Dehydration
According to http://www.prweb.com/releases/2010/03/prweb3745384.htm, 80% of Americans have chronic dehydration. Dehydration is a medical condition in which the body contains less fluids than it normally should. Dehydration can cause fainting, dizziness, sleepiness, and in some extreme cases, death. There are different ways to categorize dehydration. The definition that we are using is loss of electrolytes through the sweat (hypotonic).
Circuit
There are two main circuits that we can use. The first circuit has been taken from the website http://www.element14.com/community/groups/pumping-station-one/blog/2011/05/08/ouch-sensing-galvanic-skin-response-gsr.
The LED can be taken out and replaced with connection to the computer through the Data Acquisition.
The second circuit makes use of a Wheatstone Bridge Circuit. In this circuit, there are three known resistor values and one unknown resistor. Through the use of Ohm's Law (V=IR) the relationship between the known resistor and unknown resistors can be found, and therefore the unknown resistance can be determined.
We used the Wheatstone Bridge Circuit depicted in https://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2006/hmm32_pjw32/index.html.
Projected Values for Conductivity
Projected values for conductivity during dehydration were calculated using standard starting sodium in sweat concentration. For 65 kg athlete, the starting condition for sodium sweat concentration is 40 mM (millimoles per Liter), according to the mathematical model proposed by Dr. Jonathan Toker on the following site: http://www.slowtwitch.com/Training/General_Physiology/The_Math_of_salt_loss_1093.html
The mathematical model proposed that a difference of 10mM from the average healthy starting point for sweat concentration points to the onset of dehydration.
It was proposed that at greater than or equal to 50 mM of sodium in sweat, dehydration will begin to occur. This value was converted into g/m^3 and cross referenced with the chart below through slope analysis.
Therefore, anything greater than or equal to 6.43 microsiemens is a sign of dehydration.
The mathematical model proposed that a difference of 10mM from the average healthy starting point for sweat concentration points to the onset of dehydration.
It was proposed that at greater than or equal to 50 mM of sodium in sweat, dehydration will begin to occur. This value was converted into g/m^3 and cross referenced with the chart below through slope analysis.
Calculation
Therefore, anything greater than or equal to 6.43 microsiemens is a sign of dehydration.
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