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Evaluation of the Ergometer Vibration Isolation System (DTO 658)
Research Area:
Cardiovascular physiology
Muscle physiology
Species Studied
Scientific Name: Homo sapiens Species: Human

Exercise is a flight requirement for maintaining crew health on Shuttle missions lasting more than five days. For the Space Station and other long-duration missions in zero or partial gravity environments, exercise is anticipated to be a major factor in health maintenance and in readapting to a one or partial gravity. The traditional exercise device on the Space Shuttle has been the treadmill which is known to produce significant vibration levels throughout the Crew Compartment and Spacelab Module (SLM). The Extended Duration Orbiter Cycle Ergometer was developed as an exercise countermeasure device for providing aerobic exercise while reducing the level of vibration imparted to the Orbiter.

The Ergometer Vibration Isolation System (EVIS) was developed to isolate the vibration caused by cycle ergometer exercise. The EVIS employed isolators at four corners of a special one-piece cycle ergometer mounting frame to inhibit transfer of forces to the spacecraft structure, and four active "throw-mass"-type stabilizers which counteract the forces induced by exercise and stabilize the ergometer. The stabilizers had linear motors to drive the throw masses. Accelerometers and sophisticated control feedback circuitry were used to detect the forces and control the motion of the stabilizers. This study had the following specific aims:

  1. Identify the magnitude and frequency of the vibration generated by the cycle ergometer with the isolation system on specific areas of the Spacelab module and middeck area of the Orbiter.
  2. Evaluate the ease of set up and stowage of the EVIS.
  3. Evaluate the impact of the EVIS on the performance of exercise activities.
  4. Evaluate the impact of the EVIS on crew activities in the middeck area.

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Greenisen MC, Hayes JC, Siconolfi SF, Moore AD. Functional performance evaluation. In: Sawin CF, Taylor GR, Smith WL, editors. Extended Duration Orbiter Medical Project final report 1989-1995. Houston: NASA Johnson Space Center, 1999.


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Data Information
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Vibration frequency
Vibration magnitude

Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
STS-50 06/25/1992 07/09/1992 14 days

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Pamela A. Bieri
Institutional Support
National Aeronautics and Space Administration (NASA)