Civil Engineering Reference
In-Depth Information
TABLE 43.5 Postural Classification Scheme for the Neck
Posture and Discomfort Score
Sitting Posture
Standing Posture
Relative
Discomfort Score
Relative
Discomfort Score
Joint Motions
Class
Class
Flexion
0-20
8
1
0-20
8
1
20-45
8
3
20-45
8
3
45
8
5
45
8
5
.
.
Extension
0-30
8
1
0-30
8
1
30-60
8
6
30-60
8
4
60
8
12
60
8
9
.
.
Lateral bending
0-30
8
1
0-30
8
1
30-45
8
3
30-45
8
2
.
458
10
.
458
7
Ulnar deviation
0-308
1
0-308
1
30-608
2
30-608
2
.
608
8
.
608
8
or those that the worker itself (or the observer) considers as stressful to the muculoskeletal system. Third,
each joint motion observed in the selected postures is assigned a relative discomfort score according to
the above classification scheme. It is recommended that only the right or left of the upper body, which
seems to be more stressful of two body sides, be assessed at a time.
Figure 43.1 makes it easy and fast for the posture analysts to classify working postures, where they just
tick the corresponding item for each joint motion. After completion of posture classification, the postural
load for the selected posture can be obtained by summing up the respective discomfort score values
ticked in Figure 43.1. Fourth, the following equation is used to calculate the postural load index for
joint motions deviated from their neutral positions in the chosen postures, that is, for joint motions
TABLE 43.6 Postural Classification Scheme for the Back
Posture and Discomfort Score
Sitting Posture
Standing Posture
Relative
Discomfort Score
Relative
Discomfort Score
Joint Motions
Class
Class
Flexion
0-208
1
0-308
1
20-608
3
30-608
3
.
608
10
60-908
6
.
908
12
Extension
nm
nm
0-108
1
10-208
4
20-308
8
.
308
15
Lateral bending
0-108
1
0-108
1
10-208
3
10-208
4
20-30
8
9
20-30
8
9
.
30
8
13
.
30
8
13
Rotation
0-20
8
1
0-20
8
1
20-30
8
2
20-60
8
3
30-45
8
7
.
60
8
10
.
45
8
11
nm: not measured.
Search WWH ::
Custom Search