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Ergonomics in the Workplace

Introduction to Ergonomics

  • Ergonomics is a science focused on designing environments, tools, and tasks to fit the worker.

  • While often limited to physical task aspects, ergonomics also addresses cognitive aspects aligning with worker capabilities.

  • Objectives of ergonomics include:

    • Reducing workplace injuries.

    • Increasing task efficiency.

    • Enhancing consistency in task performance.

  • Ergonomics is central to workplace wellness programming.

Key Concepts in Ergonomics

  • Ergonomic Products:

    • Commonly advertised ergonomic products include keyboards and chairs designed with good body mechanics in mind.

    • Manufacturers refer to anthropometric measurements (averages of body sizes) for design, usually from the 5th to the 95th percentile.

    • This can lead to issues as there’s significant size variation between individuals at these percentiles.

General Workplace Recommendations

  • Computer Usage Guidelines:

    • Maintain relaxed shoulders, elbows close to the body, and forearms near parallel to the ground with neutral wrists.

    • Seats should ensure hips, knees, and ankles are at 90 degrees with feet flat on the floor to improve comfort and circulation.

    • Keyboard height should align with elbows; monitors should be positioned at least 20 inches away, ideally at or near eye level to prevent neck strain.

    • Monitor alignment:

    • Align to the usage of primary monitor; adjust slightly if switching monitors.

    • If dual monitors are used equally, center alignment is optimal.

    • Laptop Usage:

    • Laptops are poor ergonomic options because they force compromises on head and hand positions. Using an external keyboard is recommended if feasible.

Sitting vs. Standing Workstations

  • Alternating Between Positions:

    • Both sitting and standing have health implications, making alternating beneficial.

    • Adjust workstation height based on task type:

    • Fine precision work: just above elbow height.

    • Lifting/light tasks: just below elbow height.

    • Heavy work: 4-6 inches below elbow height.

    • Consider individual differences: for example, a worker with cubital tunnel syndrome may need a lower workstation despite general recommendations for fine work.

Ergonomic Tools and Equipment

  • Tool Design Considerations:

    • Handles must be comfortable and large enough to distribute pressure across the hand, minimizing effort and awkward positions.

    • Use padded gloves with power tools to mitigate vibration-related injuries.

    • Correct tool handling is crucial - maintain elbow close to body and wrist in neutral position.

  • Body Mechanics for Lifting:

    • Store heavy items at hip height for easier lifting.

    • Use leg power for lifting rather than back, and avoid twisting.

    • Ensure even use of body sides and maintain a wide base of support when lifting.

Workplace Ergonomic Evaluations

  • Risk Factors:

    • Identify risk factors during evaluations, which include:

    • Repetitive movements (e.g., assembly line tasks).

    • Forceful movements (extensive lifting/gripping).

    • Awkward postures (e.g., prolonged twisted necks).

    • Excessive vibration (e.g., from power tools or driving).

    • Extreme temperatures (e.g., working in freezers).

    • Contact stress (e.g., resting arms on hard surfaces).

  • Prevention Strategies:

    • Primary Prevention:

    • Interventions to prevent workplace injuries before they occur.

    • Secondary Prevention:

    • Early detection of work-related injuries, such as educating workers on early back pain signs.

    • Tertiary Prevention:

    • Treatment of existing injuries while restoring function and minimizing complications.

Control Strategies for Ergonomics

  • OSHA outlines three categories of control strategies:

    • Engineering Controls: Focus on modifying the environment:

    • Ensure workstation setup reduces awkward postures.

    • Supply ergonomic tools and equipment.

    • Work Practice Controls: Ensure safe task performance through training:

    • Provide education on proper body mechanics for lifting.

    • Encourage use of personal protective equipment and stretches.

    • Administrative Controls: Implement management-led interventions:

    • Slow production lines to lessen stress on workers.

    • Rotate job assignments to reduce monotony and repetitive tasks.

    • Allow for scheduled breaks which require management approval.

Outcome Assessment after Ergonomic Assessments

  • Evaluating effectiveness post-implementation of ergonomic strategies:

    • Aim to reduce workplace losses instead of just counting injury numbers.

    • Effective programs should control the severity and frequency of injuries to minimize financial losses for the company.