최적의 근육길이일 때, 최대 힘이 발생한다 muscle length tension relationship

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근육의 길이와 긴장관계에 대한 공부

너무도 오랫동안 궁금해왔던 내용이다. 이제 term을 찾았다.

Skeletal Muscle is a Biological Example of a Linear Electro.pdf

Length - Tension Relation

Comparison of the Length-Tension Relation in Skeletal and Cardiac Muscle

Representative resting, total, and active forces as a function of length are plotted for a 
skeletal muscle and a heart muscle preparation:

Fig. from Jewell, in "The Physiological Basis of Starling's Law of the Heart" CIBA Fdn 
Symp. 24, 1974, as modified by Katz, in "Physiology of the Heart," Raven Press, 1992.

Active force

In both tissues, developed force rises to a peak at an "optimal length" and then falls off 
at very long lengths. In both cases, the declining part of the developed force curve is 
due to diminishing overlap between actin and myosin, resulting in formation of fewer 
crossbridges at long lengths.

At lengths less than optimal, the force declines for a number of reasons, including 
myosin collision with the z line. In addition, calcium release from the SR declines at 
short lengths.

Resting force

In contrast to skeletal muscle, resting force is higher in cardiac muscle and is 
significant at lengths less than optimal. Because of the relation between resting and 
active force, the ventricles function on the rising limb of the length-tension relation 
(whereas skeletal muscle normally operates near the optimal length). This ensures 
that the intact heart can respond to an increase of filling by improving contraction.

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Active force 와 resting force를 구분해서 꼭 알아야 하나?

[전지원]

두번째 그래프에 대해서 궁굼합니다
오십견이나 어떤관절의 굳음에 의한 관절가동술을 할때 텐션과 장력이 생기는데 끝범위에서 계속 자극을 주다 돌아올때 통증이 느껴지는건 total tension이 내려갓다 올라가는 모습이라 돌아오는 중간에 최대 장력이 발생하니깐 그런건가요????

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아닌듯... 일단 통증으로 인한 tension과 근력, 근지구력을 위한 tension은 전혀 다름...