laboratory ergonomics - national university of singapore

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Page 1: Laboratory Ergonomics - National University of Singapore

Laboratory Ergonomics

Page 2: Laboratory Ergonomics - National University of Singapore

Agenda for Today• Ergonomic Risk Recognition• Laboratory Ergonomics• Workshop Ergonomics• Office Ergonomics• Manual Materials Handling• Assignment

Page 3: Laboratory Ergonomics - National University of Singapore

What is Ergonomics?Ergonomics: ‘nomoi,’ natural laws; ‘ergon,’ work.

: science of fitting workplace conditions andjob demands to capabilities of the working population

Musculoskeletal disorders: illnesses and injuries thataffect one or more parts of the musculoskeletal system

Page 4: Laboratory Ergonomics - National University of Singapore

Musculoskeletal Disorder Symptoms (MSDs)

• Discomfort • Pain • Muscle fatigue • Swelling • Inflammation • Stiffness • Numbness • Tingling • Burning sensations • Heaviness • Weakness or clumsiness in the hands (dropping

things)

Page 5: Laboratory Ergonomics - National University of Singapore

Ergonomic Risk Recognition

Page 6: Laboratory Ergonomics - National University of Singapore

Name of Department Location of Lab

Name of Laboratory Name of PI

Name of Researcher/LO Name of Activity/Experiment

No Description/Details of Steps in Activity

Hazards Possible Accident / Ill Health & Persons-at-Risk

Existing Risk Control (Mitigation) Severity Likelihood (Probability)

Risk Level Additional Risk Control Person Responsible By (Date)

1

2 03 04 05 06 07 08 09 0

10 0

Conducted By Approved ByName

Signature

Approval date Next Revision date(Maximum 3 years)

1. Hazard Identification 3. Risk Control

Activity-Based Risk Assessment Form

Page 7: Laboratory Ergonomics - National University of Singapore

Rating Severity Severity meaning Examples

1 Low  No injury, injury or ill‐health requiring first aid treatment only

Minor cuts & bruises, irritation, ill health with temporary discomfort

2 Medium Injury requiringmedical treatment or ill health leading to disability

Lacerations, burns, sprains, minor fractures, dermatitis, deafness, work‐related musculoskeletal disorders

3 High Fatal, serious injury, or life‐threatening occupational disease

Amputations, major fractures, multiple injuries, occupational cancer, acute poisoning and fatal diseases

Page 8: Laboratory Ergonomics - National University of Singapore

Laboratory Ergonomics

Page 9: Laboratory Ergonomics - National University of Singapore

Topics• Pipetting• Pipetting safety (UCLA video)• Microscopy• Biosafety Cabinets and Laboratory Hoods• Microtomes• Cryostats• Flow cytometers• Glove boxes, anaerobic chambers• Micromanipulation, fine motor skills• Musculoskeletal Exercises for Laboratory Personnel• Group exercises• Summary Video (Safety Care)

Page 10: Laboratory Ergonomics - National University of Singapore
Page 11: Laboratory Ergonomics - National University of Singapore

Common MSDs among laboratory personnelDisorder Description Laboratory TasksDe Quervain’stenosynovitis

Tendon sheath swelling, occurs in abductor and extensor tendons of thumb

Forceful grasping or turning of hard objects (e.g., vials)

Rotator cuff tendonitis Inflammation of supraspinatus muscle to upper arm bone

Repetitive tasks where elbows are above mid-torso height

Trigger finger Tendon surface becomes irritated and rough, sheath inflamed and undergoing progressive constriction

Repetitive work opening vials, closing vials, pipetting and cover slip applications

Low back injuries Back muscles, ligaments injured from repetitivepulling, straining

Awkward lifting of centrifuge rotors

NIEHS, 2003

Page 12: Laboratory Ergonomics - National University of Singapore

Pipetting ErgonomicsRisk Factors

• Repetitive motion of the hands, forearm, thumb or fingers

• Pinch grip when handling pipette tips

• Bending and twisting of wrist

• Working with ‘winged’ elbows (i.e., elbow held at an elevated position away from the body)

Control Measures

• Use of electronic, or lightweight pipette

• Alternate right and left hand to pipette

• Multifinger controls• Use pipette that requires

little force. Use minimal pressure

• Limit periods of continuous pipetting to ≤ 20 min

• Work with arms close to body

Page 13: Laboratory Ergonomics - National University of Singapore

Pipetting Ergonomics

Courtesy of University of Guelph

Page 14: Laboratory Ergonomics - National University of Singapore

Pipetting Ergonomics

Courtesy of University of British Columbia

Page 15: Laboratory Ergonomics - National University of Singapore

Pipetting Safety Videohttp://www.youtube.com/watch?v=bqAsXMSs27s

Page 16: Laboratory Ergonomics - National University of Singapore

Microscopy Ergonomics

Risk Factors• Awkward & static posture of

the lower back, neck, head• Lack of adequate leg &

knee clearance • Working with elbows winged• Pinch grip when adjusting

binocular eyepiece• Wrist & palm contact

pressure • Eye strain & fatigue

Control Measures• Keep elbows close to sides• Wrists in neutral (straight)

position• Avoid forearm & wrist contact

pressure• Feet flat on floor and

supported by footrest• Avoid raising shoulders and

bending neck• Use fully-adjustable ergo chair• Use microscope arm supports• Ensure sufficient knee & leg

space• Take microbreaks (20-180 sec

at 10-15 min intervals)

Page 17: Laboratory Ergonomics - National University of Singapore

Recommended Controls based on Duration• 1 - 2 hours a day

- Adequate clearance between thigh and desk with leg free from obstruction

• 2 – 6 hours a day- Microscope tilted slightly forward; use of extended

eyepieces, eye level adjustments- Use armrests, padded edges

• More than 6 hours a day- Adjustable microscope eyepieces- Video monitor/TV screen for examination of repetitive

specimens- Easily adjustable work surface

Page 18: Laboratory Ergonomics - National University of Singapore

Courtesy of NIEHS

Page 19: Laboratory Ergonomics - National University of Singapore

Recommended Eyetubes

Courtesy of University of Guelph

Page 20: Laboratory Ergonomics - National University of Singapore

Adjustable Microscope Tools

Courtesy of University of Guelph

Page 21: Laboratory Ergonomics - National University of Singapore

Microscope Arm Rests

Courtesy of University of Guelph

Page 22: Laboratory Ergonomics - National University of Singapore

Courtesy of Lawrence Livermore National Laboratory

Page 23: Laboratory Ergonomics - National University of Singapore

Biological Safety Cabinet/Fume Hoods: Risk Factors• Repetitive motions of hands, wrist, forearms (e.g., pipetting)

• Constrained knee and leg space

• Contact pressure on forearms, wrists, knees, legs

• Constrained body position

• Working with elbows winged

• Overreaching

• Forward, hunched posture

Courtesy of Yale University

Page 24: Laboratory Ergonomics - National University of Singapore

BSC /Fume Hood Ergonomic Controls• Fully adjustable ergonomic chair, foam padding• Position materials as close as possible to the user to

avoid overreaching• Avoid prolonged contact pressure• Keep view window of BSC clean, line of sight

unobstructed• Use of anti-fatigue mat• Use proper sitting posture & positioning• Take frequent mini-breaks to stretch muscles and relieve

forearm & wrist pressure

Page 25: Laboratory Ergonomics - National University of Singapore

Biological Safety Cabinet: Ergonomic Controls

Courtesy of University of Guelph

Page 26: Laboratory Ergonomics - National University of Singapore

Fume Hoods: Ergonomic Controls

Courtesy of Lawrence Livermore National Laboratory

Page 27: Laboratory Ergonomics - National University of Singapore

Courtesy of University of British Columbia

Page 28: Laboratory Ergonomics - National University of Singapore

Microtome/Cryostat ErgonomicsRisk Factors• Repetitive tasks (e.g.,

replacement of specimens)

• Forceful exertion on microtome wheel

Risk Controls• Retrofit with adapter to allow pistol grip

with handwheel• Reduce force when operating

handwheel• Utilize front pedal type instead of hand-

operated wheel• Apply padding to work surface• Rotate tasks, take frequent short

breaks• Use a fully adjustable ergo chair• Place microtome on appropriate work

height• Adequate clearance for legs, thighs

Page 29: Laboratory Ergonomics - National University of Singapore

Cryostat Ergonomics

Courtesy of University of Michigan

Page 30: Laboratory Ergonomics - National University of Singapore

Cryostat Ergonomics

Courtesy of University of Guelph

Page 31: Laboratory Ergonomics - National University of Singapore

Flow Cytometer ErgonomicsRisk Factors• Frequent lateral bending• Neck and back flexion• Extended arm reaching• Awkward sitting position

Risk Controls• Place a block between flow

cytometer and workbench• Use of hydraulic adjustable

table• Fully adjustable ergo chair

with footrest• Screen display at eye level

Page 32: Laboratory Ergonomics - National University of Singapore

Flow Cytometer Ergonomics

Courtesy of Harvard University

Page 33: Laboratory Ergonomics - National University of Singapore

Glove Chamber Ergonomics

Risk Factors• Extended static loading

on shoulders• Frequent side reaching• Thick gloves

overcompensate on grip strength

Risk Controls• Move materials to main

chamber at one time• Use highly absorbent

hand powder for glove comfort

• Provide anti-fatigue mats• Take short breaks to

perform stretching exercises

Page 34: Laboratory Ergonomics - National University of Singapore

Glove Chamber Ergonomics

Courtesy of University of Guelph

Page 35: Laboratory Ergonomics - National University of Singapore

Micromanipulation ErgonomicsRisk Factors• Repetitive use of

extensor, flexor muscles of fingers, wrist

• Removing caps, lids from vials

• Use of forceps• Reaching into bins• Awkward postures

Risk Controls• Use plastic vials with fewer

threads• Use small pieces of foam where

fingers and forceps articulate• Practice using forceps between

first and second digits of hand• Tilt storage bins toward worker• Take short breaks• Do hand, wrist, forearm exercises

Page 36: Laboratory Ergonomics - National University of Singapore

Pinch Grips

Courtesy of Lawrence Livermore National Laboratory

Page 37: Laboratory Ergonomics - National University of Singapore

Micromanipulation Ergonomics

Courtesy of University of Guelph

Page 38: Laboratory Ergonomics - National University of Singapore

Micromanipulation Ergonomics

Courtesy of Lawrence Livermore National Laboratory

Page 39: Laboratory Ergonomics - National University of Singapore

Moving Centrifuge Rotors• Use a team approach for

lifting heavy centrifuge rotors

• When moving rotors from one area to another, use a cart or trolley

• Use lighter-weight rotors• For very heavy rotors,

implement a pulley system which would attach to the ceiling directly to the centrifuge Courtesy of Yale University

Page 40: Laboratory Ergonomics - National University of Singapore

Musculoskeletal Exercises for Laboratory Personnel

Page 41: Laboratory Ergonomics - National University of Singapore

Shoulder Rolls

• Relax and hang armsat sides.

• Roll shoulders upand backwards 3-5times.

• Repeat in theopposite direction.

Courtesy of UCLA

Page 42: Laboratory Ergonomics - National University of Singapore

Body Reach And Rotation

• Stand as tall aspossible and reacharms up as high aspossible.

• Rotate to the left,then to the right.

• Rotate slowly,repeating 3-5 times.

Courtesy of UCLA

Page 43: Laboratory Ergonomics - National University of Singapore

Backwards Bend

• Stand with hands on hips or in lower back curve.

• Bend back, moving shoulders and head backwards.

• Return to upright position.

• Hold 5 seconds. Relax and repeat 2-3 times.

Courtesy of UCLA

Page 44: Laboratory Ergonomics - National University of Singapore

Overhead Stretch

• Interlace yourfingers above yourhead.

• Turn your palmsupward as you pushyour arms back andup.

• Hold for 20 seconds,then relax andrepeat.

Courtesy of UCLA

Page 45: Laboratory Ergonomics - National University of Singapore

Reaching Stretch

• Interlace your fingersout in front of you atshoulder height.

• Turn your palmsoutward as youreach forward.

• Hold for 20 seconds,then relax andrepeat.

Courtesy of UCLA

Page 46: Laboratory Ergonomics - National University of Singapore

Triceps Stretch• With arms overhead,

hold the elbow ofone arm with thehand of the otherarm.

• Gently pull the elbowbehind your head,creating a stretch.Move slowly.

• Hold for 15 seconds• Repeat with other

armCourtesy of UCLA

Page 47: Laboratory Ergonomics - National University of Singapore

Shoulder Stretch

• Gently pull your elbow across your chest toward your opposite shoulder.

• Hold stretch for 10 seconds.

• Relax and repeat with other arm.

Courtesy of UCLA

Page 48: Laboratory Ergonomics - National University of Singapore

Chest And Back Stretch

• Clasp your handsbehind your back.

• Slowly turn yourelbows inward andstraighten arms.

• Lift your arms upbehind you until youfeel a stretch.

• Hold for 5 -15seconds.

Courtesy of UCLA

Page 49: Laboratory Ergonomics - National University of Singapore

Chair Rotation Stretch• Sit in chair. Wrap feet

around chair legs tostabilize your body.

• Reach across body andgrab the back of thechair

• Pull gently to increasethe stretch in the middleof your back.

• Hold 20 seconds. Repeatreaching to oppositeside.

Courtesy of UCLA

Page 50: Laboratory Ergonomics - National University of Singapore

Forearm Stretch - Extensors• Hold arm out straight at

waist level with your palmdown towards the floor.

• With fingers of the otherhand, gently press downagainst knuckles until youfeel a stretch in the top partof your forearm.

• Keep shoulders relaxed.• Hold for 5 to 15 seconds.

Courtesy of UCLA

Page 51: Laboratory Ergonomics - National University of Singapore

Forearm Stretch - Flexors• Hold arm out straight at

waist level.• Turn your palm up towards

the ceiling and point your fingers down towards the floor.

• With fingers of the other hand, gently press down against your palm and fingers until you feel a stretch in the top of your forearm.

• Keep shoulders relaxed. • Hold for 5 to 15 seconds.

Courtesy of UCLA

Page 52: Laboratory Ergonomics - National University of Singapore

Class Activity

Courtesy of University of Guelph

Page 53: Laboratory Ergonomics - National University of Singapore

Courtesy of Dr. Tessy Joseph

Page 54: Laboratory Ergonomics - National University of Singapore

Courtesy of University of British Columbia

Page 55: Laboratory Ergonomics - National University of Singapore

Laboratory Ergonomics Videohttps://ivle.nus.edu.sg/bank/media/viewmedia.aspx?Ch

annelID=707aadea-2726-4d53-8854-4f325c2ca818&MediaItemID=fcdc4e17-6ae1-4e2a-83f0-0579c90ff0fb&Player=WMP&Referrer=EC&eu=oshbaa

Page 56: Laboratory Ergonomics - National University of Singapore

Ergonomics in Workshops

Page 57: Laboratory Ergonomics - National University of Singapore

Common Activities in NUS Workshops• Drilling• Grinding (bench-mounted, horizontal surface,

pedestal)• Welding (Arc and Gas)• Silver Soldering• Cutting (carbide• Sawing (band saw, circular saw)• Milling• Turning• Pressing (power hydraulic press)• Clamping

Page 58: Laboratory Ergonomics - National University of Singapore

Risk Factors & ControlsRisk Factors• Awkward posture (e.g.,

bending, stooping, reaching)

Risk Controls• Adopt steady posture

Page 59: Laboratory Ergonomics - National University of Singapore

Risk Factors and Controls Risk Factors• Pinch grip

Risk Controls• Power grip

Courtesy of NIOSH

Page 60: Laboratory Ergonomics - National University of Singapore

Risk Factors and ControlsRisk Factors• Use of a tool handle

when hand force is applied horizontally

Risk Controls• Use a tool with bent

handles when force is applied horizontally

Courtesy of NIOSH

Page 61: Laboratory Ergonomics - National University of Singapore

Risk Factors and Controls

Risk Factors• Use of tool with bent

handle when hand force is applied vertically

Controls• Use of tool with straight

handle when hand force is applied vertically

Courtesy of NIOSH

Page 62: Laboratory Ergonomics - National University of Singapore

Risk Factors and ControlsRisk Factors• Use of tool whose handle

is too short

Risk Controls• Use a tool with handle

length longer than widestpart of your hand (4 to 6inches)

Courtesy of NIOSH

Page 63: Laboratory Ergonomics - National University of Singapore

Risk Factors and Controls Risk Factors• Repeated pressure on

finger (e.g., using trigger on power tool)

Risk Controls• Use of battery or

pneumatic-powered tool

Courtesy of NIOSH

Page 64: Laboratory Ergonomics - National University of Singapore

Risk Factors and Controls

Risk Factors• Forceful twisting motions

(e.g., tightening a standard lock nut)

Risk Controls• Pick a tool that will keep

wrist and elbow straight• Use of quick-threading

lock nut

Courtesy of NIOSH

Page 65: Laboratory Ergonomics - National University of Singapore

Gutmann, 2005

Page 66: Laboratory Ergonomics - National University of Singapore

Improving Hand Tool Use

Gutmann, 2005

Page 67: Laboratory Ergonomics - National University of Singapore

Risk Factors and ControlsRisk Factors • Tools having finger

grooves

Risk Controls• Use tools with soft grip

and spring-loaded handle, tools with offset handles

Courtesy of NIOSH

Page 68: Laboratory Ergonomics - National University of Singapore

Risk Factors and ControlsRisk Factors• Operating vibrating tools

(e.g., needle guns,chipping hammers, rotaryhammer drills)

Risk Controls• Use reduced vibration

power tools• Anti-vibration gloves

Courtesy of NIOSH

Page 69: Laboratory Ergonomics - National University of Singapore

Risk Factors and Controls

Risk Factors• Repeated/continuous

contact with non-rounded desk edges, unpadded narrow tool handles)

Risk Controls• Install round or pad

edges of guards, worktables

Courtesy of NIOSH

Page 70: Laboratory Ergonomics - National University of Singapore

Risk Factors and Controls

Risk Factors• Wrist deviations

Risk Controls• Use a turntable to hold

the work

Courtesy of NIOSH

Page 71: Laboratory Ergonomics - National University of Singapore

Office Ergonomics

Page 72: Laboratory Ergonomics - National University of Singapore

Topics• Recognition (checklist)• Chair• Desks• Monitor• Laptops• Keyboard• Computer mouse• Other office accessories• Arranging your office• Office Ergonomics Video (UCLA)• Group exercises

Page 73: Laboratory Ergonomics - National University of Singapore

Common MSDs among office workers

Disorder Description Office TasksCarpal tunnel syndrome Compression of median

nerve of wristTyping, keying

Cubital tunnel syndrome Compression of ulnar nerve below elbow notch

Resting forearm near elbow on hard surface

Neck tension syndrome Irritation of trapeziusmuscle of neck

Typing, keying

Shoulder tendinitis Shoulder disorder of rotator cuff

Packing, storing,reaching, lifting

Thoracic outlet syndrome

Compression of nervesand blood vessels of clavicle

Typing, keying, stacking, material handling, carrying heavy loads with extended arms

Anna (ed.), 2011

Page 74: Laboratory Ergonomics - National University of Singapore
Page 75: Laboratory Ergonomics - National University of Singapore
Page 76: Laboratory Ergonomics - National University of Singapore

Proper Working Posture at the Computer• Feet supported on the floor, or with a footrest• Thighs supported by chair seat with no pressure caused

by front edge of the seat under the thighs• Upper body upright with lower back firmly supported by

the backrest• Shoulders in relaxed position, not hunched• Elbows and upper arms close to the body• Forearms parallel to the ground, wrists in a neutral

position (straight) when utilizing keyboard & mouse• Neck remains in neutral position (i.e., not looking

upwards or downwards) when viewing the monitor

Page 77: Laboratory Ergonomics - National University of Singapore

An “Ergonomic” Chair• 5 caster swivel base• Armrests• Height adjustable seat pan• Tilt adjustable back rest• Seat pan wide and deep enough to fit user comfortably,

adjustable in angle• Padding for low back area that is curved to fit the shape

of the back• Height adjustable back rest• Backrest wide enough to fit the back comfortably

Page 78: Laboratory Ergonomics - National University of Singapore

Desk Arrangement

• Items on desk should be arranged based on their weight, frequency of use• Frequently used items should be located close to the user at a minimal

reach distance.

SS514, 2005

Page 79: Laboratory Ergonomics - National University of Singapore

The Monitor: Good Practices• Screen located approximately an arm’s length away from the

user

• Screen is located directly in front of the user, and can be raised if required

• Top of screen is approximately at eye level. Centre of screen is at shoulder height.

• Glare and reflection on screen are eliminated.

• 20 meters away for 20 seconds every 20 minutes to rest the eyes

Courtesy of Occupational Health Clinic for Ontario Workers Inc.

Page 80: Laboratory Ergonomics - National University of Singapore

Laptop Computers

Courtesy of Occupational Health Clinic for Ontario Workers Inc.

Page 81: Laboratory Ergonomics - National University of Singapore

Laptop Computers: Good Practices• Get a large screen• Place the screen at eye level• Don’t slouch• Use a separate keyboard (for extended periods)• Use a separate mouse• Recline slightly• Knees should be at about the level of your hips• Make your chair work for you• Take a break• Travel light

Page 82: Laboratory Ergonomics - National University of Singapore

Computer Keyboard: Good Practices• Put keyboard slightly below elbow level and close to

body. • Keyboard should be angled in a way that wrist

remains straight

Courtesy of Occupational Health Clinic for Ontario Workers Inc.

Page 83: Laboratory Ergonomics - National University of Singapore

Computer Mouse: Good Practices• Place mouse on mouse mat

• Ensure wrists in neutral position

• Mouse pad should be placed as close as possible to thekeyboard

• Keyboard and mouse should be positioned at the samelevel

Page 84: Laboratory Ergonomics - National University of Singapore

SS 514, 2005

Page 85: Laboratory Ergonomics - National University of Singapore

Office Ergonomic Accessories: Document Holder• Useful for assisting the neck to remain in neutral position• Should be the same distance from the eyes as the

monitor and at the same height as the monitor

Courtesy of Occupational Health Clinic for Ontario Workers Inc.

Page 86: Laboratory Ergonomics - National University of Singapore

Office Ergonomic Accessories: Footrest• Recommended when keyboard users are unable to

firmly position their feet on the ground

Courtesy of Occupational Health Clinic for Ontario Workers Inc.

Page 87: Laboratory Ergonomics - National University of Singapore

Office Ergonomic Accessories: Wrist Rest• Reduce contact pressure on wrists from sharp

workstation edges• Heel of hand should only be resting on wrist pad

when taking a break• Be high enough to keep wrist in straight, neutral

position• Be made of moderately firm and comfortable material

Courtesy of Occupational Health Clinic for Ontario Workers Inc.

Page 88: Laboratory Ergonomics - National University of Singapore

Office Ergonomic Accessories: Headset• Important for ensuring neck remains in neutral

position when phone is used for frequent/extendedperiods of time

• Prevents unnecessary muscle activity of arms andshoulders

Courtesy of Occupational Health Clinic for Ontario Workers Inc.

Page 89: Laboratory Ergonomics - National University of Singapore

Stretches for Wrists and Arms

Courtesy of Occupational Health Clinic for Ontario Workers Inc.

Page 90: Laboratory Ergonomics - National University of Singapore

Stretches for the Neck

Courtesy of Occupational Health Clinic for Ontario Workers Inc.

Page 91: Laboratory Ergonomics - National University of Singapore

Upper Body Stretches

Courtesy of Occupational Health Clinic for Ontario Workers Inc.

Page 92: Laboratory Ergonomics - National University of Singapore

Arranging your Office• Files and books that are used most often should be kept

within reach.• Frequently used files are in the middle drawer or closest

to elbow level• Locking system for filing cabinets so that no more than

one drawer can be opened at once• File and desk drawers should be kept closed when not

in use to avoid trips, bumps and scrapes• Heavy books should be placed on the middle shelf or

around elbow level

Page 93: Laboratory Ergonomics - National University of Singapore

Office Ergonomics Videohttp://www.youtube.com/watch?v=IAMKVJnHNsA

Page 94: Laboratory Ergonomics - National University of Singapore

Exercise

Page 95: Laboratory Ergonomics - National University of Singapore

Exercise

Page 96: Laboratory Ergonomics - National University of Singapore

Manual Materials Handling

Page 97: Laboratory Ergonomics - National University of Singapore

Topics• Definitions• Body physics: core muscles, biomechanics• Risk Factors• Risk Controls• Proper Lifting Techniques: Safe Lifting in Laboratory• Case Studies: group exercises

Page 98: Laboratory Ergonomics - National University of Singapore
Page 99: Laboratory Ergonomics - National University of Singapore

Risky MovesCertain actions are more likely to cause backinjuries than others. Anytime you find yourselfdoing one of these things, you should think:DANGER!My back is at risk!

Heavy lifting...especially repetitivelifting over a long period of time

Twisting at the waist while lifting orholding a heavy load.

Reaching and lifting...over your head oracross a table.

Page 100: Laboratory Ergonomics - National University of Singapore

More Risky Moves

Lifting or carrying objects with awkward  or odd shapes

Working in awkward, uncomfortablepositions...gardening, kneeling, tasks that require you to bend over for long periods of time...

Also, sitting or standing for too longwithout shifting. 

Page 101: Laboratory Ergonomics - National University of Singapore

Core Strength Muscles

Courtesy of Pilates Workers of New York Inc.

Page 102: Laboratory Ergonomics - National University of Singapore

103

Biomechanics of the BackStanding up Straight

23 kg

5 cm

force on spine

4.5 kg

45 kg

25 cm

Adding up load:Load in hands 4.5 kg.Torso weight 45.0 kg.Muscle force 23.0 kg.Total load 72.5 kg.

Lifting Guide:Goal ≤ 347 kilograms

Balancing of forces:(5 cm.) x (n kg.) = (25 cm.) x (4.5 kg.)

n = 23 kg.

Page 103: Laboratory Ergonomics - National University of Singapore

104

Biomechanics of the BackStooping Forward

Adding up load:Load in hands 4.5 kgTorso weight 45.0 kgMuscle force 270 kgTotal load 319.5 kg

270 kg

5 cm

force on spine

25 cm

4.5 kg

45 kg

50 cm

Torso and arm weight

Resultant muscle force

Load in the hands

Lifting Guide:Goal ≤ 347 kilograms

Balancing of forces:(5 cm) x (n kg) = (50 cm) x (4.5 kg) + (25 cm) x (45 kg)

(5 cm) x (n kg) = 225 cm kg + 1,125 cm kgn = 270 kg

Page 104: Laboratory Ergonomics - National University of Singapore

Primary Risk Factors Risk of low back pain injury when lifting/carrying objects depends on 5 main factors:

- Weight of object- Distance of object from body- Body position while carrying/lifting object- Frequency of lift- Twisting while carrying load

Page 105: Laboratory Ergonomics - National University of Singapore

106

Biomechanics of the Shoulder

Preferred posture:Strongest and most stable

Raising the elbow to shoulder height or higher:• Significantly reduces shoulder strength • Increases the risk of injury

Arms close to the sides Arms extended away from the body

Gutmann, 2005

Page 106: Laboratory Ergonomics - National University of Singapore

107

Risks of Pushing and Pulling

MSD injury risk:Upper and lower backHand, arm and shoulderLegs, ankles and feet

Other issues:Feet slipping

Gutmann, 2005

Page 107: Laboratory Ergonomics - National University of Singapore

The Forces InvolvedAnytime you bend or lean over to pick something up withoutbending your knees, you put tremendous pressure on yourlower back.

If your waist is not centered, lifting a 4.5 kg object actually puts45 kg of pressure on your lower back.

Gutmann, 2005

Page 108: Laboratory Ergonomics - National University of Singapore

The further you bend, and the more you extend your arms, the more significant

the risk of injury!

Gutmann, 2005

Page 109: Laboratory Ergonomics - National University of Singapore

Contributing Factors to Handling/Lifting InjuriesPoor Physical Condition…

Stomach muscles provide a lot of the supportneeded by your back.Weak, flabby stomach muscles may preventthe back from getting the support it needs,especially when lifting or carrying heavyobjects.

Page 110: Laboratory Ergonomics - National University of Singapore

Poor postureIt is best to try to maintain the back in its natural "S" shapedcurve. You want to avoid leaning forward (unsupported)when you sit, or hunching over while you're standing.

Contributing Factors to Handling/Lifting Injuries

Gutmann, 2005

Page 111: Laboratory Ergonomics - National University of Singapore

Contributing Factors to Handling/Lifting Injuries

Extra weight…The more you weigh, the morestress it puts on your backevery time you bend over--on a10:1 ratio.

Page 112: Laboratory Ergonomics - National University of Singapore

Risk Factors to Handling/Lifting Injuries

Stress…Tense muscles are more susceptible to strains and spasms.

Page 113: Laboratory Ergonomics - National University of Singapore

Risk Factors to Handling/Lifting InjuriesOverdoing it…Don’t be afraid to say, “This is too heavy forme to lift alone. Will you help me?”

Gutmann, 2005

Page 114: Laboratory Ergonomics - National University of Singapore

Preventing Lifting Injuries

Page 115: Laboratory Ergonomics - National University of Singapore

Basic Guidelines• Plan the lift (3-2-1 LIFT!)• Object closed and centered to the body• Diagonal footing when lifting an object off

the floor• Use ‘core strength’ muscles: upper, middle

and lower abdominal muscles• Bend the knees, lift with the legs• Look ahead• Don’t do it alone

Page 116: Laboratory Ergonomics - National University of Singapore

Preventing Lifting Injuries Avoid Lifting and Bending Whenever You Can!

Place objects up off the floor. Set object to carry downon a table or elevated surface instead of on the floor

Raise / lower shelves. The best zone for lifting is betweenyour shoulders and your waist. Put heavier objects onshelves at waist level, lighter objects on lower or highershelves.

Page 117: Laboratory Ergonomics - National University of Singapore

Safe Lifting in Laboratories

Page 118: Laboratory Ergonomics - National University of Singapore

Small light loads (one person lift)

Courtesy of: Imperial College, London

Page 119: Laboratory Ergonomics - National University of Singapore

Moderately heavy loads (one person lift)

Courtesy of: Imperial College, London

Page 120: Laboratory Ergonomics - National University of Singapore

Large Light Loads (One Person Lift)

Courtesy of: Imperial College, London

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Moderately Heavy/Heavy Loads (2-person lift)

Courtesy of: Imperial College, London

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Moving very large items

Courtesy of: Imperial College, London

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Moving under bench cupboards

Courtesy of: Imperial College, London

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Moving 5-leg chairs: one person lift

Courtesy of: Imperial College, London

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Preparing Gas Cylinders for Transport• Steel toe capped shoes and industrial grade gloves

should be worn• Undo securing bars on trolley and place near/under

cylinder• Unhook chain from the rack and place palm of your hand

on top of cylinder neck• Tilt cylinder slightly forward so it rests on the rim of the

base. Use the other hand to rotate the cylinder from therack to the trolley

• Fasten securing bars on trolley• Place one foot on axle and tilt trolley back so it balances

comfortably on the wheels

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Transporting Gas Cylinders• Cylinders must always be transported in a trolley• NEVER attempt to move a cylinder with a neck higher than

your shoulder• DO NOT lift by the protective cap/guard• Set trolley down in front of the wall rack or bench clamp in

the laboratory• When removing cylinder from trolley, rotate cylinder from

trolley to rack• Make sure cylinder is secured to bench clamp or wall rack• NEVER let a cylinder stand alone with its base unsupported• NEVER transport cylinders with pressure regulator and

hose attached

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Transporting Gas Cylinders

Courtesy of: Imperial College, London

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Exercise

Courtesy of Univ. of Guelph

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Exercise

Courtesy of Univ. of Guelph

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Other Lifting Tips • Reduce the amount of weight to be lifted as much as

possible.

• Keep a clear view ahead when carrying/moving a load.Never carry a load in front of your face.

• Use handles and lifting straps

• Push a dolly or cart in a linear motion. Never pull, asit forces you to twist at the waist!

• Get help if the shape is too awkward or the object istoo heavy for you to lift and move by yourself!

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• Know your body's limitations. Be aware of yourbody position at all times

• Learn to recognize situations where your back ismost at risk: bending, lifting, reaching, twisting,etc.

• Take measures to avoid an injury by using thistraining whenever you handle or lift materials

Practice Body Management

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Case Study Activity• A full 10 litre mobile phase container had to be

manually handled from a trolley onto the top of aHPLC machine. This was performed once a day.

• When full, the container weighed 14kg. The lift fromthe trolley to the HPLC was a short distance butrequired the lifter to handle the container with theirarms outstretched at or above shoulder height.

• The container was also difficult to handle as therewere no handles and it has a smooth glass surface.It could easily be dropped creating a safety hazard inaddition to the musculoskeletal risk.

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Gutmann, 2005

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The Solution• The nature of risk came mainly from a combination of the weight and position

of the load. Thus the short-term solutions focused on reducing the weight ofthe container and relocating it into a more convenient position. This wasachieved by introducing a 5 litre container and to cease using the 10 litrecontainer.

• This resulted in the weight being halved to 7kg per container. Female membersof staff now feel able to handle the containers much more comfortably.

• Relocation of the container was affected by re-organising the HPLC machinesto allow for adequate space on the worktop. This involved simply removing thetop two sections of the machine and placing them by the side, allowing thecontainer to then be placed on top of them. This resulted in the container beinghandled just above waist height whilst being able to keep the arms closer tothe body during handling. This approach has now been adopted generically forHPLC machines within the laboratories.

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Gutmann, 2005

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Class Activity

Courtesy of Dr. Tessy Joseph

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Assignment• Download and print the Laboratory Ergonomics

Checklist found at the OSHE Staff Portal, under“Ergonomics” tab. Fill out the checklist manually.

• For any ‘No’ ticks, fill out the necessarychanges/modifications to be adopted. If thechange/modification is missing from the list, proposeyour own under the ‘Comments’ column

• Only fill out the appropriate tool/equipment you use inthe laboratory. For tools/equipment not used, leave thatsection blank

• Scan checklist and email to: [email protected] on orbefore April 25, 2012

• Only participants who completed the checklist will beawarded a Certificate of Completion

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Office and Laboratory Ergonomics Manuals