Chapter 11: Ergonomics, Health & Safety
Ergonomics Overview
Definition
- The study of human beings in relation to their working environment and the engineering of that environment for comfort, efficiency, and safety.
Causes
Goals / Objectives
- Make work more comfortable.
- Improve worker productivity.
- Enhance health and safety in the workplace.
Importance
- Directly affects employee well-being, performance, and retention.
- Poor ergonomic design can lead to long-term health issues and reduced output.
Benefits
- Happier and healthier employees.
- Higher quality work output.
- Lower employee turnover.
Procedures
- Not specified in notes as a step-by-step process; described as a design philosophy applied to workspaces.
Advantages & Disadvantages
- Not explicitly contrasted in notes.
Impact / Effect
- Well-designed environments lead to sustained productivity and fewer health complaints.
- Poorly designed environments increase risk of injury and dissatisfaction.
Examples
- Adjusting chair height and monitor position to reduce strain.
- Redesigning repetitive tasks to prevent injury.
Repetitive Strain Injury (RSI)
Definition
- A type of injury caused by repeated physical movements over a prolonged period.
Causes
- Performing the same tasks repeatedly without adequate rest.
- High typing speeds (e.g., >167 keystrokes per minute for keyboard operators).
Goals / Objectives
- Prevent RSI through workplace adjustments and behavioral changes.
Importance
- Common occupational hazard in computer-based work.
- Can lead to chronic pain and long-term disability if unaddressed.
Benefits
- Reduced risk of musculoskeletal disorders.
- Improved worker comfort and longevity in role.
Procedures
- Keep typing speed at a reasonable level.
- Take regular breaks from repetitive tasks to allow the body to rest.
- Consider job redesign to vary physical demands.
Advantages & Disadvantages
- Not explicitly contrasted in notes.
Impact / Effect
- Untreated RSI can result in persistent pain and lost work time.
- Prevention supports sustained productivity and employee health.
Examples
- Keyboard operators developing wrist or forearm pain from continuous typing.
- Office workers performing data entry for hours without breaks.
Eye Disorders
Definition
- Visual discomfort or impairment resulting from prolonged computer use or poor display conditions.
Causes
- Poor contrast on screen.
- Very small font size.
- Lighting that is too bright or too dull.
- Screen flicker.
- Sitting too close to the screen.
- Focusing at a fixed distance for extended periods.
Goals / Objectives
- Minimize visual strain through proper display and environmental setup.
Importance
- Eye strain reduces concentration and increases discomfort during computer tasks.
Benefits
- Improved visual comfort and focus.
- Reduced risk of long-term vision issues.
Procedures
- Adjust screen brightness and contrast.
- Use appropriate font sizes.
- Position screen at proper distance (18”–24” from face).
- Take visual breaks (e.g., 20-20-20 rule—though not named, implied by “focusing at fixed distance” issue).
- Use software like f.lux to reduce blue light (as referenced by https://justgetflux.com).
Advantages & Disadvantages
- Not explicitly contrasted in notes.
Impact / Effect
- Chronic eye strain can lead to headaches, blurred vision, and reduced work efficiency.
Examples
- Sore, red, or watering eyes after prolonged screen use.
- Blurred vision from small text or poor lighting.
Back and Shoulder Pain
Definition
- Musculoskeletal discomfort in the back and shoulders caused by poor posture or workstation setup during computer use.
Causes
- Improper desk or chair height.
- Monitor positioned too high, too low, or too close.
- Lack of lumbar support or poor seating posture.
- Extended static sitting without movement.
Goals / Objectives
- Promote neutral posture and reduce physical stress during computer work.
Importance
- Common complaint among office workers; affects long-term spinal health.
Benefits
- Reduced pain and fatigue.
- Better posture and sustained focus.
Procedures
- Position the top of the screen at eye level and 18”–24” from the face.
- Keep the keyboard at elbow height.
- Ensure the chair is padded but firm to support good posture.
- Allow enough legroom under the desk.
- Use smooth, rounded table edges to avoid pressure points.
Advantages & Disadvantages
- Not explicitly contrasted in notes.
Impact / Effect
- Poor ergonomics contribute to chronic pain and absenteeism.
- Proper setup enhances comfort and work endurance.
Examples
- Shoulder tension from reaching upward to type.
- Lower back pain from slouching in an unsupportive chair.
Office Environment Design
Definition
- The intentional arrangement of physical workspace elements (lighting, noise, temperature, furniture) to support health, comfort, and performance.
Causes
Goals / Objectives
- Create a comfortable, safe, and productive work environment.
Importance
- Environmental factors significantly influence cognitive performance and physical well-being.
Benefits
- Enhanced concentration and reduced stress.
- Lower risk of environmental strain (e.g., eye fatigue, hearing stress, thermal discomfort).
Procedures
- Lighting: Provide adequate lighting based on task detail; more detail requires better lighting.
- Noise: Maintain comfortable noise levels; avoid excessive noise that causes stress, high blood pressure, or poor concentration.
- Temperature: Keep office temperature in a comfortable range; extreme temperatures impair performance.
- Furniture: Use ergonomic chairs and desks with proper dimensions and adjustability.
Advantages & Disadvantages
- Not explicitly contrasted in notes.
Impact / Effect
- Poor environmental conditions lead to distraction, fatigue, and health issues.
- Optimized environments support sustained engagement and well-being.
Examples
- Glare on screen from overhead lighting causing eye strain.
- Open-plan office noise disrupting focus.
- Cold office reducing dexterity and morale.