Youko (寒川陽子) Samukawa
ID 94323
Born : 1981 Cat. W45 Ultrarunner since 2007 JPN
39
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
56
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
23,8%
Rank quotient ?This runner's calculation uses 39 eligible race(s): Σ(rank − 1) = 4 538; Σ finishers = 19 081. 4 538 / 19 081 × 100 = 23.78%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed39
Km — ultra races4 518 km
> 100 km10
> 160 km6
> 200 km5
Longest race520,0 km
12th River Road Foot Race 520 km — 30/4/2016

Km per year (ultra races)

155
1 race
2022
51
1 race
2023
2024
2025
2026

Race types (share of distance)

Road65,8%
Trail34,2%

Wins & podiums (ultra)

🏆 Win0
🏆 Win F5
🏅 Top 31
🏅 Top 3 F14
Longest winning streak0
Current streak0

Records

50 km4h45'03100 km8h55'1850 mi11h51'53

HISTORY

39 race(s)
DateRacePerf.Rk
2023
09.04 51.4km JPN1st AYABE Trailrun 7:45:33 h134
2022
02.04 155km JPN2nd Tone River Run Up Journey Run Downstream 22:22:00 h15
2021
27.11 100km JPN3rd Osaka Yodogawa 100 km Ultra Marathon 10:51:46 h38
2020
19.01 100km JPN30th Miyako 100 km Ultramarathon 10:16:32 h49
2019
20.10 100km JPN25th River Shimanto 100km 12:40:07 h621
2017
17.12 68km JPNCoast to Coast 70k Trail Run 9:35:43 h140
15.10 100km JPN6th Noto Peninsula 100 km Ultra Marathon 12:29:28 h162
26.08 65km JPN20th Mt. Tateyama Climbathon 10:37:00 h141
2016
11.12 71.7km JPN3rd Izu Trail Journey 10:36:28 h233
19.11 105km JPN2nd FunTrails100K Round 29:22:29 h302
27.08 60km JPN19th Mt. Tateyama Climbathon 7:43:00 h19
30.04 520km JPN12th River Road Foot Race 520 km 4d 23:32:20 h28
2015
20.11 276km JPNTachibana Bay Coast 273 Ultra Marathon 46:02:41 h7
12.09 201km JPN7th Biwako Tourism Ultramannic 200 km 30:15:00 h2 🥈
04.07 80km JPN5th Utsukushigahara 80 km Trail Run 13:18:52 h175
31.05 100km JPN22nd Ebisu-Daikoku 100 km Marathon 10:14:13 h65
28.02 203km JPN5th Little Edo Oedo 200k 29:54:10 h53
2014
15.06 81.4km JPN1. Spatrail - Shima to Kusatsu 11:51:53 h138
10.05 103km JPN3rd Tojinbo 103 km Ultramarathon 13:03:57 h58
04.05 173km JPN8th Nagasaki Tachibana Gulf Coast Super Maranic 173 24:06:25 h11
18.04 250km JPN21. Sakura Michi Kokusai Nature Run 33:34:48 h45
29.03 100km JPN10th Izu Oshima Ultra 100 km 10:33:55 h19
2013
20.10 71km JPN4th OSJ Hyonosen Mountains Trail Race 13:29:05 h243
2012
06.10 100km JPN9th Echigo Kubikino 100km Ultramarathon 11:05:30 h234
2011
18.09 100km JPN11th Tango 100 km Ultramarathon 12:25:25 h245
17.07 100km JPN4th OSJ Ontake 100km Ultra Trail 15:44:29 h213
2010
30.01 50km JPN2nd OSJ Jungle Trail 50K Amami 5:46:22 h15
17.01 100km JPN20th Miyako 100 km Ultramarathon 10:02:16 h12
2009
18.10 100km JPN15th River Shimanto 100km 9:22:47 h63
11.10 71.5km JPN17th Hasetsune Cup - Japan Mountain Endurance Race 12:10:41 h250
27.09 100km JPN12th Muraoka 100 km Ultra Marathon 10:34:02 h16
21.09 100km JPN1st Shinetsu Five Mountains Trail 100km 14:37:42 h60
05.07 50km JPN1st OSJ Shiga Kogen Trail 50K 8:04:07 h85
08.02 50km JPN1st OSJ Jungle Trail 50K Amami 4:45:03 h14
2008
18.05 100km JPN14th Yatsugatake Nobeyama 100 km 9:35:07 h17
03.05 140km JPN20. Yamaguchi 100 Hagi-O-Kan Maranic 140 km 19:24:31 h20
2007
14.10 71.5km JPN15th Hasetsune Cup - Japan Mountain Endurance Race 13:02:26 h278
24.06 100km JPN22. Lake Saroma 100 km Ultramarathon 8:55:18 h114
27.05 50km JPNOSJ Hakone 50K 10:48:05 h243