Certified-Group-Exercise-Instructor-(ACSM-GEI).pdf -...

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ACSM-GEI Trainers Certified Group Exercise Instructor
Question: 63 The human body adapts to exercising in the heat by increasing plasma volume, decreasing core temperature, decreasing heart rate, and increasing the rate of sweating. How soon do these changes occur?
Question: 64 Group Fitness Instructors who suggest use of closed chain exercises during their sessions are taking advantage of WHICH exercise principle?
Group Fitness Instructors who choose to use closed chain exercises during their sessions are taking advantage of the fact that a closed-chain exercise tends to produce joint compression instead of shear. Consider the squat versus the (open chain) seated knee extension. In the open chain knee extension exercise, as the foot moves forward in space pulled by the quadriceps, the tibia tends to shear or translate forward on the femur, producing joint stress. In contrast, during a squat, the contraction of the quadriceps is balanced by a protective contraction of the hamstrings and the tibia does translate forward during the movement.

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