Introduction High levels of anxiety in persons with intellectual disabilities (ID) have been consistently reported in literature (Emerson, 2003; Esbensen et al., 2003). Because of its relation with difficult behaviours (e.g., self-injury and irritability), anxiety can have detrimental effects on exposure of persons with ID to new learning and community integration (Masi et al., 2000). The purpose of this study was to investigate the effect of a program of adapted physical activity (APA) on anxiety in adult people with ID. Method A sample of 27 adults with a mild to moderate ID (mean age 40.1 years, SD ±6.2; men = 16 and women = 11) was randomly assigned to an experimental (n = 14) or a control group (n = 13). None of the participants ha...