Muscle soreness means training is effective? Pull it!
There is an article on the Breakingmuscle website that explores some literature reviews of delayed onset muscle soreness. Let's take a look.
How does delayed soreness occur?
There is currently no definitive answer to the cause of delayed onset muscle soreness.
In the previous concept, DOMS was caused by lactic acid accumulation and toxic metabolites, but this theory has been overthrown!
Schoenfeld and Contreras proposed a mechanism that is not yet well defined, which is caused by inflammatory products that affect the sensitive nociceptors of connective tissue in microscopic muscle damage, causing a feeling of pain. His article provides an in-depth description of toxic metabolic biochemical products and different neural conduction pathways. But if your goal is simply to find out the relationship between DOMS and your growing strength after exercise, we don't need to discuss this. 
To summarize, delayed onset muscle soreness appears to be caused by minimally invasive connective tissue. In addition, most exercise can induce some delayed onset muscle soreness, but during eccentric exercise (muscle elongation or stretching) for delayed muscles The effect of soreness is particularly remarkable.
Does delayed muscle soreness mean more muscle buildup?
The simple answer is: No , although he will increase muscle to a certain extent.
Schoenfeld's literature mentions that the three key mechanisms of muscle hypertrophy are:
1. Mechanical tension
 2. Metabolic stress
3. Muscle damage
Our discussion of delayed onset muscle soreness is of greatest interest to the third "muscle injury" because of the strong correlation between delayed onset muscle soreness and muscle damage caused by exercise.
Simple explanation:
Muscle damage is a factor that promotes muscle hypertrophy, but it is not a necessary condition.
Mechanical tension,
Metabolic stress without Muscle damage.
And excessive muscle soreness can also be counterproductive. Severe pain reduces the production of strength and is detrimental to the next training.
You may think that the more painful your muscles after training can represent the standard of muscle damage.
But Schoenfeld and Contreras said that although delayed onset muscle soreness can provide some degree of damage to muscle tissue, it cannot be used as a clear criterion for muscle damage.
So you don't need to rely on the muscle soreness of your body after a training session as an accurate indicator of muscle mass.
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