What causes arm muscle soreness?

Muscle soreness must be due to the effect. If there is no pain, you will feel that you have not practiced well. So, today we will talk about the causes of muscle soreness:

Lactic acid accumulation

Delayed onset muscle soreness and lactic acid accumulation

The view is that muscle cells do not function properly during training. During oxygen respiration and glycolysis, lactic acid accumulates, causing soreness. ?

But within one or two hours after exercise, lactic acid will be basically eliminated, so the soreness that occurs during training and within a short period of time after training is related to the accumulation of lactic acid. So this is not the cause of post-workout soreness. Delayed onset muscle soreness

The view is that muscle fiber damage during training stimulates pain nerves, and mild inflammation caused by muscle fiber damage.

This is the reason why my muscles are sore the day after training. The principle of muscle building is to first tear muscle fibers through weight-bearing training, then supplement enough protein to allow muscle repair and synthesis, and over-recovery to achieve the purpose of muscle enlargement. Mild delayed onset muscle soreness can recover within 24-48 hours, while severe cases may take more than 72 hours to recover. This is the real cause of post-workout soreness.