Within-Session Test-Retest Reliability of Pressure Pain Threshold and Mechanical Temporal Summation in Chronic Low Back Pain

Oliveira, Fábio Carlos Lucas de; Cossette, Camille; Mailloux, Catherine; Wideman, Timothy H.; Beaulieu, Louis‐David; Massé‐Alarie, Hugo

doi:10.1097/ajp.0000000000001106

Cited by 1 publication

(1 citation statement)

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“…The mean value of the two PPT measures at each pressure point was calculated and used for further analysis. Previous studies have established excellent reliability of PPT testing for assessing the lumbar spine in both individuals with CLBP (22) and asymptomatic individuals (23), typically recommending two to three measurements at each site.…”

Section: Methodsmentioning

confidence: 99%

Low Back Pain–Induced Dynamic Trunk Muscle Control Impairments Are Associated with Altered Spatial EMG–Torque Relationships

ARVANITIDIS,

JIMÉNEZ-GRANDE,

HAOUIDJI-JAVAUX

et al. 2023

Medicine &Amp; Science in Sports &Amp; Exercise

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Purpose We quantified the relationship between high-density surface electromyographic (HDsEMG) oscillations (in both time and frequency domains) and torque steadiness during submaximal concentric/eccentric trunk extension/flexion contractions, in individuals with and without chronic low back pain (CLBP). Methods Comparisons were made between regional differences in HDsEMG amplitude and HDsEMG-torque cross-correlation and coherence of the thoracolumbar erector spinae (ES), rectus abdominis (RA) and external oblique (EO) muscles between the two groups. HDsEMG signals were recorded from the thoracolumbar ES with two 64-electrode grids and from the RA and EO muscles with a single 64-electrode grid placed over each muscle. Torque signals were recorded with an isokinetic dynamometer. Coherence (δ band (0-5 Hz)) and cross-correlation analyses were used to examine the relationship between HDsEMG and torque signals. For this purpose, we employed principal component analysis to reduce data dimensionality and improve HDsEMG-based torque estimation. Results We found that people with CLBP had poorer control during both concentric and eccentric trunk flexion and extension. Specifically, during trunk extension, they exhibited a higher HDsEMG-torque coherence in more cranial regions of the thoracolumbar ES and a higher HDsEMG-cross-correlation compared to asymptomatic controls. During trunk flexion movements, they demonstrated higher HDsEMG amplitude of the abdominal muscles, with the centre of activation being more cranial and a higher contribution of this musculature to the resultant torque (particularly the EO muscle). Conclusions Our findings underscore the importance of evaluating torque steadiness in individuals with CLBP. Future research should consider the value of torque steadiness training and HDsEMG-based biofeedback for modifying trunk muscle recruitment strategies and improving torque steadiness performance in individuals with CLBP.

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Section: Methodsmentioning

confidence: 99%