2016.07.08 CSCS Daily Study Question:
You are conducting a plyometric depth jump exercise with a group of female volleyball players. You instruct them to step off of a wooden box and then jump almost immediately after their feet contact the floor. According to the mechanical model of plyometric exercise, what happens to the stored elastic energy if there is too great of a time delay between the eccentric and concentric phases of the exercise?
(A) Energy dissipates as heat
(B) Energy dissipates into the floor
(C) Energy is stored in the leg muscles
(D) Energy is stored in the leg tendons
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Correct Answer:
(A) Energy dissipates as heat
Explanation:
When the athlete contacts the ground, the musculotendinous units are stretched, generating elastic energy. When the concentric action (the jump) is conducted immediately afterwards, the elastic energy is released, contributing to total force production. Too long of a delay causes the stored energy to dissipate and be lost as heat.
Reference:
Essentials of Strength Training & Conditioning 3rd edition p. 415 – 415, 445
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2016.07.08 CSCS Daily Study Question