Relationship between the single-leg up-down test and the weight bearing index

Abstract

[Purpose] The purpose of this study was to investigate the relationship between the single-leg up-down (SLUD) test and the weight bearing index (WBI). [Subjects and Methods] The subjects were 202 junior high school baseball players. They were divided into groups based on their scores in the SLUD test on the non-throwing side. Differences between the groups were investigated using one-way analysis of variance and multiple comparison analysis. [Results] The mean WBI of the SLUD test groups of 40, 30, 20, and 10 cm were 0.79 ± 0.18, 0.87 ± 0.20, 1.00 ± 0.19, and 1.04 ± 0.24, respectively. The 20- and 10-cm groups had higher WBI values than the 40- and 30-cm groups. [Conclusion] The results suggest that athletes need a WBI score of 1 or more, and that a SLUD test result of 20 cm may be a useful screening test for lower limb strength.