Anybody there solved problem 7.3 of the last years exam? its about delta(L) pennate vs. delta(L) parallel muscle if the muscle shortens to 50% of it's original size...
thanks in advance
pennate muscle
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- Registriert: 28.03.2012, 16:24
Re: pennate muscle
do you want to compare your results or do you need an explanation?
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- Registriert: 07.11.2016, 15:14
Re: pennate muscle
I need an explanation, please.
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- Beiträge: 102
- Registriert: 28.03.2012, 16:24
Re: pennate muscle
the pennate muscle shortens much less than a parallel, because the shortening of a muscle depends on the effective parallel length. In our case we want to look at the fiberlengths itself, so interpretated in that way that i simply said the length of my parallel muscle shortens to the half which is 3cm, the fiber length of the pennate is defined as l= a/cos(tetha) and for shortening i divide it by 2. so i get a factor of pennate to parallel of 0.385.
but i don't think that this is the same like you say the muscle shortens in this way, especially for the pennate, this is only if yu look at the fiber i think!
but i don't think that this is the same like you say the muscle shortens in this way, especially for the pennate, this is only if yu look at the fiber i think!
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- Beiträge: 14
- Registriert: 30.11.2015, 20:46
Re: pennate muscle
Oh there is a seperate thread for that...
I c&p my thoughts:
My considerations are, that the parallel muscle will simply shorten by the amount of each fiber, e.g. while the pennate muscle will only shorten where is the number of Elements in Series (or in the slides e.g. the height of the section), e.g the ratio will be
@tola99: How do you get to ? You used the CSA for that, right? In the tutorial i wrote down that he said, the movement is only but maybe I got that wrong... I looked into the slides of Angeli's Motor Muskel where a model is given for muscles and there it says that the length is also but they write the angle on a different location (comparing to the slides, it would be )...
I c&p my thoughts:
My considerations are, that the parallel muscle will simply shorten by the amount of each fiber, e.g. while the pennate muscle will only shorten where is the number of Elements in Series (or in the slides e.g. the height of the section), e.g the ratio will be
@tola99: How do you get to ? You used the CSA for that, right? In the tutorial i wrote down that he said, the movement is only but maybe I got that wrong... I looked into the slides of Angeli's Motor Muskel where a model is given for muscles and there it says that the length is also but they write the angle on a different location (comparing to the slides, it would be )...