Why Does Placing a Weight in an Outstretched Arm for a Lateral

question 59

Multiple Choice

Why does placing a weight in an outstretched arm for a lateral shoulder raise exercise feel more difficult than if the arm were bent at the elbow for the lateral shoulder raise?

• A)The actual mass of the weight has not changed, so the feeling of the exercise being more difficult comes solely from the mental perspective of the client.
• B)Placing the weight in the outstretched arm changes the COG to a more distal location, which requires more effort to maintain isometric stability or to produce movement of the outstretched position.
• C)The distance of the force from the COG applied by the weight decreases when the arm is outstretched, making the exercise more difficult.
• D)There is no difference in difficulty of the exercises whether the arm is bent or straight, it is simply a preference of form.

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Definitions:

Glenohumeral

Pertaining to the shoulder joint, which involves the articulation between the glenoid cavity of the scapula and the head of the humerus.

Pronation

A rotation of the forearm or hand so that the palm faces downward or backward.

Supination

The rotational movement of the forearm or foot that turns the palm or sole outward or upward.

Dorsiflexion

The action of lifting the foot upwards towards the shin, decreasing the angle between the dorsum of the foot and the leg.