When my plan calls for a zone one run and my heart rate drifts above after 45 min despite same pace should i slow to stay in zone 1 or hold the steady pace
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If you are following a plan that says to keep you HR in zone one you may give a couple beats either way but zone 1 is zone 1.
If you are questioning whether the plan is valid that is a different question. Look to the reasons of what your zone 1 is suppose to do and then do what you need to achieve those results. There are many reasons why you plan may call for zone 1, I really think you should trust it for at least 12 weeks.
jaretj
The use of HR in “zones” is to control aerobic exercise intensity or power. The goal is not to actually train HR, but rather the oxygen transport and utilization process. Oxygen consumption does not increase when HR drifts upward if pace or power is maintained. So, your aerobic intensity remains in the intended zone despite the drift in HR. The reason for HR (cardiovascular) drift during prolonged exercise has a lot to do with blood pressure regulation.
When my plan calls for a zone one run and my heart rate drifts above after 45 min despite same pace should i slow to stay in zone 1 or hold the steady pace