Accurate assessment of physical activity is important to studies interested in the relationship between physical activity and other variables. Questionnaires are the only feasible means for large-scale sampling but such self-report measures require validation due to their inherent subjectivity. The Adventist Health Study-2 (AHS-2) survey includes exercise items that were validated in the present investigation. A calibration study examined self-reports of exercise with two phone calls to 1,000 participants in which an interview-assisted 7-day physical activity recall was completed by a random sample of AHS-2 participants. Inter-index correlations both within the survey and between the survey and the 7-day physical activity recall were examined to offer convergent and discriminant validity. Finally, clinical data used to diagnose metabolic syndrome provided a third means of validation by demonstrating an inverse association with physical activity. Weak to strong correlations between the AHS-2 items and the 7-day recall, test-retest reliability, factor analysis, and metabolic syndrome data indicated that the questionnaire possessed an adequate level of validity.
","abstract_html":"<p>Accurate assessment of physical activity is important to studies interested in the relationship between physical activity and other variables. Questionnaires are the only feasible means for large-scale sampling but such self-report measures require validation due to their inherent subjectivity. The Adventist Health Study-2 (AHS-2) survey includes exercise items that were validated in the present investigation. A calibration study examined self-reports of exercise with two phone calls to 1,000 participants in which an interview-assisted 7-day physical activity recall was completed by a random sample of AHS-2 participants. Inter-index correlations both within the survey and between the survey and the 7-day physical activity recall were examined to offer convergent and discriminant validity. Finally, clinical data used to diagnose metabolic syndrome provided a third means of validation by demonstrating an inverse association with physical activity. Weak to strong correlations between the AHS-2 items and the 7-day recall, test-retest reliability, factor analysis, and metabolic syndrome data indicated that the questionnaire possessed an adequate level of validity.</p>","abstract_has_math":false,"creators":["Silber, Benjamin J."],"institution":null,"degree_name":"Master of Arts (MA)","degree_level":"Thesis","degree_discipline":"Psychology","degree_department":null,"school":null,"contributors":["Kelly R. Morton","Gary E. Fraser","Jason E. Owen"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2010,"date_issued":"2010-09-01T07:00:00Z","date_published":"2010-09-01T07:00:00Z","updated_at":"2026-07-24T02:53:20Z","subjects":["Exercise Science","Psychology","Physical Fitness; Exercise Therapy -- instrumentation; Directly Observed Therapy -- instrumentation; Metabolic Syndrome X -- physiology; Health Behavior -- psychology; Mental Recall; Patient Compliance; Task Performance and Analysis."],"languages":["English"],"rights":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarsrepository.llu.edu/etd/775","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Kelly R. Morton","Gary E. Fraser","Jason E. 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Inter-index correlations both within the survey and between the survey and the 7-day physical activity recall were examined to offer convergent and discriminant validity. Finally, clinical data used to diagnose metabolic syndrome provided a third means of validation by demonstrating an inverse association with physical activity. Weak to strong correlations between the AHS-2 items and the 7-day recall, test-retest reliability, factor analysis, and metabolic syndrome data indicated that the questionnaire possessed an adequate level of validity.
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