The impact of fear of falling on health-related quality of life in community-dwelling older adults: mediating effects of depression and moderated mediation effects of physical activity

The fear of falling is a common issue among older adults that negatively affects physical and psychological aspects of health-related quality of life, regardless of actual fall events. Interventions aimed at reducing fear of falling, independent of falls, may improve older adults’ quality of life. This study examined the moderated mediation effect of physical activity in how fear of falling affects health-related quality of life through depression in community-dwelling older adults. This study used secondary data from the Korea Centers for Disease Control and Prevention’s 2019 Community Health Survey. The study included 73,738 adults aged 65 years or older. The researchers used the fear of falling scale, International Physical Activity Questionnaire, Patient Health Questionnaire-9, and EuroQol 5 Dimension as research tools, and performed descriptive statistics, Pearson’s correlation coefficient, and SPSS PROCESS macro analysis. The study used the bootstrapping method to assess the adjusted mediating effect by resampling 5,000 times, and determined statistical significance with a 95% confidence interval. In the model in which fear of falling affects health-related quality of life by mediating depression, the moderated mediation effect of physical activity was statistically significant, as the bootstrapping result did not include 0 in the 95% confidence interval (Index of moderated mediation [95% CI] = 0.006 [0.004–0.007], 0.008 [0.006–0.009]). Depression and health-related quality of life impairment decreased as the level of physical activity increased through inactivity, minimal activity, and health promotion activities, as the negative mediating effects decreased. Physical activity reduces depression and improves health-related quality of life by influencing older adults’ fear of falling. Community-based programs are needed to encourage and support older adults in maintaining moderate physical activity to manage the depression caused by fear of falling, which is common among older adults, and to improve their health-related quality of life.