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The moderated mediating effect of self-efficacy on exercise among older adults in an online bone health intervention study: a parallel process latent growth curve model
Zhu S, Nahm E-S, Resnick B, Friedmann E, Brown C, Park J, Cheon J, Park D
Journal of Aging and Physical Activity 2017 Jul;25(3):378-386
clinical trial
5/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: Yes; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

This secondary data analyses of a longitudinal study assessed whether self-efficacy for exercise (SEE) mediated online intervention effects on exercise among older adults and whether age (50 to 64 versus >= 65 years) moderated the mediation. Data were from an online bone health intervention study. Eight hundred sixty-six older adults (>= 50 years) were randomized to three arms: bone power (n = 301), bone power plus (n = 302), or control (n = 263). Parallel process latent growth curve modeling (LGCM) was used to jointly model growths in SEE and in exercise and to assess the mediating effect of SEE on the effect of intervention on exercise. SEE was a significant mediator in 50- to 64-year-old adults (0.061, 95 BCI 0.011 to 0.163) but not in the >= 65 age group (-0.004, 95% BCI -0.047 to 0.025). Promotion of SEE is critical to improve exercise among 50- to 64-year-olds.

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