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Exercise Physiology Exam 3 > EX Phys Exam 3 > Flashcards

EX Phys Exam 3 Flashcards

1
Q

inability to dissipate excess heat

A

Heat Stress

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2
Q

ability of body to maintain constant internal temperature

A

Thermoregulation

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3
Q

Receptors in periphery & CNS detect

A

Temperature changes

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4
Q

acts like thermostat

A

Hypothalamus

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5
Q

Factors determining thermoregulatory stress

A

Ambient temperature
Relative humidity
Wind speed

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6
Q

Relative humidity

A

% of water vapor held in air

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7
Q

Plays a major role in heat loss
Affects our perception of thermal stress
When high (regardless of temperature, limits evaporation)

A

Humidity

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8
Q

Mechanisms of Heat Loss

A

Convection
Conduction
Radiation
Evaporation

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9
Q

Convection:

A

Air blows over surface of skin

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10
Q

Conduction

A

Physical contact between 3 surfaces

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11
Q

Radiation

A

Molecules in motion emit electromagnetic waves

-Infrared rays

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12
Q

Evaporation

A

Water on skin turns to vapor

- Heat loss due to fluid evaporation

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13
Q

As body temp rises sweat production_____

A

increases

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14
Q

Sweat reaches _________ and _________

A

skin and evaporates

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15
Q

Evaporation accounts for ______% of heat loss during exercise, but only ________% at rest.

A

80% during exercise

20% at rest

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16
Q

Insensible water loss removes _____% with sweat

A

10%

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17
Q

In heat stress, increase ______ and ______

A

Heart rate and cardiac output

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18
Q

Redirects circulatory flow to periphery:

A

dissipate heat

cool blood

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19
Q

Circulatory and Metabolic responses to heat stress:
body temp _________
oxygen uptake ______
Muscle lactate levels _______

A

Increases
increases
increases

20
Q

With heat stress sweating ______

A

Increases

21
Q

High volumes of sweet causes:
Blood volume to _________
____ of electrolytes
Release of _____ and ________

A

Decreases
Loss
Aldosterone and ADH

22
Q

Larger the body mass the greater ________

A

heat production

23
Q

Body fat insulates making heat loss _________

A

difficult

24
Q

Greater the fitness, the greater _________

A

Cardiac output

25
Q

Greater cardiac output improves ability to ______ heat.

A

dissipate

26
Q

Muscle cramps occur when one is exposed to ______

A

heat

27
Q

Heat cramps result from :

A

Dehydration
Electrolyte imbalances
Whole body sodium deficit
Nueromuscular fatigue

28
Q

Heat cramps are triggered by intense _______

A

exercise

29
Q

Caused by failure to dissipate heat after intense exercise

A

Exertional Heat Stroke

30
Q

In exertional heat stroke core temp is elevates to > ____

A

104 F

31
Q

As heat increases, performance endurance _________

A

decreases

32
Q

Measures to ensure optimal performance (3)

A

Prior acclimation
proper hydration
proper conditioning

33
Q

Anaerobic and strength performance in heat depends on duration of ________ and duration of ________ exposure.

A

event

heat

34
Q

Longer events are ______ likely to affect performance

A

more

35
Q

Anaerobic and strength performance in heat stress can be improved by: (3)

A

Cooling methods
hydration
limit time of exposure in heat

36
Q

Physiological adaptation to an artificial environment

A

acclimation

37
Q

Physiological adaptation to a natural environment

A

acclimatization

38
Q

Time course of adaptations:

  • Cardiovascular: _ to _ days
  • Temperature regulation: _ to _ days
  • Conservation of Na: _ to _ days
  • All Adaptations: up to _ days
A

Cardiovascular: 1-5 days
Temperature reg: 5-8 days
Conservation of Na: 3-9 days
All adaptations: up to 14 days

39
Q

Absence of exposure, adaptations lost in ___ to ___ weeks

A

2.5 to 5 weeks

40
Q

Adaptation occurring in Acclimation and Acclimatization:

- _______ core temperature at onset of sweating

A

Lower

41
Q

Adaptation occurring in Acclimation and Acclimatization:

- _______ heat loss via radiation and concoction

A

Increase

42
Q

Adaptation occurring in Acclimation and Acclimatization:

- _______ blood plasma

A

Increase

43
Q

Adaptation occurring in Acclimation and Acclimatization:

- ________ HR at specific workload.

A

Decrease

44
Q

Adaptation occurring in Acclimation and Acclimatization:

- ________ body-core temperature.

A

Decrease

45
Q

Adaptation occurring in Acclimation and Acclimatization:

- ________ O2 consumption at given workload.

A

Decrease

46
Q

Adaptation occurring in Acclimation and Acclimatization:

- _______ exercise economy.

A

Improved

47
Q

Sweating cools the body, but it _________ it.

A

Dehydrates

Exercise Physiology Exam 3 (1 decks)

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