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Cycle Ergometer with Vibration Isolation and Stabilization System

04.26.13

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Facility Summary

This content was provided by , and is maintained in a database by the ISS Program Science Office.

Brief Summary

Cycle Ergometer with Vibration Isolation and Stabilization System (CEVIS) provides aerobic and cardiovascular conditioning through recumbent cycling activities.

Facility Manager(s)

Information Pending

Facility Representative(s)

Information Pending

Developer(s)

Danish Aerospace Medical Centre (DAMEC), Copenhagen, , Denmark

Sponsoring Space Agency

National Aeronautics and Space Administration (NASA)

Sponsoring Organization

Human Exploration and Operations Mission Directorate (HEOMD)

ISS Expedition Duration

March 2001 - 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 ISS Missions

CEVIS was launched during Expedition 2.

Availability

Onboard

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Facility Overview

Cycle Ergometer with Vibration Isolation and Stabilization System (CEVIS), essentially a recumbent bicycle, 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 crewmembers weekly exercise schedule.

CEVIS is designed for use as a component of the Crew Health Care System (CHeCS) and Human Research Facility (HRF) 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.

The CEVIS system is designed for use as a component of the CHeCS and HRF on the ISS. CEVIS provides aerobic and cardiovascular conditioning through cycling activities on the ISS. CEVIS also has the capability to support ISS science experiments, pre-breathe EVA s, PFEs, and pre-landing fitness evaluations. CEVIS is operated in the United States Laboratory Module (US LAB) on the ISS and usage depends on crewmember exercise preference and weekly usage varied from 2-7 times for 30-90 minutes per session per crewmember.

CEVIS is a modified version of the Shuttle Inertial Vibration Isolation and Stabilization (IVIS) Cycle Ergometer with the principal difference being the addition of an electronic control system. CEVIS is computer controlled and maintains a very accurate workload independent of the pedaling speed of the crewmember. The CEVIS control panel displays target and actual workload, cycling speed, and heart rate as well as deviation from target cycling speed and heart rate, exercise elapsed time, and protocol. Desired workload for exercise is controlled in the range of 25 to 350 W, in 1 W increments and target and actual pedal speeds from 30 to 120 rpms are displayed. Target and actual parameters (speed, workload, and heart rate), which are defined by predefined protocols or user-defined parameters, are recorded to a PCMCIA (Portable Computer Memory Card International Adapter) Card.

The Ergometer portion of CEVIS is constructed of aluminum and weighs approximately 59 lbs. The exposed moving parts consist of crank arms, pedals, handles, and a clevis fixed to a drive rod. The pedals, when rotated, drive a flywheel through a planetary gear set. The inertial vibration isolation system is used to counteract the motions generated by a crewmember exercising on CEVIS. The isolators provide station-keeping of the rider/cycle system during operations. CEVIS is certified for 15 years on-orbit.

Operations

Facility Operations

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 crewmember 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.