In most cases, needles can be left in the ARPs from a few seconds to a few minutes. In cases of acute pain, a few seconds are sufficient for healing because the muscles may relax very quickly. In cases of chronic pain or internal disease, the needles should be retained longer to achieve more muscle relaxation, and this may cause the needle-induced lesions to stay longer and may reduce the swelling. In chronic cases, even 20-minute needling may not be sufficient to change the muscle physiology, and so a higher number of sessions is needed.
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