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Most (55.0%, 61/111) were RCTs, and only 2 studies (1.8%) used rapid research designs: 1 single-case design and 1 multiphase optimization strategy. ... Objectives: This study aimed to (1) explore the extent to which evaluations of physical activity apps and wearables: employ rapid research designs; assess engagement, acceptability, as well as effectiveness ... 11-15; Temuco, Chile. ...doi:10.2196/mhealth.9054 pmid:29572200 pmcid:PMC5889496 fatcat:h2d2bqzpbrga7edw2iglumn7vi