ES 380 Chapter 5: Understanding Energy Expenditure

Someone completed a 10 minute graded exercise test on a cycle ergometer to determine the highest rate of oxygen she could consume. Each stage of the test lasted 3 minutes, totaling 5 stages. During the last 30 seconds of stage 5, the exercise physiologist recorded a VO2 of 37 mL/kg/min and an RER = 1.1 which occurred at 300 watts. Which of the following is TRUE?

a. Cycling at 350 watts will likely result in a higher VO2 max

b. The test to determien her rate of maximal oxygen consumption is invalid because each stage was too short to determine steady state

c. 37 mL/kg/min is considered her VO2 peak

d. Blood lactate threshold occurred at 300 watts

c. 37 mL/kg/min is considered her VO2 peak

The Haldane transformation relies on the consistency of NH4 values as we breathe to determine the volume of inspired air. True or false?

FALSE - it is Nitrogen (N2)

Which of the following statements regarding O2 consumption during exercise is FALSE?

a. Using the absolute VO2 units, 2 athletes of greatly different body masses may have the same VO2 max

b. Males have higher VO2max in relative units (mL/kg/min) because of lower fat free mass compared to females

c. VO2 peak decreases about 10% every decade after the age of 30 but by remaining active, its reductions are lessened improving health and independence later in life

d. The delay in matching oxidative energy requirements at the beginning of any given steady state exercise is termed O2 deficit. It is proportional to exercise intensity and the deficit is met via anaerobic metabolism

b. Males have higher VO2max in relative units (mL/kg/min) because of lower fat free mass compared to females

FALSE - Males typically have a higher VO2max in relative units (mL/kg/min) than females due to their higher fat-free mass compared to females.

The use of heart rate monitoring to estimate energy expenditure is based on the assumption that heart rate reserve is _______ related to oxygen consumption reserve.

a. Exponentially

b. Inversely

c. Linearly

d. Negatively

c. Linearly

The body utilizes ___________ oxygen when metabolizing carbohydrate compared to fat.

a. Much more

b. Less

c. The same amount

d. Somewhat the same

b. Less

Which of the following scenarios would indirect calorimetry NOT yield a good measure of energy?

a. Rest

b. 10 min of high intensity interval training

c. 20 min jog keeping speed consistent

d. None of the above

b. 10 min of high intensity interval training

Why is lactate threshold an important measurement in endurance athletes who compete at longer events?

a. Signifies the transition to a greater reliance on anaerobic metabolism to fuel exercise

b. Above lactate threshold, lactate accumulates in the muscles and blood

c. Above lactate threshold, glycogen use accelerates

d. All of the above

d. All of the above

What is the term used to describe the phenomenon that occurs following exercise when oxygen uptake is greater than ATP demand?

a. Excess post-exercise oxygen insufficiency

b. Excess post-exercise oxygen consumption

c. Excess post-exercise oxygen debt

d. Oxygen deficit

b. Excess post-exercise oxygen consumption

Oxygen deficit and excess post-exercise oxygen consumption are infleunced by exercise intensity. True or false?

TRUE

Joe is a marathoner who is preparing for the Olympics. He is about to begin 4 weeks of altitude training and is curious how the altitude of Colorado (2600 m) will affect his VO2 max. He conducted a graded exercise test at UB (180 m) and upon arriving in Colorado, his VO2 max values were identical. Which of the following is the most correct about this scenario?

a. One or both of the labs did not convert from BTPS to STPD

b. The altitude of Colorado is not high enough to impair aerobic performance and VO2 max

c. The Haldane transformation for Vi and ViO2 were likely incorrectly calculated

a. One or both of the labs did not convert from BTPS to STPD