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An experiment is performed in which a muscle–tendon unit is fixed at some (an unknown ) length
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| body | --uriencoded--\ell%5e%7Bmt%7D |
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, the muscle is activated to a
specified predetermined level, and the tendon force is measured once the muscle and tendon have reached equilibrium (
steady statei.e., muscle and tendon forces are equal). The muscle has the following active and passive force–length relationships:
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The tendon has the following force–strain relationship:
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The muscle and tendon parameters are
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| body | --uriencoded--\ell_o%5em = 10~\text%7Bcm%7D |
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,
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| body | --uriencoded--\ell_s%5et = 20~\text%7Bcm%7D |
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,
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| body | --uriencoded--F_o%5em = 5000~\text%7BN%7D |
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, and pennation
.
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