Document Detail


Using ecologic momentary assessment to measure physical activity during adolescence.
MedLine Citation:
PMID:  16242590     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: Examine the validity of using high-density electronic ecologic momentary assessment (EMA) to assess physical activity. EMA was further used to explore within- and between-subject variability in adolescent physical activity (PA) patterns. METHODS: Adolescents (n=526, 51% male) participated in EMA waves occurring approximately every 6 months between the 9th and 12th grade. Each wave extended over 4 consecutive days (Thursday to Sunday). Using a Palm III handheld computer, each participant reported his or her primary activity (e.g., exercise, walking, homework) every 30 (+/-10) minutes during waking hours. Heart rate (via Polar heart rate monitor) and activity counts (via wrist accelerometer) were simultaneously assessed during the EMA intervals. RESULTS: Overall, heart rates and accelerometer counts were greater for diary-reported exercise and walking than for nonphysical activities (p's<0.001). EMA revealed that the typical duration of exercise sessions was longer than walking sessions (p<0.05). Rates of walking and exercise were more consistent between waves (i.e., across high school) than within waves (i.e., across the 4 days of monitoring), most likely due to the significantly higher rates of walking and exercise occurring on weekdays as compared to weekend days (p's<0.001). Average rates of walking were greater for girls than boys, and the reverse was true for exercise. Rates of both walking and exercise declined steadily between 9th and 12th grade (p's<0.001). CONCLUSIONS: Physical activity reported via EMA corresponded to objective activity indicators. EMA yielded information about within-person variability in PA that cannot be obtained readily from traditional self-report instruments. Given its potential for simultaneously assessing important physiologic, psychological, and contextual factors, EMA presents a promising approach to studying adolescent physical activity.
Authors:
Genevieve F Dunton; Carol K Whalen; Larry D Jamner; Barbara Henker; Josh N Floro
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of preventive medicine     Volume:  29     ISSN:  0749-3797     ISO Abbreviation:  Am J Prev Med     Publication Date:  2005 Nov 
Date Detail:
Created Date:  2005-10-24     Completed Date:  2006-04-13     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8704773     Medline TA:  Am J Prev Med     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  281-7     Citation Subset:  IM    
Affiliation:
Department of Psychology and Social Behavior, University of California Irvine, CA 92697-7085, USA. gdunton@uci.edu
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adolescent Behavior / physiology*
Computers, Handheld
Exercise / physiology*
Female
Heart Rate
Humans
Longitudinal Studies
Male
Monitoring, Ambulatory / methods*
Sex Factors
Walking / physiology
Grant Support
ID/Acronym/Agency:
1P50 CA 84723/CA/NCI NIH HHS; 1R01 CA 84723/CA/NCI NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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