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Related Concept Videos

Applications of Stress01:04

Applications of Stress

Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
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Stress: General Loading Conditions01:15

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Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication
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Relationships between subjective and objective measures in assessing postural stresses.

Dohyung Kee1, Inseok Lee

  • 1Department of Industrial and Management Engineering, Keimyung University, 1000 Shindang-Dong, Dalseo-Gu, Taegu 704-701, South Korea. dhkee@kmu.ac.kr

Applied Ergonomics
|July 5, 2011
PubMed
Summary

This study found that subjective discomfort ratings linearly correlate with objective measures of postural stress, including holding time, lifting index, and compressive force. These findings suggest discomfort can quantify workplace postural demands.

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08:12

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Published on: September 11, 2019

Area of Science:

  • Ergonomics and Occupational Health
  • Human Factors Engineering
  • Biomechanics

Background:

  • Postural stress is a significant factor in workplace injuries.
  • Quantifying postural stress objectively is crucial for effective ergonomic interventions.
  • Subjective discomfort is a common indicator of physical strain.

Purpose of the Study:

  • To investigate the relationships between subjective discomfort and objective measures of postural stress.
  • To determine if subjective discomfort can serve as a valid metric for quantifying postural demands.

Main Methods:

  • A comprehensive literature survey was conducted.
  • Objective measures analyzed included posture holding time, maximum holding time (MHT), joint torque, lifting index (LI), and compressive force (CF) at L5/S1.
  • Subjective discomfort was assessed using various scales, including magnitude estimation and Borg CR10.

Main Results:

  • Postural discomfort showed a linear increase with holding time and holding force.
  • Whole body discomfort was inversely proportional to maximum holding time (MHT).
  • Body-part discomfort correlated with joint torque, while overall discomfort strongly related to lifting index (LI) and compressive force (CF).
  • Discomfort measured by magnitude estimation linearly correlated with Borg CR10 ratings.

Conclusions:

  • Subjective discomfort is a reliable indicator that can be linearly related to objective measures of postural stress.
  • Discomfort assessment holds potential as a tool for quantifying postural demands in occupational settings.
  • These findings support the use of discomfort as a practical measure in ergonomic assessments to mitigate risks associated with postural stress.