A simple acute problem, such as a muscle sprain, may require only one treatment, whereas more severe or chronic ailments may need a dozen treatments. When multiple treatments are necessary, they usually begin intensively. Patients often start with 1-3 treatments per week for 4-6 weeks. A positive response is usually seen after the first to third treatment. Once a maximum positive response is achieved treatments are usually tapered off. Animals undergoing athletic training can benefit from acupuncture treatments as often as twice a week. The frequency depends on the intensity of the training and the condition of the athlete.