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Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG.

Jennie A Jackson1, Svend Erik Mathiassen2, Jack P Callaghan3

  • 1Centre for Musculoskeletal Research, Department of Occupational and Public Health Sciences, University of Gävle, Gävle SE-80176, Sweden; Department of Medical Sciences, Uppsala University, Uppsala SE-75105, Sweden; Department of Kinesiology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|September 18, 2017
PubMed
Summary
This summary is machine-generated.

A specific prone task, similar to the Biering-Sørensen test, best minimizes measurement variance in erector spinae (ES) electromyography (EMG) studies. This improves the precision of ES EMG data for manual materials handling tasks.

Keywords:
Erector spinaeExposure variabilityLow backLumbarVariance components

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Occupational Health

Background:

  • Electromyography (EMG) is crucial for assessing erector spinae (ES) muscle activity during manual materials handling.
  • Sub-maximal normalization tasks are commonly used to standardize ES EMG measurements, but their impact on overall data variance is not fully understood.
  • Methodological variance in EMG can affect the reliability and interpretation of study findings.

Purpose of the Study:

  • To quantify the contribution of different sub-maximal normalization tasks to the total variance in erector spinae (ES) electromyography (EMG) exposure parameters.
  • To provide evidence-based guidelines for selecting normalization tasks that minimize methodological variance in ES EMG studies.
  • To enhance the precision and reliability of ES EMG measurements in occupational biomechanics research.

Main Methods:

  • ES EMG was recorded from 15 men at T9, L1, and L5 levels during a manual materials handling task over three separate days.
  • Eleven sub-maximal normalization tasks (eight static, three dynamic) were performed, with four repeats each.
  • Variance component analyses were used to determine the unique contribution of normalization to overall variance for each task and exposure parameter.

Main Results:

  • A prone task, mimicking the Biering-Sørensen test posture, demonstrated the highest repeatability across all electrode locations and exposure parameters.
  • Normalization tasks performed at the thoracic level (T9) generally exhibited lower repeatability compared to those at the lumbar level (L1, L5).
  • The chosen normalization task significantly influenced the overall variance of ES EMG exposure parameters.

Conclusions:

  • For optimal measurement precision in ES EMG studies using sub-maximal normalization, the recommended task is a prone posture similar to the Biering-Sørensen test.
  • Consideration should be given to developing specific normalization tasks for thoracic erector spinae muscles to improve repeatability.
  • Standardizing normalization procedures is essential for reducing methodological variance and increasing the reliability of ES EMG data in manual materials handling research.