Participatory Intervention Among Construction Workers (IRMA11)


There is high prevalence of back pain and neck-shoulder pain among blue collar workers. Physical excessive exposures such as heavy lifting or working with a bended or twisted back are independent risk factors for back pain among workers in the construction industry. Participatory ergonomic initiatives increase the success of interventions aimed at reducing physical excessive exposures.

The objectives are in two phases to; 1) determine which work-tasks in selected job-groups involve the highest load of the back and shoulders during a normal working day (using EMG, Actigraphs, Video). 2) investigate whether a participatory intervention can reduce physical workloads, drawing on information from objective measurements from phase 1.

Full Title of Study: “Deltagerinvolverende Intervention Mod Fysiske Risikofaktorer for Muskel- og skeletbesv√¶r i Byggebranchen”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Randomized
    • Intervention Model: Parallel Assignment
    • Primary Purpose: Prevention
    • Masking: Single (Outcomes Assessor)
  • Study Primary Completion Date: June 2017


  • Behavioral: Participatory Intervention
  • Behavioral: Control

Arms, Groups and Cohorts

  • Experimental: Participatory Intervention
    • Participatory intervention with workers and their leaders. Workshops with presentation of work tasks with excessive physical load and subsequently plans to reduce these loads
  • Active Comparator: Control
    • Receive standard information about correct lifting technics, use of assistive technology, and ergonomics

Clinical Trial Outcome Measures

Primary Measures

  • Excessive physical load
    • Time Frame: change from baseline to 3 months follow-up
    • The primary outcome of the present study is the change from baseline to follow-up in frequency of events with excessive physical load

Secondary Measures

  • Pain intensity (0-10)
    • Time Frame: change from baseline to 3 months follow-up
    • Change in “low back pain intensity during the last week” from baseline to follow-up. A horizontally oriented modified VAS scale will be used with 11 points from 0 to 10.
  • WAI questionnaire
    • Time Frame: change from baseline to 3 months follow-up
    • Work Ability Index (Ilmarinen et al)
  • Self-efficacy Questionnaire
    • Time Frame: change from baseline to 3 months follow-up
    • Self-efficacy to improve the physical work environment

Participating in This Clinical Trial

Inclusion Criteria

  • Full time construction workers who are member of a labor union and can read and understand Danish.
  • The type of work must include manual work that involves lifting

Exclusion Criteria

  • life-threatening diseases
  • pregnancy
  • hypertension >160/100 mmHg
  • unable to participate in the measurements

Gender Eligibility: All

Minimum Age: 18 Years

Maximum Age: 67 Years

Are Healthy Volunteers Accepted: Accepts Healthy Volunteers

Investigator Details

  • Lead Sponsor
    • National Research Centre for the Working Environment, Denmark
  • Collaborator
    • Aalborg University
  • Provider of Information About this Clinical Study
    • Principal Investigator: Lars L. Andersen, Professor, PhD – National Research Centre for the Working Environment, Denmark
  • Overall Official(s)
    • Lars L Andersen, PhD, Study Director, National Research Centre for the Working Environment, Denmark

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