Final answer:
The selected exercise testing protocol for a symptom-limited maximal exercise test should vary based on individual fitness levels to achieve the goal of maximal exertion without harm or discomfort.
Step-by-step explanation:
The selected exercise testing protocol for a symptom-limited maximal exercise test should result in a total exercise duration that varies based on individual fitness levels. This means that there is no specific time range that applies to everyone. The duration will depend on factors such as the person's fitness level, age, and overall health. For some individuals, it may be 5 to 10 minutes, while for others, it could be 15 to 20 minutes or even 30 to 40 minutes. The goal is to reach a point of maximal exertion without causing any harm or discomfort.