Ergonomics and Biomechanics Flashcards

Which of the following best describes the 'neutral posture' in ergonomics?

Answer: Joints held at their mid-range positions minimizing tissue stress

Neutral posture keeps joints near mid-range, reducing loading on muscles, tendons, and ligaments.

The NIOSH Lifting Equation Recommended Weight Limit (RWL) is calculated from the load constant of 51 lbs multiplied by how many task-specific multipliers?

Answer: 6

The RWL uses six multipliers: horizontal, vertical, distance, asymmetry, frequency, and coupling.

A worker reports numbness and tingling in the thumb, index, and middle fingers. Which nerve is most likely compressed?

Answer: Median nerve

The median nerve passes through the carpal tunnel and innervates the thumb, index, and middle fingers.

What does the term 'coupling' refer to in the context of the NIOSH Lifting Equation?

Answer: Quality of the hand-to-object interface

Coupling describes how well a worker can grip the load, ranging from good (handles) to poor (no grip points).

Which anthropometric measurement is most critical when designing a seated workstation keyboard height?

Answer: Elbow height while seated

Seated elbow height determines the optimal keyboard height to maintain neutral wrist and shoulder posture.

Repetitive pinch grip tasks are especially associated with increased risk of which musculoskeletal disorder?

Answer: De Quervain's tenosynovitis

De Quervain's tenosynovitis affects the tendons of the thumb and is aggravated by repeated pinching and twisting.

In whole-body vibration exposure assessment, which ISO standard is most commonly referenced?

Answer: ISO 2631

ISO 2631 provides guidance for measuring and evaluating whole-body vibration exposure and its health effects.