Chapter 24

Exercise and the Environment Practice Quiz

As PO₂ decreases with increasing altitude, what causes a lower partial pressure of oxygen in the body at an increased altitude?

Check answer lower barometric pressure

When track meets are held at altitude, the sprint performances are usually better or worse than at sea level?

Check answer better

Why?

Check answer lower air density.

Why are distance-running performances generally not as good when conducted at high altitude?

Check answer lower PO2.

Why does maximal aerobic power decrease at higher altitudes?

Check answer lower PO2.

When a subject works at the same work rate at 3,000 meters altitude, the heart rate would be the same, lower or higher than at sea level.

Check answer higher.

If maximal exercise is conducted at 21,000 feet altitude, VO₂ max may be lower, higher or the same due to an actual reduction in maximal heart rate.

Check answer lower

What causes pulmonary ventilation to be higher at altitude than at sea level for any work rate.

Check answer lower air density.

What adaptive changes are seen with native populations that have resided at altitude all their lives?

Check answer they produce more red blood cells.

Some athletes experience a larger-than-expected decrease in VO₂ max when tested at altitude.  This may be due to a

Check answer larger desaturation of hemoglobin.

When Messner and Habeler climbed Mount Everest without supplemental oxygen, what did the scientists conclude about barometric pressure when they reevaluate found their calculations that VO₂ max at the top of Everest was equal to resting metabolic rate (3.5 ml • kg ^–1 • min ^–1)?

Check answer barometric pressure was higher than expected at the top of Everest.

Acclimatization to the heat results in an increase or decrease in the rate of sweating during exercise.

Check answer increase

When environmental air temperature exceeds skin temperature the sweat rate increases, decreases or stays the same?

Check answer the sweat rate increases.

In the heat stress equation the wet bulb or dry bulb temperature is given the most consideration in predicting the heat load?

Check answer wet bulb temperature

Frostbite, hypothermia or wind-chill is the term that describes the potential loss of heat due to cold air.

Check answer wind-chill

Would a thin athletic person or fat sedentary person lose heat faster when floating in cold water?

Check answer a thin athletic person

Carbon monoxide binding to hemoglobin to displace oxygen can increase or decrease VO₂ max

Check answer decrease

Chronic (e.g., two weeks) exposure to altitude will increase or decrease the unloading of oxygen from hemoglobin.

Check answer increase

What is the lactate paradox?

Check answer it refers to the decrease in production of lactate during hyperoxic conditions. For many years, physiologists have puzzled over the observation that, during maximum aerobic exercise, high-altitude natives generate lower-than-expected amounts of lactate; the higher the altitude, the lower the postexercise blood lactate peak. This paradoxical situation may be caused mainly by upregulated metabolic control contributions from cell ATP demand and ATP supply pathways.

Wind speed will or will not affect environmental temperature.

Check answer will not

Research indicates that the best way for an endurance athlete to take advantage of altitude-induced physiological adjustments is to live at _______ altitude and train at ______ altitude.

Check answer high; low

What is the term that denotes an inspired PO₂ that is greater than that at sea level is

Check answer hyperoxia

What is the most serious form of heat illnesses?

Check answer heat stroke

What pollutant is generated by the reaction of UV light and emissions from internal combustion engines?

Check answer ozone