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Related Experiment Videos

Lower working heights decrease contraction intensity of shoulder muscles in a herringbone 30° milking parlor.

Marianne Cockburn1, Matthias Schick1, Nicola A Maffiuletti2

  • 1Agroscope Tänikon Federal Research Station, Tänikon 1, 8356 Ettenhausen, Switzerland.

Journal of Dairy Science
|April 3, 2017
PubMed
Summary

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Lowering milking working heights reduces shoulder muscle strain for milkers. This study in herringbone 30° parlors found lower heights decrease muscular load, especially for shoulder muscles, benefiting milker health.

Area of Science:

  • Occupational Health and Safety
  • Ergonomics
  • Biomechanics

Background:

  • Musculoskeletal disorders are prevalent among dairy milkers.
  • Previous research developed a formula for optimal working heights in milking parlors.
  • Recommendations for herringbone 30° parlors were broad, necessitating further investigation.

Purpose of the Study:

  • To investigate the effect of working height on upper limb and shoulder muscle contraction intensities in milkers.
  • To refine ergonomic recommendations for milking parlor working heights.

Main Methods:

  • Evaluated 60 milking cluster attachment procedures in a herringbone 30° parlor.
  • Measured muscle contraction intensity of 4 bilateral arm/shoulder muscles using surface electromyography (EMG).
Keywords:
electromyographyergonomicsmilking health formulaphysical load

Related Experiment Videos

  • Analyzed data using linear mixed effects models, considering working height, sex, subject height, and repetition.

    • Main Results:

    • Decreased working heights reduced contraction intensity in the deltoideus anterior and upper trapezius muscles.
    • Women exhibited higher muscle contraction intensities than men.
    • Subject height did not significantly affect muscle contraction intensity.

    Conclusions:

    • Lower working heights decrease muscular load on shoulder muscles during milking.
    • Adjusting working heights based on individual body height is feasible and beneficial.
    • The milking health formula should be utilized to optimize and standardize working heights in herringbone 30° parlors.