Vern used the analogy of a caterpillar. How does it know which leg to move and when? It has a very primitive nervous system, with no brain to speak of to organize these movements. In my ankle book due out this fall, I mention the fact that in sprinting, ground contact time is too short for proprioceptors to have any input. In sprinting, foot ground impact force takes less than 50ms to reach its peak magnitude and ankle inversion can reach 17 degrees in as little as 40ms. Under these conditions the spinal reflex is too slow to initiate a corrective response.
Frans Bosch believes that, rather than reflexive, this type of neurological input is contained in the muscles themselves. The latest research coming out of last year's fascia congress seem to support this. The "cross talk" that EMG techs see on their monitors might just be a way that muscles communicate with one another. What implications does this have for injury prevention and rehabilitation? For starters, if you are doing proprioceptive training on wobble boards or something similar, you may just be training the athlete to be successful on a wobble board. It may have implications for those who need to perform on unstable surfaces (like surfers), but questionable for others.
The other points I get out of it is time and repetition. The way I see it, it's doubtful this type of motor re-organization can take place in the typical 12 week institutional rehabilitation scenario. The athlete must take an pro-active role in this process (A.T./coach directed; athlete centered). Even in Frans' world, laziness is a hinderance to performance and getting well.
Frans Bosch believes that, rather than reflexive, this type of neurological input is contained in the muscles themselves. The latest research coming out of last year's fascia congress seem to support this. The "cross talk" that EMG techs see on their monitors might just be a way that muscles communicate with one another. What implications does this have for injury prevention and rehabilitation? For starters, if you are doing proprioceptive training on wobble boards or something similar, you may just be training the athlete to be successful on a wobble board. It may have implications for those who need to perform on unstable surfaces (like surfers), but questionable for others.
The other points I get out of it is time and repetition. The way I see it, it's doubtful this type of motor re-organization can take place in the typical 12 week institutional rehabilitation scenario. The athlete must take an pro-active role in this process (A.T./coach directed; athlete centered). Even in Frans' world, laziness is a hinderance to performance and getting well.
1 comment:
JOe,
I'm going to ask a question out of ignorance.
You said:
"I mention the fact that in sprinting, ground contact time is too short for proprioceptors to have any input. In sprinting, foot ground impact force takes less than 50ms to reach its peak magnitude and ankle inversion can reach 17 degrees in as little as 40ms. Under these conditions the spinal reflex is too slow to initiate a corrective response."
Since the idaea of function is many muscles, joints, systems, etc, how then does the knee, hip, sacrum, spine have the ability to respond at ground contact when so little time is spent there? Wouldn't the information recieved in the sacrum for example take too long to get there as well as the response to that stimulus?
I'm not sure if I am making my question clear at all?
Thanks Joe and welcome back!!
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