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Applied Anthropometric and Workplace Applied Anthropometry and the Workplace Anthropometry A. Description of the physical variation in humans by measurement; a basic technique of physical anthropology. B. The measurement of the dimensions and certain other physical characteristics of the body.

Applied Anthropometric and Workplace Applied Anthropometry and the Workplace Anthropometry A. Description of the physical variation in humans by measurement;

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Applied Anthropometric and Workplace

Applied Anthropometry and the Workplace

Anthropometry

A. Description of the physical variation in humans by measurement; a basic technique of physical anthropology.

B. The measurement of the

dimensions and certain other

physical characteristics of the

body.

Applied Anthropometric and Workplace

Measuring Types

A. Static (structural) - taken while the body is in a static position

1. Skeletal dimensions - joint-to-joint

measurement

2. Maximum body width

3. Data available on most

characteristics of the body

NASA Anthropometric Source

Book. (vol 2, 1978)

Applied Anthropometric and Workplace

Measuring Types

B. Dynamic (functional)

1. Measurements taken while the body is engaged in some kind of activity

a. Driving a car

b. Working at a desk / VDT

terminal

Applied Anthropometric and Workplace

Applications

Principles

1. Design for extremes of individuals (or the population)

a. Maximum: automobile interiors, escape hatches, doorway

b. Minimum: applied force, reach distances

c. Most designs cover 5th

through 95th percentile

Applied Anthropometric and Workplace

Principles

2. Design with an adjustable range

a. Design should "fit" 5th through 95th percentile of relevant population

b. Involves a trade-off with cost/complexity

3. Design for the average

- vs. design for the extreme(seat height, counter tops,

letter height)

Applied Anthropometric and Workplace

4. Variability of population -

Anthropomorphic measurements are a functionof age, gender, nationality, user type and several other factors

Principles

Applied Anthropometric and Workplace

Applications of Design Principles

A. Bittner

Taking 13 dimensions between 5th

and 95th percentile excluded 52% of the population

B. Body dimensions are not perfectly correlated

Short legs with a long torso

in automobile design

Applied Anthropometric and Workplace

Applications of Design Principles

C. Physical modeling

1. Computer programs to model

human movement

2. Dummies are used to represent specific percentiles

- crash tests for autos

Applied Anthropometric and Workplace

General Approach for Design Evaluation

A. Determine the body dimensions which will be important in the use of the system

B. Define the relevant (user) population

C. Which design principle

will be used

Applied Anthropometric and Workplace

D. What percentage of the population it is to be designed for

E. Determine the relevant value from the anthropomorphic tables

F. Add appropriate allowances for special situations

General Approach for Design Evaluation

1. Bulky clothing worn in

cold weather

2. Protective clothing worn by

hazardous duty personnel

Applied Anthropometric and Workplace

Work Spaces (Envelopes)

A. Work Space Envelope

Defined as the 3-dimensional space around an individual in which it is reasonably optimal for persons to perform some type of manual activity

B. Seated personnel

1. Most important factor in this position is arm reach

a. direction ofreach

b. task to be performed (grasp, fingertip operation)

c. type of reaching motion (restricted/unrestricted)

Applied Anthropometric and Workplace

2. Design for the minimum (5th percentile) - Makes it useful for 95% of the population

3. Consider apparel worn

C. Standing Personnel

Work Spaces (Envelopes)

1. vs. seated

a. Larger workspace is defined

(due to ability to bend/reach)

b. Workspace is dynamic

(moves as the person moves)

Applied Anthropometric and Workplace

Work Spaces (Envelopes)

D. Clearance Requirementsworkers need to fit into awkward or

restrictive spaces sometimes.

i.e. maintenance or emergency hatches.

Applied Anthropometric and Workplace

Work Surfaces

A. Horizontal Surfaces (tables, desks, counters)

1. Normal area - area covered by

sweep of the forearm while the upper arm remains in a natural position

2. Maximum area - area which

can be reached by extending

the arm from the shoulder

Applied Anthropometric and Workplace

B. Slanted Surfaces

vs. horizontal

a. Eastman and Kodat (use of slanted surfaces, 12-24 degrees, gives better posture, less fatigue/discomfort

b. Drafting tables, computer keyboards

C. Height of Work Surfaces

Work Surfaces

Applied Anthropometric and Workplace

Work Surfaces

Guidelines

a. Make it adjustable where possible (legs/feet, slant)

b. Forearm should be level of

slightly down with shoulders relaxed (not hunched)

c. Allow for a "straight" spine

(posture) to reduce strain and fatigue in the back muscles/spine

d. Adjustable for type of activity

to be performed

Applied Anthropometric and Workplace

Work Surfaces

2. For Standing Personnel

a. Precision work (work level even

with or slightly above elbow height)

b. Light / Heavy work (work level should be below elbow height)

Applied Anthropometric and Workplace

Seating

Principles of Seat Design

1. Back support should be used

a. Lower support most critical to reduce fatigue and eliminate back pain

b. Lordotic (concave) preferred over Kyphotic (convex)

Applied Anthropometric and Workplace

2. Seat height and slope

Seating

a. Generally, seat height should

be low enough so as to reduce

pressure on the underside of

the thigh (reduces blood flow

to the legs)

b. Common to design seats for

minimum (5th percent)

Applied Anthropometric and Workplace

3. Seat depth and width

a. For public seating, depth should be designed for a minimum while the width should be designed for the maximum

Seating

b. Spacing between seats

should be at least 20 inches

Applied Anthropometric and Workplace

Guidelines for Seat Design

A. Seat back should provide support for lumbar (lower) area

B. Seat back should have moderate inclination (10-30 degrees)

C. Seat pan should slope back slightly

D. Angle between seat pan

and back is 95-120 degrees

Applied Anthropometric and Workplace

E. Seat height and backrest should be adjustable

F. Seat height designed for small people, width for large people

G. Use moderately contoured seat pan for weight distribution

Guidelines for Seat Design

Applied Anthropometric and Workplace

Seat Height and Slope:- fixed height: 18 - 19”

- adjustable height: 16 - 20.5”

- slope: 0 - 10o backward tilt

Seat Depth and Width:- depth: 15 - 17”

- width: 18.2”

Guidelines for Seat Design: ANSI Standard

Applied Anthropometric and Workplace

Guidelines for Seat Design: ANSI Standard

Contour and Cushioning:- contour: tradeoffs between even

weight distribution vs. restricting movement and postural fixity.

- cushion: 1.5 - 2” thick.

Seat Back:- angle: minimum 90 - 105o with

respect to the seat pan. Up to 120o prefered.

- width: minimum 12” in the lumbar region.

- height: minimum 19.5”.

- lumbar support: 6 - 9” high, 12” wide, positioned 6 - 10” above seat reference point, and protrude ~ 2” from back rest.