SMS reminders to increase accelerometer wear-time: a within-trial RCT comparing persuasive messages

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Background: Increasing accelerometer wear-time enhances the reliability of outcomes in physical activity research. Literature on persuasion suggests increased compliance with requests supplemented by a rationale. This study tested whether providing a rationale raises accelerometer wear-time. Methods: A within-trial RCT was conducted during baseline data collection in a school-based physical activity intervention trial. Of 186 total participants (mean age=18.6), 97 (52%) opted to receive daily SMS reminders to wear their accelerometers. These 97 participants were then randomised to receive either succinct reminders or reminders that additionally included a rationale. Findings: No significant difference in wear days was observed between those receiving SMS reminders (M=4.9, SD=2.2) and those not (M=4.4, SD=2.5) (p=0.67). Mean wear days did not significantly differ between the succinct reminder group (M=4.8, SD=2.3) and the rationale group (M=5.0, SD=2.0) (p=0.82). Discussion: Additional reasons may be unnecessary for participants already motivated to wear an accelerometer. Selection bias might explain why receiving reminders was not associated with increased wear time.
Originalspråkengelska
TidskriftThe European Health Psychologist
Volym17
NummerSupp.
ISSN2225-6962
StatusPublicerad - 2015
MoE-publikationstypB1 Artikel i en vetenskaplig tidskrift

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