Biomechanics question!

Question

What is the apparent relationship between EMG activity and muscle force and what evidence can you provide to support this relationship?

Also,

Describe the response of the biceps and triceps during supination of the forearm and what are the roles that the muscles fulfill during this movement?

Answer 1

the EMG registeres the muscle contractions. So when the muscle force is high, the amplitude of the contractions registered on the EMG are bigger, higher and more frequent.

Also,

during supination of the arm:

triceps has no role

biceps has a certain minimal role ( there are several other muscles responsible of the supination movement)