1. The reason for the increase of protein content in muscle.
The main reason of muscle enlargement is the increase of muscle protein, including the increase of total contractile protein; In addition, the number and strength of connective tissue, tendon and ligament tissue around muscle fibers have also increased.
2. Brief introduction of contractile protein
Mainly composed of myosin and actin. Myofibrils of myocardial cells are connected by several sarcomere, which is the basic unit of myocardial contraction and contraction, and is mainly composed of thick and thin myofilaments. The main component of thick myofilament (equivalent to the dark area of sarcomere) is myosin, with a molecular weight of about 500 thousand.
The total length is about 150nm, with a free transverse bridge at one end and a spherical swelling at the top. It has ATPase activity and can decompose ATP for the medical education network needed for myofilament sliding. Filament (corresponding to the zona pellucida of sarcomere) is mainly composed of actin with molecular weight of 47000, which is spherical, and slender fibers are connected in series to form a double helix.
There is a special "action point" on actin, which can form a reversible combination with the transverse bridge of globulin. Actin and myosin are the material basis of myocardial relaxation and contraction. Under the action of pathological factors, its function can be blocked and its structure can be destroyed.
Briefly describe the training load and muscle mass;
Brief introduction of training load:
Mainly refers to the accumulation and superposition of training intensity in training time. The greater the intensity, the longer the time and the greater the training load. Therefore, the extension of training load is greater than training intensity. If the training intensity is high, but the training time is short, then the training load will not be too great, such as a single sprint.
Introduction to muscle volume:
Generally speaking, it means that a person's muscles look well developed. As we know, every muscle is made up of tiny muscle fibers. If each muscle fiber becomes thicker or the number of muscle fibers increases, it will lead to muscle enlargement. But in fact, through strength training, we can only thicken muscle fibers, but not increase the number of muscle fibers.