The following website features an interesting article on Stretching Myths and
Facts that is being quoted quite widely at the moment:
http://www.physsportsmed.com/cover.htm >>
I recently wrote a few comments on this very thorough review for our
supertraining discussion group that may also be of interest here
(http://www.egroups.com/group/supertraining ).
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Several of us have been questioning the necessity for the use of dedicated
"stretching" and "warming up" sessions for many years, so it is good to
see a review of this stature examining these issues in depth (see Siff MC
"Facts and Fallacies of Fitness" 2000). I also like to point out that
stretching exercise (which are meant to deform tissues) are not necessarily
the same as flexibility exercises (which are meant to increase range of
movement).
There are several interesting issues in Shrier's article on stretching facts
and myths (The Physician & Sports Medicine -Vol 28, No. 8 - Aug 2000), such
as this one:
< With respect to alleviating the pain associated with stiffness, the weight
of the evidence suggests that the decrease in stiffness is not as important
as the increase in "stretch tolerance". Briefly, an increase in stretch
tolerance means that patients feel less pain for the same force applied to
the muscle. The result is increased range of motion, even though true
stiffness does not change. This could occur through increased tissue strength
or analgesia; however, increased stretch tolerance that occurs immediately
after stretching must be caused by an analgesic effect because tissue
strength does not increase during 2 minutes of stretching. Unfortunately,
evidence of a possible analgesic effect is recent, and the underlying
mechanism is unknown. After weeks of stretching, increases in stretch
tolerance could theoretically occur because stretch-induced hypertrophy may
increase tissue strength , and/or an analgesia effect may be present. >
***The use of the term "analgesic" may not be entirely appropriate. While
there may be an as yet identified analgesic effect associated with intense
stretching, this may be greatly overshadowed by an accommodation effect which
changes the Rating of Perceived Effort (or pain) with regular imposition of
progressively increased stretching loads. This happens with all lifting -
the load progressively feels lighter and the lifter then can execute more
reps or a heavier 1 rep max.
This is not necessarily the same as the so-called disinhibition effect which
is an objective altering of nervous processes in the body - it is an effect
that is more subjectively psychological in origin (even though it also
obviously involves neural processes).
Despite the very useful and interesting nature of this review, the reference
list was disappointingly small and it made no use of some really relevant
work by Russian scientists such as Iashvili (e.g. see Ch 3 of Siff &
Verkhoshansky "Supertraining" 1999).
At least, the high profile given to this article will tend to make fitness
pros, therapists and sports coaches start wondering a lot more about all
those traditional stretching and warming up ideas.
Dr Mel C Siff
Denver, USA
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