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Do users desire symmetrical lumbar supports in task seating?

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Most people prefer asymmetrical lower back support in chairs, with one side receiving significantly more support. This finding challenges traditional chair design, suggesting a need for adaptable lumbar support systems.

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Area of Science:

  • Ergonomics
  • Human Factors Engineering
  • Biomechanics

Background:

  • Current task chair lumbar supports often feature symmetrical adjustments.
  • User preferences for lumbar support magnitude and location are not well understood.
  • Existing designs may not cater to individual anatomical variations or comfort needs.

Purpose of the Study:

  • To objectively investigate user-defined lumbar support preferences.
  • To determine the preferred magnitude and location of lumbar support.
  • To compare self-selected support with conventional design principles.

Main Methods:

  • An experimental chair with remotely adjustable support (35 diodes) was utilized.
  • Participants self-selected their desired lumbar support.
  • Interface pressure mapping measured support distribution at the user-seat back interface.

Main Results:

  • 73.8% of participants preferred asymmetrical lumbar support (20% difference side-to-side).
  • 16.9% preferred support at least twice as strong on one side.
  • Participants favored asymmetric support over symmetrical configurations.

Conclusions:

  • User-selected lumbar support is predominantly asymmetrical.
  • Task chair design should evolve to incorporate adaptable, location-specific lumbar support.
  • Future adaptable backrests should prioritize user-defined asymmetry for optimal comfort and support.