CIEE Biomechanics & Musculoskeletal Disorder Mechanisms

Question 1

What term best describes the scientific study of forces and their effects on the human musculoskeletal system during work tasks?

Accepted Answer

Biomechanics

Answer

Biomechanics applies principles of mechanics to study how forces act on and within the human body during work activities.

Question 2

Which region of the spine is most frequently injured in work-related musculoskeletal disorders?

Accepted Answer

Lumbar

Answer

The lumbar spine bears the greatest compressive loads during lifting and bending, making it the most common site for work-related spinal injuries.

Question 3

In biomechanics, what is the 'moment arm' (lever arm)?

Accepted Answer

The perpendicular distance from the axis of rotation to the line of force action

Answer

The moment arm is the perpendicular distance from the axis of rotation to the line of action of the force, which determines the torque produced at a joint.

Question 4

What is the NIOSH recommended action limit for compressive force at the L5/S1 lumbar joint?

Accepted Answer

3,400 N

Answer

NIOSH established 3,400 N as the action limit for L5/S1 compressive force, above which the risk of low back injury increases significantly for most workers.

Question 5

Which soft tissue is most prone to cumulative damage from repetitive loading due to its relatively poor blood supply?

Accepted Answer

Tendon

Answer

Tendons have a relatively poor blood supply, which limits their ability to repair micro-damage from repetitive loading, making them highly susceptible to cumulative trauma disorders.

(CIEE) Certified Industrial Ergonomic Evaluator Practice Test

(CIEE) Certified Industrial Ergonomic Evaluator Practice Test

CIEE Biomechanics & Musculoskeletal Disorder Mechanisms