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autogenic inhibition
goal: stretch/lengthen
how: contract
reciprocal inhibition
goal: stretch/lengthen
how: contract opposing
autogenic facilitation
goal: produce force/strengthen
how: stretch
reciprocal facilitation
goal: produce force/strengthen
how: stretch opposing
all or none principle
individual muscle fibers within a given motor unit will either fire and contract maximally or not at all
muscle length/tension relationship
option force is provided at 50% stretch/length
muscle force/velocity relationship
highest forces are at a slow speed concentrically and fast speed eccentrically
lowest forces are at a slow speed eccentrically and a fast speed concentrically
biarticular muscles
2 joints
multiarticular muscles
more than 2 joints
active insufficiency
shorts too much to produce effective tension or force
can contract at one but not other
passive insufficiency
stretched to limit across both joints, which stops further movement