Actin Myosin glue together????

[Guest guest]

I was using the glue as picture word to illustrate the actin and

> myosin filaments becoming rigidly bound.

Now the bigger idea. We have football player or runner that is

having hamstring " cramping " and also reduced stride length, power

and endurance. Or we simply have kid with tight hamstrings that is

affecting athletic ability. The kid is stretching all the time but

to no avail.

Kid is not " injured " so not sports rehab problem and therefore

wanders into to see strength and conditioning expert to improve the

function of his hamstring muscles. Kid naturally thinks strength

and conditioning expert because he wants " muscle " that will possess

power, endurance and natural flexibility. The kid does this because

wants more production.

As strengthening coach what strength and conditioning procedures

would you do you to train the kid to make him be natural talent

again or actually possess the proper physiologically functioning

hamstring? That is one that would exist in a normal " resting " length

that was ready to be stretched in locomotion to produce a even

greater contraction because a resting tension now develops.

I am interested in how you would train the muscle to produce better

physiological function. Is this not a major training problem in

sports?

When examining physiological functions of the hamstring it appeared

that locomotion and maintaining posture were it. I am all for

exercising the hamstring to make it " stronger " but the problem

appears to be that unlike biceps it is not existing in a non working

normal resting stretched length.

If existing in normal stretched length and then when in locomotion

it was stretched to greater than normal length prior to contraction

a large amount of resting tension would be properly developing into

the muscle before the contraction actual contraction takes place.

But this appears to not be happening why? The rational appeared to

be the role the hamstring was playing maintaining the poor posture.

In the poor posture or loss of the lumbar lordosis the center of

mass of the upper trunk is moved more anterior to the hips.

The weight of the trunk was not increasing but its effective weight

or what is known as resistance arm was increasing relative to the

effective effort arm of the hamstrings.

As the poor posture or loss of lordosis moved the center of mass

forward the hamstring in the " closed system " are required by as

observed biomechanical engineering the muscle as leverage system to

work harder and harder and begin to exist in worse and worse

chronic " non resting " stretched length.

This rational lead us to realize that we had to produce strengthen

procedures that would reduce the demand the on the hamstrings so

they could function for locomotion like a muscles that was existing

in a normal resting length.

When I hear some one has tight hamstrings I naturally think sit up

exercise as strengthening exercise to induce proper posture to align

center of mass of trunk over hips and thereby reducing the chronic

fatigue work on the hamstring.

Scherger, Ridgefield wa

>

> > 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

>

[Guest guest]

Scherger wrote:

I was using the glue as picture word to illustrate the actin and

> myosin filaments becoming rigidly bound.

Casler writes:

, you claim to have knowledge of Physiological and Biomechanical

processes, yet use this type of language?

No one I have ever worked with would describe a muscle cramp by stating the

actin and myosin were " glued " .

Scherger wrote:

When examining physiological functions of the hamstring it appeared

that locomotion and maintaining posture were it. I am all for

exercising the hamstring to make it " stronger " but the problem

appears to be that unlike biceps it is not existing in a non working

normal resting stretched length.

If existing in normal stretched length and then when in locomotion

it was stretched to greater than normal length prior to contraction

a large amount of resting tension would be properly developing into

the muscle before the contraction actual contraction takes place.

But this appears to not be happening why? The rational appeared to

be the role the hamstring was playing maintaining the poor posture.

In the poor posture or loss of the lumbar lordosis the center of

mass of the upper trunk is moved more anterior to the hips.

The weight of the trunk was not increasing but its effective weight

or what is known as resistance arm was increasing relative to the

effective effort arm of the hamstrings.

As the poor posture or loss of lordosis moved the center of mass

forward the hamstring in the " closed system " are required by as

observed biomechanical engineering the muscle as leverage system to

work harder and harder and begin to exist in worse and worse

chronic " non resting " stretched length.

Casler writes:

If the hips are rotated in such a way as to " flatten " the Lumbar curve the

hamstrings " shorten " , not lengthen. Adding lumbar curve " stretches " the

hamstrings.

Scherger wrote:

This rational lead us to realize that we had to produce strengthen

procedures that would reduce the demand the on the hamstrings so

they could function for locomotion like a muscles that was existing

in a normal resting length.

Casler writes:

It seems your whole premise is skewed, or am I missing something?

Scherger wrote:

When I hear some one has tight hamstrings I naturally think sit up

exercise as strengthening exercise to induce proper posture to align

center of mass of trunk over hips and thereby reducing the chronic

fatigue work on the hamstring.

Casler writes:

Since this seems to be the " foundation " of your program, can you please

explain " HOW " a sit-up can, " induce proper posture to align center of mass

of trunk over hips and thereby reducing the chronic fatigue work on the

hamstring " ?

Regards,

Casler

TRI-VECTOR 3-D Force Systems

Century City, CA