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VO2 Max and Endurance Performance
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| Class, please work through theses answers and check your work below. Is VO2Max the best predictor of endurance performance? Do marathoners run at 100% VO2max? Compare the following two athletes: Athlete1: VO2max = 70ml/kg/min and trains at 70% of max: Performance VO2 =49 ml/kg/min Athlete2: VO2max = 61ml/kg/min and trains at 80% of max: Performance VO2 =49 ml/kg/min What are your observations? What is the role of VO2max in endurance performance? What other factors impact endurance performance? What is the lactate threshold? What is maximal lactate steady state (MLSS)? How do we measure lactate threshold (LT) and identify it? How do we measure MLSS? In a trained endurance athlete, can an exercise intensity at the LT and MLSS be maintained almost indefinitely? What does an exercise intensity above the MLSS mean? Can you improve the LT and if so, HOW? What is the ventilator threshold(s)? Ventilatory threshold 1 (VT1) refers to what? Ventilatory threshold 2 (VT2) refers to what? CLASS, LAST TO COVER ARE SOME POINTS ON ECONOMY AND EFFICIENCY IN LECTURE. What is a definition for economy/efficiency? |
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| Is VO2Max the best predictor of endurance performance? No, VO2max is not the best predictor of endurance performance. Do marathoners run at 100% VO2max? No Compare the following two athletes: Athlete1: VO2max = 70ml/kg/min and trains at 70% of max: Performance VO2 =49 ml/kg/min Athlete2: VO2max = 61ml/kg/min and trains at 80% of max: Performance VO2 =49 ml/kg/min What are your observations: Athlete2 has a HIGHER (80%) oxygen utilization referred to as FRACTIONAL Utilization of VO2max What is the role of VO2max in endurance performance? VO2max sets the upper limit for energy production in prolonged work. What other factors impact endurance performance? Lactate threshold, ventilatory threshold, economy?efficiency. What is the lactate threshold? It is the exercise intensity that coincides with an abrupt increase in muscle or blood lactate accumulation. What is maximal lactate steady state (MLSS)? MLSS is the highest lactate concentration and workload that can be maintain without continual blood lactate accumulation during steady state exercise. How do we measure lactate threshold (LT) and identify it? During each stage of a VO2max test. A blood lactate increase greater than 1 mmol/L between stages equals the LT. How do we measure MLSS? This is measured in a long protocol with 5-25min stages (or longer). In a trained endurance athlete, can an exercise intensity at the LT and MLSS be maintained almost indefinitely? YES, for 30-60min What does an exercise intensity above the MLSS mean? There will be a greater contribution of anaerobic metabolism. Can you improve the LT and if so, HOW? Yes, by training at or above the LT. What is the ventilator threshold(s)? It is an indirect measure of lactate appearance and the MLSS Ventilatory threshold 1 (VT1) refers to what? The 1st lactate threshold, which is about 40-60% of VO2max. It is an increase in ventilatory drive due to excess CO2 production. It is an aerobic threshold that corresponds with the 1st LT Ventilatory threshold 2 (VT2) refers to what? The 2nd lactate threshold, which is about 60-90% of VO2max. With VT2, ventilation increases out of proportion of CO2 production (called the respiratory compensation point). VT2 is an anaerobic threshold that corresponds with MLSS or the 2nd lactate threshold. CLASS, LAST TO COVER ARE SOME POINTS ON ECONOMY AND EFFICIENCY IN LECTURE What is a definition for economy/efficiency? The energy demand for a given velocity of submaximal exercise. |
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