Ultraviolet Exposure, Antioxidant Use & Skin Erythema at Extreme High

Status Completed

Clinical Trial Summary

With the increasing tourism and adventure travel into extreme environments comes the need to reassess the required protection against ultraviolet (UV) radiation and possible other oxidative stresses. This is an observational study of UV radiation exposure and skin erythema while at extreme altitude (Mt. Everest). In addition to UV exposure, skin erythema, antioxidant use (such as vitamins C and E) will be measured.

Hypothesis:

1. UV radiation at extreme altitude has larger effects on the skin than at sea level; therefore requiring an adjustment of the antioxidant use for adequate protection.

2. The skin is an accurate reflection of UV and oxidative stress exposure

3. The efficacy of oxidatives stress is reflective of the ethnicity of the individual.

Clinical Trial Description

The literature widely acknowledges the deleterious effects of UV radiation on skin health, via production of oxidative free radicals. Consequently, there have been numerous studies on the potential dermatological/anti-carcinogenic benefits of anti-oxidants, such as vitamins C and E, melatonin, green tea, zinc, and selenium. There is, however, a limited amount of literature on the quantity of UV exposure in high-risk settings, such as extreme altitude and equatorial zones. Currently, there is no literature on UV exposure on Mount Everest. Additionally, the efficacy of antioxidants (topical or systemic) has not yet been established in this environment.

This will be an observational study where the principal investigator will collect accumulated ultraviolet exposure at different extreme altitudes during a 6 week period of a summit expedition on the north side of Mt. Everest. Included in the data collection will be patient demographics, time, altitude, temperature, use of anti-oxidants, sunscreen (weighed), and skin erythema (spectophotometer). ;

Study Design

Observational Model: Ecologic or Community, Time Perspective: Prospective

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT00685438
Study type	Observational
Source	Sunnybrook Health Sciences Centre
Contact
Status	Completed
Phase	N/A
Start date	April 2007
Completion date	June 2007

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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.

Ultraviolet Exposure, Antioxidant Use and Skin Erythema at Extreme High Altitude

Clinical Trial Summary

Clinical Trial Description

Study Design

Related Conditions & MeSH terms