In previous publications we have reported that the heart rate (HR) responses to graded submaximal exercise tests are elevated during long-duration International Space Station (ISS) flights. Furthermore, the elevation in HR appears greater earlier, rather than later, during the missions. A potential confounder in the interpretation of HR results from graded exercise tests on ISS is that the cycle ergometer used (CEVIS) is vibration-isolated from the station structure. This feature causes the CEVIS assembly to sway slightly during its use and debriefing comments by some crewmembers indicate that there is a "learning curve" associated with CEVIS use. Therefore, one could not exclude the possibility that the elevated HRs experienced in the early stages of ISS missions were related to a lowered metabolic efficiency of CEVIS exercise that would raise the submaximal oxygen uptake (VO2) associated with graded exercise testing work rates.


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    Title :

    Oxygen Uptake Responses to Submaximal Exercise Loads Do Not Change During Long-Duration Space Flight



    Conference:

    Human Research Program Investigators'' Workshop (HRP) ; 2012 ; Houston, TX, United States


    Publication date :

    2011-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English