Kotaro (山外功太郎) Yamasoto
ID 810520
Born : 1977 Cat. M45 Ultrarunner since 2015 JPN
43
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
61
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
2
Countries visited ?GREGreeceJPNJapan
17,0%
Rank quotient ?This runner's calculation uses 43 eligible race(s): Σ(rank − 1) = 2 776; Σ finishers = 16 319. 2 776 / 16 319 × 100 = 17.01%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed43
Km — ultra races5 247 km
> 100 km21
> 160 km9
> 200 km5
> 24h12
> 48h2
Longest race294,8 km
1st Hirosaki 48h Ultra Run — 21/5/2022

Km per year (ultra races)

636
4 races
2022
743
6 races
2023
230
2 races
2024
127
1 race
2025
2026

Race types (share of distance)

Road83,1%
Trail10,3%
Elim.6,6%

Records

50 km8h05'01100 km9h45'5324 h182,50 km48 h294,82 kmBackyard28 loops

HISTORY

43 race(s)
DateRacePerf.Rk
2025
21.06 24h JPN20th Green Charity Marathon Tokyo - Hard Run 24H 127.260 km36
2024
16.11 130km JPN2nd Mito Kaido Journey run 24:19:28 h96
15.06 100km JPN3. OSJ Aizu Bandaisan Ultramarathon - 100 km 12:08:01 h46
2023
23.11 Backyard Ultra JPN4th Last Samurai Standing Backyard Ultra - Fukushima 160.944 km (24h)19
18.11 130km JPN1st Mito Kaido Journey run 19:06:25 h22
28.10 147km JPN5th Autumn leaves in Okumusashi / Chichibu Journey run 17:50:41 h9
24.09 100km JPN1st Mount Akagi 100 Ultra Marathon 11:07:14 h8
19.08 24h JPN23th 24-hour relay & solo marathon Kobe 105.400 km66
04.06 100km JPN2. OSJ Aizu Bandaisan Ultramarathon - 100 km 11:22:49 h26
2022
19.11 Backyard Ultra JPN3rd Last Samurai Standing Backyard Ultra - Fukushima 187.768 km (28h)10
04.09 53.4km JPN15th OSJ Adatara Trail 50K 10:28:00 h88
05.06 100km JPN1. OSJ Aizu Bandaisan Ultramarathon - 100 km 9:50:06 h26
21.05 48h JPN1st Hirosaki 48h Ultra Run 294.824 km4
2021
30.10 146km JPN3rd Autumn leaves in Okumusashi / Chichibu Journey run 18:06:44 h26
17.07 24h JPN1st Japan Trophy 24h 182.500 km22
2020
06.09 50km JPN13th OSJ Adatara Trail 50K 8:05:01 h64
2019
25.08 48km JPN6th Tsukuba Renjyo 48 km Road & Trail Run 5:10:55 h11
03.08 24h JPN19th 24-hour relay & solo marathon Kobe 83.300 km121
01.06 24h JPN18. Green Charity Marathon Tokyo - Hard Run 24H 157.500 km17
19.05 100km JPN25th Yatsugatake Nobeyama 100 km 9:59:13 h81
24.03 100km JPN1st Ibaraki 100k Ultra Marathon 9:53:43 h108
23.02 204km JPN9th Little Edo Oedo 200k 25:34:42 h13
2018
28.09 246km GRE36. Spartathlon 34:48:44 h164
02.09 50km JPN11th OSJ Adatara Trail 50K 10:58:17 h45
04.08 24h JPN18th 24-hour relay & solo marathon Kobe 100.300 km95
17.06 100km JPN2nd Nikko 100km Ultramarathon 9:53:09 h64
10.06 100km JPN7th Hida Takayama 100 km Ultramarathon 9:49:27 h80
02.06 24h JPN17. Green Charity Marathon Tokyo - Hard Run 24H 163.750 km19
22.04 118km JPN28th Fuji 5 Lakes 118 km Challenge 12:55:58 h100
2017
29.09 246km GRE35. Spartathlon 35:22:16 h229
27.08 70km JPN4th Tsukuba Renjyo 70 km Road & Trail Run 7:51:28 h6
02.07 100km JPN1st Nikko 100km Ultramarathon 10:24:20 h100
10.06 24h JPN16. Green Charity Marathon Tokyo - Hard Run 24H 155.372 km19
27.05 50km JPN9th OSJ Okukuji Trail 50k 10:26:46 h63
23.04 118km JPN27th Fuji 5 Lakes 118 km Challenge 14:06:36 h284
04.03 204km JPN7th Little Edo Oedo 200k 32:35:06 h109
2016
18.09 100km JPN19th Jonaizaka 100 km Ultra Marathon 12:22:09 h19
28.08 70km JPN3rd Tsukuba Renjyo 70 km Road & Trail Run 7:53:43 h21
18.06 24h JPN15. Green Charity Marathon Tokyo - Hard Run 24H 121.541 km45
05.06 78km JPN23. Ultramarathon Okumusashi 7:24:49 h131
22.05 100km JPN22nd Yatsugatake Nobeyama 100 km 10:48:22 h142
24.04 100km JPN26th Fuji 5 Lakes 100 km Challenge 9:45:53 h88
2015
30.08 48km JPN2nd Tsukuba Renjyo 48 km Road & Trail Run 6:13:07 h77