More material related to ch 25 Exercise and thermal stress

dry heat loss

another name for convective cooling is ___ ___ ___

low

At ( high / low ) air temperatures, convective cooling (dry heat loss) is really effective and maintains core temperature with minimal sweating and evaporative cooling

high

evaporative heat loss is more effective at ___ temperatures

dec

aerobic training ____ sweat NaCl concentration

inc

fluid replacement ____ work time in the heat

inc

heat acclimation ____ performance

slow

A few weeks of aerobic training under hot conditions leads to adaptations that ____ the rise of core temperature and HR during exercise. 

lower, inc

One key adaptation of heat acclimation is that sweating starts at a ____ core temperature, and sweat volume _____

doesn’t, less

Within a few weeks of heat acclimation, core temperature ( does / doesn’t ) increase as much during exercise and there’s ( more / less ) heart rate drift. 

3

A loss of body fluid of ___ % (dehydration) is sufficient to impair aerobic exercise performance

plasma, erythrocyte

Aerobic training INC increases ____ volume. 

• An increase in _____ (red blood cell) volume occurs over a slower time course.

total body water, intracellular fluid, plasma volume, red blood cell volume, blood volume

Aerobically-trained subjects have higher

• ___ (TBW), ___ (ICF), ___ (PV), ___ (RCV), and total ___ (BV).

low

Sweat rates are pretty ____ for athletes in water

inc, less, less, inc

After heat acclimation ( 5 - 10 days of training):

• sweat volume is ____

• there’s ____urinary water loss

• there’s ____loss of electrolytes

• and blood volume is ____.

skin

When it’s hot, a huge portion of cardiac output ( C.O) is diverted to the ___

• That really impairs aerobic performance, because there’s LESS blood flow to working muscle.

B

Compared to exercise under temperate conditions, during exercise in hot conditions, blood flow to the skin is: A. lower B. higher C. about the same

A

Compared to exercise under temperate conditions, during exercise in hot conditions, Maximal aerobic work rate is: A. lower B. higher C. about the same

VO2, dec

When it’s really chilly, a bit of shivering takes a portion of VO2, which ( inc / dec ) aerobic performance.

lower, heart rate drift, heat acclimated

Training results in ( higher / lower ) core temperature and ___ ____ ___during sustained aerobic exercise.

• The results are better for those who are ___ ___

narrow

People with ___ body sizes tend to do better in aerobic events in heat

lower

people who are heat acclimated start sweating at a ___ body temperature than those who are trained/untrained