Exercise In The Heat Flashcards
(22 cards)
Which of the following best describes the timeline for cardiovascular and thermoregulatory adaptations during heat acclimation?
Up to 75% of cardiovascular and thermoregulatory adaptations can take place within the first 5 days of heat acclimation
Which of the following best represents the normal core temperature range in a healthy adult at rest?
36.1 – 37.5°C
Which of the following best describes the duration and maintenance of heat acclimation (HA)?
Adaptations can last for 2-3 weeks after medium-term heat acclimation
Which of the following is the primary method of heat loss at rest in a cool environment?
Radiation
Which of the following heat acclimation adaptations most directly support improved exercise performance in hot conditions?
Earlier sweat onset, greater sweat volume, and more dilute sweat, which improves heat dissipation and maintains electrolyte balance
How does the preoptic-anterior hypothalamus regulate body temperature?
It receives input from both thermal receptors in the skin and direct detection of blood temperature changes
Which of the following best describes the key recommendations for achieving effective heat acclimation?
Fill in the blanks:
“Elevate core temperature to ______ for ______ to induce effective heat acclimation.”
38.5°C, 60 minutes
Which of the following statements best describes the effects of dehydration and sweat loss during exercise?
Dehydration reduces sweat rate and skin blood flow, impairing heat dissipation, increasing heat storage, and putting strain on the cardiovascular system
How does exercising in a hot environment affect blood flow distribution, and what are the consequences for cardiovascular function?
More cardiac output is redirected to the skin for heat dissipation, reducing muscle perfusion and contributing to decreased maximal aerobic capacity.
Which of the following is a recognised heat acclimation adaptation?
Decreased rating of perceived exertion
Which of the following is an example of an internal pre-cooling strategy?
Cold water ingestion
Which environmental parameters are included in the Wet Bulb Globe Temperature (WBGT) index, an index of heat stress?
Dry bulb temperature (DBT), Wet bulb temperature (WBT), and Globe temperature (GT)
Exercise or rest to attain and maintain a given core temperature (e.g. 38.5°C) best describes which methodology for inducing heat acclimation?
Controlled hyperthermia
How does environmental heat affect running performance across different race distances?
Short-distance sprints (100m, 200m) may benefit from hotter conditions, while longer endurance events (5,000m, 10,000m, marathon) are more likely to suffer.
Which of the following is the best strategy for maintaining heat acclimation (HA) without disrupting the tapering process before competition?
Acclimating in advance and “topping up” with intermittent sessions before the event
Which of the following is an example of passive heat exposure?
Water immersion
During exercise, [_______]% of metabolic energy is used for mechanical work, with the remainder released as heat, significantly [_______] body core temperature
20-25 increasing
During exercise in a hot environment, which of the following best describes the body’s thermoregulatory response to an increase in core temperature?
Peripheral vasodilation and increased sweating occur, but excessive fluid loss reduces plasma volume, potentially impairing heat dissipation.
Which of the following best describes the role of evaporation in heat dissipation during exercise in varying ambient temperatures?
Evaporation is the major defense against overheating, especially when ambient temperature surpasses skin temperature, and sweating rate increases proportionally
Which of the following statements best categorizes heat acclimation and its effectiveness?
Medium-term heat acclimation (MTHA: 6–10 days) is generally sufficient for females to achieve optimal physiological adaptations
Why is radiation less effective for heat loss on a hot, sunny day?
The surrounding environment is also hot, reducing the temperature gradient
Which of the following statements best explains the effect of relative humidity on evaporative heat loss during exercise?
High relative humidity reduces the effectiveness of sweat evaporation because the moisture gradient between the skin surface and the air is low
