PNF Stretching PDF (not all-inclusive)
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| show | Specialized sensory receptors located within joints, muscles, & tendons
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| show | Relay info concerning muscle dynamics to conscious & sub-conscious parts of our CNS
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| show | Most is processed at the sub-conscious levels so we don't have to think about tasks such as maintaining posture or position of our body parts
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| show | Receptor
Sensory neuron
Integration center
Motor neuron
Effector
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| What is the receptor? | show 🗑
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| show | Transmits afferent impulses to the CNS
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| Simple reflex arc? | show 🗑
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| Complex reflex arc? | show 🗑
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| show | 3-10 infrafusal fibers, which provide input to regulate the activity of muscle.
Extrafusal fibers are effective & when stimulated, they contract, shortening the muscle
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| What influences the muscle spindle? | show 🗑
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| show | Increases tension & increases rate of action potential generation.
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| Muscle Contraction | show 🗑
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| show | Extrafulsal fibers are excited, causing the muscle to contract
This contraction attempts to prevent the muscle from stretching any further
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| Afferent Impulses | show 🗑
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| Interneuron Synapse | show 🗑
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| show | Tendons near the musculotendinous junction
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| How is a GTO activated? | show 🗑
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| show | Inhibit motor neurons serving the contractile muscle (autogenic inhibition);
Stimulate motor neurons serving the antagonistic muscle group
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| Overal, what happens because of the GTO reflex? | show 🗑
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| What is reciprocal inhibition? | show 🗑
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| What is autogenic inhibition? | show 🗑
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| show | Ability of motor cortex to override autogenic inhibition
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| How does PNF compare to other types of stretching? | show 🗑
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| How many repetitions of PNF should be performed to achieve the greatest gains? | show 🗑
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| show | 3-10 seconds
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| What is the optimal contraction intensity in PNF stretching? | show 🗑
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| Hold-Relax Stretching | show 🗑
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| Contract-Relax Stretching | show 🗑
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| What is the aim of contract-relax? | show 🗑
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| show | Acute injury or if active ROM is painful;
If contraction of restricting mm is too painful/weak, can reverse the direction of contraction
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| show | Mm lengthened to point of limitation;
Pt performs sub-max isometric contraction b/t 5-8";
Limb actively moved by pt into new range via concentric contraction of mm opposite range-limiting mm
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| What type(s) of inhibition is used by hold-relax with agonist contraction? | show 🗑
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