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Serial measurements of low-frequency/high-frequency (LF/HF) ratio of heart rate variability, a marker of sympathetic nerve activity, in 16 healthy volunteers immediately before/after and 20/40 min following 15 min electroacupuncture (EA) at LI4+LI11 (EA group, red circles, n=8) or 15 min rest (control group, blue circles, n=8). Data are mean±SD. *p<0.05 comparing across time points (using repeated measures analysis of variance).
