On 10/4/00, Emilie McGrath<[log in to unmask]> writes:
<< I should have been a bit more precise. I'm aware (anecdotally) that many
colleagues feel that one of the reasons that athletes get recurring
hamstring strains is because they somehow have problems with dymanic
stabilisation of the pelvis and trunk. I haven't been able to find a body of
evidence in the literature to really support this. This is partly why I'm
embarking on my project - I want to see if a programme of pelvic and trunk
stabilisation exercises imrpove the performance of the hamstring muscle,
tested isokinetically. Know of any articles or books? >>
*** What about the possibility that hamstring injuries may have nothing to do
with trunk or pelvis stabilisation but to spurious activity of one or more of
the hamstring muscles at a time when their contribution should be minimised?
If one ever wishes to correlate injuries with changes in stabilisation or
postural state, then it is essential that other possible causes of injury,
such as spurious muscle activity or inefficient motor skill, be ruled out of
contention.
If we wish to ascertain if a programme of pelvic and trunk stabilisation
exercises improves the performance of the hamstring muscle, tested
isokinetically, then we have to be cautious not to extrapolate highly
constrained measurements of joint torque to imply that hamstring performance
in complex multiarticular "functional" activities will be safer and more
efficient if we improve trunk and pelvic stability with isolation exercises.
Many research projects into the specificity of motor action query that sort
of unsubstantiated extrapolation.
Dr Mel C Siff
Denver, USA
http://www.egroups.com/group/supertraining
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