Article

Cross-sectional study of lumbopelvic muscle activation during rapid
limb movements in chronic low back pain (CLBP) patients and healthy controls.
INTRODUCTION: Controversy exists over whether bilateral anticipatory activation
of the deep abdominal muscles represents a normal motor control strategy prior to
all rapid limb movements, or if this is simply a task-specific strategy
appropriate for only certain movement conditions. OBJECTIVE: To assess the onset
timing of the transversus abdominis/internal oblique muscles (TrA/IO) during two
rapid limb movement tasks with different postural demands - bilateral shoulder
flexion in standing, unilateral hip extension in prone lying - as well as
differences between CLBP and controls. METHODS: Twelve CLBP and 13 controls
performed the two tasks in response to an auditory cue. Surface EMG was acquired
bilaterally from five muscles, including TrA/IO. RESULTS:
In both groups, 50% of
bilateral shoulder flexion trials showed bilateral anticipatory TrA/IO
activation. This was rare, however, in unilateral hip extension for which only
the TrA/IO contralateral to the moving leg showed anticipatory activation. The
only significant difference in lumbo-pelvic muscle onset timing between CLBP and
controls was a delay in semitendinosus activation during bilateral shoulder
flexion in standing. CONCLUSION: Our data suggest that bilateral anticipatory
TrA/IO activation is a task-specific motor control strategy, appropriate for only
certain rapid limb movement conditions. Furthermore, the presence of altered
semitendinosus onset timing in the CLBP group during bilateral shoulder flexion
may be reflective of other possible lumbo-pelvic motor control alterations among
this population.
CI - Copyright (c) 2014 Elsevier B.V. All rights reserved.

Langue : ANGLAIS