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Flashcards in Water Requirements & Fluid Balance Deck (32):
0

Dehydration

Reduction in body water content

1

Wet bulb globe temperature

Comprehensive index of environmental heat stress

2

Radiation

Transfer of heat by emission from one object to another

3

Hypothalamus

The central thermal controller or "thermostat" of the body

4

Euhydration

Normal state of body water

5

Reactive oxygen species's

Can cause damage to cellular membranes making them leaky

6

Endotoxins

Bacterial toxins from gut that can be released into circulation

7

Convection

Exchange of heat between a solid object and one that moves

8

Hyperthermia

Potentially dangerous rise in body temperature

9

Heat syncope

Loss of consciousness related to heat injury

10

True or false?
Water accounts for 50% – 60% of total body mass with adipose tissue containing more water by mass then lean body tissues?

False

11

Water loss occurs through?
4

1) respiration
2) skin – evaporation of sweat
3) feces
4) urine

12

Water gain occurs through:
3

1) ingestion of fluids
2) ingestion of food
3) metabolic breakdown of macronutrients

13

_________ generally begins when body temperature reaches 39.5°C (103°F)

Central (Brain) fatigue

14

List four factors that directly dictate environmental heat stress

A) ambient temperature
B) relative humidity
C) Wind velocity
D) Solar radiation

15

True or false?
Body heat transferred into a relatively cool bench used to rest on during interval sprints is an example of conduction.

True

16

High ambient temperature in high humidity = high risk for _________ & ________

Dehydration and hyperthermia

17

A wetbulb globes temperature (WBGT) is derived from a special device containing multiple thermometers that measures what specific components of heat stress?

A) humidity
B).radiation
C) ambient temperature

18

The hypothalamus, or thermostat of the body, can stimulate ________ and the initiation of ______ to allow for optimal dissipation of heat

Cutaneous dilation, sweating

19

List five physiological effects that occurred during dehydration that have an adverse effect on exercise performance

A) reduction of blood volume
B) decreased skin blood flow
C) decreased heat dissipation
D) increased core temperature
E) increased rate of muscle glycogen use

20

True or false?
Reliance on thirst as the signal to drink is not optimal as a degree of hydration sufficient to impair performance can occur before the desire for fluid intake is evident

True

21

Environmental heat stress is dictated by each of the following except?

A) ambient temperature
B) core radiation
C) relative humidity
D) Wind velocity

B) Core radiation

22

Which of the following modes of potential heat loss is severely limited when training in a humid environment?

A) radiation
B) conduction
C) convection
D) evaporation

D) evaporation

23

How much water can a fit Ashley potentially lose each hour in the form of sweat when engaging in strenuous training in the hot environment?

A) 0.5 L/hour
B) 1.0 L/hour
C) 1.5–2.0 L/hour
D) 2.0–3.0 L/hour

D) 2.0–3.0 L/hour

24

Which of the following is not a physiological adaptation that occurs as an athlete acclimates to training in the heat?

A) blood volume increases
B) in earlier onset of sweating
C) an increase in the number of sweat glands
D) an increase in the capacity for blood flow to the skin

C) an increase in the number of sweat glands

25

Water loss of 5% of total body weight can decrease the capacity for work by what percentage?

A) 10%
B) 20%
C) 30%
D) 40%

C) 30%

26

Which of the following issues is related to heat syncope?

A) endotoxemia
B) enhanced heat dissipation
C) Hyperhydration
D) Low electrolytes

A) endotoxemia

27

Which of the following is not considered a risk factor for heat injury/illness?

A) obesity
B) excessive sleep (>10hrs)
C) Low physical fitness
D) lack of acclimatization

B) excessive sleep (>10hrs)

28

Which of the following supplements me enhance fluid retention during hyperhydration?

A) caffeine
B) glutamine
C) glycerol
D) lactose

C) glyceryl

29

Which of the following is not an optimal attribute of fluid consumption during prolonged events (>1hour)

A) The fluid should be cooler than the ambient temperature
B) fluid should be ingested at a rate of 600–1200 ML/hour
C) The fluid should contain sodium
D) The fluid should be hypertonic with respect to blood plasma

D) The fluid should be hypertonic with respect to blood plasma

30

Which of the following describes the optimal intake of fluids to allow hyperhydration prior to prolonged competitive event in the heat?

The athlete should consume:
A) 1–2 ML of fluid per kilogram of BW about 2 hours prior to the event
B) 3–5 ML of fluid per kilogram of BW about 1 hour prior to the event
C) 6-8 ML of fluid per kilogram of body weight about 2 hours prior to the event
D) 8–10 ML of fluid per kilogram of body weight about 3 hours prior to the event

C) 6-8 ML of fluid per kilogram of body weight about 2 hours prior to the event

31

Hydration

Relates to the balance between water intake and water loss