Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS) System (CEVIS) - 12.05.18

Summary | Overview | Operations | Results | Publications | Imagery

ISS Science for Everyone

Science Objectives for Everyone
The Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS) system provides aerobic and cardiovascular conditioning through recumbent (leaning back position) or upright cycling activities. CEVIS has the capability to support International Space Station (ISS) science activities, pre-breathe extravehicular activities (EVA), periodic fitness evaluations (PFE), and pre-landing fitness evaluations.
Science Results for Everyone Cycling in space may conjure up images of Miss Gulch from the Wizard of Oz, but it provides important conditioning for astronauts.  This is especially important for physically demanding space-walk activities outside the space station. Future plans call for up to 24 hours of Extra Vehicular Activity (EVA) per week during lunar and Martian missions, but early evidence suggests this long EVA may be too strenuous. According to the Cycle Ergometer with Vibration Isolation and Stabilization System (CEVIS) investigation, cycling in space could help improve physical stamina for extended EVAs. The study found that exercise heart rate initially goes up during onboard exercise, but approaches preflight levels later on in missions, owing perhaps to the rigoruous exercise regimens, including pedaling.

The following content was provided by Philip Truong, and is maintained in a database by the ISS Program Science Office.
Facility Details

OpNom:

Facility Manager(s)
Philip Truong, NASA Johnson Space Center, Houston, TX, United States

Facility Representative(s)
Tanner Moore, Jacobs Technology, Inc., Houston, TX, United States

Developer(s)
Danish Aerospace Company, Odense, Denmark
NASA Johnson Space Center, Houston, TX, United States

Sponsoring Space Agency
National Aeronautics and Space Administration (NASA)

Sponsoring Organization
Human Exploration and Operations Mission Directorate (HEOMD)

ISS Expedition Duration
March 2001 - December 2002; November 2002 - May 2003; April 2003 - March 2014

Expeditions Assigned
2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19/20,21/22,23/24,25/26,27/28,29/30,31/32,33/34,35/36,37/38

Previous Missions
The Shuttle Cycle Ergometer (SCE), a precursor to CEVIS, was used as a primary exercise device in the Space Shuttle Program. CEVIS was launched to ISS during Expedition 2.

Availability

  • Onboard
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    Facility Description

    Facility Overview

    The Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS) system is essentially a recumbent bicycle, which provides aerobic exercise that is used as a countermeasure to the harmful physiological effects of exposure to microgravity that are anticipated during stays on the ISS. CEVIS is operating in the United States Laboratory Module (US LAB) on the ISS since it was installed in 2001. CEVIS is used as part of the crew members' weekly exercise schedule for approximately 30 to 90 minutes per session per crew member.  Usage depends on each crew member’s exercise preference.
     
    CEVIS is computer controlled and maintains an accurate workload independent of pedal speed. The ergometer contains the main mechanics and electronics. Friction and resistance are applied to an internal flywheel via a braking band, which is adjusted by a stepper motor. The stepper motor adjusts the tension in the braking band to maintain a constant workload independent of pedal speed.
     
    An Inertial Vibration Isolation System (IVIS), consisting of a drive rod and throw masses, is used to stabilize the system by counteracting the motions generated by the crew member. Four wire rope isolators provide a structural attachment between the CEVIS frame and ISS to minimize the vibrations transmitted to the ISS structure. When not in use, the CEVIS system is rotated to a stowed configuration to minimize the protrusion into the ISS aisle.
     
    The CEVIS control panel provides the crew member with an interface to control the system. Various parameters such as workload, cycling speed, heart rate, elapsed time, and exercise prescription details are processed, displayed, and saved to a data file for engineering and medical analysis. The CEVIS system has a workload range of 25 to 350 Watts and a speed range of 30 to 120 RPM.
     
    CEVIS is used in a medical exercise protocol called ‘Max CEVIS’ which replaces a  long standing USOS crew member’s Periodic Fitness Evaluation (PFE). During Max CEVIS, another payload called the Portable Pulmonary Function System (PPFS) is used to measure the crew member’s oxygen uptake and ECG while a specific exercise protocol is performed to evaluate the crew member’s aerobic capacity.

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    Operations

    Facility Operations
    • CEVIS is located and operated in the US Lab on board the ISS.

    • The crew member dons a Heart Rate Monitor chest strap, transmitter, and cycling shoes.

    • The crew member powers on CEVIS and uses the control panel to select their prescribed or user defined exercise prescription prior to exercising.

    • At the completion of their exercise session, the exercise data collected on the control panel and is automatically transferred to a data server where it is sent to the ground for analysis. The crew member exits the control panel, powers down the system, and stows the Ergometer tower.

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    Decadal Survey Recommendations

    Information Pending

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    Results/More Information

    The majority of the data collected to date in the U.S. space program suggests that in-flight maximum oxygen consumption (VO2 max), even with minimal countermeasure participation, is maintained during short duration missions (<14 days). However, there are no clear results yet available from long duration missions. Data from US astronauts performing sub-maximal exercise tests during Skylab and ISS conflict; however, preliminary data from our laboratory suggest that differences in the cycle ergometers used for in-flight testing may largely explain this discrepancy. VO2 max is consistently decreased after short-duration flight, but no similar data are yet available following long-duration missions. Sub-maximal exercise heart rate is elevated afterlong duration spaceflight but recovers top re-fligh tlevels by30 days after landing. Elevated sub-maximal heart rate during and after flight is assumed tore flect decreased VO2 max, and this assumption will soon be tested in an upcoming flight experiment. Microgravity EVA has been successfully completed on both short and long duration missions, although the efficiency of EVA relative to an astronaut’s physical fitness has not been systematically evaluated. NASA’s experience with EVA in partial gravity has been limited to14EVAs during the Apollo era,and none of the Apollo crews completed more than three lunar EVAs per mission. Therefore, it is unknown whether current plans to include up to 24h of EVA per crew member per week during lunar and Martian exploration missions are feasible. Preliminary evidence suggests that the metabolic cost of performing contingency tasks, such as a 10 km return to base, is high and may exceed the aerobic capacity of some astronauts. Current and future investigations will seek to determine the optimal suit design for partial gravity EVA, further define the physical requirements of the tasks required for exploration missions, and refine the countermeasures for longer duration space flight

    Results Publications

      Moore Jr. AD, Lee SM, Stenger MB, Platts SH.  Cardiovascular Exercise in the U.S. Space Program: Past, Present and Future. Acta Astronautica. 2010 Apr-May; 66(7-8): 974-988. DOI: 10.1016/j.actaastro.2009.10.009.

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    Ground Based Results Publications

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    ISS Patents

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    Related Publications

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    Related Websites

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    Imagery

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    ISS032-E-027050 - Expedition 33 Commander Sunita Williams exercises on the Cycle Ergometer with Vibration Isolation System (CEVIS) in the Destiny laboratory of the International Space Station while participating in the first triathlon in space simultaneously with athletes in the Nautica Malibu Triathlon held in Southern California (16 Sept. 2012).

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    ISS032-E-016875 - Astronaut Sunita Williams, Expedition 32 Flight Engineer, performs a VO2max investigation while using the Cycle Ergometer with Vibration Isolation System (CEVIS) in the Destiny laboratory of the International Space Station. VO2max uses the Portable Pulmonary Function System (PPFS), CEVIS, Pulmonary Function System (PFS) gas cylinders and mixing bag system, plus multiple other pieces of hardware to measure oxygen uptake and cardiac output.

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    NASA Image: ISS047E154247 - Commander Tim Kopra exercising on the Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS) in the U.S. Laboratory. Photo taken during Expedition 47.

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    NASA Image: ISS048E004552 - Image taken to document re-installation of the Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS) at LAB1P3 following inflight maintenance (IFM) on the Direct Current to Direct Current Converter Unit-1 (DDCU-1) Rack. Image taken in the Destiny U.S. Laboratory.

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    NASA Image: ISS051E029335 - Flight Engineer and European Space Agency (ESA) astronaut Thomas Pesquet tests a Smartshirt for the EveryWear experiment while exercising on the Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS). Photo taken in the Destiny U.S. Laboratory.

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    NASA Image: JSC2000E18537 - The small isolators unpacked in front of the Cycle Ergometer/Vibration Isolation System (CEVIS) isolator kit.

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    NASA Image: ISS030E007538 - Astronaut Dan Burbank, Expedition 30 Commander, using the Portable Pulmonary Function System (PPFS) hardware while exercising on the Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS) in the U.S. Laboratory.

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