I am now trying to do a model of a wushu/martial arts athlete doing a
jump, spin and kick all in the air before landing on a single leg.
There is interest in this area because it is a particularly difficult
technique to execute due to the fact that balancing on one foot is a
problem and that many athletes have incurred knee injuries.
I plan to use Qualisys to do a motion capture of the athlete executing
the move, then create a model using AnyBody to analyse. Is there any
model from the repository that I can start working from?
Also, which parts of the body should I place the markers?
It is a very interesting and challenging problem, but I think it
will be very difficult to model a fullbody model doing jumps and
landing on one leg, primarily due the dynamics and balance issues in
this kind of model.
I think it would be a good idea to start by modeling only the part
of the motion where the injury occurs, such the maybee the landing.
You could then model the legs only such as we do in the Gait3D model
in the model repository. This will require that you have measured
ground reactions, though. If you model the entire body and landing
on one leg it will be difficult to ensure that the model is in
balance. This is because there can be inaccuray in the recorded
motion but maybee more importantly between the anthropometry of the
model and the anthropometry of the recorded subject. This will
create an inbalance in the model, which can be be impossible to
recover if the person is standing on one foot, since it may require
that the foot is “glued” to the ground. So the it might be
impossible for the model to hold the balance and this will then
result in a muscle recruitment error.
So i think i would be a good idea to start by modeling only the legs
from the point where they hit the ground and to use measured ground
reactions forces if possible.
Concerning the marker location it would also be a good idea to look
at the Gait3D model in the repository.
In general i would advice not to start with the fullbody model doing
this kind of dynamic motion, but try to narrow down the problem and
the size of model, and if possible make use of measured ground
reaction forces.
Please do not heistate to write again if you have further questions.
Best regards
Søren, AnyBody Support
— In anyscript@yahoogroups.com, “giggsyagami07”
<giggsyagami07@…> wrote:
>
> Hello users,
>
> I am now trying to do a model of a wushu/martial arts athlete
doing a
> jump, spin and kick all in the air before landing on a single leg.
> There is interest in this area because it is a particularly
difficult
> technique to execute due to the fact that balancing on one foot is
a
> problem and that many athletes have incurred knee injuries.
>
> I plan to use Qualisys to do a motion capture of the athlete
executing
> the move, then create a model using AnyBody to analyse. Is there
any
> model from the repository that I can start working from?
>
> Also, which parts of the body should I place the markers?
>
> Regards,
> Robin Fong
>
— In anyscript@yahoogroups.com, “AnyBody Support” <support@…> wrote:
>
> Hi Robin
>
> It is a very interesting and challenging problem, but I think it
> will be very difficult to model a fullbody model doing jumps and
> landing on one leg, primarily due the dynamics and balance issues in
> this kind of model.
>
> I think it would be a good idea to start by modeling only the part
> of the motion where the injury occurs, such the maybee the landing.
>
> You could then model the legs only such as we do in the Gait3D model
> in the model repository. This will require that you have measured
> ground reactions, though. If you model the entire body and landing
> on one leg it will be difficult to ensure that the model is in
> balance. This is because there can be inaccuray in the recorded
> motion but maybee more importantly between the anthropometry of the
> model and the anthropometry of the recorded subject. This will
> create an inbalance in the model, which can be be impossible to
> recover if the person is standing on one foot, since it may require
> that the foot is “glued” to the ground. So the it might be
> impossible for the model to hold the balance and this will then
> result in a muscle recruitment error.
>
> So i think i would be a good idea to start by modeling only the legs
> from the point where they hit the ground and to use measured ground
> reactions forces if possible.
>
> Concerning the marker location it would also be a good idea to look
> at the Gait3D model in the repository.
>
> In general i would advice not to start with the fullbody model doing
> this kind of dynamic motion, but try to narrow down the problem and
> the size of model, and if possible make use of measured ground
> reaction forces.
>
> Please do not heistate to write again if you have further questions.
>
> Best regards
> Søren, AnyBody Support
>
> — In anyscript@yahoogroups.com, “giggsyagami07”
> <giggsyagami07@> wrote:
> >
> > Hello users,
> >
> > I am now trying to do a model of a wushu/martial arts athlete
> doing a
> > jump, spin and kick all in the air before landing on a single leg.
> > There is interest in this area because it is a particularly
> difficult
> > technique to execute due to the fact that balancing on one foot is
> a
> > problem and that many athletes have incurred knee injuries.
> >
> > I plan to use Qualisys to do a motion capture of the athlete
> executing
> > the move, then create a model using AnyBody to analyse. Is there
> any
> > model from the repository that I can start working from?
> >
> > Also, which parts of the body should I place the markers?
> >
> > Regards,
> > Robin Fong
> >
>