Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS) System (CEVIS) - 01.10.18

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 Ray M. Eid, and is maintained in a database by the ISS Program Science Office.
Facility Details

OpNom:

Facility Manager(s)
Ray M. Eid, Johnson Space Center, Houston, TX, United States

Facility Representative(s)
Tanner Moore, Jacobs, 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
  • ^ back to top

    Facility Description

    Facility Overview

    • Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS) system, is essentially a recumbent bicycle, which provides aerobic exercise and is intended as a countermeasure for the harmful physiological effects of exposure to microgravity that are anticipated during stays on the ISS. CEVIS is utilized as part of the crew members' weekly exercise schedule.
    • CEVIS is designed for use as a component of the Crew Health Care System (CHeCS) on the ISS.
    • CEVIS also has the capability to support ISS science activities, pre-breathe extravehicular activities (EVA), periodic fitness evaluations (PFE), and pre-landing fitness evaluations.
    CEVIS is operated in the United States Laboratory Module (US LAB) on the ISS. Usage depends on crew member exercise preference and weekly usage varies from 2 to 7 times for 30 to 90 minutes per session per crew member. CEVIS is a modified version of the Shuttle Cycle Ergometer (SCE), with the principal difference being the addition of an electronic control system and an inertial vibration isolation and stabilization (IVIS) system. CEVIS is computer-controlled, and maintains a very accurate workload independent of the pedaling speed of the crew member. The CEVIS control panel displays target and actual workload, cycling speed, heart rate, deviation from target cycling speed and heart rate, exercise elapsed time, and loaded exercise prescription. Desired workload for exercise is controlled in the range of 25 to 350 W, in 1 W increments at pedal speeds from 30 to 120 RPM. Target and actual parameters (speed, workload, and heart rate), which are defined by predefined prescriptions or user-defined parameters, are recorded to a data file on a flash drive. The exercise data from the flash drive is downloaded to a station support computer (SSC) for ground analysis. The Ergometer portion of CEVIS is constructed of aluminum, and weighs approximately 130 kg (59 lbs). The exposed moving parts consist of crank arms, pedals, and handles. During rotation, the pedals drive a flywheel through a planetary gear set. Friction is applied to a flywheel by a braking band driven by a stepper motor. Feedback from a torque sensor enables the stepper motor to maintain a constant workload. The pedals also engage the IVIS system which consists of a drive rod connected to throw masses inside two IVIS boxes. The IVIS system is used to counteract the motions generated by a crew member exercising on CEVIS. Four isolators provide vibration isolation of the system from ISS structure during operations. A mounting frame provides the interface between the ergometer and isolators. The frame places the CEVIS system above the face of an ISS rack, but allows the ergometer to rotate 90° to a stowed position when not in use to minimize the protrusion into the ISS lab aisle and pathway.

    ^ back to top

    Operations

    Facility Operations

    • CEVIS is located and operated in the US Lab onboard the ISS.
    • The crew member dons Heart Rate Monitor chest strap and transmitter.
    • The flash drive, loaded with exercise prescriptions, is inserted into the CEVIS control panel.
    • The crew member performs an exercise sessions following the prescribed or user-defined exercise protocol.
    • The crew member downloads the exercise data from the flash drive to the station support computer (SSC) for ground analysis.

    ^ back to top

    Decadal Survey Recommendations

    Information Pending

    ^ back to top
    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.

    ^ back to top

    Ground Based Results Publications

    ^ back to top

    ISS Patents

    ^ back to top

    Related Publications

    ^ back to top

    Related Websites

    ^ back to top


    Imagery

    image
    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).

    + View Larger Image


    image
    ISS032-E-016875 - Astronaut Sunita Williams, Expedition 32 Flight Engineer, performs a VO2max experiment 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.

    + View Larger Image


    image
    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.

    + View Larger Image


    image
    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.

    + View Larger Image


    image
    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.

    + View Larger Image


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

    + View Larger Image


    image
    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.

    + View Larger Image