Lecture 20 Flashcards
Exercise at Altitude
what are the stressors of a high altitude environment
- Decrease PO2 (due to decerease PB)
- Decrease Temperature (1°C/150 m)
- Decrease Humidity
- Decrease liquid Water
- Increase Wind
- Increase UV Radiation
what are the physiological effects of a high altitude environment
- Increased Ventilation
- decreased fluid & energy in
- increased Glycolysis & energy use
- decreased gut absorption
- increased catabolism
what is physiological stress at altitude mainly due to
limited PO2 diffusion gradient
how is aerobic power affected with increased altitude
non linearly
- more effect as you go to higher altitudes
why are you able to jump and throw further in higher altitude conditions
reduced air resistance
what is the degree of response to altitude generally proportional to
the level of altitude
what are the acute responses to altitude
increased heart rate and ventilation at rest and submaximal exercise
then begin to increase haematocrit as fluid is lost
what do adaptive responses to altitude also include
peripheral changes
what is variability in acute and adaptive responses to altitude not related to and what does this mean the variability is related to
not related to sex, fitness, age etc
large inter-individual variability
why is the first response of acute cardiorespiratory responses to altitude hyperventilation
due to low partial pressure of inspired oxygen
what does hyperventilation in response to altitude cause
to become more alkaline
what are the long term effects of high altitude on muscle
- increased mitochondrial density
- capillaries may become more dense
- increased aerobic enzymes
when is acute mountain sickness common
during the first several hours to days >3000m
what is acute mountain sickness directly related to
speed of ascent and final altitude
does acute mountain sickness have anything to do with genetics
partly related (cardiorespiratory control)
