Relationship between weight bearing ratio in sitting and physical function assessment in healthy adults

[Purpose] The weight-bearing ratio in sitting is a simple quantitative assessment using a body weight scale. Bilateral total weight bearing ratio in sitting is related to the ability to stand up, transfer, and walk; however, it has not been examined in the performance test on just one side. Therefore, this study aimed to investigate the relationship between weight bearing ratio in sitting and performance tests on one side. [Participants and Methods] Thirty-two healthy adults were recruited (27.47 ± 4.06 years). Weight-bearing ratio in sitting, knee extensor muscle strength, lateral reach test, and one-leg stand-up test were measured. Correlation analysis between the measurement results was performed on the pivot and non-pivot sides and the total. [Results] Correlation analysis of the weight-bearing ratio in sitting showed a significant positive correlation (pivot/non-pivot/total) with knee extensor muscle strength (r=0.54/0.44/0.50), lateral reach test (r=0.42/0.44/0.48), and one-leg stand up test (r=0.44/0.52/0.51). [Conclusion] Weight-bearing ratio in sitting, both pivot, non-pivot, and total, reflected results of the performance tests. Weight bearing ratio in sitting would be a highly useful quantitative assessment for a wide range of individuals, from those with unstable standing to those with relatively high function.