Abstract: ObjectiveTo determine the test-retest reliability of isometric muscle strength measurement for the lower limb with functional squat system （FSS） in elderly people. Methods20 elderly participants were measured the isometric muscle strength in 5 s of each lower limb with FSS, and retested a week later. The maximal voluntary contraction and the average strength of each lower limb were recorded. ResultsThe intraclass correlation coefficient were 0.77～0.88 (P<0.01). ConclusionIsometric muscle strength measurement of the lower limb with FSS shows acceptable test-retest reliability in elderly.

Key words: isometric muscle strength, reliability, elderly, functional squat system