Which is an example of Nagi's model application?

Nagi's model provides a framework for understanding how disease and disability affect functioning and overall health. It describes how specific medical conditions can lead to functional limitations and disabilities in various aspects of life. In the context of this model, multiple factors such as pathology, impairment, functional limitations, and disability are interconnected.

The example of MS (Multiple Sclerosis) leading to decreased muscle strength illustrates a clear connection within Nagi's model. MS is a chronic disease of the central nervous system that can cause significant impairment. This impairment—manifested as decreased muscle strength—may directly affect functional abilities, making it harder for individuals to perform daily activities effectively. In this way, the application of Nagi's model is reflected through the relationship between a specific pathology (MS) and its consequences in terms of muscle strength, which is a component of physical function.

Other options do not accurately illustrate this relationship because they either suggest improvements in abilities due to conditions (like obesity or heart disease) or inaccurately depict the effects aging has on physical capabilities. The correct choice reinforces the principle that pathology can lead to impairments that hinder an individual's physical functioning, aligning perfectly with the concepts outlined in Nagi's model.