Influence of chronic low back pain and fear of movement on the activation of the transversely oriented abdominal muscles during forward bending

Publication date: Available online 23 February 2016
Source:Journal of Electromyography and Kinesiology
Author(s): Hugo Massé-Alarie, Louis-David Beaulieu, Richard Preuss, Cyril Schneider
IntroductionChronic low back pain (CLBP) and fear of movement (kinesiophobia) are associated with an overactivation of paravertebral muscles during forward bending. This impairs spine motor control and contributes to pain perpetuation. However, the abdominal muscles activation is engaged too in spine stabilization but its modulation with kinesiophobia remains unknown. Our study tested whether CLBP and kinesiophobia affected the activation pattern of abdominal muscles during trunk flexion/extension.MethodsSurface electromyographical recordings of the transversus abdominus/internal oblique (TrA/IO) and external oblique (EO) muscles were analyzed in 12 people with CLBP and 13 pain-free subjects during low-velocity forward bending back and forth from erected posture. Tampa scale of kinesiophobia was also administrated.ResultsTrA/IO activation, but not EO, was modulated across the phases of movement in both groups, i.e. maximal at onset of flexion and end of extension, and minimal at full flexion. In CLBP group only, TrA/IO activation was increased near to full trunk flexion and in correlation with kinesiophobia.ConclusionsThe phase-dependence of TrA/IO activation during trunk flexion/extension in standing may have a role in spine motor control. The influence of kinesiophobia in CLBP should be further investigated as an important target in CLBP management.



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