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Prevention of MSDs by workload optimization based on external and internal load assessment methods. Danuta Roman-Liu Central Institute for Labour Protection – National Research Institute. Work incapacity due to MSDs in 2003 - 2005.

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prevention of msds by workload optimization based on external and internal load assessment methods

Prevention of MSDs by workload optimization based on external and internal load assessment methods

Danuta Roman-Liu

Central Institute for Labour Protection – National Research Institute

sectors with the highest rate of msds according to polish national labour inspectorate
Sectors with the highest rate of MSDs (according to Polish National Labour Inspectorate)
  • transportation
  • agriculture, fishing, forestry
  • mining
  • building industry,
  • wholesale and retail trade
  • hotels and restaurants,
  • health care
risk factors for msds
Risk factors for MSDs

Work environment

٭Biomechanical factors

posture

force

time sequences

٭Psychosocial factors

job demands

control

social support

Individual characteristics

٭Genetically determined inclination to diseases

٭Personality

٭Gender

٭Age

٭Physical capacity

  • Home environment
  • ٭Leisure time
  • ٭Diet
  • ٭Sport
external and internal load at the work stand
External and internal load at the work stand

External load can be assessed as a function of parameters describing performed task (body parts configuration, exerted force, time).

Internal load is the reaction of musculoskeletal system to the external load.

Methods:

  • NIOSH
  • OCRA
  • OWAS
  • LIMB

Methods:

  • sEMG
  • ECG
  • HR
  • Oxygen consumption
  • Subjective assessment
assessment of muscle load and fatigue using s emg
Assessment of muscle load and fatigue using sEMG

Placement of sEMG electrodes

sEMG registered from four upper limb muscles

packing stand involving repetitive tasks
Packing stand involving repetitive tasks

After intervention

intervention

Before intervention

musculoskeletal load assessment on the bale opener work stand
Musculoskeletal load assessment on the Bale Opener work stand

Workers at the „Bale Opener” work stand reported pain in wrist and hand.

Musculoskeletal load of upper limb was assessed by means of sEMG.

load level of examined muscles during each of cycle phases

[% MVC]

[% MVC]

100

FCU

RMG

90

80

70

60

50

40

30

20

[% of cycle time]

[% of cycle time]

10

0

0

20

40

60

80

100

[% MVC]

ECR

[% of cycle time]

Load level of examined muscles during each of cycle phases
results
Results

Analysis of musculoskeletal load of forearm and hand shows that:

٭high musculoskeletal load of hand

٭lower, however still high, musculoskeletal load of forearm

٭the highest musculoskeletal load during tasks of cutting ties and this can cause upper limb pain

٭an important factor in the development of pain symptoms can be the shape of steering device, which is the main cause of musculoskeletal load in phases of steering the lift

Indicators for ergonomic intervention

♦Changes of the shape of steering device by having it smaller and lighter with shape fitting the hand and decreasing the push button force.

♦Reduction of musculoskeletal load during cutting ties can be reached by implementation of scissors with pneumatic, hydraulic or electric aid.