A previous study reported that the instantaneous risk of developing a Herniated Nucleus Pulposus (HNP) was higher in astronauts who had flown at least one mission, as compared with those in the corps who had not yet flown. However, the study only analyzed time to HNP after the first mission (if any) and did not account for the possible effects of multiple missions. While many HNPs occurred well into astronauts' careers or in somecases years after retirement, the higher incidence of HNPs relatively soon after completion of space missions appears to indicate that spaceflight may lead to an increased risk of HNP. In addition, when an HNP occurs after spaceflight, is it related to previous spaceflight exposure? The purpose of this study was to investigate whether multiple missions, sex, age, vehicle landing dynamics, and flight duration affect the risk of developing an HNP usinga competing risks model. The outcome of the study will inform the Human System Risk Board assessment of back pain, inform the risk of injury due to dynamic loads, and update the previous dataset, which contained events up to December 31, 2006.


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    Title :

    Assessing the Effect of Spaceflight on the Propensity for Astronauts to Develop Disc Herniation


    Contributors:
    Feiveson, A. (author) / Mendez, C. (author) / Somers, J. (author)

    Conference:

    Human Research Program Investigators'' Workshop ; 2015 ; Galveston, TX, United States


    Publication date :

    2015-01-13


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English