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Related Concept Videos

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

842
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
842

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Biomechanical Changes Related to Low Back Pain: An Innovative Tool for Movement Pattern Assessment and Treatment Evaluation in Rehabilitation
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A Comprehensive Evaluation of Job Rotation: Biomechanical Risk, Body Discomfort, and Psychosocial Demands.

D J Rungere1, A C Dondi1, R Bellacov1

  • 1Department of Environmental and Public Health Sciences, College of Medicine, University of Cincinnati, Cincinnati, Ohio.

Human Factors
|April 1, 2026
PubMed
Summary

Job rotation schemes may not effectively reduce musculoskeletal disorder (MSD) risk. The overall risk in rotation schemes can exceed individual job risks, highlighting the need for careful ergonomic design.

Keywords:
ergonomicsmanufacturingmusculoskeletal systemphysical loadingrisk assessment

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Area of Science:

  • Occupational Health
  • Ergonomics
  • Industrial Hygiene

Background:

  • Job rotation is a proposed administrative control to mitigate musculoskeletal disorder (MSD) risks.
  • The actual effectiveness of job rotation in reducing MSD risk remains insufficiently understood.

Purpose of the Study:

  • To assess the efficacy of 82 distinct job rotation schemes in lowering MSD risk for workers.
  • To analyze the impact of job rotation on worker body discomfort and psychosocial demands.

Main Methods:

  • Utilized ergonomic assessment tools: Distal Upper Extremity Tool (DUET), Lifting Fatigue Failure Tool (LiFFT), and The Shoulder Tool (TST).
  • Conducted surveys to measure worker body discomfort and psychosocial demands.
  • Compared MSD risk across individual jobs and the entire rotation scheme.

Main Results:

  • MSD risk did not significantly vary across different rotation schemes or job positions within schemes.
  • The cumulative MSD risk of a job rotation scheme surpassed the sum of risks from individual jobs.
  • Correlations were identified between ergonomic risk outcomes and reported body discomfort (hands, elbows, hips, back, shoulders).
  • Increased psychosocial demands (effort, physical, mental workload) were linked to more complex rotation schemes and higher discomfort levels.

Conclusions:

  • Many implemented job rotation schemes lacked standardization and did not prioritize MSD risk reduction.
  • Job rotation effectiveness is contingent on balancing risks across body regions and minimizing high-risk jobs.
  • Expert ergonomic assessment is crucial for designing effective job rotation to ensure adequate muscle group rest, not just productivity.