Practice Quiz

ACSM Personal Trainer

Category - Initial Client Consultation and Assessment

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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?
  1. 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.
  2. 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.
  3. The distance of the force from the COG applied by the weight decreases when the arm is outstretched, making the exercise more difficult.
  4. There is no difference in difficulty of the exercises whether the arm is bent or straight, it is simply a preference of form.
Explanation
Answer: B - Placing a weight in an outstretched arm for a lateral shoulder raise exercise feels more difficult than if the arm were bent at the elbow because it changes the COG to a more distal location, which requires more effort production to maintain isometric stability or to produce movement of the outstretched position.
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