week 8 Flashcards
whats the core temp
36.5-37.5
core temp definition
temp of blood in hypothalamus in the thermoregulatory center of the body
ways to check temp thats not oral
tympanic, esophagus and rectal, stomach - telemetry pill
what is the skin temp
32 - 35
what monitors the body’s temp
thermoreceptors
what do efferent control do for the bodys temp
blood vessels dilation, glands, shivering - for too hot or too cold
voluntary muscular activity example for being too cold
shivering
what is thermogenesis?
the production of heat within animal or human body
thermogenesis is used for what
heat balance/ regulation
biophysical properties effect heat loss - name examples
convection, conduction, - water, air, wet or dry atmosphere
why don’t people sweat in humid climates
water cant leave the skin into the air due to high humidity levels
clothing effects heat loss - true or false
true
core temp needs to what
stay within a limited range
where does heat lose come from mostly
shell / skin
skin temp is regulated true or false
false
what is the most powerful response for helping control body temp
behavioral
what performance is impacted in hot and humid conditions
aerobic
what is increased in demand in hot environments
heat loss mechanisms- sweating, blood flow
in hot environment - what is reduced
the gradient between core and skin
in heat - dehydration is a problem due to fluid loss - true or false
true
heat causes a decrease in sweat rate and plasma volume because of
dehydration
cardiac output, maximal o2 uptake and muscle strength decreases or increases during heat
decreases
work capacity during heat is
decreased
hiie is impacted by heat because…
Blood flow is compromised due to muscle and thermoregulation between muscle and skin
heat related changes in skeletal muscle function and metabolism causes
hiie to be impaired
impacts of the heat on you - warning signs
thrist, lots of sweating, fatigue, headache, nausea, chills or goosebumps, faitness
heat illness signs
heat cramps, heat exhuastion, heat stroke, confusion, hot and dry skin, rapid pulse.
how should athletes prepare for training in heat
train in heat - aerobic specifically and immediately post - pre-cooling - improving hydration status
examples of acclimatization’s…(8)
improved blood flow, lower threshold for sweating, more effective distribution of sweat, less salt conc of sweat, lower skin core temps , less reliance on cho catabolism
the effect of blood flow on body
transports heat from deep tissue
the effect of more effective cardiac output
circulation to skin and muscles to meet demands and better bp stability during exercise
effect of lower sweat threshold
evaporative cooling
effect lower salt in sweat
preserving electrolytes
effects of lower core and skin temo and hr
allows for blood flow to muscles
effects of less reliance on cho
spare cho
cold stress is what temp for the core
below 35 or 95 F
2 degree drop in cold will cause what
associated with maximal shivering
4 degree drop in core temp will cause what
ataxia and apathy
6 temp core drop will cause
unconscious
what occurs over 6 degree drop in temp
ventricular fib, reduced brain flow, asystole and death
responses to cold during exercise - physiological - not shivering and blood flow
increased submaximal vo2 and capacity in water - due to heat loss, increased lactate, lower hr, release of leptin from adipose, lower lipid mobilisation,
cold - why is there a lower lipid mobilization
reduced blood to adipocytes
what causes decreased hr during submaximal exercise in cold
increased central blood volume for heating core
why increased blood volume in the core in cold
peripheral vascocontriction
why the release of leptin during cold from adipose
increased sympathetic stimulation
effects of increased lactate concentration
due to increased cho metabolism
exercise in cold environment results in what
shivering threshold is lowred due to heat production and improved peripheral blood flow to hands and feet and sleep in cold
