Exercise in Hot and Cold Environments — Flashcards

Flashcard 1: _____ and muscular* circulation increases during exercise.

Answer: Coronary

Flashcard 2: Exercise adaptation at high altitudes:_____ in pulmonary ventilation upon rising to a high altitude* blows off large quantities of CO2, reducing the PCO2

Answer: Increase

Flashcard 3: The mean systemic filling pressure _____ tremendously at the onset of heavy exercise.

Answer: rises

Flashcard 4: _____ circulation initially decreases but later increases during exercise

Answer: Cutaneous

Flashcard 5: Signals from _____ play a role in stimulating the respiratory drive during exercise.

Answer: joint proprioceptors

Flashcard 6: The increase in heart rate and ventilation at the onset of exercise is an example of a _____ control mechanism.

Answer: Feedforward

Extra: Feedforward (anticipatory) control allows the body to prepare for exercise before feedback from chemoreceptors or mechanoreceptors is even received. This is mediated by 'central command' from the motor cortex.

Flashcard 7: Exercise adaptation at high altitudes:To make up for the respiratory alkalosis, kidneys _____ hydrogen ion secretion and increase bicarbonate excretion.

Answer: reduce

Flashcard 8: During rest, blood flow through skeletal muscle averages _____ mL/min/100 g of muscle.

Answer: 3 to 4

Flashcard 9: Blood flow _____ to the kidneys, liver, and GIT during exercise.

Answer: decreases

Extra: During exercise, blood flow to the kidneys, liver, and gastrointestinal tract (GIT) decreases due to sympathetic-mediated vasoconstriction. In contrast, blood flow to active skeletal muscles increases significantly due to local metabolic factors (autoregulation).

Flashcard 10: McArdle index is the _____ rate

Answer: sweat

Extra: McArdle's Index is also known as the **Predicted 4-hour Sweat Rate (P4SR)**. It is an index used to assess environmental heat stress.