Meta-analysis of the effect of exercise programs for individuals with intellectual disabilities.
Four workouts a week, 31–60 minutes each, give medium-sized gains for people with ID—no pills required.
01Research in Context
What this study did
The team pooled 14 small studies on exercise for people with intellectual disability.
They looked at 67 effect sizes and asked: how much does exercise help, and what dose works best?
Kids and adults were mixed together, but most had mild or moderate ID.
What they found
Exercise gave a medium boost overall—about a 0.41 effect size.
Four sessions a week, each 31–60 minutes long, gave the biggest gains.
Older clients improved more than younger ones.
How this fits with other research
Willner (2015) shows pills barely touch aggression in ID—only risperidone helps a little.
In-Lee et al. (2012) now adds: skip the med cabinet and move the body instead.
Perez et al. (2015) found low interest predicts later self-injury; pairing their “track enjoyment” tip with regular workouts could cut both boredom and behavior spikes.
Modi et al. (2015) flags aggression and polypharmacy as reasons for costly inpatient admits; exercise offers a cheap, side-effect-free way to lower that risk.
Why it matters
You now have a clear script: schedule 4 movement sessions a week, keep each 31–60 minutes, and watch older clients shine.
Track interest levels before and after; if enjoyment drops, add variety or shorten drills.
This single switch can replace or reduce meds, cut referrals, and give clients a fun skill they own for life.
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02At a glance
03Original abstract
The purpose of this study was to examine the effects of physical exercise programs on individuals with intellectual disabilities (ID). This meta-analysis analyzed 67 effect sizes and 14 studies and calculated the standardized mean difference in effect size. The unit of analysis for overall effects was the study, and the sub-group analysis focused on effect size using a random effects model. The effect size of exercise programs was positive with a 0.41 standard deviation. The professional/scholastic measure was the most effective program, whereas the biometric and body composition effects were trivial. This study showed that short-duration exercise programs were more effective than those of longer duration, and an exercise program that runs 4 times per week had a better effect than one that runs 3 times per week. The most effective length of session for exercise was 31-60 min, and exercise was more effective for older people than for younger people. Amidst a growing variety of studies of physical exercise programs for individuals with ID, this meta-analysis indicated the present status and future direction of studies on physical exercise programs for individuals with ID. The limitations and implications for practice and theory were discussed.
Research in developmental disabilities, 2012 · doi:10.1016/j.ridd.2012.05.019