Figure 1.
Number of events (total n = 2067) (A), participants by sex (total n = 715,539) (B), participants-events ratio (C) and participants by Age group (D) of 100-km ultra-marathons from 1960 to 2019.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.