Final answer:
The cause to NOT immediately stop a cardiorespiratory exercise test from the provided options is heavy breathing due to intense exercise. Other symptoms like severe fatigue, nausea, lightheadedness, and leg cramping are legitimate reasons to stop the test.
Step-by-step explanation:
The question refers to when to immediately stop a cardiorespiratory exercise test. Among the options provided, the one that is NOT a cause to immediately stop an exercise test is Heavy breathing due to intense exercise (A). While heavy breathing can occur due to the increased demands for oxygen by working muscles, it is a natural response and not necessarily a sign to cease exercise testing unless accompanied by more serious symptoms.
Options B (Complaints of severe fatigue), C (Nausea and lightheadedness), and D (Leg cramping) are all valid reasons to stop an exercise test immediately. These symptoms could indicate serious underlying conditions, such as cardiovascular or metabolic issues, that may pose significant risk to the individual's health if exercise were to continue.