Concordance Between Accelerometer-Measured and Self-Reported Physical Activity and Sedentary Time in Adults with Autism.

Lee et al. (2024) asked autistic adults to fill out a short survey about exercise and sitting time.

The team also clipped a small motion sensor, an accelerometer, to each person’s waist for seven days.

They then compared the survey answers to the exact movement data from the sensor.

People marked “moderate-to-vigorous activity” higher on the survey than the sensor recorded.

They also wrote down less sitting time than the device actually measured.

In short, the paper survey painted a rosier picture than real life.

Whitehouse et al. (2014) used the same waist-worn sensors on adults with cerebral palsy and saw the same pattern: people sit more than they think.

Cholemkery et al. (2016) paired motion sensors with a computer attention test in kids with ADHD. They found the sensors caught fidgeting the test missed, again showing surveys alone can mislead.

Healy et al. (2021) interviewed autistic adults who said weight control feels impossible. The new data explain part of the problem: we can’t help if we rely on faulty self-reports.

If you write exercise goals or health plans for autistic adults, skip the IPAQ survey. Strap on an accelerometer for one week instead. You will get true activity and sitting minutes, not wishful numbers. Better data mean better goals, better reinforcement, and real health gains.