Measuring Methods for Functional Reach Test: Comparison of 1-Arm Reach and 2-Arm Reach

Abstract Kage H, Okuda M, Nakamura I, Kunitsugu I, Sugiyama S, Hobara T. Measuring methods for functional reach test: comparison of 1-arm reach and 2-arm reach. Objectives To investigate which functional reach test better reflects the center of pressure excursion, a 1-arm reach or a 2-arm reach, and to investigate the effect of trunk rotation on the reach distance in a 1-arm reach. In addition, we considered the influence of the individual variation at the starting position. Design Descriptive study using a force platform and a 3-dimensional (3D) motion capture system. Setting Motion analysis laboratory in a college setting. Participants Elderly volunteers (N=41; 15 men, 26 women; 71.8±5.2y). Interventions Not applicable. Main Outcome Measures 3D coordinate data and the movement of the center of pressure. Results The correlation between the reach distance and the center of pressure excursion was significantly higher ( P