Non-Invasive Optical Spectroscopic Methods for Dehydration Identification in Marathon Trainees

The research can use low power laser technology to take measurements of muscle tissue water
content in volunteers before and after marathon training runs to detect dehydration. Two
slightly different devices can be used to detect dehydration. 1). diffuse optical
spectroscopy and 2). spatial frequency domain imaging-modulated imaging The researchers can
determined by use other methods to assess the level of dehydration status in runners. These
methods will include taking weight and temperature before and after run, skin-fold
measurements pre and post run, and obtaining saliva samples from before and after run. The
researchers can determine the study use non-invasive, laser light technology measure tissue
water concentrations, as an indicator of dehydration.

Inclusion Criteria:

- male female ages of 18 and 60

- training for a marathon

Exclusion Criteria:

1. Poorly controlled diabetes mellitus

2. Diabetes insipidus (excessive urination of water) as diagnosed by your physician

3. disorder of the intestine

4. Irritable bowel syndrome with excessive diarrhea, as diagnosed by a physician

5. Congestive heart failure and subsequent use of a diuretic "water pill" to remove
excess water from the body

6. Have poor kidney function

7. Have been diagnosed with hyperthyroidism/hypothyroidism by your physician