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Persuasive messages can motivate parent support for physical activity (PA). Many PA messages targeting parents are not necessarily inclusive of parents of children with disabilities (CWD). Guided by the theory of planned behavior and multi-process action control model, the relative effects of PA messages were examined among parents of CWD. Parents (N = 135) were randomized to view one of four PA messages. Parent support for PA and various psychosocial antecedents were assessed before and after message viewing, along with message preference. Baseline parent support for PA acted as a moderator on the effects of messages. Effects of messages did not differ between message conditions. Overall message effects were observed for attitudes, subjective norms and planning. Parent support for PA increased only among parents with low baseline parent support and the inclusive message was most preferred. This study can inform the development of PA messages targeting this population. [ABSTRACT FROM AUTHOR]

There is no known research examining the use of strategic messages to motivate youth with physical disabilities (YWPD), or how to create effective messages for them. Guided by the Social Issue Advertising Believability Model (SIABM), the study aimed to: (i) examine the effectiveness of physical activity (PA) messages on YWPD's attitudes and intentions to participate in PA, and (ii) consider factors related to message effectiveness. YWPD (N = 60) were randomized to view one of three PA messages: (a) no youth, (b) non-inclusive, and (c) targeted. Attitudes and intentions to participate in PA were assessed at baseline and immediately following viewing one of the three messages. Participants also evaluated the messages in terms of relevance, believability, attention, and attitudes. Repeated measures ANOVA and median split analyses indicated that attitudes toward PA increased after message viewing for participants with low baseline attitudes, but decreased for participants with high baseline attitudes. No significant changes in intentions emerged. The targeted message was most preferred and evaluated as most believable. Attention paid to the message was the only significant predictor of intention to participate in PA post-viewing (p =.001). PA campaigns should consider being inclusive of YWPD with low attitudes and intentions to engage in PA when developing messages. [ABSTRACT FROM AUTHOR]