Do timed up and go and five times sit to stand test outcomes correlate with trunk stability? A pilot-study

BACKGROUND: Five Times Sit to Stand (FTSS) and Timed Up and Go (TUG) are clinical tests in which performance is evaluated through completion time, which can be thought to reflect dynamic balance. Completion time in these tests, however, can be affected not only by balance stability but also by other important components, such as legs’ muscular strength and velocity. AIM: This investigation aimed to evaluate the correlation of completion times in these clinical tests and mediolateral (ML) balance stability measured through lower trunk accelerometry in older individuals. METHOD: Fifteen volunteers were evaluated, aged 60-86 years (M = 69.56±5.89 years). For TUG, we evaluated the conventional version of the test (TUGC), in addition to a dual task (TUGDT) and a new overline (TUGOL) version featured by increased balance demand. Balance stability during test performance was measured through ML accelerations of the lower trunk. RESULTS: The results indicated negative time-acceleration correlations for TUGC (rp = -.71, rp2 =.50, p <.01) and TUGDT (rp = -.77, rp2 =.59, p <.01) and a positive correlation for FTSS (rp =.73, rp2 =.53, p <.01). The TUGOL test failed to show significant time-acceleration correlations. CONCLUSION: Our results suggest that completion time in the FTSS test importantly reflects dynamic balance stability in older individuals. On the other hand, ML trunk acceleration when performing TUG seems to be more related to movement speed than body balance. Our results suggest that completion time can be considered a predictor of dynamic balance in the FTSS test.