. "Appendix C: Predictions of Daily Water and Sodium Requirements." Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate. Washington, DC: The National Academies Press, 2005.
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Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate
Excel 4.0 spreadsheet and used to generate the dataset of estimated water and sodium requirements at varying energy expenditure levels and temperatures. Environmental and individual assumptions are listed below. These data were then plotted using Sigma Plot 9.0 to generate a graphical display.
ASSUMPTIONS
Individual
70-kg person
Height = 170 cm
Walking velocity = 5 km/h
0% grade
Clothing = 1.0 (cotton)
Environmental
Partly cloudy day
Wind speed = 1 m/sec
Relative humidity = 50%
Outdoor
Water vapor pressure = 19.094 mm Hg
Load = 0 kg
Dry bulb temperature = 30°C
Black globe temperature = 45°C
Physiological
Skin body temperature = 35.0°C
Rectal body temperature = 36.5°C
Initial heart rate = 60 bpm
Rest (N)
Exposure I = 720 min (= 12 h)
Exposure II = 720 min (= 12 h)
Exposure III (min) = 0
Exposure IV (min) = 0
1.0 L/d minimal requirements for survival:
Sodium concentration of sweat (≈ 35 mmol/L), that of a partially acclimated person
