An Objective Measure for Postural Comfort

Biomechanics determines the physical range in which humans can move their bodies. Human factors research delineates a subspace in which humans can operate without experiencing musculoskeletal strain, fatigue or discomfort. We claim that there is an even tighter space which we call the comfort zone. It is defined as the range of postures adopted voluntarily — despite the availability of other postures. We introduce a measurable, objective foundation for comfort, which was previously assumed equivalent to the absence of discomfort, a subjective quantity. Interfaces designed outside a user's comfort zone can prompt the adoption of alternative use patterns, which are often less favorable because they trade off the unnoticeable potential of injury for comfort. Designing interfaces within the limits of comfort zones can avert these risks.

[1]  D. Chaffin.  Localized muscle fatigue--definiton and measurement. , 1973, Journal of occupational medicine. : official publication of the Industrial Medical Association.

[2]  E N Corlett,et al.  A technique for assessing postural discomfort. , 1976, Ergonomics.

[3]  G. Borg.  Psychophysical bases of perceived exertion. , 1982, Medicine and science in sports and exercise.

[4]  Christopher S. Pan,et al.  Performance variability as an indicator of fatigue and boredom effects in a VDT data-entry task , 1994, Int. J. Hum. Comput. Interact..

[5]  D B Chaffin,et al.  Arm Posture and Human Movement Capability , 1989, Human factors.

[6]  R Kadefors,et al.  Subjective and objective evaluation of shoulder muscle fatigue. , 1994, Ergonomics.

[7]  E. Grandjean,et al.  Fitting the task to the man: An ergonomic approach , 1980 .

[8]  Inseok Lee,et al.  A postural workload evaluation system based on a macro‐postural classification , 2002 .

[9]  Etienne Grandjean.  Fitting the task to the man , 1969 .

[10]  C G Drury,et al.  Posture, Postural Discomfort, and Performance , 1985, Human factors.

[11]  W Karwowski,et al.  The effects of computer interface design on human postural dynamics. , 1994, Ergonomics.

[12]  C G Drury,et al.  Posture, discomfort and performance in a VDT task , 2000, Ergonomics.

[13]  Gavriel Salvendy,et al.  Handbook of Human Factors and Ergonomics , 2005 .

[14]  Dohyung Kee,et al.  A method for analytically generating three-dimensional isocomfort workspace based on perceived discomfort. , 2002, Applied ergonomics.

[15]  Mathias Kölsch,et al.  The Postural Comfort Zone for Reaching Gestures , 2003 .

[16]  C G Drury,et al.  A methodology for chair evaluation. , 1982, Applied ergonomics.