Actin Myosin glue together????

[Guest guest]

> Scherger stated:

> We found that the tight torn hamstrings went hand and hand with the

> stiff bad back. The rational being with in poor global posture, the

> center of mass of trunk is moved to the anterior. When this occurs

> the hams now becomes chronically devoted to maintaining the upright

> posture then locomotion. The athlete becomes a postural maintaining

> machine instead of a locomotion machine. When the hams do this they

> go into a chronic fatigue and when this happens to a muscle the

> actin myosin fibers glue together and they lose their ability to

> lengthen.

>

> Casler writes:

>

> Glue together??? what are you talking about?

>

> Actin and myosin " don't " lengthen!!!

>

> Scherger replying to what Casler wrote above.

>

> To clarify from Guyton Textbook of Medical Physiology fourth

> edition; Page 90 Muscle Fatigue. Prolonged and strong contraction

> of a muscle leads to the well-known state of muscle fatigue. This

> results simply from inability of the contractile and metabolic

> processes of the muscle fibers to continue supplying the same work

> output. The nerve continues to function properly but the

> contraction of the muscle becomes weaker and weaker because of the

> depletion of energy supplies in the muscle fibers themselves. If a

> muscle becomes fatigued to an extreme extent, it is likely to become

> continually contracted and will remain contracted and rigid for many

> minutes even without an action potential as a stimulus. This is

> called a physiological contracture of the muscle. It is believed to

> result from a peculiar feature of the contractile process itself:

> Because ATP is required to make actin and myosin separate during the

> process of muscle relaxation. Otherwise the myosin and actin

> filaments will continue to be attracted to each other. In extreme

> muscle fatigue, then as the ATP has been depleted the actin and

> myosin filaments will become rigidly bound. End of paragraph.

Casler writes:

Hi ,

That is the description of a simple " muscle cramp " .

No where does it say that " the actin myosin fibers glue together " .

Also as I stated, actin and myosin don't lengthen, they resist lengthening.

And you suggest, " I " take your courses to someone in a college biomechanics

lab.

Regards,

Casler

TRI-VECTOR 3-D Force Systems

Century City, CA