tablet seat - peter vink at hcdi seminar 18 april 2012
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Seminar Series 2011-12 the Human Centred Design Institute (HCDI) http://hcdi.brunel.ac.uk/seminar.aspxTRANSCRIPT
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Comfort seats:
Influence of laptop and tablet use for
seat design
Prof dr Peter Vink
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Sales 2008 febr 2011
tablet
desk top laptop
2
Source:
HFES2011
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Model of Bubb (2009)
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I H P D
C
E Seat characteristics:
angle, form, pressure
distribution (foam),
adjustability and
human body
movement/variation
of: seat pan, back
rest, neck and head
rest, feet rest and arm
rest.
Person
Usage
Model of Moes (2003)
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comfort
no discomfort
discomfort
history (reference) + state (soft factors)
visual input
noise
smell
temperature/
humidity
pressure
posture/
movement
(Vink, 2005)
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Comfort and posture are related
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Productivity is higher upright
Bronkhorst
et al., 2008
170
175
180
185
190
195
200
upright asymm
nr
of
dele
ted incorr
ect
lett
ers
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(Wilke et.al., 2000)
Laying standing bending sitting1 sitting2
Pre
ssure
in M
Pa
is upright sitting best?
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(Dieën, 2002; Vink & Commissaris, 2005)
st at ic chair syn chair dyn chairstatic synchro dyn
chair chair chair
Body
length
increase Sign*
movement in the chair
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differences in posture
viewpoint
hand
hand-viewpoint connected
seperated
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touchscreen work:
Shin (2011) uni Buffaloo:
-more neck + shoulder muscle activity
-hand higher location and neck bended
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Computer work:
Zhu et al. (2011) uni Buffalo:
armsupport reduces
muscle activity + discomfort
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ideal armsupport ?
Hedge et al. (2011) :
shoulder complaints
24% 16% n=1504)
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armsupport available?
Not always
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is a tablet support available?
does it facilitate
ideal neck and
hand positions?
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this presentation
1 body posture and hand held devices
2 experiments
3 consequences for seat design
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Part 2: experiments
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Experiment 1:
observing 24 passengers 30 minutes
driving in back seat, while: laptopping,
reading a book and tabletting +EMG
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Results (1):
posture strongly determined by car seat
minor sign differences between tasks
-tablet: head bent forward, one
arm supported other free and
touches screen.
-reading: both hands on the
book, one free arm
-laptop: both hands on keyboard
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Results (2):
read
lapto
p
table
t
read
lapto
p
table
t
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experiment 2 in the research chair
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Don’t forget the user:
results: posture, pressure, preference
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Other results:
Neck: highest discomfort.
Self chosen condition:
-discomfort in neck lowest (p=0.001).
-if the back reclines 5° the seat pan 3°
upwards (p=0.027,R=0.667).
-reading: 120-130° back rest angle
preferred
-typing on laptop: back rest forward and
hands upwards
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Experiment 3: observation at home
Cameras while watching TV at home
and in a new lounge TV seat:
-much variation and legs…..
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Legs off the ground!!! (Rosmalen et al 2009)
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4. Study of Gold et al. 2011:
couch position: least discomfort
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5. Study of Kamp & Vink (2011):
Most seen posture in 568 traintravellers
and 175 subjects in public spaces:
64%: using 29%: sleeping
devices watching/relax
no arm
rest use
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this presentation
1 body posture and hand held devices
2 experiments
3 consequences for seat design
![Page 30: Tablet seat - Peter Vink at HCDI seminar 18 april 2012](https://reader033.vdocuments.us/reader033/viewer/2022052521/5412bef37bef0ad8528b837f/html5/thumbnails/30.jpg)
Part 3: consequences for seats
new devices will be there!!!
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Consequences
study 1:
variable arm support
tablet: prevent neck bending
study 2:
support variation
reading backrest 120-130°
key use more upright
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Consequences
study 3: evaluate possibility for
legs off the ground for watching
study 4:
couch position better
study 5:
active device use: more upright