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Yes I did mean loaded hyperextensions using the standard hyper bench
seen in most gyms and holding a dumbell to my chest. From what you
stated you think I should be using the valsalver maneuver to raise
IAP during this movement even with the spine flexed (and its not to
a great degree).
Ian Pateyjohns B.App.Sc (Hons)
Adelaide Australia
--- In Supertraining@
<bioforce.inc@
>
> Ian Pateyjohns wrote:
>
> Most information I come across strongly advocates against any form
of
> spinal flexion when performing lift such as squats, deadlifts etc.
But
> when doing back extensions many people use a full ROM of flexion
into
> extension (I normally do). But what about when you start to load
this
> exercise, I currently use 40kgs but I can see this increasing. I
would
> like to get some opinions on whether a gradual progresive increase
in
> this exercise is putting myself or anybody else doing similar at
high
> risk of a spinal injury?
>
> I also came across this site
> http://www.exrx.
> which seems to promote some flexion in certain lifts see the
section on
> cable rows and stiff legged deadlifts
>
> John Casler writes:
>
> Hi Ian,
>
> Axial loading of the spine (or similar conditions) that cause
significant
> loads to be seen at the anterior disc body, while decreasing the
compression
> of the posterior disc body can be a problem.
>
> That said, each and every loading need be looked at as to its
complete
> myriad of forces, and how they are managed during the dynamic load
phases.
>
> For example, your stiff legged deadlift may have less danger than
one might
> expect from a simple stick drawing only looking at the "main"
force vectors
> to the spine.
>
> Elements of the Torso Stabilization Mechanism, such as the load
transmitted
> via arms > lats > lumbar spine, can stabilize the lumbar spine and
reduce
> the danger. (This will not happen to the same degree during a Good
Morning
> for obvious reasons)
>
> So between the actions of the spinal extensors, which are
compressive, and
> the lats, in conjunction with the gluteals, you are creating a
compressive
> and stabilizing force relationship to the posterior disc body. If
this is
> coupled with anti-compression activity of the Anterior Torso
muscles, and
> IAP, you have significant support for reasonable loads, as long as
the
> "stabilization processes" remain active, and one does not go
to "too great"
> ROM's.
>
> That said, I cannot encourage one to perform Stiff Legged DL's
without
> significant understanding of what I just wrote.
>
> But the key is analyzing and evaluating each portion of the ROM,
and how
> each of the forces of the TSM (Torso Stabilization Mechanism) acts
to manage
> the force load to the spinal discs.
>
> When you post of "Back Extensions", are you asking about a
specific
> exercise, like loaded hyperextensions?
>
> Regards,
>
> John Casler
> TRI-VECTOR 3-D Force Systems
> Century City, CA
>
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