PNF Flashcards
Afterdischarge
Effect of a stimulus continues after the stimulus stops. As strength/duration increase so does after-discharge.
Temporal Summation
Succession of weak stimuli occurring within a certain short period of time summate to cause excitation
Spatial Summation
Weak stimuli applied simultaneously to different areas of the body reinforce each other to cause excitation.
Irradiation
Spreading and increased strength of a response. Occurs when either the # or strength of a stimuli is increased. response may be excitation or inhibition. The spread of the response to stimulation.
Reciprocal Inhibition
Contraction of muscles is accompanied by simultaneous inhibition of their antagonists. Necessary for coordinated movement.
Reinforcement
Strengthen weaker muscles by altering resistance given to strong muscles.
Manual Contact
PT hand must be on SKIN. Apply pressure opposite the direction of motion. Don’t hold circumferentially.
When does the initial command come?
Immediately before the stretch reflex.
What can affect the strength of the contraction?
Volume/intensity of the command.
What are the three parts to a verbal command?
Preparation: Ready pt for action
Action: Tells pt to start action
Correction: tells pt how to correct the modify the action.
How does vision affect force?
Can promote a more powerful muscle contraction. Moving eyes will affect head/body motion. Eye contact with PT = communication.
How is traction used?
Stimulates joint receptors. Aid in elongation of muscle, facilitate motion, resist some part of the motion.
How is approximation used?
Promote stabilization, facilitate WB and contraction of antigravity muscles, resist some component of motion.
Stretch stimulus
Occurs when a muscle is elongated. “Wind up the limb” Lengthened muscle tension.
Stretch reflex
Elicited from muscles that are under tension, either from elongation or contraction. “quick stretch”
What is normal timing?
Distal to proximal.
How does evolution of control proceed?
Cranial to caudal and proximal to distal.
Timing for emphasis
Changing normal sequencing of motions to emphasize a particular motion or desired activity. Resist isometric or maintained contraction of the strong muscles which exercising the weaker muscles.
Rhythmic initiation
Rhythmic motion of the body part through the desired range, starting with passive motion and progressing to active resisted movement.
Goals of Rhythmic Initiation
Aid in initiation of movement Improve coordination, and sense of motion Normalize rate of motion Teach the motion Help the patient relax
Combination of isotonics
Combined concentric, eccentric and stabilizing contraction of one group of muscles (agonists) w/o relaxation
Goals of Combination of isotonics
Active control of motion Increase coordination Increase AROM Strengthen Functional training in eccentrics