The prevalence of chronic insomnia in the general population is between 10 and 15%3 is common in adulthood, and predominantly affects women. Pharmacotherapy is the most often prescribed remedy for insomnia. However, non-pharmacologic therapy therapies have been suggested in the literature, between them the physical exercise. The aim of this study is to evaluate the chronic and acute effect of moderate-intensity physical exercise realized in two different times of day on sleep quality of patients with chronic primary insomnia. Will be selected 45 patients with primary chronic insomnia. They were randomly allocated to the groups MG - morning group(n= 15), AG - afternoon (n=15) and control group (CG). The experimental groups will carry out moderate-intensity aerobic exercise (intensity of ventilatory threshold one - VT-1) during six months. This study will be composed for 7 evaluations (baseline, acute, 2 months, 4 months, 6 months, 48 hours after 6 months and 1 month after the end). The approaches of sleep quality evaluation will be the polysomnografy and the sleep log. The questionnaires, the profile of mood states (POMS), the Anxiety trait and state (IDATE) and the quality of life (SF-36). The hypothesis of this study is that the aerobic exercise practice (moderate-intensity) in the two different times of day (morning and afternoon), during six months, can reduce anxiety, improve the profile of mood states, and increase the quality of life of the patients with primary chronic insomnia, and consequently result in an improvement in the quality of the sleep.
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