Whenever my heart rate starts going higher during exercise, my


Q: 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.


A:   Hello,
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,

Comments / Follow Ups

Patient: I honestly only walked up a few smalls hills not that fast and it still starts shaking and I feel like something is going to happen. Even if I do the most minescule workout I amost feel fatigued
Doctor: Hello,
In that case you need to get your hemoglobin levels checked.
Also, your BP needs to be monitored for hypotension.
I will recommend a few days rest. Since heart problems has been ruled out, it does not seem to be anything major. You can still go ahead and get an 2D ECHO done to confirm.


Related Q&A

Q: Hey there. I'm a 55 year-old male and I was wondering if my Aortic Arch looks "normal" on this CT Scan? Ext...

Q: I was working out last week doing various squat exercises and ended up squeezing my vagina muscles way more than I sh...

Q: Hi the week before last i started a new job and manage to find a go go pill I took it last wednesday its a insurance...

Q: 83yr old male,6"185 lb,exercises reg,3times a wk for 11/2 hr.Currently treated for hi bld pres with low dose ado...

Q: Hi, I have regular annual check ups which are always normal. I am curious, however, since my father was a type 2 diab...


Dr. James Obaji M.D.

  • 247 Reviews
  • Family Physician

Dr. Suneel Sharman M.D.

  • 190 Reviews
  • Family Physician

Dr. Pat Golden M.D.

  • 169 Reviews
  • Cardiologist

Dr. Kunaal Jindal M.D.

  • 112 Reviews
  • Plastic Surgeon