Factors Associated with Ground Reaction Force/Weight During Standup Movements: A Cross-Sectional Study of Older Adults Using Daycare Rehabilitation

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Aim To examine the factors associated with ground reaction force (GRF) in the process of standing up among older adults certified as long-term care residents.Methods This cross-sectional study involved 68 participants (mean age 82 ± 7 years) in the analysis. Participants were instructed to perform a standup movement on a GRF meter, and the resulting GRF, divided by body weight, was used in the analysis. For statistical analysis, multiple regression analysis was conducted using GRF (F)/Weight (F/W) as the dependent variable.Results Multiple regression analysis with F/W as the dependent variable revealed a significant association with ankle joint plantar flexor strength (standard partial regression coefficient = 0.26, p = 0.044) and gait speed (standard partial regression coefficient = 0.33, p = 0.006).Conclusion These results emphasize the importance of assessing ankle joint plantar flexor strength and gait speed. Although further research is needed, suggest that physical therapy for ankle joint plantar flexor strength may enhance F/W during standup movements, thus improving standup movement.