regulate blood flow to active tissue maintain systemic blood pressure
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What are the two primary sources of fluid loss?
urine Sweat
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High intensity exercise produces enough heat to raise body temperature \_____ every \______ minutes. within 20 minutes it is life threatening and 40 minutes fatal
1 degree celsius 4-5
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A majority of the produced heat is transferred where via what
core, venous blood
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Greater than what % BW lost from dehydration is considered extremely dangerous?
7%+
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When the ambient temperature is higher than the skin, what are some unique sources of heat gain
Radiation convection conduction (If the skin was hotter than environment these would contribute to heat loss)
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Core temperature is about \_____ degrees celsius
37
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Slight Dehydration can
significantly decrease VO2max and overall aerobic performance
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Is thirst a reliable sign of fluid need
NO IT IS NOT
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Dehydration is defined as
percentage loss of body weight
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Signs of acclimatization
decreased HR ncreased Sweat rate
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When should heat acclimatization occur
1-2 months precomp
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most adaptations occur within
1-2 weeks
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What ambvient temperatures will be ideal for acclimatization
38.5
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Heat will move down a gradient via
radiation conduction convection
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Allcimatizstion to exercise in the heat will
increase plasma volume
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Sweat becomes \____ with acclimatization
diluted to preserve elecgtrolytes
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You start sweating earlier or later when acclimatized
earlier
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What are the two competing demands on the CVsystem during exercise
o2 and nutrient delivery
heat delivery to the periphrey for cooling
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Sweat is largely derived from
PLASMA
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What happens to venous return during exercise in the heat
increased HR to maintain cardiac output
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What happens to plasma volume during exercise in the heat