We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleHistorical Analysis of Participation in 161 km Ultramarathons in North America.AuthorsHoffman, MartinD.; Ong, JuneC.; Wang, GaryPublicationInternational Journal of the History of Sport, 2010, Vol 27, Issue 11, p1877ISSN0952-3367Publication typearticleDOI10.1080/09523367.2010.494385