Bilateral effect of unilateral electroacupuncture on muscle strength

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Journal of Alternative & Complementary Medicine, Vol: 13, Issue: 5, Page: 539-546

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Huang, Liping; Zhou, Shi; Lu, Zhen; Tian, Qiang; Li, Xia; Cao, Longjun; Yu, Junhai; Wang, Hui
dorsiflexion; electoacupuncture; muscle strength
article description
Objectives: This study aimed to examine the bilateral effect of 4 weeks of unilateral electroacupuncture on leg muscle strength.Design: The effect of unilateral electroacupuncture at two selected acupoints, Zusanli (ST-36) and Xiajuxu (ST-39), which are located on the anterior tibialis muscle, on dorsiflexion strength was evaluated by statistical analyses of the interactions between the muscle strength pre and post 4 weeks of intervention, between the two legs, and between an experimental and a control group.Settings/location: The trial was carried out in the exercise rehabilitation laboratory at Tianjin University of Sport.Subjects: Thirty (30) healthy men with an average age of 20.9 +/- 2.98 (SD) years were randomly allocated into an electroacupuncture group (EG) and a control group (CG). They were physically active, but without specific strength training or previous experience of acupuncture.Interventions: Participants in the EG were given 3 sessions of electroacupuncture per week. In each session, the electroacupuncture was applied to the right leg at the acupoints with 8 duty cycles of 1 minute on and 1 minute off, pulse width of 1 millisecond, frequency of 40 Hz, and intensity of 30-40 V. Participants in the CG group kept their normal daily activities without additional intervention.Outcome measures: The maximum strength in dorsiflexion of each leg was examined by having participants lift weights in the range of motion of approximately 20 degrees at the ankle joint.Results: Repeated-measures analysis of variance with Bonferroni adjustment detected significant increase in strength of both legs (right 21.3%, left 15.2%) in the EG (p < 0.05) and the increase was significantly higher than that of the CG (p < 0.05). The CG showed no significant change (right 3.0%, left 4.8%), post-treatment.Conclusions: Unilateral electroacupuncture at the selected acupoints improved muscle strength of both limbs. These findings may have implications in physical therapy and rehabilitation settings.