Analyzing Comfort of CoreChair through Pressure Map and Self-Report Questionnaire

CoreChair is described as a "revolutionary chair that encourages active sitting." This project was part of Professor Alan Hedge's Ergonomics course (DEA 6510) at Cornell University . My team was prompted to create, conduct, and analyze a an empirical study of the CoreChair. Our study investigated the perceived comfort of CoreChair. I collaborated with two engineering graduate students to produce a final report and presentation to the CEO of CoreChair.

Research Experiment Timeline

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Our project analyzed the comfort of CoreChair through anthropometric data (pressure mapping) and qualitative data (self-report questionnaire). Subjects were asked to conduct a typing task in both a standard ergonomics task chair and CoreChair for 5 minutes. Comparing pressure map data against hip-width measurements, allowed us to better understand we focused on plotting average pressure vs hip width, overall comfort rating, seat contour, and seat width.

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CoreChair Pressure Mapping VS Standard Ergonomic Chair Pressure Mapping

Number of pressure points with a range between 80 to 200 mmHg (Red Region) were totaled for both a standard ergonmic chair and CoreChair. Results, as seen below, indicate that CoreChair has less pressure points, on average, then a standard ergonomic chair. Decreased pressure points were correlated with an incease in comfort.

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Number of pressure points with a range between 80 to 200 mmHg (Red Region) were totaled for both a standard ergonmic chair and CoreChair. Results, as seen below, indicate that CoreChair has less pressure points, on average, then a standard ergonomic chair. Decreased pressure points were correlated with an incease in comfort.

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Seat contour rating is from a scale of 1 to 5 where 1 is not enough, 5 is too much, and 3represents perfect. A perfect score (3) is only given by people withan average pressure between 29-33 mmHg. A perfect score (3) is only given by people with a hip width between 13.5”-16”. This only represents 46.5% of thepopulation. Conclusions from this data is that CoreChair should redesign the seat contour to accommodate people of varying hip widths and average pressures. To accommodate for 95% of the population, the CoreChair should fit hip widths between 11.95”and 15.5.”

Overall conclusions from the study include:

  1. Pressure mapping analysis indicated that CoreChair exerts less pressure points then a standard ergonomic task chair
  2. Survey questions indicate that CoreChair has a good level of comfort, but could be softer, more spacious, and more aesthetically pleasing
  3. Comfort decreases as average pressure increases.
  4. Higher hip width leads to higher average pressure.
  5. The seat width was measured comfortable by users, regardless of hip width.
  6. Seat contouring was only comfortable for hip widths between 13.5”-16.” Because of that, the seat contour could be redesigned for a wider range of hip sizes.
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