Clinimetric properties of the one‐leg sit‐to‐stand test in examining unilateral lower limb muscle strength among young adults

Background One‐leg sit‐to‐stand (one‐leg STS) test is a new clinical test developed to measure the unilateral lower limb (LE) muscle strength among young adults. This study examined the test‐retest reliability and the criterion‐concurrent validity of the one‐leg STS. Methods Forty young adults (mean age ± SD, 28.07 ± 5.39 years) participated in the study. The one‐leg STS test was administered in two separate assessment sessions to examine test‐retest reliability. Two‐leg STS test was administered and the performance time was measured. The concentric peak strength of hip flexors/extensors, knee flexors/extensors and ankle dorsi‐flexors/plantar‐flexors were determined using an isokinetic dynamometer. An intraclass correlation coefficient (ICC) was used to examine the test‐retest reliability of one‐leg STS test. The criterion validity of the one‐leg STS test was evaluated against the performance of the two‐leg STS test using an independent sample t test. The concurrent validity of the one‐leg STS test was evaluated by investigating the relationships between STS performance time and LE muscle strength using Pearson correlation coefficients. Results The reliability analysis showed that one‐leg STS performance time had excellent test‐retest reliability (ICC3,1 = 0.960, P