This study is a single-center prospective observational study. It plans to use a series of physiological and medical instruments and international common physiological and psychological questionnaires. To dynamically detect the changes of physiological and psychological adaptability of doctors in Peking Union Medical College Hospital before leaving Beijing, 1-7 days after arriving at the plateau in Tibet during the acute phase of plateau hypoxic stress, 2 weeks, 3 months, 6 months, 12 months after staying in Tibet during the chronic phase of plateau hypoxic stress, and after returning to Beijing.

Inclusion Criteria:

• Healthy individuals aged 20-65 years
• They can sign a written informed consent and is willing to cooperate
• They have the qualification to aid Tibet and meet the basic requirements of physical examination for aid to Tibet

Exclusion Criteria:

• Age less than 20 years or more than 65 years
• Unable to sign a written informed consent or unwilling to cooperate
• They do not have the qualification for supporting Tibet or do not meet the basic requirements of medical examination for supporting Tibet

Doctors in Tibet from Peking Union Medical College Hospital