Ergonomic Interventions & Solutions Flashcards

A CPE is evaluating a production line where workers sort small parts under magnification. The recommended illuminance level for fine inspection tasks according to the IES Lighting Handbook is closest to:

Answer: 1000–2000 lux or more

Fine and precise visual inspection tasks typically require 1000–2000 lux of task illuminance per IES standards, significantly higher than general office or assembly lighting.

A construction ergonomist recommends knee pads for workers who kneel on hard surfaces for more than 30 minutes continuously. This recommendation primarily addresses which risk factor?

Answer: Contact stress and sustained awkward posture

Prolonged kneeling creates sustained contact stress on the prepatellar bursa and maintains the knee in a highly flexed posture, both of which knee pads directly mitigate.

A cold storage warehouse requires workers to handle product at -10°F. Which ergonomic intervention is MOST critical in this environment beyond standard PPE?

Answer: Providing insulated anti-fatigue matting to reduce cold floor conduction through feet and legs

Cold conduction through the feet reduces tactile sensitivity and increases grip force demands; insulated matting is a direct engineering control that mitigates cold-related musculoskeletal and vascular risk.

An ergonomist discovers that a newly installed ergonomic intervention is disliked by workers and being bypassed. According to change management principles, the BEST next step is to:

Answer: Conduct a follow-up session with workers to identify specific concerns and co-develop modifications

Engaging workers in follow-up problem solving addresses root concerns, improves buy-in, and often yields practical modifications that make the intervention more effective and acceptable.

Which ergonomic intervention most effectively reduces whole-body vibration exposure for a forklift operator working a full shift?

Answer: Installing a suspension seat engineered to attenuate the primary resonance frequency of the vehicle

A suspension seat tuned to attenuate the vehicle's dominant vibration frequency directly reduces the vibration transmitted to the operator's body — the highest-efficacy engineering control for WBV.

A batch of ergonomic scissors with spring-loaded return is introduced to replace standard scissors in a fabric-cutting task. The PRIMARY biomechanical benefit is:

Answer: Elimination of the closing-grip force, reducing flexor tendon load and repetitive strain

Spring-return scissors eliminate the need for the worker's finger extensors to re-open the blades, cutting the number of forceful muscle contractions per cycle roughly in half.

Cost-benefit analysis of an ergonomic intervention should include which of the following indirect cost categories?

Answer: Workers' compensation premiums, lost productivity, turnover, retraining costs, and quality defects attributable to fatigue

Indirect costs — including lost productivity, turnover, quality losses, and increased insurance premiums — typically represent 4–10 times the direct medical costs of a work-related injury and must be included for a complete business case.