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- W2018337228 abstract "Study Design Two-group, repeated-measures reliability study. Objectives To determine interrater and intrarater reliability of ultrasound measurements of transverse abdominal (TrA) and lumbar multifidus (LM) muscle thickness, during rest and contraction, in subjects with low back pain (LBP) and healthy subjects over 3 consecutive days, performed by an experienced and a novice rater. Background Previous reliability studies of TrA or LM thickness did not simultaneously account for muscle state, rater experience, and multiday assessment in large subject samples. Methods The 2 raters measured TrA and LM thickness on 3 consecutive days in 42 healthy subjects and 56 subjects with LBP, during rest and contraction, and calculated the percent thickness change from rest to contraction. Intraclass correlation coefficients (ICC2,k) and 95% minimal detectable change in thickness were derived for a single measure (day 1) and an average measure (days 1–3). Results The interrater ICC2,1 values for single-measure thickness (LBP group, 0.71–0.87; healthy group, 0.94–1.00) were similar to those for average-measure thickness (LBP group, 0.73–0.84; healthy group, 0.93–1.00). Both interrater ICC2,1 and ICC2,3 were lower for the relative thickness change (0.61–0.96). Intrarater ICC2,1 values across 3 consecutive days were high for both raters across the 2 groups (LBP group, 0.95–1.00; healthy group, 0.93–1.00), albeit lower for the relative thickness change (0.79–0.99). The 95% minimal detectable changes were less than 0.3 mm for the TrA and less than 2 mm for the LM (but, in most cases, less than 10% of average thickness). Conclusion Both experienced and trained novice raters provided reliable measurements of TrA and LM thickness in participants with LBP and healthy participants, during rest and contraction. One-time measurements were similar to averaged measurements. Small absolute errors were observed. Public trial registry: Australian New Zealand Clinical Trials Registry ACTRN12613001077752. J Orthop Sports Phys Ther 2014;44(12):979–988. Epub 3 November 2014. doi:10.2519/jospt.2014.5141" @default.
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- W2018337228 date "2014-12-01" @default.
- W2018337228 modified "2023-09-30" @default.
- W2018337228 title "Interrater and Intrarater Reliability of Transverse Abdominal and Lumbar Multifidus Muscle Thickness in Subjects With and Without Low Back Pain" @default.
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- W2018337228 doi "https://doi.org/10.2519/jospt.2014.5141" @default.
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