Acute Responses to Aerobic Exercise Flashcards
Aerobic Exercise
large-muscle , rhythmic activities that can be sustained without undue fatigue for at least 20 minutes.
Steady State
Constant sub maximal exercise below the lactate threshold where the oxygen consumption is meeting the energy requirements of the activity.
Parasympathetic Nervous System
A subdivision of the autonomic nervous system that is involved in regulating the routine functions of the body, such as heartbeat, digestion, and sleeping.
Vagal Withdraw
Effect produced on the heart when the parasympathetic nerve fibers, which are carried in the vagus nerve, controlling the heart rate are inhibited by the sympathetic nervous system during exercise, thus increasing the heart rate.
Epinephrine
a hormone released as part of the sympathetic response to exercise; also called adrenaline.
Sympathetic Nervous System
A branch of the autonomic nervous system responsible for mobilizing the body’s energy and resources during times of stress and arousal.
Norepinephrine
a hormone released as part of they sympathetic response to exercise.
Excess Post-Exercise Oxygen Consumption (EPOC)
As cardiac output, blood pressure, and respiratory ventilation returns to resting levels, oxygen consumption slowly declines as well, but is till elevated above resting levels.
Anaerobic Threshold (AT)
lactate accumulates progressively in the blood, the oxygen deficit and corresponding EPOC are extremely high, and exercise cannot be performed for more than a few minutes.
Ventilatory Threshold (VT)
point of transition between predominately aerobic energy production to anaerobic energy production; involves recruitment of fast-twitch muscle fibers and identified via gas exchange during exercise testing.
First Ventilatory Threshold (VT1)
occurs at approximately the first time that lactate begins to accumulate in the blood, represents hyperventilation relative to VO2 , ans is caused by the need to blow off the extra CO2 produced by the buffering of acid metabolites.
Second Ventilatory Threshold (VT2)
occurs at the point where lactate is rapidly increasing with intensity, and represents hyperventilation even relative to the extra CO2 that is being produced.
The point at which blowing off CO2 is no longer adequate to buffer the increase in acidity that is occurring with progressively intense exercise.
Talk Test
a method for measuring exercise intensity using observation of respiration effort and the ability to talk while exercising.
Glycogenolysis
epinephrine causes the release of glucose from the liver, which allows blood glucose levels to remain high to provide fuel for the exercising muscles.
