Passive strength (passive tension or passive stiffness) typically increases when muscle length is greater than at rest, whereas active strength (also called active tension or active stiffness) is typically decreases. This relationship is known as the relationship between muscle length and tension.
The relationship between length and tension refers to the relationship between the length of a muscle and the force it produces.
In general, as muscle length increases, the connective tissue within the muscle (such as tendons and fascia) stretches, thus increasing the passive force generated by the muscle.
At the same time, muscles are less likely to generate force when stretched, so the active force generated by the muscle normally decreases.
So the correct answer to the question is:
Passive force increases and active force decreases.
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