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

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.