Ergonomics

Question 1

where does the line of gravity pass during active erect sitting?

Answer 1

posterior to hip

Question 2

what is active during active erect sitting?

Answer 2

most muscle activity

increase interdiscal pressure compared to standing

Question 3

where does the line of gravity fall during relaxed erect sitting?

Answer 3

anterior to the acromion, spine, and hips

Question 4

what is active during relaxed erect sitting?

Answer 4

moderate intradiscal pressure, tension on posterior annulus, flexion relaxation phenomenom

Question 5

which position (of the three) do you get least muscle activation?

Answer 5

relaxed erect sitting

Question 6

where does the line of gravity sit in a slumped sitting posture?

Answer 6

far anterior

Question 7

what occurs during slumped sitting posture?

Answer 7

most interdiscal pressure
most tension on posterior annulus
tension on posterior ligaments
forward head

Question 8

what are the effects of lumbar support?

Answer 8

increased lumbar lordosis
increased anterior pelvic tilt
decreased paraspinal activity
decreased disc pressure

Question 9

how far should your back be from the seat in order to allow for lumbar support?

Answer 9

5 cm

Question 10

what will allow for a decrease in IV disc pressure?

Answer 10

recline in 110-130 degrees

Question 11

how far posterior should the seat pan be?

Answer 11

5 degrees

Question 12

how far should the monitor be away from you?

Answer 12

45-70 cm

18-28 inches

Question 13

where should your arms be placed when sitting at desk? thighs?

Answer 13

90 degrees of elbow flexion or tilted, 20 degrees of wrist extension; thighs slightly tilted

Question 14

what is forward head posture measured with?

Answer 14

cranioverebral angle

horizontal line from tragus to C7

Question 15

what measurement is forward head posture indicated as?

Answer 15

less than 50 degrees

Question 16

what is a craniovertebral angle less than 50 degrees associated with?

Answer 16

c/s pain

fall risk

Question 17

how many fingers should be between the edge of the chair and calf?

Answer 17

2-3

Question 18

where should the monitor be placed?

Answer 18

15 to 20 degrees below line of sight

Question 19

how should you place the monitor in respect to the keyboard?

Answer 19

squared

Question 20

what should you have around the wrist?

Answer 20

support

Question 21

where should the forearms rest?

Answer 21

on armrest

Question 22

how should the trunk be positioned in the work station?

Answer 22

slight recline

Question 23

how should the thighs be positioned?

Answer 23

90 degrees to spine

Question 24

how should the neck be positioned?

Answer 24

neck in neutral

Question 25

what should you avoid in terms of forearm and wrist?

Answer 25

avoid resting forearm and wrist on objects