Lab G: Elbow and Forearm

Stand 3 feet away from the wall, facing toward the wall, facing toward the wall. Perform push-ups with hands against the wall. Describe the movement occurring, contraction & muscles that are working

Elbow Flexion - eccentric - triceps & anconeus

Elbow Extension - concentric - triceps & anconeus

Grasp a locked doorknob and attempt to turn your forearm so that you palm is facing up (no movement occurs). Describe the type of movement, contraction, and muscles that are working.

Movement: supination

Contraction: pure isometric

Muscles: biceps brachii, supinator, brachioradialis

Imagine you are shaking hands with a skeleton. Turn your forearm inward and outward and analyze the relationship of the movement at the radius and ulna.

When the forearm is turning inward, this is called pronation. Pronation is when the radius crosses over the ulna.

When the forearm is turning outward, this is called supination. Supination is when the radius and ulna are parallel to each other

During concentric elbow flexion, what muscles are active

biceps brachii

brachialis

brachioradialis

pronator teres (assists)

During eccentric elbow extension, what muscles are active

biceps brachii

brachialis

brachioradialis

pronator teres (assists)

During concentric forearm supination, what muscles are active

supination

biceps brachii

brachioradialis (assists)

During eccentric forearm pronation, what muscles are active

supinator

biceps brachii

brachioradialis

During concentric elbow extension, what muscles are active

triceps

anconeus

During eccentric elbow flexion, what muscles are active

triceps

anconeus

During concentric forearm pronation, what muscles are active

pronator teres

pronator quadratus

brachioradialis