Muscle pain are appearing very often after an intensive training. Most common places where this problem manifests are shoulders, neck and upper back. Pain in these parts of body are often causing difficulties to move other muscles freely, which further causes an end of Your exercise. These sorts of pain can last even months long and it is usually the result of muscle knots.

Muscle knots are spots inside the muscles, where it’s impossible to release the contracting fibres and that is why they remain tense. They can be described as irritable, isolated and delicate points in muscle tissue.

Medical term for muscle knots is myofascial trigger points (MTPS). They can reach the size of a pinhead or even the size of a thumb.

Muscle knots can cause two kinds of pain. The first one is the pain that a person feels only as a latent trigger point, when there is a pressure put on it. The second one is through the active trigger Point; they are the knots which are producing active pain along the nerve tracts and sending it towards the other parts of body.

Why do muscle knots appear?
Muscle knots can occur due to the injury (physical stress), toxic exposition (chemical stress), nutritional deficiency or even emotional stress. All of these causes can lead towards the  contracted tighten ligaments of muscle tissue. They can sometimes be painless and untouchable trough the skin, but they will eventually start to shorten and change your pattern of moving.

The muscles in Your body contains several hundreds of muscle fibres. They are working in a manner of actin and myosin fibres shortening themselves, which causes the contraction of the muscle. When You press Your muscles together, they send the most of the blood out of the muscle. While Your body is trying to balance this with high blood pressure and heart rate, the initial deficit of blood in muscle fibres is leading towards the reduction of oxygen and nutrients that blood provides. Thigh muscles strings are starting to run on low energy or ATP (Adenosine triphosphate). When muscle cells reach the lack of ATP, the manifestation of tiredness and pain appear. If muscles are in constant contraction and the blood flow to the certain part of muscles stops, they start producing the surplus of metabolic waste and thus send the signals of pain to the brain.