Exercise in the heat Flashcards
Acclimation
changes that occur short term and brought above an environment change
Acclimatization
long-term adaptation to environmental stressor (months/years)
Exercise results in an increase in ??
heat production which disturbs thermal homeostasis
Humans are homeothermic meaning
their internal body temperature is tightly regulated
While exercising in heat, core temperature will go up or down?
Up (if it gets too high though it would be catastrophic)
Exercise in heat provides stress particularly to ??
Your cardiovascular system because blood is needed for muscles and skin (for sweating), therefore blood volume and stroke volume go down and heart rate goes up to compensate and to keep cardiac output constant
Why is stroke volume generally lower in heat?
Because we lose water from blood and body in order to sweat and heart rate increases to make up for it
Do we burn more or less glycogen in heat?
more
Exercising in heat can cause an increase in catecholamine which will encourage what?
an increase in glycogen and lactate production
Guidelines for practicing and completing in heat
- Events should not take place during hottest time of day, avoid WBGT >28 °C
- Adequate supply of palatable fluids
- Customize fluid intake based on fluid losses
(1 L sweat loss = 1 kg weight loss) - Be aware of signs of heat illness
- Organizers get final call on stopping events, excluding athletes who have heat illness
If at max sweat you can only get about ?? fluid
half - cannot keep up with rate of sweat
Wet bulb glow temperature
- Takes humidity and heat into account
- determines how much stress one will be under in a certain environment
How many days will it take for acclimation?
9-14 days - the cardiovascular system copes better (especially trained)
How long will it take for acclimatisation?
long term (months/years)
Effects of acclimation
– Cardiovascular function optimized
– Sweating rate, sweat distribution, and sweat content change
– Results in a lower core temperature during exercise
