Reliability of the Trunk Lift in High School Boys and Girls |
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| Abstract: | The purpose of this study was to examine the reliability of the trunk lift test. Eighty eight high school boys and girls performed two trials of the trunk lift test as described in the FITNESSGRAM manual (Cooper Institute for Aerobics Research, 1992) on each of 2 days. Intraclass correlation coefficients were used to examine norm-referenced reliability, whereas P and modified kappa (κm) were used to examine criterion-referenced reliability. Additionally, a goniometer was used to examine the relationship between the trunk lift test and trunk range of motion. Reliability ranged from R = .93 to .98 with estimated reliability of R = .90 for boys and R = .85 for girls for a single trial test. Using 9 inches as the cutoff score, P was .93 with κm = .86 for boys, whereas for girls both P and κm were 1.0. Specifically, 93% of boys and 100% of girls passed the trunk lift test on both days. The correlation between trunk lift scores and goniometer scores was r = .70 for boys and r = .68 for girls. These results suggest that the trunk lift test is a simple and highly reliable test. However, the concurrent validity of the trunk lift test and the validity of the cutoff score used for this test need to be determined. Finally, the relationship between low back pain and trunk lift scores needs to be examined. |
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