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Using threshold messages to promote physical activity

implications for public perceptions of health effects

Background: The promotion of physical activity (PA) guidelines to the general public is an important issue that lacks empirical investigation. PA campaigns often feature participation thresholds that cite PA guidelines verbatim [e.g. 150 min/week moderate-to-vigorous physical activity (MVPA)]. Some campaigns instead prefer to use generic PA messages (e.g. do as much MVPA as possible). 'Thresholds' may disrupt understanding of the health benefits of modest PA participation. This study examined the perception of health benefits of PA after exposure to PA messages that did and did not contain a duration threshold. Methods: Brief structured interviews were conducted with a convenience sample of adults (n= 1100). Participants received a threshold message (150 min/ week MVPA), a message that presented the threshold as a minimum; a generic message or no message. Participants rated perceived health effects of seven PA durations. One-way analyses of variance with post hoc tests for group differences were used to assess raw perception ratings for each duration of PA. Results: Recipients of all three messages held more positive perceptions of >150 min/week of MVPA relative to those not receiving any message. For MVPA durations

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Emily Knox
Oliver Webb
Dale Esliger
Stuart Biddle
Lauren Sherar

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Beweegrichtlijn
campagne
gedragsverandering
gezondheidseffecten
gezondheidsgedrag

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