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Making the Case forErgonomics and Where it
Stands in Mobile TechnologyJack T Dennerlein, PhD
Professor: Ergonomics and [email protected]
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1990 2000 2010 2015
Mobile computer technology has becomeubiquitous and often serves
as a workers
primary computing device
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&
Injury models for computing technologydemonstrate relationships
between
factors and outcomes
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Field studies tell us two things
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201142(2)371378
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Time spent using device associated withthumb, shoulder, and neck
pain
People use the devices in lots of non-desk environments that
lead to a lot ofnon-neutral postures
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Single handed and two-handed useboth utilizing the thumb
accounted forapproximately 95% of all observations
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46%44% 2%
Im all thumbs!
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For single handed use smaller is betterfor thumb posture and
performance
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D to U (B)
SW to NE (B)
L to R (D)
NW to SE (D)
U to D (C)
NE to SW (A)
R to L (B)
SE to NW (B,C)
"inward""outward"
Trudeau Hum Factors. Feb 2012;54(1):52-59.Otten. Hum Factors.
Feb 2013;55(1):48-60
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Thumbs and tablets anda lot of reach
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Smaller (e-reader size) is better for reaching with thumbsas
well as holding the devices. Cases and split keyboardscan help.
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Wrists and tablets
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Extended during typing Deviated while holding
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Head and neck postures are oftenflexed with mobile
technology.
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Take advantage of their mobility dont get stuck in any posture
for
too long and accessorize!
10Cases let us go hands free andimprove viewing angles
Thinner external keyboards get the hands outof the way and
promote straighter wrists
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The state of ergonomics for mobiletechnology is a work in
progress
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THANK [email protected]
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