Abstract
BackgroundUltrasound (US) imaging has been considered as a non-invasive technique to measure thickness and estimate relative abdominal muscle activity. Although some studies have assessed the reliability of US imaging, no study has assessed the reliability of US measurement of automatic activity of abdominal muscles in positions with different levels of stability in participants with chronic low back pain (cLBP). The purpose of this study was to investigate within-day and between-days reliability of US thickness measurements of automatic activity of the abdominal muscles in asymptomatic participants and within-day reliability in those with cLBP.MethodsA total of 20 participants (10 with cLBP, 10 healthy) participated in the study. The reliability of US thickness measurements at supine lying and sitting positions (sitting on a chair, sitting on a gym ball with both feet on the ground or lifting one foot off the floor) were assessed. We evaluated within-day reliability in all participants and between-days reliability in asymptomatic participants.ResultsWe found high ICC scores (0.85-0.95) and also small SEM and MDC scores in both groups. The reliability of the measurements was comparable between participants with and without LBP in each position but the SEMs and MDCs was slightly higher in patient group compared with healthy group. It indicates high intra-tester reliability for the US measurement of the thickness of abdominal muscles in all positions.ConclusionUS imaging can be used as a reliable method for assessment of automatic activity of abdominal muscles in positions with low levels of stability in participants with and without LBP.
Highlights
Ultrasound (US) imaging has been considered as a non-invasive technique to measure thickness and estimate relative abdominal muscle activity
The smallest absolute abdominal thicknesses were related to supine lying position and the highest values belonged to position 4 when participant sat on the gym ball and lifted his left foot off the floor in both healthy and chronic low back pain (cLBP) groups
The absolute thickness of transversus abdominis (TrA) ranged from 3.5 ± 0.5 mm to 6.6 ± 0.8 during four positions in healthy group and from 3.5 ± 0.8 to 4.9 ± 1 mm in Low back pain (LBP) group
Summary
Ultrasound (US) imaging has been considered as a non-invasive technique to measure thickness and estimate relative abdominal muscle activity. Some studies have assessed the reliability of US imaging, no study has assessed the reliability of US measurement of automatic activity of abdominal muscles in positions with different levels of stability in participants with chronic low back pain (cLBP). Real-time ultrasound (US) imaging has been recently used as a safe, costeffective and feasible method to evaluate muscle structure, function and activity [12,13,14]. Hodges et al [16] compared the thickness changes in the abdominal muscles in real time US and EMG activity. Using US imaging has been considered as a non-invasive technique to measure the thickness and estimate relative abdominal muscles activity
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