Abstract
Abstract Background The sit-to-stand test (STS) is a representative motor test. In most of STS, the time taken to complete the test was used as its score, and its quality of motion has not been focused. In the present study, we measured the lower trunk angular velocity using gyro sensor during STS and computed the angular velocity-based indices (AV-index). We investigated its test-retest reliability and concurrent validity. Method Seventy-eight older people in community-dwelling were participated. Basic-health-related-information and the previous one-year fall-history were obtained by a questionnaire. As motor-function tests, One Leg Standing test (OLS), 3 minutes walking test (3MWT), Timed Up and Go test (TUG) were performed. Additionally, Modify Five-Times-STS was performed twice, the lower trunk angular velocity during the tests were measured using gyro sensor. From the obtained-signal waveforms in the sagittal plane (SP), root mean square (RMS) and coefficient of auto correlation (AC), the mean impact at sitting timing (STS impact) in Modify Five-Times-STS were computed. The intra-class correlation coefficient (ICC) was calculated for the test-retest reliability of the AV-indices. The coefficients of Pearson’s correlation were computed between AV-indices and the Five-Times-STS score, and scores of motor-function tests. Result The ICC of STS impact and RMS in SP were 0.85. The ICC of the other AV-index were lower than 0.5. The RMS in SP was significantly associated with OLS (r = 0.24), and 3MWT (r = 0.36), TUG (r = −0.32). Additionally, the STS impact was significantly associated with 3MWT (r = 0.54). Conclusions The test-retest reliability of two AV-index (STS impact and RMS in SP) is good. The concurrent validity of AV-index is partly confirmed.
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