Whenever my heart rate starts going higher during exercise, my
Patient :Whenever my heart rate starts going higher during exercise, my legs start feeling weak and I start getting shaky. I have a history of anxiety, no blood sugar problems, no heart problems as I have been checked out lately. What causes this tremor like legs and eagerness to sit down.
Thank you for your medical query at AskTheDoctor.com
I understand your concern.
The fact that your legs are shaky and you feel weak is indicative of low blood sugar levels post exercise or just extreme fatigue. This can happen due to lack of water, or loss of excessive amounts of salt. The heart rate going up is normal phenomena and is unrelated to your symptoms.
I will strongly recommend you drink some energy drink like Gatorade or some other glucose drink before you start working out. And see if the symptoms persist. Even though you do not have sugar problems, sugar may go very low post exercise. An energy drink will prevent that. I also want you to repeat your hemoglobin and let me know.
Hope this was helpful,
Please feel free to discuss further,
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