpendicularly into the LI 4 
points in the middle of the dorsal thenar muscle and PC 6 points situated 
between the tendons of the palmaris longus and carpi radialis muscles for 15 
min for Group A but inserted subcutaneously to the acupuncture points for Group 
B as a control. Acupuncture needles were directly inserted perpendicularly into 
the LI 4 points and PC 6 points for 15 min for Group C. Stimulations of the 
acupuncture points induced a significant decrease in heart rate (HR), HRV total 
power (TP), low frequency (LF) power and ratio of low frequency to high 
frequency (LF/HF), and a significant increase in the HF power in normalized 
units (NU) during the post stimulation period in fatigue state (P < 0.05). 
Stimulation of acupuncture points resulted in a significant increase both in 
the LF power and HF power in absolute units (AU) (P < 0.05) but no significant 
change in NU was found during the post stimulation period in non-fatigue state. 
It was concluded that the modulating effect of acupuncture on heart rate 
variability not only depended on the points of stimulation such as acupuncture 
or non-acupuncture points but also on the functional state of the subject, 
namely whether the subjects are in a state of fatigue or not.


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