Symptoms of muscle strain, there are these signs

Muscle strain is damage to muscles during strenuous exercise. It is most likely to occur during exercises such as sit-ups and pull-ups. After a muscle strain, the injured area will be very painful, and symptoms such as swelling and hardening will also appear.

1. Symptoms

Local pain, tenderness; swelling, muscle tension, stiffness, spasm; functional impairment. The pain worsens when the injured muscle is actively contracted or passively stretched; a positive muscle contraction resistance test means that the pain worsens or a rupture depression appears. Some wounded people have a tearing sensation, obvious swelling and severe subcutaneous congestion, and there is a depression when touching the local area or an abnormal bulge at one end, which may be a muscle rupture. 

2. Cause and Principle

In sports, due to improper warm-up exercises, the physiological function of a certain muscle has not yet reached the state required to adapt to the exercise; the training level is not enough, and the muscle elasticity and strength are poor; fatigue or excessive load causes the muscle function to decline, the strength to weaken, and the coordination to decrease; incorrect technical movements or lack of concentration during exercise, excessive or rough movements; low temperature and high humidity, poor quality of venues or equipment, etc. can all cause muscle strain.

When completing various movements, muscles actively and violently contract, exceeding their own bearing capacity; or they are suddenly and passively over-stretched, exceeding their elasticity, which can cause strain. For example, when bending over to grab the barbell during weightlifting, the erector spinae muscles may be strained due to strong contraction; when doing exercises such as front leg stretches and vertical splits, suddenly exerting too much force may cause excessive passive stretching of the posterior thigh muscles and cause injury; horizontal splits exercises may cause excessive passive stretching of the inner thigh muscles and cause strain. In sports, strain of the posterior thigh muscles is the most common. The adductor muscles of the thigh, lumbar and back muscles, rectus abdominis, calf triceps, upper arm muscles, etc. are all prone to muscle strain. 