Specifications

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• Fin is a force, but it has not physiological significance for a muscle except for internal purposes. The
reason why it is included in the output is that it is inherited from the AnyScript classes that a muscle
is derived from.
• Fout is a force, but it has not physiological significance for a muscle except for internal purposes.
The reason why it is included in the output is that it is inherited from the AnyScript classes that a
muscle is derived from.
• Lmt is the total length of the muscle-tendon unit, i.e. the origin-insertion length.
• Lm is the length of the muscle's contractile element.
• Lt is the length of the tendon. This is not necessarily the same as Lt0 because the tendon is linearly
elastic and therefore stretches slightly with the force.
• LmtDot is the rate of change of Lmt, i.e. the length change velocity of the total muscle-tendon unit.
• LmDot is the contraction velocity of the contractile element.
• Activity is the muscle active state in fractions of maxmum voluntary contraction.
• CorrectedActivity for this muscle model is the same as Activity.
• Fm is the force in the muscle's contractile element. For this muscle type it is equal to the total force
in the muscle-tendon unit because the muscle does not have any parallel components.
• Ft is the force in the tendon. For this muscle model it is the same as Fm.
• Fp is not relevant for this type of muscle model.
• Strength is the muscle's strength at each moment of the movement.
• Ft0 is not relevant for this type of muscle model.
• Ft0Grad is the derivative of tendon force with respect to active state. For this muscle model is
amounts to exactly the same as the Strength variable, but for muscles with parallel elasticity the
two properties will be different.
• PennationAngle is not relevant for this muscle model type.
• EPOTt is the potential elastic energy in the tendon.
• EPOTp is the potential elastic energy in the parallel-elastic element, which is not included in this