title: Bilateral effect of unilateral electroacupuncture on muscle strength.
abstract: OBJECTIVE
  This study aimed to examine the bilateral effect of 4 weeks of unilateral electroacupuncture on leg muscle strength.
  
  
  METHODS
  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.
  
  
  METHODS
  The trial was carried out in the exercise rehabilitation laboratory at Tianjin University of Sport.
  
  
  METHODS
  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.
  
  
  METHODS
  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.
  
  
  METHODS
  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.
authors.affiliation: Department of Health and Exercise Science, Tianjin University of Sport, Tianjin, China.
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Huang
authors.forename: Shi
authors.initials: S
authors.lastname: Zhou
authors.forename: Zhen
authors.initials: Z
authors.lastname: Lu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Tian
authors.forename: Xia
authors.initials: X
authors.lastname: Li
authors.forename: Long-Jun
authors.initials: LJ
authors.lastname: Cao
authors.forename: Jun-Hai
authors.initials: JH
authors.lastname: Yu
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
mesh_terms: D000328:Adult; D004311:Double-Blind Method; D015671:Electroacupuncture / Q000379:methods*; D006801:Humans; D007866:Leg / Q000294:innervation / Q000502:physiology*; D008297:Male; D009119:Muscle Contraction / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology*; D016059:Range of Motion, Articular; D012016:Reference Values; D011795:Surveys and Questionnaires; D016474:Weight-Bearing / Q000502:physiology