VT usually is a consequence of structural heart disease, with breakdown of normal conduction patterns, increased automaticity (which tends to favor ectopic foci), and activation of re-entrant pathways in the ventricular conduction system. Electrolyte disturbances and sympathomimetics may increase the likelihood of VT in the susceptible heart.
VT can be triggered by electrolyte deficiencies (eg, hypokalemia, hypocalcemia, hypomagnesia).
Use of sympathomimetic agents (from relatively benign caffeine to more potent agents such as methamphetamine or cocaine) may stimulate VT in vulnerable hearts.
Ventricular tachycardia can occur in the absence of apparent heart disease. It can also develop as an early or a late complication of a heart attack, or during the course of cardiomyopathy, valvular heart disease, myocarditis.
Ventricular tachycardia may not cause symptoms in some people, but may be lethal in others -- it is a major cause of sudden cardiac death.
Here is my advice: Go to a Cardiologist (preferred) or to your physician and have a:
1. Cardiac Enzymes (blood test) done.
2. Get an Echo (ultrasound) of the heart to check for Cardiomyopathy (found in athletes). This could be causing your VT.
3. Get Holter Monitor Test done (you wear it for 24 hours). Wear it while do your normal activities such as weight lifting. This will produce what is going on electrically with your heart. You will need to keep a diary during this 24 hours with the times you did your activities, etc.
4. Also, get an Electrolytes test for (K+, Ca+, etc) to check for imbalances in your system which may also be causing VT.
As I mentioned above, VT can be deadly in some people (a smaller fraction), however, do you want to take the chance that smaller fraction be you? I would hope not. A good Cardiologist will be able to find why VT is happening and tell you what activities such as weight lifting is permissible. VT and Cardiomyopathy is why some athletes die on the field.
Now, I hope I did not scare you to death...just hope to scare you enough to find out what is going on. Good luck and keep me posted.
PS: KARMA is always welcome here!