Neuro

Question 1

large motor units are typically found in what muscles

Answer 1

larger muscles- eg. Gastroc

Question 2

small motor units typically found in what muscles

Answer 2

small muscles- eg. dorsal interossei

Question 3

type I fibers

Answer 3

slow twitch

highly fatigue resistant

Question 4

Type IIA fibers

Answer 4

fast oxidative glycolytic
fast contraction times
more fatigue resistant than type IIb

Question 5

Type IIB fibers

Answer 5

fast glycolytic
rapid contraction times
innervated by alpha motor neurons
large neuron to fiber ratio

Question 6

recruitment order of muscle fibers

Answer 6

I –> IIA –> IIB

small units –> large units

Question 7

asynchronous activation

Answer 7

activation is temporarily spaced but summed with preceeding motor unit activity

Question 8

synchronous activation

Answer 8

large and small motor units activated together

ie. ballistic movements, adaptation from weight training

Question 9

frequency coding

Answer 9

firing rate of neurons

Question 10

recruitment in small muscles

Answer 10

all units activated when at 30-50% max voluntary contraction

Question 11

recruitment in large muscles

Answer 11

still recruiting motor units at 100% max voluntary contraction

Question 12

pacinian corpuscle

Answer 12

sensory receptor in skin that responds to pressure- inhibits muscle contraction

Question 13

when are significant gains seen in strength training

Answer 13

first 4 weeks

Question 14

effect of immobilization on motor unit activity

Answer 14

decreases motor unit activity

Question 15

effect of inflammation on muscle activation and muscle strength

Answer 15

decreases muscle activation and strength