What causes fluctuations in pulse rate while exercising in an elderly woman?
I would explain as follows:
Welcome on HCM!
I carefully passed through your question and would explain that your symptoms don't seem to be related to any cardiac disorder. They are just physiological changes during physical activity.
You should know that during physical activity a big amount of adrenaline is produced and released into the blood through the activation of sympathetic nervous system. At the same time our body begins to metabolize it. The balance, and the amount of adrenaline acting to the heart muscles, determines its rate of beating.
But these fluctuations happen in every normal person.
This happens during emotional stress and anxiety too.
Nevertheless, as you refer to have palpitations time after time, I would recommend performing a routine check up including:
- a resting ECG
- a cardiac ultrasound
- some blood lab tests (complete blood count, thyroid hormone levels, blood electrolytes).
An ambulatory 24-48 hours ECG monitoring would examine better your heart rhythm trends during the day and exclude possible cardiac arrhythmia.
Hope you will find this answer helpful!
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