Lecture 17 - Energy Systems and Exercise II Flashcards
What is the only system that can be measured directly and precisely
Aerobic System
What sorts of efforts are required for testing energy systems
Often maximal efforts
Define power
peak output (rate of use)
Define capacity
total output over time
Where would the energy be derived in an alactic anaerobic power test?
Energy from ATP-PC system (ATP stores & PC)
Where would the energy be derived in an anaerobic power and capacity test?
Energy from both phosphate and lactate systems
What is VO2max?
maximal oxygen consumption - refers to the maximum amount of oxygen that an individual can utilize during intense exercise
What is the criteria for determining VO2max?
Primary: a) VO2 levels off despite increasing workload, indicating a plateau in oxygen consumption. Secondary: b) Respiratory Exchange Ratio (RER) value exceeding 1.10 or 1.15, suggesting anaerobic contribution.
c) Blood lactate levels reaching a predetermined threshold . d) Attainment of age-predicted maximum heart rate, often used in conjunction with other criteria. e) Voluntary exhaustion demonstrated by subjective signs such as fatigue and inability to continue.
What do progressive tests do?
Aim to determine VO2max by progressively increasing exercise intensity until exhaustion. While VO2 is not directly measured, VO2 max is predicted based on the last workload achieved.
What do submaximal aerobic tests do? Are they accurate?
AEROBIC CAPACITY: These tests estimate aerobic capacity based on heart rate responses during submaximal exercise. They are less accurate than maximal tests but are suitable for assessing the general population’s aerobic fitness.
What is the ratio between anaerobic and aerobic capacities in children compared to adults?
Children exhibit relatively more aerobic than anaerobic capacity compared to adults. This is attributed to factors such as lower ATP-PC stores, lower oxygen deficits, and lower peak blood lactate levels. As a result, children may experience rapid fatigue but also rapid recovery from intense efforts.
What is the ratio between VO2max values as will as anaerobic and aerobic performance in women compared to males?
Females generally exhibit lower VO2 max values compared to males, partly due to differences in muscle mass. Anaerobic performance tends to be slightly less in females when accounting for muscle mass differences
Describe the assessment methods for the ATP-PC system?
Maximal Anaerobic Power Tests measure the peak power and total work done in short, maximal efforts.
What are the test characteristics for ATP-PC tests?
Short, high-intensity exercises (<10 seconds). Immediate energy supply from ATP and phosphocreatine.
Describe the assessment methods for the Glycolytic system?
Lactate Threshold Test determines the intensity at which lactate accumulates above baseline levels. Anaerobic Capacity Tests assess maximal glycolytic energy production.
