The bilateral ST36 acupoints, located on the posterolateral aspect of the knee approximately 2 mm below the fibular head, were selected for EA in our study. The mice were acupunctured by a pair of stainless needles in ST36 acupoints at a depth of 2–3 mm on bilateral hind limbs. An electrical stimulator (G6805-2A; Shanghai Huayi Medical Instrument Co., Ltd., Shanghai, China) was used in the experiment and stimulation was sustained for 30 min every day. For the SEA group, the mice underwent the same process without an electrical current. Mice were placed in a stimulus fixator for 30 min/day for 1 week before the experiment to eliminate constraint pressure.
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