Document Detail

Momentary assessment of adults' physical activity and sedentary behavior: feasibility and validity.
MedLine Citation:
PMID:  22866046     Owner:  NLM     Status:  PubMed-not-MEDLINE    
INTRODUCTION: Mobile phones are ubiquitous and easy to use, and thus have the capacity to collect real-time data from large numbers of people. Research tested the feasibility and validity of an Ecological Momentary Assessment (EMA) self-report protocol using electronic surveys on mobile phones to assess adults' physical activity and sedentary behaviors.
METHODS: Adults (N = 110; 73% female, 30% Hispanic, 62% overweight/obese) completed a 4-day signal-contingent EMA protocol (Saturday-Tuesday) with eight surveys randomly spaced throughout each day. EMA items assessed current activity (e.g., Watching TV/Movies, Reading/Computer, Physical Activity/Exercise). EMA responses were time-matched to minutes of moderate-to-vigorous physical activity (MVPA) and sedentary activity (SA) measured by accelerometer immediately before and after each EMA prompt.
RESULTS: Unanswered EMA prompts had greater MVPA (±15 min) than answered EMA prompts (p = 0.029) for under/normal weight participants, indicating that activity level might influence the likelihood of responding. The 15-min. intervals before versus after the EMA-reported physical activity (n = 296 occasions) did not differ in MVPA (p > 0.05), suggesting that prompting did not disrupt physical activity. SA decreased after EMA-reported sedentary behavior (n = 904 occasions; p < 0.05) for overweight and obese participants. As compared with other activities, EMA-reported physical activity and sedentary behavior had significantly greater MVPA and SA, respectively, in the ±15 min of the EMA prompt (ps < 0.001), providing evidence for criterion validity.
CONCLUSION: Findings generally support the acceptability and validity of a 4-day signal-contingent EMA protocol using mobile phones to measure physical activity and sedentary behavior in adults. However, some MVPA may be missed among underweight and normal weight individuals.
Genevieve Fridlund Dunton; Yue Liao; Keito Kawabata; Stephen Intille
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Publication Detail:
Type:  Journal Article     Date:  2012-07-30
Journal Detail:
Title:  Frontiers in psychology     Volume:  3     ISSN:  1664-1078     ISO Abbreviation:  Front Psychol     Publication Date:  2012  
Date Detail:
Created Date:  2012-08-06     Completed Date:  2012-10-02     Revised Date:  2014-07-31    
Medline Journal Info:
Nlm Unique ID:  101550902     Medline TA:  Front Psychol     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  260     Citation Subset:  -    
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