1, different muscle states:? People often refer to inflexible and uncoordinated muscles as dead muscles. In order to avoid the occurrence of dead muscles, we need to do some stretching exercises after exercise to adjust the state of muscle tension, so that the muscles we exercise are living muscles, which can be more coordinated with the body, so the living muscles are more relaxed than the dead muscles.

2. Muscle agility is different: after a period of exercise training, the decline of explosive power and agility is true. The fundamental reason for the decline of muscle explosive force is not the slow contraction speed of a certain muscle, but the decline of coordination ability between muscles. The external manifestation of this phenomenon is the decline of explosive power and agility. The agility of dead muscles will decrease.

3. The instantaneous explosive power of muscles is different: people with good muscles are quite explosive, with good speed and flexibility. Dead muscles are the opposite. This is the reason for the so-called muscle life-and-death battle.

Skeletal muscle is a kind of visible and tangible muscle. When bodybuilders increase muscle strength through exercise, they exercise skeletal muscle. Skeletal muscles are attached to bones and appear in pairs: one muscle moves bones in one direction and the other moves bones in the opposite direction. These muscles usually contract at will, which means that when they want to contract muscles, the nervous system will instruct them to do so.

Red and white muscle fibers Human skeletal muscle can be divided into red muscle and white muscle. Red muscle fibers rely on hemoglobin for continuous oxygen supply and long-term contraction and stretching, so that we can carry out daily behavior activities. White muscle fibers expand and contract rapidly through internal rapid chemical reaction (mostly in emergency), which is characterized by long duration and short reaction time, and its reaction time is one quarter of that of red muscle fibers.

Smooth muscle exists in digestive system, blood vessels, bladder, respiratory tract and female uterus. Smooth muscle can stretch and maintain tension for a long time. These muscles don't contract at will, which means that the nervous system will automatically control them without thinking. For example, the muscles of the stomach and intestines perform tasks every day, but people generally don't notice them.

Myocardium exists only in the heart, and its biggest feature is endurance and firmness. It can stretch as limited as smooth muscle or contract as powerfully as skeletal muscle. It's just a twitching muscle that doesn't automatically contract. The heart muscle has a fixed contraction law, thus producing a heartbeat. Normal pacemaker cells are normal, and the regularity of myocardial contraction is certain. If pacemaker cells are abnormal, the regularity of myocardial contraction will change.