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.aspx

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Tablet seat - Peter Vink at HCDI seminar 18 april 2012

  1. 1. Comfort seats:Influence of laptop and tablet use forseat designProf dr Peter Vink
  2. 2. Sales 2008 febr 2011 tabletdesk top laptop Source: HFES2011 2
  3. 3. Model of Bubb (2009)
  4. 4. Model of Moes (2003)PersonSeat characteristics: Eangle, form, pressuredistribution (foam),adjustability and Chuman bodymovement/variationof: seat pan, back I H Prest, neck and headrest, feet rest and arm Drest.Usage
  5. 5. history (reference) + state (soft factors)visual inputnoise comfortsmelltemperature/ no discomforthumiditypressure discomfortposture/movement (Vink, 2005)
  6. 6. Comfort and posture are related
  7. 7. Productivity is higher upright 200 nr of deleted incorrect letters 195 190 185 180 175 Bronkhorst 170 upright asymm et al., 2008
  8. 8. is upright sitting best? (Wilke et.al., 2000)Pressure in MPa Laying standing bending sitting1 sitting2
  9. 9. movement in the chair(Dieën, 2002; Vink & Commissaris, 2005) Body length Sign* increase static st at ic chair synchro syn chair dyn dyn chair chair chair chair
  10. 10. differences in posture viewpoint seperated hand hand-viewpoint connected
  11. 11. touchscreen work:Shin (2011) uni Buffaloo:-more neck + shoulder muscle activity-hand higher location and neck bended
  12. 12. Computer work:Zhu et al. (2011) uni Buffalo: armsupport reduces muscle activity + discomfort
  13. 13. ideal armsupport ?Hedge et al. (2011) :shoulder complaints24% 16% n=1504)
  14. 14. armsupport available?Not always
  15. 15. is a tablet support available?does it facilitateideal neck andhand positions?
  16. 16. this presentation1 body posture and hand held devices2 experiments3 consequences for seat design
  17. 17. Part 2: experiments
  18. 18. Experiment 1:observing 24 passengers 30 minutesdriving in back seat, while: laptopping,reading a book and tabletting +EMG
  19. 19. Results (1):posture strongly determined by car seatminor 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
  20. 20. readlaptoptablet Results (2):readlaptoptablet
  21. 21. experiment 2 in the research chair
  22. 22. Don’t forget the user:results: posture, pressure, preference
  23. 23. 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 anglepreferred-typing on laptop: back rest forward andhands upwards
  24. 24. Experiment 3: observation at homeCameras while watching TV at homeand in a new lounge TV seat:-much variation and legs…..
  25. 25. Legs off the ground!!! (Rosmalen et al 2009)
  26. 26. 4. Study of Gold et al. 2011:couch position: least discomfort
  27. 27. 5. Study of Kamp & Vink (2011):Most seen posture in 568 traintravellersand 175 subjects in public spaces: no arm rest use64%: using 29%: sleepingdevices watching/relax
  28. 28. this presentation1 body posture and hand held devices2 experiments3 consequences for seat design
  29. 29. Part 3: consequences for seatsnew devices will be there!!!
  30. 30. Consequences study 1: variable arm support tablet: prevent neck bending study 2: support variation reading backrest 120-130° key use more upright
  31. 31. Consequences study 3: evaluate possibility for legs off the ground for watching study 4: couch position better study 5: active device use: more upright

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