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Re: What muscle controls push-off?
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Re: What muscle controls push-off? - November 16, 2002 3:50:00 PM
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Andrew M. Ball PT PhD
Posts: 855
Joined: July 28, 2002
From: Charlotte, NC
Status: offline
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Doug,
Thanks. The course is going to taught entirely online through one of the 5 or so DScPT programs in the country. That means the students will be a mix of fantastic clinical artists with years of expertise, and a few DPT's. I'm excited, but I'm nervous too. Writing tests and quizzes is just about my least favorite thing in the world to do - - - besides laundry. Which reminds me . . . It also means that I’m going to have to stop asking philosophical questions like this that get some people thinking and self-examining --- and other’s just frustrated and upset. In short, I’m going to have to restrain myself from sparking debate and start acting more like an academician --- otherwise my adjunct professorship won’t last long.
Basically, what that means is that someone else is going to have to step up and take over that role. I’d like to pass the torch to you Doug. What do you say?
As for this discussion, I’ll see it through:
I'm suggesting that the eccentric contraction of the gastroc serves to control tibial advancement from heel-strike to mid stance.
I'm also not sure I'd agree that the gastroc's contractile role from mid-stance to push-off ifor the purposes of propulsion is a forgone conclusion. An interesting theory that’s been presented to me of late is that as the gastrocs are "chock full" of muscle spindles and GTO's, which work better when the muscle is contracting and under stretch respectively, it is possible that the primary role of the gastrocs during that phase of gait isn't so much active propulsion as it is sensory. Fascinating proposal, I just don’t know enough about that kind of research to answer the question . . . but I hope that one of the human movement science Ph.D. candidate lurkers take it on!
Drew
[This message has been edited by Andrew M. Ball PT PhD (edited November 16, 2002).]
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Re: What muscle controls push-off? - November 16, 2002 3:59:00 PM
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M.C.Clark
Posts: 4
Joined: November 2, 2002
From: Bathurst, NB, Canada
Status: offline
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As a physio who has just had her walking speed increased by close to 20% in the past 10 days, with much improved push-off, I would like to say that the difference was made by practicing the ideomotor movement taught in a seminar by Barrett Dorko Nov 2-3, 2002. For 2 decades prior to the seminar, my best walking speed was 2.4 mph over 1 mile. I now walk the mile in 21 min. Almost 3mph. Improvement in flexibility at the hips and a new-found ability to rock forward onto the heads of the metatarsals are the 2 main changes. Since most of my patients have "athritis" of one form or another, this is the type of results I am interested in.
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Re: What muscle controls push-off? - November 16, 2002 7:13:00 PM
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Bournephysio
Posts: 585
Joined: April 25, 2002
From: Calgary
Status: offline
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Don't know if I have time to carry any torches. Lately I've been posting more than I should be with the time I have. Next term my research will be in full swing and I am taking an engineering biomech course.
The research I quoted shows that the plantar flexors do provide power for propulsion sometime between when eccentric dorsiflexion ends and toe off occurs. How much is stored energy, how significant the propulsion is, and so on I don't know and wouldn't know until I looked closely at the articles (which I don't have time for)
To me the motor control questions that you alluded to are more interesting and may be more important. For example (as I understand it) theories on central pattern generators leading to partial weight bearing gait training.
Doug
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Re: What muscle controls push-off? - November 19, 2002 2:15:00 AM
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Barrett
Posts: 967
Joined: July 28, 1999
From: Cuyahoga Falls, Ohio
Status: offline
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To M.C. Clark,
I appreciate your mentioning the workshop and your response to the care I suggested. I see you don't provide an email address in your profile so I can only respond here.
If I'm correct in guessing who you are, there were several other problems you had to deal with. I'm wondering if these are improved as well. Ultimately, is the knowledge of which specific muscle pushes off relevant to your recovery?
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