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Hello Biomech-l colleagues:
I am interested in the role of mono and biarticular muscles during
stretch-shorten cycle (SSC) in rebound jumps. From my data (and other studies
as well) it is possible to observe that biarticular muscles experience a
"quasi"-isometric period (where they remain without large changes in muscle
length) during the transient phase (before the push-off phase), so they have
a different SSC stimulus when compared with uniarticular muscles.
Theoretically, due to the shorter coupling time, uniarticular muscles would
be more potentate than biarticular muscles (does it matter?).
Does someone have a guess what would be the implications on the role of uni
and biarticular muscles, i.e., the biarticular muscle will still be able to
uniquely control the direction of the external vector (Jacobs & Van Ingen
Schenau, 1992: Doorenbosch & Van Ingen Schenau, 1995)? And the uniarticular
muscles will still be able to produce most propulsive force/work, without
having any influence over the movement control (Doorenbosch et al., 1997)?
Is someone interested in discussing (speculating) these issues?
I will post a summary of responses as soon as possible. Those who do not want
to have their names sticked on their comments in the summary, please, let me
know.
Andre Rodacki
Rodacki@aol.com
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I am interested in the role of mono and biarticular muscles during
stretch-shorten cycle (SSC) in rebound jumps. From my data (and other studies
as well) it is possible to observe that biarticular muscles experience a
"quasi"-isometric period (where they remain without large changes in muscle
length) during the transient phase (before the push-off phase), so they have
a different SSC stimulus when compared with uniarticular muscles.
Theoretically, due to the shorter coupling time, uniarticular muscles would
be more potentate than biarticular muscles (does it matter?).
Does someone have a guess what would be the implications on the role of uni
and biarticular muscles, i.e., the biarticular muscle will still be able to
uniquely control the direction of the external vector (Jacobs & Van Ingen
Schenau, 1992: Doorenbosch & Van Ingen Schenau, 1995)? And the uniarticular
muscles will still be able to produce most propulsive force/work, without
having any influence over the movement control (Doorenbosch et al., 1997)?
Is someone interested in discussing (speculating) these issues?
I will post a summary of responses as soon as possible. Those who do not want
to have their names sticked on their comments in the summary, please, let me
know.
Andre Rodacki
Rodacki@aol.com
---------------------------------------------------------------
To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl
For information and archives: http://isb.ri.ccf.org/biomch-l
---------------------------------------------------------------