[Purpose] This study compared the coordination patterns of the trunk and pelvis in the
transverse plane between healthy subjects and patients with chronic low back pain during
an anterior load carriage task at various walking speeds. [Subjects] Ten healthy subjects
and 10 patients with chronic low back pain performed an anterior carriage task with a load
of 10% body weight at walking speeds of 3.5, 4.5, or 5.5 km/h. [Methods] The trunk and
pelvic kinematics were measured by using a motion analysis system. During the anterior
carriage task, the continuous relative phase differed significantly between groups with
respect to walking speed. [Results] The continuous relative phase was more anti-phase in
the chronic low back pain group than the control group. The inter-group continuous
relative phase pattern was affected by walking at 5.5 km/h. [Conclusion] Compared to
controls, subjects with chronic low back pain are unable to establish an in-phase between
the trunk and pelvis from walking at 3.5 to 5.5 km/h during an anterior carriage task.
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