The reliability, validity, and feasibility of physical activity measurement in adults with traumatic brain injury: an observational study.
OBJECTIVE
To determine the reliability and validity of the Physical Activity Scale for Individuals with a Physical Disability (PASIPD) in adults with severe traumatic brain injury (TBI) and estimate the proportion of the sample participants who fail to meet the World Health Organization guidelines for physical activity.


METHODS
A single-center observational study recruited a convenience sample of 30 community-based ambulant adults with severe TBI.


METHODS
Participants completed the PASIPD on 2 occasions, 1 week apart, and wore an accelerometer (ActiGraph GT3X; ActiGraph LLC, Pensacola, Florida) for the 7 days between these 2 assessments.


RESULTS
The PASIPD test-retest reliability was substantial (intraclass correlation coefficient = 0.85; 95% confidence interval, 0.70-0.92), and the correlation with the accelerometer ranged from too low to be meaningful (R = 0.09) to moderate (R = 0.57). From device-based measurement of physical activity, 56% of participants failed to meet the World Health Organization physical activity guidelines.


CONCLUSIONS
The PASIPD is a reliable measure of the type of physical activity people with severe TBI participate in, but it is not a valid measure of the amount of moderate to vigorous physical activity in which they engage. Accelerometers should be used to quantify moderate to vigorous physical activity in people with TBI.
Faculty of Health Sciences, Clinical and Rehabilitation Sciences Research Group (Drs Hassett and Harmer), The George Institute for Global Health, Sydney Medical School (Drs Hassett and Moseley), and Sydney School of Public Health (Dr van der Ploeg), The University of Sydney, Sydney, New South Wales, Australia; and Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU Medical Center, Amsterdam, the Netherlands (Dr van der Ploeg).
Leanne
L
Hassett
Anne
A
Moseley
Alison
A
Harmer
Hidde P
HP
van der Ploeg
D061725:Accelerometry; D000328:Adult; D001930:Brain Injuries / Q000503:physiopathology* / Q000523:psychology*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D015203:Reproducibility of Results; D057566:Self Report; D055815:Young Adult