Can you tell me what it indicates if a person could not get their heart rate up to the desirable number during an echo stress test during the treadmill portion. It is a male age 36 with insulin dependent diabetes since age 6. He has a tendency to have slow heart rate and could not exceed the mid 150's during the treadmill no matter how they kept making him work harder. He is 5'7" and weighs about 155 and is very active. He never has any pain during exertion, but has been experiencing some discomfort during rest.