Which sensor type is typically used to assess sitting posture through pressure distribution?

• A. IMUs
• B. Force sensors
• C. Pressure mapping sensors
• D. EMG sensors

Answer: (C)

To assess sitting posture through pressure distribution, you need a system that images how pressure is spread across the seating surface. Pressure mapping sensors do exactly that: they use an array of sensing elements embedded in a cushion or mat to measure contact pressure at many points simultaneously and produce a pressure map. This spatial distribution lets you see where someone is bearing most of their weight (for example, under the sit bones or toward one side), detect asymmetry, and track how posture changes with movement or over time. That kind of detailed pressure map is essential for evaluating seated alignment, balance, and the risk of pressure-related issues.

In contrast, inertial measurement units (IMUs) track orientation and movement of the body parts but don’t tell you how pressure is applied across the seat. Force sensors can measure pressure at specific points or along a line, giving local force data but not a full distribution map. Electromyography sensors measure muscle electrical activity, not contact pressure at the seating surface. So for capturing how pressure is distributed while sitting, pressure mapping sensors are the best fit.