The effects of exercise on the health, intelligence, and adaptive behavior of institutionalized severely and profoundly mentally retarded adults: A systematic replication

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Abstract

Institutionalized severely and profoundly mentally retarded adults participated in a 7-month program of rigorous aerobic-type exercises. The effects of the treatment on the physical fitness, intelligence, and behavior of subjects were assessed. Fifty men and women were matched in pairs based on IQ, CA, and sex and assigned randomly to an experimental (E) or control (C) group. Those in the E group met 3 hours per day, 5 days per week and received a treatment that consisted of an exercise program that included jogging, running, dance-aerobics, and circuit training. The C group continued their normal institutional training programs. The treatment produced significant improvement in the cardiovascular efficiency of subjects; however, no changes in intelligence or adaptive behavior were obtained. Although standardized tests reflected little improvement in psychological or behavioral variables due to treatment, subjective reports suggest that exercise training may serve as a more practical habilitation program for severely and profoundly mentally retarded individuals than those typically employed in institutional settings.

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    In general, chronic exercise interventions do not lead to changes on general intelligence test scores. This conclusion has been supported by more recent in-depth reviews of the exercise literature (Tomporowski et al., 2010b; Keeley and Fox, 2009) that included additional studies conducted with children (Rarick et al., 1976) and adults (Tomporowski and Ellis, 1984, 1985) with developmental delays. Researchers who have selected tests that measure executive processing provide evidence for the selective effects of exercise interventions, particularly aerobic training, on children's mental function.

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