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Prevalence of Hypertension in LSAH Participants (LSAHNEWSV9_1_1)
Research Area:
Cardiovascular physiology
Clinical medicine
Species Studied
Scientific Name: Homo sapiens Species: Human

Blood pressure is the force of the blood pushing against the walls of arteries. It is measured in millimeters of mercury (mmHg), and given in two numbers. The higher number indicates systolic pressure, which is the amount of force exerted on the walls of arteries within and leading from the heart when it contracts (i.e., during systole). The lower number is the diastolic pressure, which is the force existing between contractions (i.e., during diastole).

Normal blood pressure is usually considered to be 120/80 mmHg; measurements above 140/90 mmHg are considered to be hypertensive. Hypertension, or high blood pressure, simply refers to the increased tension or pressure in the arteries. Hypertension is a major risk factor for heart attack, heart failure, stroke, and kidney failure. Most hypertensive people have no symptoms.

For most people, there is no single known cause of high blood pressure. This type of high blood pressure is called primary or essential hypertension. Essential hypertension can't be cured, although in most cases it can be controlled. In some cases, high blood pressure can be traced to a known cause like tumors of the adrenal gland, chronic kidney disease, hormone abnormalities, use of birth control pills, or pregnancy. This is called secondary hypertension, and is usually cured if the underlying cause passes or is corrected.

The goal of this study was to examine hypertension among the astronaut and comparison populations.

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National Aeronautics and Space Administration. Prevalence of hypertension in LSAH participants. In: Longitudinal Study of Astronaut Health Newsletter. April 2000;9(1):1-3.

Blood pressure

Data Information
Data Availability
Archive is complete. All data sets are on the Web site.
Data Sets + View data.

Blood pressure
Pulse pressure

Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
LSAH 01/01/1989 05/31/2010 21 years

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Jessica Keune
Institutional Support
National Aeronautics and Space Administration (NASA)