Validation of Objective Measures of Place-Based Physical Activity
The Personal Activity Location Measurement System (PALMS) researchers at UCSD have created a
web-based processing system for location (GPS) and physical activity (accelerometer) data.
We will collect data on a pilot sample of 40 Hispanic persons to a) test the validity of
PALMS assessments of transportation modes, and activity in different locations against an
objective record of activities derived from images collected by Vicon Revue; b) compare
PALMS assessments of transportation modes and activity locations to other self-report
measures and interview measures; c) assess the construct validity of PALMS-based activity
We will be assessing the usability of PALMS in a research staff with no previous experience
of using the PALMS system. We will be assessing the added value of using PALMS to examine a
place-based intervention in an existing cohort study.
Observational Model: Cohort, Time Perspective: Prospective
Construct validity assesses the theoretical relationship of a measure (and resulting variables) with other variables. The multitrait-multimethod matrix (MTMM) is a procedure first developed by Campbell and Fiske to asses construct validity by creating a fully crossed method-by-measure matrix of associations among multiple constructs and multiple measurement methods. The resulting matrix of correlation coefficients gives a pattern of associations that informs the validity evidence of the measure and construct. We will use the following measures in the multitrait multimethod matrix: Neighborhood Physical Activity Questionnaire, the American Timeuse Survey, and PALMS based physical activity in location estimates.
Kevin Patrick, MD, MS
United States: Institutional Review Board
|University of California, San Diego||La Jolla, California 92037-1709|