Source Register
Last reviewed: June 12, 2026
This register tracks the key sources used across Multiday Running. It is not a complete bibliography for every article, but it identifies the main sources behind recurring claims about race formats, records, safety, nutrition, sleep, and gear.
| Claim Area | Primary Source | Confidence / Notes |
|---|---|---|
| Multiday and timed-race formats, records, and championship context | Global Organization of Multi-Day Ultramarathonists | High for GOMU-governed formats and published records |
| 24-hour ultrarunning championship and record context | International Association of Ultrarunners | High for IAU-sanctioned formats and records |
| Backyard ultra rules, rankings, and event format | Backyard Ultra | High for official backyard format rules |
| Historical ultramarathon results and rankings | Deutsche Ultramarathon-Vereinigung statistics database | High for results lookup and historical context |
| Exercise-associated hyponatremia guidance | Hew-Butler et al., 2015 consensus statement | High for clinical consensus; not individual medical advice |
| Gut training and endurance fueling context | Jeukendrup 2017; Costa et al. 2019 | Moderate to high; individual tolerance varies |
| Sleep deprivation in ultra-endurance events | Martin et al., Sleep Medicine Reviews, 2018 | Moderate to high; race format and individual response vary |
| Shoe and gear specifications | Manufacturer data, Running Warehouse, Doctors of Running, OutdoorGearLab | Moderate; product specs and availability change |
Corrections
If a source has moved, a record has changed, or a claim needs stronger evidence, email hello@multidayrunning.com with the page URL and suggested source.