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Using relative phase analyses and vector coding to quantify Pelvis-Thorax coordination during lifting-A

Jackie D Zehr1, Samuel J Howarth2, Tyson A C Beach3

  • 1Department of Kinesiology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|February 27, 2018
PubMed
Summary
This summary is machine-generated.

Continuous relative phase (CRP) and vector coding (VC) analyses effectively differentiate lifting techniques based on biomechanical risk. These methods work regardless of data normalization, aiding objective assessment of lifting coordination.

Keywords:
Dynamical systemsLow-back loadingManual handlingSpinal control

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Area of Science:

  • Biomechanics
  • Ergonomics
  • Kinesiology

Background:

  • Low-back disorder risk is influenced by pelvis-thorax coordination during lifting.
  • Objective methods are needed to evaluate different lifting techniques and their associated biomechanical risk.

Purpose of the Study:

  • To determine if continuous relative phase (CRP) and vector coding (VC) analyses can differentiate lifting techniques based on biomechanical risk criteria.
  • To assess the necessity of data normalization/transformation for discriminating between lifting techniques using CRP and VC analyses.

Main Methods:

  • Sixteen volunteers performed sagittal lifting tasks using freestyle (FRE), flexed spine (FLX), and neutral spine (NTL) techniques.
  • Continuous relative phase (CRP) and vector coding (VC) analyses quantified pelvis-thorax coordination using time-normalized, phase-normalized, and Hilbert-transformed kinematic data.
  • Statistical analysis compared coordination patterns between different lifting techniques.

Main Results:

  • Significant differences in mean relative phase angles and coupling patterns were found between FRE-NTL and FLX-NTL techniques (p < 0.01).
  • No significant differences were observed between FRE-FLX techniques (p > 0.44).
  • These discrimination results were consistent across all tested normalization and transformation methods for relative phase data.

Conclusions:

  • Continuous relative phase (CRP) and vector coding (VC) analyses are effective tools for objectively discriminating between lifting techniques with varying biomechanical risk.
  • The effectiveness of CRP and VC analyses in differentiating lifting techniques is independent of the specific normalization or transformation methods applied to the kinematic data.