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Ergonomics

Work Smarter, Not Harder

⏱️ 15 minutes
📚 Occupational Health Path
✓ OSHA Guidelines
Katie
Katie, Your Safety Guide
Welcome! Ergonomics is about fitting the job to the person, not forcing the person to fit the job. Poor ergonomics leads to musculoskeletal disorders (MSDs)—injuries to muscles, nerves, tendons, joints, and spinal discs. These injuries develop gradually from repetitive motions, awkward postures, and overexertion. Whether you work at a desk or lift boxes all day, proper ergonomics prevents pain and injury. Let's learn how to work comfortably and safely!
Slide 2 of 15

What is Ergonomics?

Ergonomics is the science of designing work tasks, equipment, and workspaces to fit the capabilities and limitations of workers. Good ergonomics reduces physical stress and prevents injuries.

🚨 Musculoskeletal Disorder (MSD) Statistics
According to OSHA and BLS:
  • 1.8 million workers suffer work-related MSDs annually
  • 33% of workplace injuries are MSDs
  • $15-20 billion in direct costs (workers' comp) annually
  • Average 12 days off work per MSD injury
  • Most common MSDs: Back injuries, carpal tunnel syndrome, tendonitis, rotator cuff injuries
  • Preventable: Proper ergonomics eliminates most MSDs
💡 Examples of Ergonomic Improvements
  • Office: Adjustable chair and monitor to support neutral postures
  • Warehouse: Lift assist devices to reduce manual lifting
  • Manufacturing: Rotate workers between tasks to vary muscle use
  • Retail: Anti-fatigue mats for standing workers
  • Healthcare: Patient lifts to prevent back injuries

Learning Objectives:

  • Understand ergonomic risk factors and MSDs
  • Set up an ergonomic office workstation
  • Practice safe lifting techniques and body mechanics
  • Recognize repetitive motion injuries and prevention
  • Incorporate stretches and micro-breaks into your day
  • Know when to report discomfort or pain
Slide 3 of 15

Ergonomic Risk Factors

What causes MSDs?

Musculoskeletal disorders develop when workers are exposed to ergonomic risk factors. Recognizing these risk factors helps you prevent injury.

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Repetitive Motion
Performing the same motion over and over. Examples: typing, assembly line work, scanning items, using power tools repeatedly. Causes: carpal tunnel, tendonitis, trigger finger.
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Forceful Exertion
Using excessive force with hands, arms, or body. Examples: heavy lifting, gripping tools tightly, pushing/pulling loads. Causes: muscle strains, joint damage, herniated discs.
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Awkward Postures
Working with body in unnatural positions. Examples: reaching overhead, twisting, bending, kneeling, working with bent wrists. Causes: back pain, shoulder injuries, neck strain.
⏱️
Static Postures
Holding the same position for long periods. Examples: standing in one place, sitting without movement, holding arms raised. Causes: muscle fatigue, reduced circulation, discomfort.
📞
Contact Stress
Body part pressing against hard or sharp surface. Examples: wrists resting on desk edge, hand gripping tool handle, leaning against workbench. Causes: nerve compression, reduced blood flow.
🥶
Vibration & Temperature
Hand-arm vibration from power tools or whole-body vibration from vehicles. Cold temperatures reduce dexterity. Causes: white finger syndrome, reduced grip strength.
⚠️ Risk Factors Combine
Multiple risk factors increase injury risk exponentially. For example, repetitive motion + forceful exertion + awkward posture is much more dangerous than any single factor alone. The more risk factors present, the higher your chance of developing an MSD.
🚨 Early Warning Signs of MSDs
Report these symptoms early—don't wait until pain is severe:
  • Pain, aching, or tenderness in joints or muscles
  • Stiffness or reduced range of motion
  • Tingling, numbness, or "pins and needles" sensation
  • Burning sensation in muscles or joints
  • Weakness or loss of grip strength
  • Swelling or inflammation
  • Symptoms that worsen during work and improve on days off
Early intervention prevents permanent damage. Don't "tough it out"—get help!
Slide 4 of 15

Office Ergonomics: Chair & Posture

Setting up your workspace

Proper workstation setup prevents back pain, neck strain, and repetitive stress injuries. Start with your chair—it's the foundation of good posture.

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Chair Height

Adjust so: Feet flat on floor (or footrest), thighs parallel to ground, knees at 90° angle, hips slightly higher than knees. Why: Reduces pressure on lower back and improves circulation.

↕️
Backrest

Adjust so: Lumbar support fills the curve of your lower back, backrest reclined 100-110° (slightly back from vertical). Sit back fully in chair—don't perch on edge. Why: Supports natural spine curve, reduces disc pressure.

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Armrests

Adjust so: Arms rest lightly, elbows at 90°, shoulders relaxed (not shrugged). Armrests should support forearms, not lift shoulders. If armrests cause shoulder shrugging, remove them. Why: Reduces shoulder and neck tension.

🧍
Neutral Posture

Maintain: Head balanced over shoulders (not jutting forward), shoulders back and down (not hunched), natural S-curve in spine, wrists straight (not bent up/down). Why: Minimizes muscle strain and joint stress.

❌ Poor Posture Habits to Avoid
  • Slouching or hunching: Increases back and neck strain by 300%
  • Perching on edge of chair: No back support, increases disc pressure
  • Crossing legs: Restricts circulation, causes hip/back misalignment
  • Tilting head forward: "Text neck"—adds 60 lbs of pressure on cervical spine
  • Twisting to view screen: Causes chronic neck and shoulder pain
  • Leaning on one armrest: Creates uneven pressure, spinal misalignment
✓ The "90-90-90 Rule"
Remember: 90° at ankles, 90° at knees, 90° at hips, 90° at elbows. This creates neutral body positioning that minimizes stress on joints and muscles.
Slide 5 of 15

Office Ergonomics: Monitor & Keyboard

Screen and input device positioning

Improper monitor and keyboard placement causes eye strain, neck pain, and wrist injuries.

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Monitor Height

Position: Top of screen at or slightly below eye level. Eyes should look down 10-20° to center of screen. Distance: 20-26 inches (arm's length) from eyes. Why: Prevents neck strain from looking up or down too much.

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Monitor Position

Placement: Directly in front of you (not to side). If using dual monitors, place primary monitor directly ahead and secondary at 30° angle. Tilt screen back 10-20° to reduce glare. Why: Eliminates twisting and neck rotation.

⌨️
Keyboard Position

Height: Elbows at 90°, wrists straight (not bent up or down). Keyboard at elbow height or slightly below. Distance: Close enough that shoulders stay relaxed, not reaching. Tilt: Flat or slight negative tilt (front higher than back). Why: Prevents carpal tunnel and wrist strain.

🖱️
Mouse Position

Placement: Same height as keyboard, close to body (don't reach). Keep wrist straight when using mouse—move from elbow, not wrist. Consider vertical mouse if wrist pain develops. Why: Reduces shoulder reach and wrist deviation.

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Document Holders

Use when: Frequently referencing paper documents while typing. Position: Between monitor and keyboard or beside monitor at same height/distance as screen. Why: Prevents constant neck bending to look down at desk.

⚠️ Laptop Ergonomics
Laptops are NOT ergonomic for extended use! Screen and keyboard are attached, forcing you to choose: proper screen height OR proper keyboard position—you can't have both.

Solution for full-time laptop use:
  • Use external keyboard and mouse
  • Raise laptop on stand to proper screen height
  • Or use external monitor and keep laptop closed
Never hunch over a low laptop screen for hours!
💡 The 20-20-20 Rule for Eye Strain
Every 20 minutes, look at something 20 feet away for 20 seconds. This relaxes eye muscles and reduces digital eye strain, headaches, and dry eyes.
Slide 6 of 15

Safe Lifting Techniques

Protecting your back

Back injuries are the most common workplace MSD. Proper lifting technique prevents herniated discs, muscle strains, and chronic back pain.

1
Plan the Lift

Check weight—if over 50 lbs, get help or use equipment. Clear path of obstacles. Know where you're going. Ensure stable footing. Wear proper footwear (no slip-on shoes).

2
Get Close to the Load

Stand as close as possible to the object. The farther the load from your body, the more stress on your back. Feet shoulder-width apart for stable base.

3
Squat Down - Don't Bend Over

CRITICAL: Bend knees and hips, NOT your back. Keep back straight (natural curve maintained). Squat down by pushing hips back. Get good grip on object before lifting.

4
Lift with Your Legs

Tighten core muscles. Keep load close to body. Push up with leg muscles (thighs, glutes)—NOT your back. Keep back straight as you stand. Look straight ahead, not down.

5
Don't Twist While Carrying

CRITICAL: Turn your whole body by moving your feet, don't twist your torso. Twisting while carrying is a leading cause of back injury. Point feet in direction you want to go.

6
Set Down Safely

Squat down using legs (don't bend back). Keep load close. Place object down gently—don't drop it. Remove hands only after object is stable.

❌ NEVER Do These Things When Lifting
  • Bend at waist with straight legs: Puts 1000+ lbs of pressure on lower back discs
  • Twist while lifting: Leading cause of herniated discs
  • Lift with jerky motions: Sudden movements cause muscle tears
  • Lift objects above shoulder height: Very unstable, high injury risk
  • Carry loads to one side of body: Creates uneven spine loading
  • Lift when fatigued: Muscle fatigue increases injury risk 300%
⚠️ When to Get Help or Use Equipment
Get assistance if:
  • Object weighs more than 50 lbs (or 25 lbs if lifting repeatedly)
  • Load is bulky, awkward, or oddly shaped
  • You can't get good grip on the object
  • You must lift above shoulders or below knees
  • You're fatigued or have back pain
Mechanical aids: Hand trucks, dollies, forklifts, pallet jacks, lift tables, hoists. Always use available equipment!
Slide 7 of 15

Repetitive Motion Injuries

Prevention and recognition

Repetitive strain injuries (RSIs) develop gradually from performing the same motion thousands of times. They're cumulative—damage builds up over weeks, months, or years.

🚨 Common Repetitive Motion Injuries
Carpal Tunnel Syndrome:
• Compression of median nerve in wrist
• Symptoms: Numbness/tingling in thumb and first 3 fingers, weakness in grip, pain that wakes you at night
• Causes: Typing, assembly work, tool use with bent wrists

Tendonitis:
• Inflammation of tendons (tissue connecting muscle to bone)
• Symptoms: Pain, tenderness, swelling, reduced range of motion
• Common locations: Shoulder (rotator cuff), elbow (tennis/golfer's elbow), wrist, Achilles
• Causes: Repetitive overhead reaching, forceful gripping

Trigger Finger:
• Tendon inflammation causing finger to lock in bent position
• Symptoms: Finger catches or locks, painful clicking, stiffness
• Causes: Repetitive gripping, forceful hand use

DeQuervain's Tenosynovitis:
• Inflammation of tendons at base of thumb
• Symptoms: Pain near thumb, difficulty gripping, swelling
• Causes: Repetitive thumb movements, awkward wrist positions
✓ Prevention Strategies
Vary Your Tasks (Job Rotation):
Switch between different tasks throughout the day. This gives overused muscles time to recover while using different muscle groups. Example: Alternate between computer work, filing, and phone calls.

Take Micro-Breaks:
Every 30 minutes, take 30 seconds to stretch and rest overused muscles. Even brief breaks significantly reduce injury risk.

Maintain Neutral Positions:
Keep wrists straight when typing/using tools. Avoid extreme bending, twisting, or reaching.

Reduce Force:
Use lightest grip necessary. Don't grip tools/pens tighter than needed. Use ergonomic tools that require less force.

Pace Yourself:
Avoid "marathons" of the same activity. Spread repetitive tasks throughout week rather than doing them all at once.
⚠️ Don't Ignore Early Symptoms
RSIs are progressive—they get worse over time if not addressed.

Stage 1: Mild discomfort during work, improves with rest
Stage 2: Pain persists after work, reduced performance
Stage 3: Chronic pain even at rest, difficulty with simple tasks

Report symptoms at Stage 1! Early intervention (task modification, ergonomic adjustments, rest) can prevent permanent damage. By Stage 3, recovery may take months or years.
Slide 8 of 15

Stretches for Office Workers

Desk-friendly exercises

Regular stretching reduces muscle tension, improves circulation, and prevents stiffness. Do these every 1-2 hours.

Neck Stretch
Slowly tilt head toward shoulder, hold 15-20 sec. Repeat other side. Roll shoulders back 10 times. Reduces "text neck" pain.
Shoulder Shrug
Raise shoulders to ears, hold 3 sec, release. Repeat 10 times. Relieves shoulder and upper back tension from typing.
Chest Opener
Clasp hands behind back, straighten arms, lift slightly. Hold 15-20 sec. Counteracts hunched posture, opens chest muscles.
Seated Spinal Twist
Sit tall, place right hand on left knee, twist left. Hold 15-20 sec. Repeat other side. Mobilizes spine, reduces back stiffness.
Wrist Extension
Extend arm, pull fingers back gently with other hand. Hold 15 sec each side. Stretches wrist flexors, prevents carpal tunnel.
Wrist Flexion
Extend arm palm up, pull fingers down gently. Hold 15 sec each side. Stretches wrist extensors, balances forearm muscles.
Ankle Circles
Lift foot, rotate ankle 10 times each direction. Repeat other foot. Improves circulation, reduces leg swelling from sitting.
Seated Cat-Cow
Arch back and look up (cow), then round back and look down (cat). Repeat 5-10 times. Mobilizes entire spine.
Hip Flexor Stretch
Stand, take large step back with one leg, lower hips forward. Hold 15-20 sec each side. Counteracts tight hips from sitting.
✓ Movement is Medicine
Stand and move every 30-60 minutes. Walk to get water, use restroom, deliver documents in person instead of emailing. Take phone calls standing. Use stairs instead of elevator. Movement prevents stiffness and improves focus.
💡 Stretch Tips
  • Breathe normally—don't hold your breath
  • Stretch until mild tension, NOT pain
  • Hold static stretches 15-30 seconds
  • Never bounce or jerk
  • Consistency matters more than duration—daily 5-minute stretching beats occasional 30-minute sessions
Slide 9 of 15

Stretches for Manual Workers

Pre-shift warm-up and work breaks

Warming up before physical work and stretching during breaks reduces injury risk by 50%.

Back Extension
Stand, place hands on lower back, gently arch backward. Hold 10 sec. Repeat 5 times. Counteracts forward bending, relieves lower back compression.
Hamstring Stretch
Prop foot on low step, keep leg straight, lean forward slightly. Hold 20-30 sec each leg. Prevents back injuries from lifting.
Quad Stretch
Stand, pull foot to buttock, keep knees together. Hold 20-30 sec each leg. Prevents knee injuries, improves squat mechanics.
Shoulder Rolls
Roll shoulders backward 15 times, then forward 15 times. Warms up shoulders before overhead work, reduces strain.
Arm Circles
Extend arms to sides, make small circles, gradually larger. 20 circles forward, 20 backward. Warms up shoulder joints and muscles.
Calf Stretch
Step forward in lunge, keep back leg straight, heel on ground. Hold 20-30 sec each side. Prevents Achilles injuries from walking/standing.
Side Bend
Stand, raise one arm overhead, bend sideways. Hold 15 sec each side. Stretches obliques, improves spine flexibility.
Wrist Rotations
Make fists, rotate wrists 10 times each direction. Opens hands wide, spread fingers. Warms up hands before gripping tools.
Knee Bends
Gentle squats (quarter to half depth), 10-15 reps. Warms up knees and leg muscles before lifting or kneeling work.
✓ Pre-Shift Warm-Up Routine (5 minutes)
Before starting physical work:
1. Light cardio: Walk briskly or march in place 2 minutes
2. Dynamic stretches: Arm circles, leg swings, torso twists 2 minutes
3. Job-specific movements: Practice lifting motion, overhead reaching 1 minute

Result: Warmed muscles are more flexible, less prone to strains. Blood flow increases, joints are lubricated.
⚠️ Mid-Shift Recovery Breaks
Take 5-minute stretch breaks every 2 hours during physical work:
• Allows muscles to recover from repeated stress
• Prevents accumulation of metabolic waste products
• Reduces fatigue and maintains performance
• Significantly lowers injury risk

Don't skip breaks to "power through"—fatigue dramatically increases injury risk!
Slide 10 of 15

Ergonomics Key Takeaways

Remember these critical points

Essential ergonomics knowledge:

  • Ergonomics prevents MSDs: Musculoskeletal disorders affect 1.8 million workers annually. Proper ergonomics eliminates most MSDs.
  • Six risk factors: Repetitive motion, forceful exertion, awkward postures, static postures, contact stress, vibration/temperature. Multiple factors compound risk.
  • Office setup - 90-90-90 rule: 90° ankles, knees, hips, elbows. Monitor at arm's length, top at eye level. Wrists straight when typing.
  • Lift with legs, not back: Squat down, keep back straight, load close, stand using leg muscles. NEVER bend at waist or twist while lifting.
  • Get help over 50 lbs: Use mechanical aids or team lifting. Don't lift alone if load is heavy, awkward, or you're fatigued.
  • Repetitive motion injuries: Carpal tunnel, tendonitis, trigger finger develop gradually. Report early symptoms immediately.
  • Vary tasks (job rotation): Switch between different activities to give muscles recovery time. Don't marathon the same task.
  • Take micro-breaks: Every 30-60 minutes, stand, move, stretch. Movement prevents stiffness and reduces injury risk 50%.
  • Stretch daily: Office workers: neck, shoulders, wrists. Manual workers: warm up before shift, stretch mid-shift.
  • Report discomfort early: Stage 1 (mild discomfort) is easiest to fix. Don't wait until chronic pain develops.
✓ Small Changes, Big Impact
You don't need to be perfect—incremental improvements matter!

• Raise your monitor a few inches → Reduces neck strain
• Take one 30-second stretch break per hour → 30% less stiffness
• Squat instead of bending for one lift per day → Builds good habits
• Stand up during one phone call → Breaks up sitting

Start small, build consistency. Your body will thank you!
Quiz Question 1 of 3

Knowledge Check

What is the correct technique for lifting heavy objects?
Bend at the waist with straight legs
Squat down, keep back straight, lift with leg muscles
Keep legs straight and use back muscles to lift
Twist while lifting to face the right direction
Quiz Question 2 of 3

Knowledge Check

Where should the top of your computer monitor be positioned for proper ergonomics?
Well above eye level so you look up
At or slightly below eye level
At chest level so you look down
Position doesn't matter as long as you can see it
Quiz Question 3 of 3

Knowledge Check

Which of the following is a key ergonomic risk factor for developing musculoskeletal disorders (MSDs)?
Taking frequent breaks
Repetitive motions performed thousands of times
Using ergonomic equipment
Stretching before work
Slide 14 of 15

When to Report Ergonomic Issues

Getting help early

🚨 Report These Symptoms Immediately
Don't wait—early reporting prevents permanent injury:
  • Pain, tingling, or numbness that persists overnight or on days off
  • Weakness in hands, arms, or legs
  • Reduced range of motion in joints
  • Symptoms that are getting progressively worse
  • Any discomfort that interferes with work tasks or sleep
✓ What to Expect When You Report
Your employer should:
• Take your concerns seriously—no punishment for reporting
• Conduct ergonomic assessment of your workstation or tasks
• Make reasonable accommodations (adjust equipment, modify tasks, provide tools)
• Refer you for medical evaluation if needed
• Follow up to ensure changes are helping

You have the right to a safe workplace! Reporting ergonomic issues protects you and helps improve conditions for coworkers.
💡 Document Your Symptoms
Keep a log of:
  • When symptoms occur (time of day, during which tasks)
  • Type of pain/discomfort (sharp, aching, tingling, etc.)
  • Severity (1-10 scale)
  • What makes it better or worse
This helps medical professionals and ergonomic specialists identify the cause and solution.
Slide 15 of 15

Take Control of Your Ergonomic Health

Your body is your most important tool

You spend one-third of your life at work. Investing in good ergonomics protects your health for the decades ahead.

✓ Your Ergonomics Action Plan
This week:
• Adjust your chair, monitor, and keyboard to proper positions
• Set hourly reminder to stand and stretch
• Practice proper lifting technique at least once

This month:
• Make stretching a daily habit (morning and during work)
• Request ergonomic assessment if you have discomfort
• Learn to recognize early warning signs in yourself and coworkers

Long-term:
• Maintain good ergonomic habits consistently
• Report new risk factors or changes to your work
• Continue education on ergonomics and body mechanics
💡 Remember
Ergonomics is not "one size fits all." What works for one person may not work for another. Your body is unique—adjust your workspace and techniques to fit YOU. Listen to your body, make adjustments, and don't hesitate to ask for help!

Work smarter, not harder. Protect your body today for a healthier tomorrow! 💪🪑

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