NCIDQ IDFX Practice Exam

Which ergonomic element is crucial for independent movement of the upper body in a chair?

1. Contoured backrest

2. 5 prong base

3. Casters

4. Foam construction

The correct answer is: Contoured backrest

The selection of a contoured backrest is vital for facilitating independent movement of the upper body in a chair because it provides the necessary support to the natural curvature of the spine. This design allows the user to maintain proper posture while enabling freedom of motion when leaning, reaching, or turning. A contoured backrest helps to align the user's spine, which can enhance comfort and reduce fatigue during extended periods of sitting, thus promoting better movement dynamics. While features such as a 5-prong base, casters, and foam construction contribute to stability, mobility, and comfort, respectively, they do not specifically cater to the independent movement of the upper body. The base provides support and stability without affecting torso movement, casters allow for mobility across surfaces rather than upper body dynamics, and foam construction primarily impacts comfort rather than facilitating independent upper body movement.