Masayuki (栗原正幸) Kurihara
ID 460370
Born : 1975 Cat. M50 Ultrarunner since 2013 JPN
39
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
51
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
57,8%
Rank quotient ?This runner's calculation uses 39 eligible race(s): Σ(rank − 1) = 21 619; Σ finishers = 37 414. 21 619 / 37 414 × 100 = 57.78%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed39
Km — ultra races3 997 km
> 100 km11
> 160 km1
> 24h1
Longest race200,0 km
16th Little Edo Oedo 200k — 14/3/2026

Km per year (ultra races)

565
5 races
2022
100
1 race
2023
443
4 races
2024
558
5 races
2025
462
4 races
2026

Race types (share of distance)

Road100,0%

Records

50 km5h54'48100 km11h24'5124 h104,50 km

HISTORY

39 race(s)
DateRacePerf.Rk
2026
28.06 100km JPN41. Lake Saroma 100 km Ultramarathon 12:26:21 h1816
17.05 100km JPN32th Yatsugatake Nobeyama 100 km 13:43:21 h989
14.03 200km JPN16th Little Edo Oedo 200k 35:29:15 h230
01.02 62km JPN4. Minuma Challenge 60 7:05:17 h37
2025
15.11 142km JPN7th Autumn leaves in Okumusashi / Chichibu Journey run 23:48:47 h88
26.10 100km JPN7th Yasaka Ultra Marathon in Hamada - 100 km 14:47:20 h70
19.07 154km JPN9th Michinoku Tsugaru Journey Run 154K 29:15:55 h36
29.06 100km JPN40. Lake Saroma 100 km Ultramarathon 12:36:07 h1391
26.01 62km JPN3. Minuma Challenge 60 7:54:30 h46
2024
15.09 128km JPN7th Utsukushima Fukushima Journey Run 128K 22:07:45 h20
30.06 100km JPN39. Lake Saroma 100 km Ultramarathon 12:43:41 h1485
21.04 100km JPN34th Fuji 4 Lakes 100 km Challenge 12:53:46 h790
09.03 115km JPN14th Oedo Night run 115k 17:52:14 h49
2023
25.06 100km JPN38. Lake Saroma 100 km Ultramarathon 12:49:00 h1663
2022
15.10 150km JPN1st Yagurazawa Round Trip Pre-Tournament 30:35:06 h66
17.09 100km JPN1st Furano Biei Nature Run 100km 13:26:03 h46
12.06 100km JPN16th Iwate Ginga 100km Marathon Challenge 11:45:46 h269
22.05 100km JPN28th Yatsugatake Nobeyama 100 km 12:57:37 h479
12.03 115km JPN12th Oedo Night run 115k 16:21:10 h28
2021
27.03 115km JPN11th Oedo Night run 115k 17:39:11 h35
2020
22.02 115km JPN10th Oedo Night run 115k 18:18:49 h90
19.01 100km JPN30th Miyako 100 km Ultramarathon 11:24:51 h101
2019
20.10 100km JPN25th River Shimanto 100km 11:50:42 h420
30.06 100km JPN34. Lake Saroma 100 km Ultramarathon 11:36:16 h1051
2018
29.09 24h JPN3rd Coedo Kawagoe Running Fest 24-hours run 104.500 km21
24.06 100km JPN33. Lake Saroma 100 km Ultramarathon 11:30:52 h1064
20.05 100km JPN24th Yatsugatake Nobeyama 100 km 12:53:54 h702
03.03 113km JPN8th Oedo Night run 113k 16:38:36 h45
2017
25.06 100km JPN32. Lake Saroma 100 km Ultramarathon 12:35:48 h1702
04.06 100km JPN5th Tokyo Shibamata 100 km 12:17:29 h707
04.03 91km JPN7th Little Edo 91km 12:15:03 h32
2016
26.06 100km JPN31. Lake Saroma 100 km Ultramarathon 11:33:45 h1204
05.06 60km JPN4th Tokyo Shibamata 60 km 6:05:16 h122
2015
28.06 100km JPN30. Lake Saroma 100 km Ultramarathon 12:31:16 h1994
06.06 60km JPN3rd Tokyo Shibamata 60 km 6:28:05 h205
19.04 100km JPN25th Fuji 5 Lakes 100 km Challenge 13:12:22 h909
2014
29.06 100km JPN29. Lake Saroma 100 km Ultramarathon 12:37:58 h1281
01.06 60km JPN2nd Tokyo Shibamata 60 km 7:41:02 h250
2013
30.06 50km JPN28. Lake Saroma 50 km Ultramarathon 5:54:48 h125