Author(s): MIYAMOTO, R., OSAWA, Y., MURANAGA, S., Institution: KAMEDA MEDICAL　CENTER, Country: JAPAN, Abstract-ID: 1359

INTRODUCTION:
It is known that evaluating the lower leg muscle strength is one of the key components since previous studies found a relationship between the deterioration of the muscle strength in lower leg and ease of falling and ADL level. As methods to evaluate lower leg muscle strength, the Stand-up test (ST) and the 5 times Sit to stand test (SS-5) are widely used. However, there are a few problem with each method, for example, some individuals have difficulty to sit on low seats in ST and there are ceiling effects in SS-5.
METHODS:
The purpose of this study is to investigate the relationship between ST and SS-5 among Japanese adults to select the suitable method dependent on their physical condition. This study was conducted for 703 Japanese adults (468 men and 235 women). All participants were measured height and weight and all completed ST and SS-5. ST is a test to assess lower leg muscle strength by having participants stand up on one or both legs once from four seats of different heights－40, 30,20, and 10cm. The result was evaluated by both leg standing (BLS) or single leg standing (SLS). SS-5 is also a test to assess lower leg strength by having them sit to stand from 40cm seat for five times as quickly as they can, and measures required time from the initial seated position to the final seated position. Spearman’s rank correlation coefficient was calculated for the correlation between ST and SS-5. Furthermore, one-way analysis of variance was performed with SS-5 as the dependent variable and ST as the independent variable. Multiple comparison analysis was performed using the Bonferroni test subsequently. All statistical analyses were performed using SPSS (SPSS for WindowsVer.25, IBM, Japan). P value lower than 5% was considered statistically significant.
RESULTS:
A weak correlation was observed between ST and SS-5 (r=0.33, p<0.01). In ST, there was statistical significance of average between BLS group and SLS group. However, no statistical significance was observed both among BLS group and among SLS group. The mean SS-5 in the ST groups of BLS20≦, BLS10, SLS40, SLS30, and SLS20≧ was 8.0±2.2 sec, 7.8±2.5sec, 7.0±1.6sec, 6.2±1,3sec, and 6.0±1.1sec respectively.
CONCLUSION:
This study showed the slight correlation between ST and SS-5, indicating the possibility that they could be mutually available. This suggests the possibility of using different measurement methods for dependent on the physical condition of the subject, for example, SS-5 would be selected in case when the subject has difficulty to sit on low seat in ST and ST would be substituted in case for frail elderly who can not perform required 5 times standing motions and for active healthy population who is unsuitable due to the ceiling effects in SS-5.