ALA #4

Lucia is jogging and has reached a steady state which is slightly above her lactate threshold and crossover. Which energy system is she primarily using at this point:

• 1. Anaerobic glycolysis

• 1. Lactate transition system

• 1. Oxidative

• 1. ATP-PCr

Which of the following are factors that contribute to the improvement of VO2 Max?

• Greater efficiency of oxygen utilization by the muscles

• Reduction in body fat percentage

• Increased mitochondrial biogenesis (meaning size and number increase)

• Improved oxygen delivery efficiency

Two individuals, Emily, and Alex both go for a run. This is Emily’s first run in a few months; however, Alex recreationally runs 2+ miles every day. They both run together at a 9-minute mile pace. What would you expect to occur throughout their run?

• Emily would likely be using primarily fats to generate energy for her run.

• Alex would likely be able to sustain his pace for longer than Emily can.

• Alex’s heart rate would be higher.

• Emily would experience fatigue sooner and higher lactate levels than Alex.

• Emily would burn significantly more calories than Alex.

What are likely contributors to how aerobically trained individuals can clear out lactate faster than untrained individuals?

• Trained muscles have improved lactate clearance.

• Trained muscles produce more lactate during exercise, therefore improving lactate tolerance.

• Aerobically trained individuals have higher concentrations of mitochondria, which aids in lactate metabolism.

• Enhanced capillarization and blood flow facilitates faster removal of lactate.

• Glycogen storage in trained muscles reduces lactate production.

Julie participated in a high-intensity interval training (HIIT) session. Following her workout she still finds she is breathing heavier than normal. Which of the following best describes the physiological mechanism behind this increased consumption of oxygen (EPOC)?

• This occurs due to a temporary decrease in heart rate and respiratory rate immediately after exercise.

• It is caused by a rapid increase in blood lactate levels during intense exercise

• It results from the body's efforts to replenish depleted ATP stores and restore cellular homeostasis.

• It is primarily driven by an increase in body temperature and metabolic rate during exercise.

The citric acid cycle’s primary purpose is to generate ATP.

• True

• False

An individual who participates in consistent aerobic training will have a higher crossover point and therefore utilize more fats during moderate-intensity exercises.

• True

• False