Jsi, Reba, Rula

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