The side that speaks...

[emad]

Bernard:

usually the rear part suffer pain :!:

cheers
emad

[Diane]

Oh Bernard, I am so glad that someone else besides me contemplates mysteries like this. I actually wrote a huge thread on this on a private forum, and will go find some of my thoughts to bring forward here. Perhaps here, we all can ponder a bit more on this.
Diane

[BB]

I actually came across an interesting reference today that may fit into this question. (I came across it while cleaning out my car....what a coincidence!)

JOSPT feb 02 "Skeletal muscle adaptation with age..."(sorry for the incomplete reference, these are from my notes from a lit review I did last year. If anyone is interested, I'll get the full reference and maybe post the abstract next week)

Regarding muscle changes with inactivity...

-Postural muscles affected more rapidly than dynamic movers
-extensors affected more than flexors
-slow twitch fibers converted to fast twitch fibers

It would seem to me that the posterior of the body would contain the majority of the "postural muscles" and extensors, while the front of the body would have the majority of the dynamic movers (an exception would probably be hamstrings/quadriceps.

This would fit in nicely with your idea of a difference front to back Bernard and Diane!

Cory

[BB]

I found a link to the abstract. It is actually a clinical commentary.
The article is titled "Skeletal Muscle Adaptations with Age, Inactivity, and Therapeutic Exercise"
It should let you display the abstract, but won't let you look at the full text unless you are a member.

http://www.jospt.org/archive/ao.cfm?month=February&year=2002#

Cory

[Diane]

Cory, this looks very interesting. Like one action module after another closing down. It would be great to see more of that article. Perhaps you could actually type out the relevant bits from which you made the notes? (Quote marks properly around them of course, to protect their copyright..)
8-)
Diane

[nari]

BB

A good find! (serendipity). Also the comment by Warren and Ingalls on the mechanisms that contribute to strength loss...after injury.

The journals sound interesting - will google for them.

Nari

[BB]

Excerpts from "Skeletal muscle adaptation to age, inactivity, and therapuetic exercise" Feb 02, JOSPT

These are from a portion of the clinical commentary discussing changes from inactivity

"For example, inactivity induces substantial atrophy in muscles that play an antigravity, postural role. The anti-gravity, predominantly slow twitch type 1 muscles, such as the soleus, atrophy more than primarily type 2 fast twitch muscles and extensor muscles are affected more than flexors. This atrophic response occurs rapidly, with reduction in soleus mass of up to 37% after 4 to 7 days of inactivity. Similarly, at the single fiber level, the type 1 fibers show greater inactivity induced atrophy than the type 2 fibers, and fibers from extensor muscles are more affected than those from flexors."

Regarding fiber type transformation:

"Inactivity appears to induce a fiber type transformation within specific muscles. Within a short period of inactivity, the number of type 1 fibers in the antigravity muscles decreases, whereas the number of fibers containing fast type myosin increases."

Cory

[Diane]

Hi Cory,
Thanks for supplying more info!
I applied your previous post to a thread elsewhere, perhaps you'd like to check it out:
http://www.rehabedge.com/forums/Forum15/HTML/000091.html
Diane

[BB]

Diane,

thanks for the link to the thread....another very interesting discussion. This has prompted another question from me which I will post as a new thread.

On the front to back discussion:

One thing that has always been very interesting to me is the similarities and differences between upper and lower body. It seems as though the lower body has corresponding counterparts in the upper body only facing the opposite direction. Example, sternum front facing, corresponding part-sacrum faces back. I'm sure that there is an embryologic explanation for this, but I just think that it is interesting.

Cory

[bernard]

Diane,

An excellent topic on rehabedge which promotes the idea of involvement of muscles patterns in pain problems?