Psyc 552 Ergonomics & Biomechanics Lecture 6

Anthropometry  Antro = man, metry = measure  Terminology Height: Breadth: Depth:

Distance: Curvature: Circumference: Reach:

Workstation Analysis Images from:

Image from: Workspace envelope

Measurement Methods  Grid reference  Jig measurement  Anthropometers  Rod sets, castings  Photographs – stereo photography  Electromechanical probes  Lasers Image from:

Measurement tools Images from:

Image from: D.J. Feathers et al. / International Journal of Industrial Ergonomics 33 (2004) –190

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A 19th-century bodice-measuring device comprising several sections which could be adjusted to fit the figure. The strips could then be laid flat upon the materials to be cut. (Image: U.S. Patent no. 320,496, William Bloomer Pollock, 1885) Image from and text from:

Other Imaging  Ultrasound imaging  Magnetic Resonance Imaginge  X-rays

Sources of Data  For Civilians  For military

Characteristics of data  Normally distributed  Can be used to calculate intervals  Correlations  Limited

Functional Anthropometry  Reach data  Seat…

Factors Affecting Anthropometry  Genetics  Environment  Ethnic…  … Image from: &w=499&sz=12&tbnid=6X9096fQL5oJ:&tbnh=129&tbnw=120&prev=/images%3Fq%3Dponce%2Bde%2Bleon%26hl%3Den%26lr%3D&oi=imagesr&start=1

Anthropometry & Biomechanics  In biomechanics the human body is considered to be a system of links with each link of known physical size and form.  Links are defined as…

Locating Centers of rotation  Method involves…  Bony landmarks are highly correlated with link lengths

Body Segment Volume and Weight  Body segment mass and volume are related by the density of the segment. D = M/V = (W/g)/V

Body Segment Center of Mass  Center of mass is that point where if the segment is suspended that the gravitational effect is equal. It is the location where the gravitational effect can be considered to act.  Location methods…

Inertia Properties  Rotational inertia  Radius of gyration

Measuring Joint Motion  Difficulties and descriptive requirements

Tools  Goniometers  Flexometer/ Inclinometer  Photo or video methods Image from:

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