Muscle Activity during Gait

Question 1

What is an Isometric contraction

Answer 1

A muscle contratcion without motion, used to stabalise a joint

Question 2

What is an Eccentric Contraction

Answer 2

A lengthening of the muscle generally involved in lowering or slowing a movement down

Question 3

What is a Concentric contraction

Answer 3

When the total length of the muscle shortens to produce tension

Question 4

During the Initial contact phase of the Gait cycle which muscles will be performing eccentric contractions and why

Answer 4

Tibialis Anterior
Extensor Digitorum Longus
Extensor Digitorum Brevis
Extensor Hallucis Brevis
Extensor Hallucis Loungus

They eccentrically contract to lower the foot to the ground.

They are further activated isometrically during the swing phase to ensure the clearance of the foot from the ground

Question 5

During Midstance which muscles will perform an eccentric contraction and why

Answer 5

Tibialis Posterior
Gastrocnemuis
Soleus
Flexor Hallucis
Flexor Digitorum Longus
Peroneus Longus
Peroneus Brevis

These muscles aim to slow the advance of the Tibia over the foot

They transition to a concentric contraction during the end of the Stance Phase (Heel Off Toe Off) in order to propell the foot forward