FREE NAFC Exercise Science Questions and Answers
Which component of physical fitness is primarily improved by regular aerobic exercise?
Regular aerobic exercise primarily improves cardiovascular endurance,
which is the ability of the heart, lungs, and blood vessels to deliver oxygen to working muscles during prolonged physical activity.
What is the term for the highest rate at which oxygen can be taken up and utilized during exercise?
VO2 max is the maximum rate at which oxygen can be taken up and utilized by the body during intense exercise, serving as a key indicator of aerobic fitness.
During resistance training, what type of muscle contraction occurs when the muscle lengthens while producing force?
An eccentric contraction occurs when the muscle lengthens while still generating force, often seen during the lowering phase of a lift.
Which type of muscle fiber is most resistant to fatigue and primarily used during endurance activities?
Type I muscle fibers, or slow-twitch fibers,
are more resistant to fatigue and are used primarily during endurance activities due to their high aerobic capacity.
Which hormone is primarily responsible for the regulation of blood glucose levels during exercise?
Glucagon is responsible for raising blood glucose levels by promoting the release of glucose from the liver, especially important during exercise when energy demands increase.
What is the primary function of the cardiovascular system during exercise?
The cardiovascular system's primary function during exercise is to deliver oxygen and nutrients to working muscles and tissues and to remove carbon dioxide and other waste products.
What is the role of adenosine triphosphate (ATP) in muscle contraction?
ATP is the primary energy carrier in cells, and it provides the energy needed for muscle contractions.