23 Questions
What is the term used to describe the period after aerobic exercise where oxygen uptake remains elevated above resting levels?
Excess Post-exercise Oxygen Consumption (EPOC)
During the initial stages of exercise, the increase in oxygen uptake tends to lag behind energy expenditure primarily due to:
Anaerobic glycolysis
What is the main role of oxygen in energy-transfer reactions during exercise?
To serve as an electron acceptor and combine with H+ generated in metabolic pathways
What does the term 'Oxygen deficit' refer to in the context of exercise physiology?
The delayed increase in oxygen uptake at the onset of exercise
What is the primary method to continually replenish ATP during exercise at steady-state?
Glycolysis
Which component of EPOC is believed to represent the rebuilding of ATP and PCr used during initial stages of exercise?
Fast component
What happens when high energy phosphates (PCr) are depleted during exercise?
Lactic acid starts to increase in the exercising muscle
Why is the estimation of anaerobic activity based on post-exercise oxygen consumption considered too simplistic?
Oxygen consumption does not directly reflect anaerobic activity
During strenuous exercise, what happens to the rate of hydrogen production joined to NADH?
Exceeds the rate that can be processed through the respiratory chain
What enzyme catalyzes the formation of lactic acid from pyruvate?
Lactate dehydrogenase (LDH)
In which event lasting 1-3 minutes is the anaerobic glycolysis pathway the primary metabolic pathway?
Sprinting
What process uses lactate formed during strenuous exercise for the synthesis of glucose?
Cori Cycle
What is the relationship between recruitment of type II muscle fibers and lactate formation during exercise?
Recruitment of type II fibers promotes the formation of lactate.
How is the lactate threshold typically expressed?
In terms of VO2max percentage.
What is a notable characteristic regarding the accumulation of lactate during exercise?
Lactate accumulates before reaching the lactate threshold.
What is the primary indicator of potential for endurance exercise?
Lactate threshold
Why does higher lactate threshold predict better endurance performance for athletes with the same maximal oxygen uptake?
Increased lactate production rate
What is the main role of lactate formed in hardworking muscle during exercise?
Be converted to pyruvate
In the context of exercising muscle fibers, what prevents the reversal of lactate formation to pyruvate?
NAD+ shortage
What occurs when there is speculation that LDH activity in type II muscles favors conversion of pyruvic acid to lactic acid?
Decreased accumulation of lactate in tissues
How does the production of lactic acid match its removal under aerobic conditions?
Through a process known as turnover
What effect does tissue hypoxia during heavy exercise have on lactate accumulation?
Enhances the accumulation of lactate in tissues
Why does the accumulation of lactate in tissues occur during higher intensity activities?
Excessive production exceeding removal rate
Learn about the Oxygen Deficit and Excess Post-exercise Oxygen Consumption (EPOC) phenomenon, how oxygen uptake increases during aerobic activity, and its relationship with exercise intensity. Understand the concept of reaching a plateau in oxygen uptake and its implications for exercise duration.
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