PNF Flashcards
Impulse causing the recruitment and discharge of additional neurons is said to be ____
Facilitatory
Stimulus that causes neurons to drop out is called ____
inhibitory
What causes an impulse volley?
Impulse traveling down corticospinal tract or afferent impulse traveling up
Weak muscles would be aided by ___
Facilitation
Tight or spastic muscles would be decreased (aided_ by ___
Inhibition
Name the 2 physiological concepts of PNF
Autogenic inhibition
Reciprocal inhibition
Explain the autogenic inhibition
Inhibition mediated by afferent fibers from a stretched muscle acting on the alpha motor neurons supplying that muscle, causing the muscle to relax
Relaxation of the agonist muscle
What happens at the level of the muscle if the stretch is held or if tension is high enough?
The golgi tendons organs eventually override the excitatory impulses and the inhibitory impulses take over
Explain the reciprocal inhibition
Involves agonist and antagonist muscles
When agonist muscle receives excitatory impulses, the antagonist muscles are inhibited by afferent impulses
What is the result of a quick stretch of the antagonist muscle?
Facilitates contraction of the agonist muscle
3 techniques of PNF stretching
Contract relax
Hold relax
Slow reversal hold relax
Explain the contract relax technique
Stretching the antagonist
Isotonic contraction of antagonist
Relaxation and passive stretching of antagonist
Explain the hold relax technique
Stretching the antagonist
Isometric contraction of antagonist
Passive stretch of antagonist
Explain the slow-reversal-hold-relax
Isotonic contraction of agonist (or passive antagonist stretch)
Isometric contraction of antagonist (once at end range)
Isotonic contraction of agonist
2 important points of PNF
-There is always inhibition and excitation happening
-A shift in the balance is what will cause the contraction or relaxation
