Validation of a 30-sec chair-stand test for evaluating lower extremity muscle strength in Japanese elderly adults

Abstract

The ability to rise from a chair is an important task of daily living． Many persons have increas− ing difficulty with this task as they proceed into the late decades of life． This study exa 皿 ined the va − lidity of a 30−s chair stand （CS −30）test for evaluating the lower extremity muscle strength of 486 Japallese elderly adults （209 皿 en and 277 women ， aged 60−87 years ）， To determine the test−retest reliability of ， CS −30 performances 44 elderly men and women underwent CS −30 testing on two occa − sions 4．10 days apart ． Intraclass correlation coeff コcient values were r ＝・84 fbr 皿 en and r ＝・88 fbr ， women ， indicating that the CS −30 test has good reproducible reliability ， The moderate correlation between CS −30 perforrnance and maximum voluntary isometric contraction force of knee extension was r ＝ ．44 fbr men and r ＝ ．52 forwomen ． Regression analysis revealed an age −associated decline in ＝ ， ， ， CS −30 perfbr皿 ance for men （r ．45 p く 0．001 ）and women （r ＝ ．44 p 〈0，001 ）but no differences were ob − ， served between the gender gro叩 s． In both men and women ， the CS −30 perfbrmance of the 70−74 75− 79 and 80＋ yr age groups was significantly lower（ρく 0．001）than that of the 60−64 yr group ． These ， results suggest that t｝1e CS −30 test has a high correlation of test−retest reliability and is a useful method for evaluating the lower extremity muscle strength ofJapanese elderly men and women in a 丘eld setting ．