NCIDQ IDFX Practice Exam

What does lumbar support do in an ergonomic chair?

1. Supports feet elevation

2. Restricts movement for better stability

3. Enhances pelvic rotation during movement

4. Promotes blood circulation in the legs

The correct answer is: Enhances pelvic rotation during movement

In ergonomic chairs, lumbar support is designed primarily to provide essential support to the lower back, which significantly impacts overall posture and comfort during prolonged sitting. The lower back, or lumbar region, naturally has an inward curve, and the correct lumbar support helps to maintain this curvature. By enhancing pelvic rotation during movement, the lumbar support allows for a more natural alignment of the spine and encourages proper body mechanics. This alignment is crucial not only for comfort but also for preventing strain and injury. When the pelvis can move easily and is well-supported, the entire spine maintains alignment, which facilitates better movement and reduces the chances of discomfort during activities like reaching or twisting in the chair. Other options, such as supporting foot elevation or promoting blood circulation, may have their own relevance in ergonomic design but they do not specifically pertain to the function of lumbar support. Restricting movement could lead to a rigid seating experience, which contrasts with the intent behind ergonomic support that aims to allow natural movement while providing necessary support.