Anthropometry & Physical Dimensions in Ergonomics Flashcards

For designing hand tool handles, which anthropometric measurement is most relevant for determining optimal grip diameter?

Answer: Hand grip circumference (maximum circumference of the closed hand)

Grip circumference describes the hand's wrapping capacity and is the primary determinant of the tool handle diameter that allows adequate force generation and control.

In ergonomic design, 'accommodation percentage' refers to:

Answer: The proportion of the target population whose dimensions fall within the design limits

Accommodation is the fraction of the target population physically served by a design; designing for the 5th–95th percentile achieves 90% accommodation of the population.

Knee clearance height beneath a work surface should be designed based on which anthropometric reference?

Answer: 95th percentile male sitting knee height

Clearance dimensions must accommodate the largest user — the 95th percentile male — so that if the tallest-kneed user fits, all smaller users will also be accommodated.

When applying US anthropometric data to design workstations for a predominantly Asian workforce, the primary concern is:

Answer: Systematic differences in body proportions and absolute dimensions between populations

Different national and ethnic populations exhibit distinct anthropometric profiles and body proportion ratios; applying US data directly to Asian populations can result in systematic design mismatches.

Popliteal height is defined as the distance from:

Answer: The floor to the underside of the thigh just behind the knee

Popliteal height is measured from the floor to the underside of the thigh just posterior to the knee, and is the primary anthropometric basis for seat height design.

The impact of clothing and personal protective equipment (PPE) on workstation anthropometric design is typically addressed by:

Answer: Adding functional allowances to nude anthropometric measurements to account for added bulk

Most anthropometric databases collect nude measurements; ergonomists add functional allowances (additional millimeters) to account for clothing thickness, PPE bulk, and restricted movement before applying data to design.

Which statement correctly distinguishes static anthropometry from dynamic anthropometry?

Answer: Static anthropometry measures body dimensions in standardized rest postures; dynamic anthropometry captures dimensions during movement and task performance

Static (structural) anthropometry records fixed body dimensions in standardized postures, while dynamic (functional) anthropometry captures dimensions during actual movement, yielding more task-relevant design data.