A review of research on physical exercise with people with severe and profound developmental disabilities.

Gaily et al. (1998) read every paper they could find on exercise for people with severe or profound intellectual disability. They did not run new tests. They simply told the story of what earlier small studies had tried.

The team looked at work published up to the late nineties. Most studies had only a handful of participants.

The review found hopeful but thin evidence. Exercise sessions often boosted on-task behavior and fitness. A few studies saw less self-injury or tantrums after workouts.

No study gave clear rules on how often or how long to move. The authors said more work was needed before making firm plans.

In-Lee et al. (2012) later pooled fourteen of these small trials into one number. Their meta-analysis gave a medium effect size and a recipe: four sessions per week, thirty-one to sixty minutes each. This 2012 paper therefore supersedes the 1998 review by turning vague “some benefit” into a measurable 0.41 effect and a dosage guide.

Collins et al. (2017) extended the idea to children aged eight to twelve. Ten weeks of scheduled play improved aerobic scores and strength. That child-level detail was missing from the broader 1998 sweep.

Sarber et al. (1983) is actually inside the 1998 story. The old jogging study showed antecedent running cut classroom problem behavior for most students. The 1998 review simply summarized that trial along with others, so the two papers fit like Russian dolls rather than clash.

You no longer have to guess. Use the 2012 dose—four workouts a week, about forty-five minutes each—when you write plans for adults or teens with severe ID. Add the 2017 kid data and you can justify movement goals on IEPs for elementary clients. Start Monday by slotting a brisk walk or stationary bike before table work; both the 1983 trial and the later reviews say you will likely see smoother engagement right after.