Ch19 Pt2 AB

Question 1

Type 2x

Answer 1

Fast twitch, high force, fast fatigue
Fast glycolytic

Question 2

Type 2a

Answer 2

Fast twitch, moderate force, fatigue resistant
Fast oxidative glycolytic

Question 3

Type 1

Answer 3

Slow twitch, low tension, fatigue resistant
AEROBIC
Slow oxidative

Question 4

Type 1

Answer 4

Slow twitch, low tension, fatigue resistant
AEROBIC

Question 5

Henneman’s size principle (small to large)

Answer 5

ST> FT
Low > high activation

Question 6

Type 2 fibers are innervates by larger neurons and take more to recruit than:

Answer 6

More to recruit than their slow fibre counterparts

Question 7

What type of fibers are usually recruited first?

Answer 7

Slow Twitch
-take less to recruit

Question 8

EMG

Answer 8

Electromyography
-measure electrical signals created by muscle
-surface electrodes and needle electrodes
Allows assessment of which muscles are activated, amount of muscles activated, and which are under strain during what situations

Question 9

EMG types (3)

Answer 9

Raw: the actual electrical signal
Rectified: “negative” flipped to “positive”
Integrated: area under the rectified EMG

Question 10

MAV

Answer 10

Mean absolute value: used to determine the amplitude of the signal

Question 11

MDF

Answer 11

Median frequency: used to determine the frequency of firing

Question 12

What would happen to median frequency with repeated muscle contractions?

Answer 12

Decrease because the muscle would fatigue as they continue to contract, fast twitch are fatiguiging, not firing, not inactive compared to the slow twitch