Lecture 3

Question 1

Kinetics

Answer 1

understanding the forces that cause motion

Question 2

Contraction of muscle

Answer 2

Initiated when muscle fiber of a motor unit receives a stimulus transmitted through an Alpha neuron

Question 3

Sarcomere

Answer 3

one basic muscle fiber
- composed of Actin (thin filament) & Myosin (thick filament)
-shortens & produces force

Question 4

Force

Answer 4

mass x acceleration

Question 5

Torque

Answer 5

PERPENDICULAR force x Length of lever arm (moment arm)

Question 6

Longer lever arm (moment arm)

Answer 6

Greater Torque
- more advantageous in MMT to protect joints from to much force

Question 7

Work

Answer 7

Force x Displacement
-energy expended by muscles

Question 8

Force & Velocity

Answer 8

Inverse relationship

Question 9

Slower velocity

Answer 9

= More capacity to recuit muscle fibers and generate higher force

Question 10

Lever arms

Answer 10

1st class= teeter totter
-load, fulcrum, effort
2nd class= wheelbarrow
- effort, load, fulcrum
3rd class= bicep curl
-fulcrum, effort, load

Question 11

Effort

Answer 11

ability to recruit & fire motor units

Question 12

Type 1 fibers

Answer 12

aerobic
- produce little lactic acid

Question 13

Type 2 fibers

Answer 13

anaerobic
- produce a lot of lactic acid

Question 14

Length- Tension relationship

Answer 14

Slightly beyond resting length= OPTIMAL FORCE GENERATION

Question 15

Isokinetics

Answer 15

manipulated by speed “velocity”
- use variable resistance

Question 16

Isometric

Answer 16

static

Question 17

Isotonic

Answer 17

Dynamic
Concentric & Eccentric

Question 18

Active Insufficiency

Answer 18

shorted to the point cannot generate adequate tension

Question 19

Passive Insufficiency

Answer 19

stretched to far it cannot lengthen any more

Question 20

Acceleration

Answer 20

velocity/ time

Question 21

Velocity

Answer 21

displacement/time