Contractions

Question 1

Isometric

Answer 1

Tension increases, no movement and length stays the same

Question 2

Isotonic

Answer 2

Tension develops to cause or control movement

Question 3

Give an example of a concentric and eccentric muscle action

Answer 3

In quads during a squat
Concentric - squat upward phase
Eccentric - squat downward phase

Question 4

What is the popping sarcomere hypothesis and why is it bad?

Answer 4

Overstretched sarcomeres cause the actin and myosin to no longer overlap and be able to form any cross bridges.
It can disrupt the sarcomere, cause membrane damage and impairment of E-C coupling.

Question 5

What is isokinetic Exercise?

Answer 5

A type of strength training that examines conc/ecc properties of a muscle action, ie muscle strength. It uses a machine that produces a constant speed.

Question 6

Give an example of agonist and antagonist muscle action

Answer 6

When running, in the forward leg the quads are contracting (agonist) and the hamstrings are lengthening (antagonist)

Question 7

Give an example of when stabiliser muscles are used

Answer 7

During a bicep curl, the scapula muscles stabilise the glenohumeral joint.

Question 8

What methods could you use to measure muscle action?

Answer 8

Palpation of the superficial muscles,
EMG - shows contraction intensity and duration,
Muscle stimulation with electricity to maximally involuntary contract muscle