Biomechanics Nervous System
voluntary muscle activation occurs through what?
increase excitatory input to motor neuron pool leading to increased # of active motor units and increase motor unit firing
more for general force production
more optimal activation of agonist and relaxation of antagonists
trained by practicing the exact task upon which you want to improve
muscle spindle reflex
monitor muscle length and rate of stretch
when agonist is stretched it monosynaptically excites the MN pool of that muscle and other agonists
activation is larger with larger/faster stretch
golgi tendon organ reflex
monitors tension in the muscle
responds much more to active tension as opposed to passive tension
GTO activation leads to what?
inhibition of the agonist and excitation of the antagonist
3 inner ear proprioceptors
saccule-sense vertical linear direction
utricle-senses horizontal linear acceleration
how does inner ear vestibular reflex work?
acceleration moves endolymph which bends hair cells and provides information to CNS
vestibular system is crucial for what?
balance, especially in decreased visual conditions
tonic neck reflex
neck flexion excites pulling muscles, extension excites pushing muscles