Movement variability in adults with low back pain during sit-to-stand-to-sit

    loading  Checking for direct PDF access through Ovid

Abstract

Background:

Differences in movement variability may be related to a guarded response to pain or a less robust movement pattern, indicating a potential dysfunction in motor control. The study objective was to compare patterns of lumbo-pelvic coordinative variability, during repeated sit-to-stand-to-sit, in individuals with low back pain and healthy adults.

Methods:

Participants were adults with low back pain (n = 16) and healthy controls (n = 21). Kinematics for the T12-L3, L3-S1, and hip segments were measured using electromagnetic motion capture during 10 sit-to-stand-to-sit trials. Continuous relative phase analysis using the Hilbert transform method determined coordination and variability of the Hip-L3S1, and L3S1-T12L3 segments, deconstructed into 4 periods (start/up/down/end). T-tests compared coordination and variability of the full task between groups, and a mixed ANOVA compared the effects of group and period for the two segments.

Findings:

Across the full task, the low back pain group demonstrated more variable (mean difference = −6.95, 95% CI = −12.3 to −1.59) and greater out-of-phase behavior (mean difference = −22.6, 95% CI = −39.1 to −6.03) in the LHip-L3S1 segment. Group-period interaction effects revealed greater variability in the start period (mean difference = −0.325, 95% CI = −0.493 to −0.156) and more out-of-phase behavior in the start (mean difference = −0.350, 95% CI = −0.549 to −0.150) and end (mean difference = −0.354, 95% CI = −0.602 to −0.105) periods for the LHip-L3S1 segment.

Interpretation:

Excessive variability may relate to reports of poor spinal proprioception in low back pain; however, based on our sample characteristics (low pain and disability) and lack of symptoms during the task, classifying our findings as dysfunctional may not be fully warranted.

Related Topics

    loading  Loading Related Articles