Our expert says:
A heart rate of 144 while running on the treadmill is not excessive and is still significantly below your theoretical maximum heart rate for your age. If your heart is healthy, then a heart rate of 144 at age 50 is perfectly acceptable. You won’t damage a healthy heart by exercising at that heart rate. As a general rule it is only people with heart disease who may need to limit their exercise heart rates
Kind regards and best wishes, JT
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