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KIN 431 Exam 2 Questions with Complete Answers
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KIN 431 Exam 2 Questions with Complete Answers
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KIN 431 Exam 2 Questions withComplete Answers
What is heat acclimatization? - Answer-repeated exposure to heat that is sufficient to
raise internal body temperature and provoke profuse sweating
Most adaptations to heat will take place after ______ consecutive days of exposure -
Answer-5
T or F: Heat adaptations stick around for a good amount of time - Answer-False - they
are lost fairly quickly
Based on the desert study measuring rectal temperatures, how many days of exercise
in the heat did it take to elicit changes in core body temperature when exercising in the
heat? - Answer-1
- each day the subjects ended at a lower CBT
What explains the drop in core body temperature as a result of the adaptations to
repeated exercise in the heat? - Answer-Evaporation increases (we give off more heat)
= primary adaptation
- the threshold for the onset of sweating is reduced when acclimated to the heat
- we start sweating sooner, we sweat more, and we have better sweat endurance
Convection increases (we are gaining more heat) = a small price to pay in order to
sweat and lose heat through evaporation
- increased blood flow to the skin in order to feed sweat glands
What happens to sweat as an adaptation to repeated exercise in the heat? - Answer-It
becomes more dilute
- Ex. Pre-adaptation -> 120 mmol, Post-adaptation -> 100 mmol
- this means we leave more stuff behind AKA the concentration of plasma INCREASES
What is the advantage of having more dilute sweat? - Answer-We end up replenishing
our plasma with water from IC and IF fluid
- since there is now a higher concentration in the plasma, water will follow salt and
move into the plasma from the IC and IF fluid
T or F: having more dilute sweat triggers our thirst response much quicker - Answer-
True
What effect does heat acclimatization have on sodium concentration in the sweat? -
Answer-After heat acclimatization, higher sweat rates are coupled with a slower rise in
sodium concentration
- AKA there is more sodium in sweat during normal sweat rates
, How is submax HR affected by heat acclimatization? - Answer-majorly reduced
- reduced substantially over the first 5 days with a taper over the next 5
How is SV affected by heat acclimatization during submaximal exercise? - Answer-SV
becomes elevated
- since plasma volume is increasing as an adaptation from the heat, we need an
increased preload
How is cardiac output affected by heat acclimatization during submaximal exercise? -
Answer-remains the same
Which heat adaptation seems to be critical to many of the other adaptations to training
in the heat? - Answer-increases plasma volume
How does an increased plasma volume affect HR? - Answer-decreases HR
- this is why HR decreases as a result of heat acclimatization
How is increase in plasma volume accomplished? - Answer-by an increase in plasma
proteins that are synthesized by the liver
Ex. albumin
How is lactate affected by heat acclimatization during exercise in the cool and the heat?
- Answer-there is less lactate produced after heat adaptations when exercising in the
cool and the heat
Heat adaptations cause a blunted hormonal response, which leads to: - Answer-- less
catecholamine production
- less glycogen breakdown
Increased RER =
Decreased RER = - Answer-- more reliant on CHO for a fuel source
- more reliant on fats for a fuel source
Since less glycogen is being broken down in response to heat acclimatization, RER: -
Answer-decreases
- more reliant on fats as a result of heat adaptations
How does heat acclimation affect exercise performance in the heat and in normal
conditions? - Answer-exercise performance is improved in both conditions
- VO2max, time trials, and power output all improved
How long do heat adaptations last when no longer training in the heat? - Answer-2-4
weeks
How does heat acclimation affect the following variables:
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