Do smartphone applications and activity trackers increase physical activity in adults? Systematic review, meta-analysis and metaregression

Liliana Laranjo, Ding Ding, Bruno Heleno, Baki Kocaballi, Juan C. Quiroz, Huong Ly Tong, Bahia Chahwan, Ana Luisa Neves, Elia Gabarron, Kim Phuong Dao, David Rodrigues, Gisela Costa Neves, Maria L. Antunes, Enrico Coiera, David W. Bates

Research output: Contribution to journalReview articlepeer-review

142 Citations (Scopus)
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Objective: To determine the effectiveness of physical activity interventions involving mobile applications (apps) or trackers with automated and continuous self-monitoring and feedback. Design: Systematic review and meta-analysis. Data sources: PubMed and seven additional databases, from 2007 to 2020. Study selection: Randomised controlled trials in adults (18-65 years old) without chronic illness, testing a mobile app or an activity tracker, with any comparison, where the main outcome was a physical activity measure. Independent screening was conducted. Data extraction and synthesis: We conducted random effects meta-analysis and all effect sizes were transformed into standardised difference in means (SDM). We conducted exploratory metaregression with continuous and discrete moderators identified as statistically significant in subgroup analyses. Main outcome measures: Physical activity: daily step counts, min/week of moderate-to-vigorous physical activity, weekly days exercised, min/week of total physical activity, metabolic equivalents. Results: Thirty-five studies met inclusion criteria and 28 were included in the meta-analysis (n=7454 participants, 28% women). The meta-analysis showed a small-to-moderate positive effect on physical activity measures (SDM 0.350, 95% CI 0.236 to 0.465, I2=69%, T2=0.051) corresponding to 1850 steps per day (95% CI 1247 to 2457). Interventions including text-messaging and personalisation features were significantly more effective in subgroup analyses and metaregression. Conclusion: Interventions using apps or trackers seem to be effective in promoting physical activity. Longer studies are needed to assess the impact of different intervention components on long-term engagement and effectiveness.

Original languageEnglish
Pages (from-to)422-432
JournalBritish journal of sports medicine
Issue number8
Early online date21 Dec 2020
Publication statusPublished - Apr 2021


  • accelerometer
  • app
  • behaviour
  • effectiveness
  • physical activity


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