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Shoulder moments and angles during single and combined manual material handling tasks.

Shoulder musculoskeletal disorders due to manual material handling tasks are common workplace injuries. Here we investigated the difference in shoulder biomechanics (moments and angles) between a single task of removing a box from a shelf (or depositing a box on a shelf) and the equivalent part of a...

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Published in:Ergonomics Vol. 64; no. 5; pp. 613 - 625
Main Authors: Harari, Yaar, Riemer, Raziel, Bechar, Avital
Format: pictorial research tables/charts Journal Article
Published: Taylor & Francis Ltd May2021
Online Access:View this record in EBSCOhost
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      dt: May2021
      vid: 64
      iid: 5
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      pub: Taylor & Francis Ltd
      place: Philadelphia, Pennsylvania
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        10.1080/00140139.2020.1858184
        150040169
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        atl: Shoulder moments and angles during single and combined manual material handling tasks.
      aug:
        au:
          Harari, Yaar
          Riemer, Raziel
          Bechar, Avital
        affil: Department of Industrial Engineering and Management, Ben-Gurion University of the Negev, Beer Sheva, Israel
      sug:
        subj:
          Shoulder Joint Physiology
          Biomechanics Evaluation
          Task Performance and Analysis
          Human
          Adult
          Female
          Male
          Shoulder Physiology
          Kinematics
          T-Tests
          Descriptive Statistics
          Shoulder Injuries Risk Factors
          Occupational-Related Injuries Risk Factors
          Adult: 19-44 years
          Female
          Male
      ab: Shoulder musculoskeletal disorders due to manual material handling tasks are common workplace injuries. Here we investigated the difference in shoulder biomechanics (moments and angles) between a single task of removing a box from a shelf (or depositing a box on a shelf) and the equivalent part of a combined task that consisted of removing, carrying and depositing boxes; that is, a single removing [depositing] task was compared with the removing [depositing] part of a combined task. We found that the peak and cumulative shoulder moments were larger during the single-task paradigm than during the equivalent part of the combined task by 26.3 and 25.5%, respectively. The two paradigms also differed in terms of shoulder angles. It is likely that the main contributors to this overestimation were differences between the single and combined tasks in terms of the lever arm (i.e. horizontal distance), the shoulder angle, and the task duration. Practitioners' Summary: We investigated shoulder moments during single and combined manual material handling tasks. Shoulder moments were found to be smaller during combined tasks. Practitioners should consider that analysing combined tasks using estimations based on single tasks could result in an overestimation of 26.3 and 25.5% in peak and cumulative shoulder moments, respectively. Abbrevaitions: MSDs: musculoskeletal disorders; MMH: manual material handling; LMM: linear mixed model
      pubtype: Academic Journal
      doctype:
        pictorial
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
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