| Sumario: | The purpose of this study was to evaluate the association of pain-related anxiety on abdominal muscles thickness during standing postural tasks among individuals with chronic low back pain (CLBP). We obtained responses to a pain-related anxiety symptoms questionnaire from 50 participants with CLBP. We then separated participants into high (11 men, 14 women) and low pain-related anxiety (13 men, 12 women) groups and compared assessments of their lateral abdominal muscles thickness during standing tasks on a computerized balance assessment device, using one static level and 2 movable levels (levels 6 and 3 are represented easy and difficult tasks respectively). We found a significant interaction effect of standing difficulty (2 levels) and abdominal muscle thickness (transverse abdominis, oblique internal and oblique external muscles) (p <.001, effect size=.7). The high pain-related anxiety group exhibited greater abdominal muscle thickness during standing postural tasks compared with the low pain-related anxiety group (p <.05, mean difference=.04-.06) except for the internal oblique muscle during the difficult standing task (p =.2). We suggest that, among individuals with CLBP, pain-related anxiety and psychological pain-related anxiety may be possibly associated with abdominal muscles thickness during dynamic standing.
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