NCIDQ IDFX 2026 – 400 Free Practice Questions to Pass the Exam

The primary purpose of thoracic support in seating is to keep the user's back in contact with the backrest. Proper thoracic support assists in maintaining postural alignment by allowing the back to rest against the backrest, which promotes comfort and reduces the risk of strain during prolonged sitting. When the back is supported, it helps to engage the spine's natural curves, which can alleviate pressure on the lower back and enhance overall sitting posture.

This becomes particularly important in environments where individuals are seated for extended periods, as maintaining contact with the backrest aids in reducing fatigue and discomfort. Proper thoracic support can also contribute to greater stability during various movements, making it easier for users to shift positions without compromising their posture. In contrast, the other options focus on different aspects of seating ergonomics but do not directly relate to the core function of thoracic support.