UNIT 3 - AOS 2 acute responses Flashcards
(25 cards)
What are acute responses?
Is the instant use of the respiratory, cardiovascular and muscular responses. There is an increased demand for oxygen and energy substrates during exercise, and acute responses are activated to meet these needs.
What is the cardiovascular system?
The cardiovascular system allows the delivery of many substances around the body, mainly allowing oxygen to reach the working muscles during exercise.
Keynote: Cardio - heart and Vascular - blood vessels & veins.
What are the cardio parts of the cardiovascular system?
Heart Rate
Stroke Volume
Cardiac Output
What is heart rate?
Number of beats of the heart per minute
What is stroke volume?
The volume of blood pumped per beat of the heart
What is cardiac output?
Cardiac Output = Stroke Volume x Heart Rate.
The volume of blood pumped by the heart per minute
What are the vascular parts of the cardiovascular system?
Venous return
AVO2 difference
Redistribution of blood flow
What is the venous return?
The blood returning to the heart via the venous system
What is AVO2 difference?
The difference in the concentration of oxygen in the
arterial blood and venous blood.
What is the redistribution of blood flow?
Altering the percentage of cardiac output that is distributed to various body sites.
What are the acute respiratory responses to exercise?
Respiratory Rate
Tidal volume
Ventilation
What is Respiratory Rate?
Number of breaths per minute
What is Tidal volume?
The volume of air breathed in per breath
What is Ventilation?
V=PR x TV.
The volume of air breathed in per minute
What is the muscular system?
Acute responses to the muscular system occur in the actual working muscles and are influenced by factors such as intensity, type and duration of exercise.
What are the acute muscular responses to exercise?
Motor Unit Recruitment Muscle Temperature Oxygen uptake and consumption (πππ) Metabolic byproducts Energy substrates
What is Motor Unit Recruitment?
The number and frequency of motor units recruited for
muscle contractions
What is Muscle Temperature?
The degree or intensity of heat present in the muscles.
What is Oxygen uptake and consumption (πππ)?
The volume of oxygen that can be taken up and used by the
body.
What are metabolic byproducts?
Substances leftover from metabolic processes.
What are Energy substrates?
Fuel sources required for ATP resynthesis
What is Blood Lactate?
There is always blood lactate in the blood. When we work at a higher intensity, blood lactate causes fatigue.
What is OBLA (Onset of blood accumulation)?
Is the point when blood lactate begins the accumulate above resting levels, as a result, lactate (clearance) from blood can no longer keep pace with lacate production.
What is LIP (lactate inflection point)?
It is the last point before fatigue. The body can still work, but it may cause pain. The lactate inflection point comes later for an anaerobically fitter person.
