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Physical activity self-monitoring and weight loss: 6-month results of the SMART trial

Conroy, MB and Yang, K and Elci, OU and Gabriel, KP and Styn, MA and Wang, J and Kriska, AM and Sereika, SM and Burke, LE (2011) Physical activity self-monitoring and weight loss: 6-month results of the SMART trial. Medicine and Science in Sports and Exercise, 43 (8). 1568 - 1574. ISSN 0195-9131

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Weight loss has been associated with higher physical activity (PA) levels and frequent dietary self-monitoring. Less is known about how PA self-monitoring affects adherence to PA goals, PA levels, and weight change. Methods: The SMART Trial is a clinical weight loss trial in which 210 overweight adults were randomized equally to one of three arms: 1) paper record (PR), 2) personal digital assistant with self-monitoring software (PDA), and 3) PDA with daily tailored feedback message (PDA + FB). PA self-monitoring and adherence to PA goals were based on entries in weekly submitted diaries. PA levels were measured via self-report by the past 6-month Modifiable Activity Questionnaire at baseline and 6 months. Results: Data are presented on 189 participants with complete 6-month PA data (84% female, 77% white, mean age = 47.3 ± 8.8 yr, mean body mass index = 34.1 ± 4.5 kg·m -2). Median PA level was 7.96 MET·h·wk -1 at baseline and 13.4 MET·h·wk -1 at 6 months, with significant PA increases in all three arms. PDA + FB arm had a higher mean number of weekly self-monitoring entries than the PR arm (3.4 vs 2.4, P = 0.003) and were more likely to maintain high (i.e., 100%) adherence to PA goals over time than the PDA (P = 0.02) or PR arms (P = 0.0003). Both PA self-monitoring and adherence to PA goals were related to higher PA levels at 6 months. A higher mean rate of PA self-monitoring was associated with a greater percentage of weight decrease (ρ = -0.49, P < 0.0001) at 6 months. Conclusions: PA self-monitoring and adherence to PA goals were more likely in participants in the PDA + FB arm and in turn predicted higher PA levels and weight loss. Copyright © 2011 by the American College of Sports Medicine.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Conroy, MB
Yang, K
Elci, OU
Gabriel, KP
Styn, MA
Wang, J
Kriska, AMKriskaA@edc.pitt.eduAKY
Sereika, SMssereika@pitt.eduSSEREIKA
Burke, LElbu100@pitt.eduLBU1000000-0003-2434-9867
Date: 1 August 2011
Date Type: Publication
Journal or Publication Title: Medicine and Science in Sports and Exercise
Volume: 43
Number: 8
Page Range: 1568 - 1574
DOI or Unique Handle: 10.1249/mss.0b013e31820b9395
Schools and Programs: School of Nursing > Nursing
Refereed: Yes
ISSN: 0195-9131
Article Type: Review
MeSH Headings: Adult; Body Mass Index; Diagnostic Self Evaluation; Feeding Behavior--physiology; Female; Humans; Male; Middle Aged; Monitoring, Physiologic--methods; Motor Activity--physiology; Overweight--therapy; Patient Compliance; Questionnaires; Weight Loss--physiology
PubMed ID: 21200337
Date Deposited: 20 Sep 2012 20:41
Last Modified: 26 Jan 2022 12:55


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