The purpose of the study is to assess the effect of progressive, incremental hypoxia at multiple wavelengths of light.

No additional information is required.

Inclusion Criteria:

• Is between 18 and 35 years of age
• Is American Society Anesthesiologist status 1
• Has a BMI between 18 and 30

Exclusion Criteria:

• Currently taking any medications other than birth control pills
• Has participate in an investigational drug study within one month prior to the start of the study
• Fails the Allen's Test to confirm patency of the colateral artery
• Subject is female with a positive pregnancy test, or is female and is unwilling to use effective birth control between the time of screening and study termination
• Has a positive urine continine or drug test
• Has an reported allergy to Lidocaine
• Has anemia or other hemoglobinopathy
• Has a room air saturation less than 95% by pulse oximetry
• Has an abnormal EKG
• Has an abnormal pulmonary function test via spirometry
• Is intolerant to a breathing mask apparatus
• Has a COHb greater than 3%, or MetHb greater than 2%
• Has another condition, which in the opinion of the principle investigator would not be suitable for participation in the study
• Is unwilling or unable to provide informed consent or comply with the study procedures

Healthy volunteers