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Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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Dynamic analysis of isoinertial lifting technique.

J M Stevenson1, J T Bryant1, S L French1

  • 1a School of Physical and Health Education, Queen's University , Kingston , K7L 3N6 , Canada.

Ergonomics
|January 13, 2017
PubMed
Summary

This study quantified dynamic measures of an isoinertial lift on an incremental lifting machine (ILM) and found significant gender differences in technique. These differences suggest ILM screening scores may underestimate female lifting capacity.

Keywords:
Dynamic analysisGender differencesLiftingLifting technique

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Sports Science

Background:

  • The incremental lifting machine (ILM) is used for assessing lifting capacity.
  • Understanding the dynamic measures of isoinertial lifts is crucial for accurate assessment.
  • Gender-specific differences in biomechanical techniques may influence performance metrics.

Purpose of the Study:

  • To quantify dynamic measures (displacement, velocity, force/acceleration, power) during a 1.83 m isoinertial lift on an ILM.
  • To identify gender-based differences in ILM lifting technique.
  • To evaluate the implications of these findings for using the ILM as a screening device.

Main Methods:

  • 132 military personnel (33 females, 99 males) performed a maximal isoinertial lift on the ILM.
  • A force transducer captured continuous data for displacement, velocity, acceleration/force, and power.
  • Data were analyzed into 37 lift parameters describing the dynamic components and overall lift averages.

Main Results:

  • The 1.83 m isoinertial lift was characterized by three phases: pulling, wrist changeover, and pushing.
  • Significant gender differences were observed in lifting technique parameters.
  • Females spent more time in the pushing phase and had less opportunity for power generation during the pulling phase.

Conclusions:

  • The ILM lifting protocol may impose different biomechanical demands on males and females.
  • Current ILM screening scores might underestimate the lifting capacity of females.
  • Independent consideration for male and female participants is recommended when designing ILM lifting protocols.