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:

Elastic Arteries

Large arteries that contain elastic tissue in their walls, enabling them to stretch and recoil for blood flow regulation.

Precapillary Sphincter

A band of smooth muscle that regulates blood flow into the capillaries, largely controlling the microcirculation.

Action Potentials

Electrical impulses that travel along the membrane of a nerve or muscle fiber, initiating activity or movement.

Coronary Sinus

Short trunk that receives most of the veins of the heart and empties into the right atrium.