Construct validity of the Actiwatch-2 for assessing movement in people with profound intellectual and multiple disabilities

Helena J. M. van Alphen*, A. Waninge, Alexander E. M. G. Minnaert, Wendy J. Post, Annette A. J. van der Putten

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Background: Valid measures to assess either small or assisted performed movements of people with profound intellectual and multiple disabilities (PIMD) are required. We analysed the construct validity of the Actiwatch-2 to assess movement in people with PIMD.

Method: Twenty-two persons with PIMD were video recorded while wearing an Actiwatch-2. We used 15s-partial-interval recording to record upper body movement, body position and activity situation. Multilevel analyses were used to evaluate if the Actiwatch-2, based on produced counts, could detect changes in these factors.

Results: The presence versus absence of upper body movement and an activity situation in which participants were involved versus not involved resulted in significantly higher counts, with a large variety in predicted counts between participants. No relationship between body position and counts was found.

Conclusions: The Actiwatch-2 seems able to assess obvious upper body movement in people with PIMD, and whether there is involvement in an activity situation.
Original languageEnglish
Article number12787
Pages (from-to)99-110
Number of pages12
JournalJournal of Applied Research in Intellectual Disabilities
Issue number1
Early online date29-Jul-2020
Publication statusPublished - 17-Jan-2021


  • profound intellectual and multiple disabilities
  • physical activity
  • outcome assessment
  • Psychometric properties

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