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Validation of Objective Measures of Place-Based Physical Activity

18 Years
Open (Enrolling)
Physical Activity

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Trial Information

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.

Validation Study

Inclusion Criteria:

- Adults (18+ years old)

- Self-identify as Hispanic/Latino(a)

- Have a variety of primary transportation modes

- Have a variety of physical activity levels both occupational and leisure

- Commute different distances to the location

Exclusion Criteria:

- Illness that prevents normal activities

- Inability to ambulate

- Unable to wear the devices for up to 7 days

- Unable to complete two phone interviews in English or Spanish

- Unable to complete a written survey in English or Spanish

Usability Testing:

Research staff members of the SDSU Fe en Accion research study.

Added Value Cohort: Fe en Accion

Inclusion Criteria (Participants of the cohort):

- Attend church weekly

- Age: 18 - 65 years old

- Must live in San Diego County

- Live within 4 miles of their church

- engage in less than 150 minutes of leisure time moderate and vigorous physical

- Latina woman

Type of Study:


Study Design:

Observational Model: Cohort, Time Perspective: Prospective

Outcome Measure:

Construct Validity

Outcome Description:

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.

Outcome Time Frame:

7 days

Safety Issue:


Principal Investigator

Kevin Patrick, MD, MS

Investigator Role:

Principal Investigator

Investigator Affiliation:



United States: Institutional Review Board

Study ID:

111274/ 121378



Start Date:

September 2011

Completion Date:

April 2014

Related Keywords:

  • Physical Activity
  • validation
  • physical activity
  • place-based interventions
  • construct validity
  • divergent validity
  • usability
  • gps



University of California, San Diego La Jolla, California  92037-1709