water - fluids. objectives after reading chapter 7 and class discussion, you will be able to:...
TRANSCRIPT
Objectives
After reading Chapter 7 and class discussion, you will be able to: Describe the functions of water Describe the fluid composition of
the body Describe water balance Identify sources of water and %
of water in selected foods
Objectives
Discuss symptoms of dehydration Provide recommendations for fluid
replacement Define hyponatremia Discuss fluid replace beverages
Body Water Content
@60% of body weight Brain- 75% water Blood- 85%water Skeletal muscle- 75% water Adipose- 10% water Bones- 22% water
Functions of Water Body temperature regulation
Water absorbs excess heat Body releases fluid/heat via perspiration Skin cools as perspiration evaporates
Key transportor and solvent Blood, lymphatics, urine, digestive fluids Nutrients, oxygen; removes waste
Maintain blood volume
How much??? 8x8 rule RDI’s
Adequate Intakes 15 cups men, 11 cups women
Institute of Medicine Thirst be guide
Healthcare 1 – 1.5 ml per calorie 1800 calories = 1800 -2700 ml 240 ml/cc = 1 cup
Dehydration Fluid loss greater than intake Compounds over time Risk
Athletes, GI illness, older adults, reduced calorie intake
Contributes to Poor performance, constipation,
urinary tract infections, prolonged labor
Body Conserves Fluids
Thirst signal Vasopressin (antidiuretic
hormone) Forces the kidney to reduce urine flow Alcohol inhibits
Aldosterone hormone Signals the kidney to retain sodium,
other electrolytes
Monitor Sweat Rate
Weigh before and after Goal to replace 100% What’s lost = how much to replace
National Athletic Training Association 20-24 oz of fluid per pound lost 2-3 cups per pound
Hydration Calculator http://www.beverageinstitute.org/en_US
/pages/tools-hydration-calculator.html Factors that affect…
Gender Age Exercise
Type Intensity Length of time Temperature (humidity)
Whats In Sweat?
Electrolytes Lost in Sweat
Sodium 920–1,840 mg/l
Chloride1,062–2,478
mg/l
Potassium 156–312 mg/l
Magnesium 24–96 mg/l
17
Sodium Most Important 1 pound sweat = @ 500 mg sodium Hyponatremia
Low blood sodium Symptoms
Muscle cramps, nausea Decreases thirst before adequate hydration
Causes Hydrating without sodium (plain water) Overhydration
Sports Drink Benefits
Flavor encourages greater fluid intake
Sodium Encourages fluid intake Helps retain fluids consumed
Most contain carbohydrates Energy Quick absorption