Yumiko (小原由美子) Obara
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Born : 1964
Cat. W60 Ultrarunner since 2016
9
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
26
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?Japan
Japan83,7%
Rank quotient ?This runner's calculation uses 9 eligible race(s): Σ(rank − 1) = 10 829; Σ finishers = 12 937. 10 829 / 12 937 × 100 = 83.71%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed9
Km — ultra races880 km
Longest race100,0 km
36th Fuji 4 Lakes 100 km Challenge — 19/4/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road90,9%
Trail9,1%
Records
HISTORY
9 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 19.04 | 100km | 36th Fuji 4 Lakes 100 km Challenge |
13:46:35 h | 1316 |
| 2024 | ||||
| 15.12 | 100km | 7th Okinawa 100km Ultramarathon |
13:53:36 h | 512 |
| 2023 | ||||
| 15.10 | 100km | 29th River Shimanto 100km |
12:49:33 h | 589 |
| 25.06 | 100km | 38. Lake Saroma 100 km Ultramarathon |
12:20:03 h | 1193 |
| 2019 | ||||
| 19.10 | 100km | 4th Iki 100 km Ultra Marathon |
13:02:21 h | 171 |
| 2018 | ||||
| 22.07 | 80km | 6th Mt. Taisetsu Trail Journey |
11:23:08 h | 158 |
| 24.06 | 100km | 33. Lake Saroma 100 km Ultramarathon |
12:44:36 h | 2037 |
| 2017 | ||||
| 25.06 | 100km | 32. Lake Saroma 100 km Ultramarathon |
12:59:53 h | 2311 |
| 2016 | ||||
| 26.06 | 100km | 31. Lake Saroma 100 km Ultramarathon |
12:54:42 h | 2551 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 19/4/2026 | 36th Fuji 4 Lakes 100 km Challenge | 100,00 | ×3 |
| ✓ 2 | 15/12/2024 | 7th Okinawa 100km Ultramarathon | 100,00 | ×3 |
| ✓ 3 | 15/10/2023 | 29th River Shimanto 100km | 100,00 | ×3 |
| ✓ 4 | 25/6/2023 | 38. Lake Saroma 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 5 | 19/10/2019 | 4th Iki 100 km Ultra Marathon | 100,00 | ×3 |
| ✓ 6 | 24/6/2018 | 33. Lake Saroma 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 7 | 25/6/2017 | 32. Lake Saroma 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 8 | 26/6/2016 | 31. Lake Saroma 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 9 | 22/7/2018 | 6th Mt. Taisetsu Trail Journey | 80,00 | ×3 |