Kosuke (八尾浩輔) Yao
Born : 1971 Cat. M55 Ultrarunner since 2012 JPN
24
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
45
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 ?JPNJapan
22,5%
Rank quotient ?This runner's calculation uses 24 eligible race(s): Σ(rank − 1) = 2 346; Σ finishers = 10 446. 2 346 / 10 446 × 100 = 22.46%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed27
Km — ultra races2 514 km
> 100 km10
> 160 km1
Longest race160,9 km

Km per year (ultra races)

2022
2023
2024
387
4 races
2025
410
3 races
2026

Race types (share of distance)

Road56,9%
Trail26,5%
Stage16,5%

Wins & podiums (ultra)

🏆 Win0
🏆 Win M1
🏅 Top 33
🏅 Top 3 M3
Longest winning streak0
Current streak0

HISTORY

24 race(s) · 6 stage(s) nested
DateRacePerf.Rk
2026
19.04 100km JPN36th Fuji 4 Lakes 100 km Challenge 12:38:55 h677
28.03 160km JPN1st Shinkun Iga-goe Route Journey Run 26:07:23 h42
28.02–01.03 150km/2stages JPN3rd Modern Japanese Silk Road Journey Run 21:12:02 h27
2025
01–02.11 130km/2stages JPN3rd Mito Kaido Journey run 16:14:55 h10
03.08 50km JPN1st Chiba Ultra Marathon 50km Day Run 6:11:04 h2 🥈
12.04 71km JPN20th Toda Saiko 70 km 7:12:16 h73
15–16.03 136km/2stages JPN13th Arakawa Riverside Journey Stage Race 17:10:05 h14
2018
08.07 49.6km JPN7th Trainic world Ogose-Tokigawa Trail Run 50km 8:27:37 h116
03.03 113km JPN8th Oedo Night run 113k 12:04:06 h3 🥉
2017
23.09 129km JPN4th SkyView Ultra-Trail 120 - Yamada Noboru Memorial Cup 27:57:59 h176
2016
18.09 144km JPN19th Karisakatoge beyond Chichibu Run 20:40:36 h28
03.07 8h JPN22th 8-Hour Endurance Race Tokorozawa - 3 tai 71.412 km17
12.06 50km JPN3rd Trainic world Hanno-Ogose Trail Run 50km 8:51:22 h40
05.03 91km JPN6th Little Edo 91km 8:37:28 h2 🥈
2015
26.09 76.7km JPN4th Shizuoka to Yamanashi 15:40:06 h257
18.07 100mi JPN8th OSJ Ontake 100 Mile Ultra Trail 21:38:10 h18
22.06 77km JPN22. Ultramarathon Okumusashi 7:37:48 h174
2014
14.09 142km JPN17th Karisakatoge beyond Chichibu Run 19:23:37 h36
19.07 100km JPN7th OSJ Ontake 100km Ultra Trail 13:46:43 h199
01.06 100km JPN2nd Tokyo Shibamata 100 km 9:57:01 h21
12.04 70km JPN9th Toda Saiko 70 km 6:22:19 h31
2013
15.09 142km JPN16th Karisakatoge beyond Chichibu Run 19:55:35 h34
01.06 100km JPN1st Tokyo Shibamata 100 km 10:53:12 h217
2012
20.05 100km JPN18th Yatsugatake Nobeyama 100 km 11:14:07 h156