Morning exercises
Despite all the advantages of morning physical activity. sometimes it is very difficult to force yourself to do the exercises. In this case you need an extra incentive. As an…

Continue reading →

The warm-up. KEEP MUSCLE TONE
Constant forced posture at the Desk can lead to fatigue one muscle group and inaction of another. Offer to give yourself 10-15 minutes to warm up. And thoughts will flow…

Continue reading →

Physical activity - School health goldfish
"Health need four conditions: physical activity, limited in the diet (poor appetite), hardening, and the ability to relax." so said M. M. Amosov in a recent interview. And further: "Nature…

Continue reading →

Physiology of muscular activity

Muscle activity is related to a basic property of muscle – ability to acronyms or airway. However, the muscles could be reduced if the muscle tisue have not had yet and physiological properties such as excitability and conductivity.

The property of contractility is manifested in the ability of the muscles to a single or total (tetanic) contractions. The body always happen tetanic, relatively long muscle contractions, because they receive not alone the momentum and flow of rhythmic impulses from the Central nervous system (CNS), and each of them calls the new contractile effect before the end of the reduction from the previous pulse. However, in experimental conditions it is posible to reproduce single reduction; the graphic image

of this reduction (of myogram) allows to allocate three phases: latent, or latent (thousandths of a second), the reduction phase and the relaxation phase (tenths or hundredths of a second).

Weak single reduction can take place only at a certain minimum strength irritation – Horny irritation, as well as diminishing only the most rapidly-excited fiber. The increase in the strength of excitation (up to a certain limit) leads to increased contractile effect because it reduced and les excitatory fibers.

Tetanic contraction is always stronger than a single, but each skeletal muscle has an optimal mode of irritation (from 100 to 200 pulses / sec) at which the reduction is strongest.

The muscles maintain a certain degree of tension, or tone, and when the reduction does not occur. Muscle tone is important to ensure a stable position of the body in space; only during sleep, both natural and drug, there is complete relaxation of the muscles, with the exception of the respiratory muscles, which continue to contract rhythmically (only for certain types of anesthesia are relaxing and breathing muscles). State of tonic muscle tension can be maintained by flow from the CNS single pulses that alternately stimulate different muscle fibers.

Physical activity - School health goldfish
"Health need four conditions: physical activity, limited in the diet (poor appetite), hardening, and the ability to relax." so said M. M. Amosov in a recent interview. And further: "Nature…

...

The body adapts to physical nagruzke
Fitnes centre Shaping is a system health and developmental exercise gymnastic in nature, including exercises, selectively acting on individual body parts and body functions. The program is designed for those…

...