My heart rate at the gym today reached a very high bpm about 4 to 5beats per second after i attempted to lift my heaviest and i felt pain in heart?

Need advice.: This is apparently too much exercise or lifting too heavy amount of weight. See your doctor for clearance and then get a trainer to help with the decision of how much and how fast to lift. You may be exceeding what you can do.Do it sensibly.

How was it: calculated? I am not sure what your total heart rate was? ( in beats per minute ). How does someone measure beats/second? Normal heart rate is 60-100 bpm. After vigorous exercise-150-180 with extreme exertion.