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Using 85% of the predicted maximum heart rate during an exercise stress test is primarily aimed at establishing the endpoint of a submaximal exercise test. This benchmark allows healthcare professionals to assess the cardiovascular response to exercise without pushing the patient to their absolute maximum capacity, which can be more dangerous and less informative.

By setting the endpoint at 85% of the predicted maximum, the test can effectively evaluate how the heart responds to increased workload and identify any possible abnormalities in heart rhythm or function that might not be evident at rest. This approach ensures that the test is both safe and clinically relevant, providing valuable information about the patient's fitness level and potential cardiovascular risks.

The other options focus more on aspects that do not directly relate to the set endpoint of submaximal testing. For instance, determining the time to increase speed relates more to the test's progression, while indicating when continuous ECG recording begins doesn’t necessarily correlate to the heart rate target being employed. Lastly, identifying normal heart rate responses could be part of the overall assessment but is not the primary purpose of setting the 85% threshold.