Construct Validity and Responsiveness of the Rapid Assessment of Physical Activity in Adults Living With HIV.
Kenneth S Noguchi, Kelly K O'Brien, Rachel L Aubry and 7 others
PMID 34977546WHAT IT FOUND
The RAPA questionnaire accurately measures physical activity levels in adults with HIV at a single point in time.
However, it is not sensitive enough to reliably detect improvements in activity following an exercise intervention, so it should not be used alone to track progress.
Key findings
01All six hypotheses regarding the questionnaire's construct validity were confirmed, showing it correlates moderately with a reference physical activity measure and negligibly with unrelated health factors.
02Only two of five hypotheses regarding responsiveness were confirmed, indicating the tool failed to meet standards for detecting change over time.
03The study concludes that while the tool is valid for cross-sectional assessment, it must be combined with objective measures to assess change.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study relied exclusively on self-reported measures of physical activity without using a criterion standard like accelerometry, which may have affected the assessment of validity. Women were significantly underrepresented in the sample (only 5 out of 67 participants), so the findings may not generalize to women living with HIV. This was a secondary analysis of an existing intervention study, meaning the researchers could not control the study design or the timing of measurements. The analysis only assessed the aerobic component of the RAPA because the strength and flexibility component is scored on a nominal scale, which limits the applicability of the findings to the full questionnaire.
Declared interests
No specific funding sources or conflicts of interest were declared in the provided text.
The easy way to misread this
Do not assume that because the RAPA showed a statistically significant increase in scores after the intervention, it is a good tool for tracking patient progress. The study found that the tool failed most hypotheses for responsiveness, meaning it is not reliable for detecting change compared to other measures.