Test–Retest Reliability and Concurrent Validity of the 30 second Sit to Stand Test in Adolescents

Abstract

ABSTRACT The purpose of our study was to assess the test–retest reliability and concurrent validity of the 30 sec Sit to Stand test in a sample of adolescents. We recruited 30 male (58%) and 22 female (42%) participants (mean age = 15.77 years ± 0.46). Participants completed the 30-sec Sit to Stand and standing long jump tests on two occasions separated by 1 week. The rank order repeatability of the Sit to Stand test for the entire group was good (ICC = 0.84, 95% CI’s [0.71 to 0.91]), systematic error was low (1.7 repetitions ± 2.9), and the typical error between tests was 2.1 repetitions (95% CI’s 1.73 to 2.55). Sit to Stand results were significantly associated with lower body power (r = 0.55, p < .001). Our study demonstrated that the 30-sec Sit to Stand test has moderate-to-high test–retest reliability and acceptable concurrent validity in a population of adolescents.