Validation of Objective Measures of Place-Based Physical Activity

Study Overview
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Brief Summary
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Usability of the PALMS system, validity of the PALMS system and added value to an existing cohort study. Hypothesis: Addition of GPS device and use of PALMS system will allow researchers to better examine place-based interventions.

Detailed Description
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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 assessment. 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.

Official Title
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Validation of Objective Measures of Place-Based Physical Activity

Conditions
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Physical Activity

Participation Criteria
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Eligibility Criteria
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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 activity Latina woman

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Construct Validity | 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. | 7 days | 
| Usability | Direct observation of research staff with no experience using the PALMS system. | 1 day | 
| Added Value | We will be assessing GPS tracks in participants in the Fe en Accion cohort to determine the effectiveness of the place-based intervention. | baseline and 1 year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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construct validity, validation, physical activity, place-based interventions, divergent validity, usability, gps, PALMS