Jsi, Reba, Rula

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DEA4700

© Professor Alan Hedge,

Cornell University, January 2011

Job Strain Index (JSI)

Moore, J.S. and Garg, A. (1995) American Industrial Hygiene Journal 56:443-58.

DEA4700

© Professor Alan Hedge,

Cornell University, January 2011

JSI Ratings
1. Intensity of Exertion 2. Duration of Exertion 3. Efforts per Minute 4. Hand/Wrist Posture 5. Speed of Work 6. Duration of Task per Day

Moore, J.S. and Garg, A. (1995) American Industrial Hygiene Journal 56:443-58.

DEA4700

© Professor Alan Hedge,

Cornell University, January 2011

1. Intensity of Exertion
An estimate of the strength required to perform the task one time. Guidelines for assigning a rating criterion are presented in the following table.

Rating Criterion
Light Somewhat Hard Hard Very Hard Near Maximal

% MSA
=80%

Borg Scale
B

Perceived Effort
barely noticeable or relaxed effort noticeable or definite effort obvious effort; unchanged facial expression substantial effort; changes facial expression uses shoulder or trunk to generate force

7

A B

Percentage of maximal strength Compared to the Borg CR-10scale(76)

Moore, J.S. and Garg, A. (1995) American Industrial Hygiene Journal 56:443-58.

DEA4700

© Professor Alan Hedge,

Cornell University, January 2011

2. Duration of Exertion
Duration of Exertion is calculated by measuring the duration of all exertions during an observation period, then dividing the measured duration of exertion by the total observation time and multiplying by 100.

% Duration of Exertion =

100 x duration of all exertions (sec) total observation time (sec)

Moore, J.S. and Garg, A. (1995) American Industrial Hygiene Journal 56:443-58.

DEA4700

© Professor Alan Hedge,

Cornell University, January 2011

3. Efforts per Minute
Efforts per Minute are measured by counting the number of exertions that occur during an observation period, then dividing the number of exertions by the duration of the observation period, measured in minutes. Efforts per Minute = number of exertions total observation time (min)

Moore, J.S. and Garg, A. (1995) American Industrial Hygiene Journal 56:443-58.

DEA4700

© Professor Alan Hedge,

Cornell University, January 2011

4. Hand/Wrist Posture
Hand/Wrist Posture is an estimate of the position of the hand or wrist relative to neutral position. Guidelines for assigning a rating criterion are presented in the following table. Rating Criterion Very Good Good Fair Bad Very Bad

A

Wrist

ExtensionA 0 -10
o o o

Wrist FlexionA 0 -5
o o o

Ulnar Deviation
A

Perceived Posture perfectly neutral near neutral nonneutral marked deviation near extreme

0 -10
o

o

o

11 -25 26 -40 41 -55 >60
o o o

o

6 -15
o

o

11 -15 16 -20 21 -25 >25
o o o

o

o

16 -30 31 -50 >50
o o

o

o

o

o

o

From derived from data. Moore, J.S. and Garg, A. (1995) American Industrial Hygiene Journal 56:443-58.

DEA4700

5. Speed of Work

© Professor Alan Hedge,

Cornell University, January 2011

Speed of Work is an estimate of how fast the worker is working. Guidelines for assigning a rating criterion are presented in the following table.

Rating Criterion Very Slow Slow Fair Fast Very Fast

Compared to MTM-1A 115%

Perceived Speed extremely relaxed pace "taking one's own time" "normal" speed of motion rushed, but able to keep up rushed and barely or unable to keep up

AThe

observed pace is divided by MTM-1's predicted pace and expressed as a percentage of predicted.

Moore, J.S. and Garg, A. (1995) American Industrial Hygiene Journal 56:443-58.

DEA4700

© Professor Alan Hedge,

Cornell University, January 2011

6. Duration of Task per Day
Duration of Task per Day is either measured or obtained from plant personnel.

Moore, J.S. and Garg, A. (1995) American Industrial Hygiene Journal 56:443-58.

DEA4700

© Professor Alan Hedge,

Cornell University, January 2011...
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