This study intends to further reveal the effectiveness of intermittent hypoxia in preventing acute hypoxic injury.
Acute exposure to hypoxia can induce acute hypoxic injury (AHI), according to the severity of the injury, it can be divided into acute mountain sickness (AMS), high altitude pulmonary edema (HAPE) and high altitude cerebral edema (HACE). AMS is the most common type, it mostly occurs within 6-12 hours after rapidly entering the altitude above 2500m, sometimes within 1h, and can be manifested as headache, nausea, diarrhea, sleep disorders, etc. The incidence of AMS at the altitude of 2500-3000m is 10-20%, which reaches 50-85% at 4500-5000m above sea level. Intermittent hypoxia (IH) refers to periodic hypoxic-normoxic training performed with brief exposure to hypoxia. Previous studies have found that short-term intermittent hypoxia can increase the sensitivity of hypoxia and reduce the severity of acute hypoxia injury, and alleviate acute hypoxia injury by reducing the inflammatory response caused by hypoxia. Therefore, this study aims to conduct a randomized controlled trial to further reveal the effectiveness of IH and explore its potential mechanisms.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
DOUBLE
Enrollment
100
The intermittent hypoxia protocol refers to four cycles of 10 minutes hypoxia inhaling interval by 5 minutes normoxia, which is performed twice a day (at least 6 hours apart) in 5 days.
The sham intermittent hypoxia protocol refers to 55 minutes normoxia inhaling, which is performed twice a day (at least 6 hours apart) in 5 days.
Xuanwu Hospital, Capital Medical University
Beijing, China
RECRUITINGIncidence of acute mountain sickness between IH group and control group
A questionnaire called 2018 Lake Louise Scoring System (LLSS) score \[0-12\] will be used in this primary outcome assessment. The higher LLS scores mean the worse symptoms of acute mountain sickness (AMS).
Time frame: After the 6-hour acute hypoxia exposuring.
Concentration of serum parameters between IH group and control group
Time frame: After the 6-hour acute hypoxia exposuring.
Incidence of intracranial hypertension between IH group and control group
A noninvasive cranial pressure detector will be used to monitor the intracranial pressure.
Time frame: After the 6-hour acute hypoxia exposuring.
Incidence of decreased reaction and executive ability between IH group and control group
Related questionnaires will be used to assess the relevant cognitive domain.
Time frame: After the 6-hour acute hypoxia exposuring.
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