Index Length

In cardiac physiology, the length-tension index characterizes the contractility of the myocardium (heart muscle), that is, how much the heart muscle can contract per unit of time.

Index "length.

For the article, use the description below: the “length - tension” index is an indicator of myocardial contractility, which is the ratio of the length of myocardial fibers to the degree of their tension; as contractility decreases, it decreases

The “length” index is an indicator of the contractility of the heart muscles, which is determined through the ratio of the number of muscle fibers to their tension. Not all fibers are active at the same time, so the contraction can be compared to a long scarf. If the tension of the scarf is higher than its length, then the overall contraction effect will be maximum. On the contrary, if the scarf is short or tense, but weak (tens only over one or two adjacent micronivils), this does not provide maximum movement. This simple example explains how the work of the heart muscles depends on tension.

There is also one more point that is important to mention: when the heart muscle contracts, it is not just compressed, but the movement is carried out in the desired direction through the heart valves. For this reason, the muscle must have sufficient length or strength to rest on a particular heart valve and open it, otherwise it will not be effective.