P409 Exercise @ Altitude (In-Focus & In-Review)

Front 1

In-Focus

Back 1

Air temperature deceases at altitude increases

Temperature decrease is accompanied by a decrease in the water vapor pressure in the air resulting in dryer air--->

Dehydration can occur through:
-increased respiratory water loss

-increased sweet evaporation

Front 2

In-review

Back 2

Altitude presents a hypobaric environment;

1,500m(4,921ft) or more have a notable physiological impact on exercise performance

Front 3

In-review

Back 3

Percentages of gases stay the same with altitude only partial pressures of each gas decrease with decreased barometric pressure at higher altitudes

Front 4

In-review

Back 4

Solar radiation is more intense at higher elevations

the effect is magnified when ground is snow covered

Front 5

In-Focus

Back 5

One ventilates greater volumes of air at altitude because PO2 is decreased, stimulating peripheral chemoreceptors

This increased depth and rate of breathing helps offset even larger decreases in PO2 in the body

Front 6

In-review

Back 6

Altitude causes hypobaric hypoxia, resulting in decreased partial pressures of oxygen throughout the body

Front 7

In-review

Back 7

acute exposure to altitude causes a series of adaptations to occur:

pulmonary ventilation increases

Oxygen transport is slightly impaired because hemoglobin saturation at altitude is reduced

Front 8

In-review

Back 8

Oxygen uptake by muscles in impaired at altitude due to the diffusion gradient between blood and active tissues

Front 9

In-review

Back 9

Upon initial ascent to altitude the body increases cardiac output during submaximal work to compensate for the decrease in oxygen content per L of blood by:

increasing heart rate cause stroke volume falls with the fall in plasma volume

Front 10

In-review

Back 10

altitude increases metabolic rate by increasing sympathetic nervous system activity

Increased reliance on carbs for fuel, both at rest and during submaximal exercise