Strengthening - Physical Principles

Question 1

Stop/start

Answer 1

Newtons 1st law

Increases muscle work required to re-start movement

Question 2

Reduce momentum

Answer 2

Newtons 2nd law

Slowing or varying speed, increased muscle work to elicit change

Question 3

Reduced movement

Answer 3

Against gravity 
Auto resisted
Free weights
Theraband
Body weight

Question 4

Increase friction

Answer 4

Newtons 3rd law

Increases muscle work to start or sustain movement

Question 5

How can you progress a strengthening exercise?

Answer 5

Use different types of muscle contraction eg. concentric and eccentric
Strengthen whole range (mid>inner>outer)
Lengthen the level (bent arm>straight arm)
Add functional activity (specificity)
Vary speed - ballistic eg. jumpy if MRC grade 4+
Increase resistance > heavier weight, progress theraband, body weight etc.