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Does self-efficacy mediate functional change in older adults participating in an exercise program after hip fracture?
Feng-Hang Chang1, Nancy K Latham2, Pengsheng Ni2
1Graduate Institute of Injury Prevention and Control, Taipei Medical University, Taipei, Taiwan; Health and Disability Research Institute, Boston University School of Public Health, Boston, MA.
Objectives:
To examine whether self-efficacy mediated the effect of the Home-based Post-Hip Fracture Rehabilitation program on activity limitations in older adults after hip fracture and whether the mediating effect was different between sex and age groups.
Design:
Randomized controlled trial.
Setting:
Community.
Participants:
Participants with hip fracture (N=232; mean age ± SD, 79±9.4y) were randomly assigned to intervention (n=120, 51.7%) and attention control (n=112, 48.3%) groups.
Interventions:
The 6-month intervention, the Home-based Post-Hip Fracture Rehabilitation, is a functionally oriented, home-based exercise program. Data were collected at baseline, postintervention (6mo), and follow-up (9mo).
Main Outcome Measures:
Activity Measure for Post-Acute Care.
Results:
The mediating effect of the Home-based Post-Hip Fracture Rehabilitation program on Basic Mobility function through self-efficacy for exercise was significant at 9 months (βindirect=.21). Similarly, the mediating effect of the intervention on Daily Activity function through self-efficacy for exercise was significant at 9 months (βindirect=.49). In subgroup analyses, the mediating effect was significant at 9 months in the younger group (age, ≤79y) in comparison to the older group and was significant in women in comparison to men.
Conclusions:
Self-efficacy may play a partial mediating role in the effect on some longer-term functional outcomes in the Home-based Post-Hip Fracture Rehabilitation intervention. The results suggest that program components that target self-efficacy should be incorporated in future hip fracture rehabilitation interventions. Age and sex of the targeted participants may also need to be considered when developing interventions.
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