L17, Exercise in the Heat 1

Question 1

Warm muscles produce more power and increase 2-3 degrees in endurance and resistance exercise, but, hot muscles can produce less force and fatigue faster due to?

Answer 1

Increase in glycogenolysis.

Question 2

Muscle temperature depends on?

Answer 2

Time, intensity, clothing, temperature of ambience.

Question 3

What temperature is optimal at rest?

Answer 3

26 degrees for air, 34 degrees for water.

Question 4

What determines the body’s temperature in exercise?

Answer 4

Sensed by receptors in the skin, spinal cord, and hypothalamus –> Integrated in the hypothalamus –> Increases sweat and blood flow.

Question 5

What is the formula for heat production rate?

Answer 5

Metabolic rate - Work rate

Question 6

Heat production and the increase in core temperature are directly related to what?

Answer 6

Work rate

Question 7

Exercise causes an increase in muscle blood flow, why is an increase in skin blood flow and sweating needed?

Answer 7

To offload heat to prevent hyperthermia (arterial pressure and blood supply to other tissues also needs to be maintained).