Article

This study investigated the effect of lumbar posture on function of transversus
abdominis (TrA) and obliquus internus (OI) in people with and without
non-specific low back pain (LBP) during a lower limb task. Rehabilitative
ultrasound was used to measure thickness change of TrA and OI during a lower limb
task that challenged the stability of the spine. Measures were taken in supine in
neutral and flexed lumbar postures in 30 patients and 30 healthy subjects. Data
were analysed using a two-way (groups, postures) ANOVA. Our results showed that
lumbar posture influenced percent thickness change of the TRA muscle but not for
OI. An interaction between group and posture was found for TrA thickness change
(F(1,56) = 6.818, p = 0.012). For this muscle, only healthy participants showed
greater thickness change with neutral posture compared to flexed (mean difference
= 6.2%; 95% CI: 3.1-9.3%; p < 0.001). Comparisons between groups for both muscles
were not significant. Neutral lumbar posture can facilitate an increase in
thickness of the TrA muscle while performing a leg task, however this effect was
not observed for this muscle in patients with LBP. No significant difference in
TrA and OI thickness change between people with and without non-specific LBP was
found.
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Langue : ANGLAIS