Active and Passive Insufficiency PDF

Active and passive insufficiency Friday, 11 April 2025 12:25 Active insufficiency Definition: - Occurs when a multi-joint muscle cannot generate maximum force because it is too shortened Why it happens: - When a muscle crosses two or more joints and is asked to contract (shorten) acro...

Active and passive insufficiency Friday, 11 April 2025 12:25 Active insufficiency Definition: - Occurs when a multi-joint muscle cannot generate maximum force because it is too shortened Why it happens: - When a muscle crosses two or more joints and is asked to contract (shorten) across all those joints at once, it cant maintain tension effectively- its already "used up" its ability to contract Example: Hamstrings - Try to extend your hip and flex your knee at the same time like when trying to bring your heel toward your glute while standing- the hamstrings are too shortened to generate full force at both joints Passive Insufficiency Definition: Occurs when a multi-joint muscle cannot be stretched enough to allow full range of motion at all joints it crosses Why it happens: The muscle is too tight or stretched to allow full motion at all the joints at the same time. Example: Hamstrings - Try to touch your toes with your knees straight- the hamstrings are lengthening over both the hip and knee and you feel tightness that’s passive insufficiency limiting your motion