Abstract:
Background:Stair climb power is an important clinical measure of lower-extremity power. The stair climb power test (SCPT) was validated by requiring individuals to climb a full flight of stairs. A 4-step SCPT (4SCPT) would be more clinically feasible and easier to perform, yet its reliability and validity are unknown. Objective:To evaluate reliability, validity, and minimal detectable change of 4SCPT among community-dwelling older adults. Design:This study is a cross-sectional analysis of baseline data from a clinical trial. Methods:Fifty older adults ≥65 years of age, at risk for mobility decline, consented to participate in this ancillary study. Test-retest reliability was derived from 2 measurements within each participant measured by a single assessor. Pearson correlation analyses among leg power measures (4SCPT, SCPT, single leg press power at 40% and 70% of the 1-repetition maximum [SLP40, SLP70]) were performed. Separate multivariate linear regressions were conducted evaluating the associations between each leg power measure and 2 mobility outcomes, the Short Physical Performance Battery (SPPB) and habitual gait speed (HGS). Minimal detectable change was based on a 90% confidence interval (MDC 90 ). Results:The 4SCPT had excellent test-retest reliability (ICC(2,1) = 0.951), and strong correlation with SCPT, SLP40, and SLP70 ( r = 0.85-0.96). The 4SCPT explained a greater amount of variance in the SPPB (R 2 = 0.31) than other leg power measurements (R 2 = 0.23-0.25). The 4SCPT (R 2 = 0.41) and SCPT (R 2 = 0.42) described equivalent amounts of variance in HGS, and greater than that with SLP40 (R 2 = 0.28) and SLP70 (R 2 = 0.30). The MDC 90 for 4SCPT was 44.0 watts. Limitations:This was a cross-sectional analysis within a small, nonrepresentative sample. Interrater reliability was not evaluated. Conclusions:The 4SCPT shows scientific promise as a valid and reliable leg power measurement among community-dwelling older adults.
journal_name
Phys Therjournal_title
Physical therapyauthors
Ni M,Brown LG,Lawler D,Bean JFdoi
10.1093/ptj/pzx039subject
Has Abstractpub_date
2017-07-01 00:00:00pages
767-773issue
7eissn
0031-9023issn
1538-6724pii
3746013journal_volume
97pub_type
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