KHP 420G final exam Questions with Complete Correct Answers | Grade A+

Metabolic response to incremental exercise Ans: -no further increase in VO2 with increasing work rate VO2 Max Ans: -affected by genetics and training -physiological ceiling for delivery of O2 to muscle Physiological factors influencing VO2 max Ans: -maximum ability of cardiorespiratory system to deliver oxygen to the muscle -ability of muscles to use oxygen and produce ATP aerobically Lactate Threshold (LT) Ans: point at which blood lactic acid rises systematically during incremental exercise where does the lactate threshold occur? 2 Ans: about 50-60% VO2 max in untrained subjects -65-80% VO2 Max in trained subjects Explanations for lactate threshold Ans: 1. low muscle oxygen 2. accelerated glycolysis 3. recruitment of fast twitch muscle fibers 4. reduced rate of lactate removal from the blood factors influencing fuel selection during exercise Ans: nutritional intake, intensity and duration of the exercise, endurance training status of the individual what does low intensity exercise primarily rely on Ans: fat primary source of energy during high intensity exercise Ans: carbohydrates when is there a progressive increase in the amount of fat oxidized by the working muscle 3 Ans: low intensity prolonged exercise low intensity exercise Ans: 30 %VO2 max -fats are the primary fuel high intensity exercise 70% VO2 max Ans: carbohydrates are primary fuel crossover concept Ans: shift from fat to CHO metabolism as exercise intensity increases what causes the crossover concept Ans: recruitment of fast muscle fibers and increasing blood levels of epinepherine glycogen breakdown during exercise Ans: -dependent on the phosphorylase -activation of phosphorylase activation of phosphorylas