Masuo (大場満寿夫) Oba
ID 971663
Born : 1961 Cat. M65 Ultrarunner since 2017 JPN
30
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
60
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
67,5%
Rank quotient ?This runner's calculation uses 31 eligible race(s): Σ(rank − 1) = 7 550; Σ finishers = 11 190. 7 550 / 11 190 × 100 = 67.47%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed34
Km — ultra races4 466 km
> 100 km18
> 160 km6
> 200 km6
Longest race514,0 km
15th River Road Foot Race 514 km — 30/4/2019

Km per year (ultra races)

488
5 races
2022
251
1 race
2023
151
1 race
2024
151
1 race
2025
2026

Race types (share of distance)

Road88,2%
Trail2,6%
Stage9,1%

Records

100 km12h25'21

HISTORY

31 race(s) · 4 stage(s) nested
DateRacePerf.Rk
2025
04.10 151km JPN2nd Noto Country Journey Run 26:23:49 h103
2024
05.10 151km JPN1st Noto Country Journey Run 25:53:05 h117
2023
03.05 251km JPN18th River Road Foot Race 251 km 2d 06:34:00 h43
2022
20.08 101km JPN9th World Cultural Heritage "Fuji" Foot Race 16:41:15 h108
03.07 8h JPN28th 8-Hour Endurance Race Tokorozawa 53.900 km164
05.06 78km JPN29. Ultramarathon Okumusashi 10:17:11 h610
22.05 100km JPN28th Yatsugatake Nobeyama 100 km 14:10:08 h1066
02.04 155km JPN2nd Tone River Run Up Journey Run Downstream 26:57:00 h62
2021
16.10 120km JPN1st Tone River Run Up Journey Run Upstream 17:57:00 h25
17.07 117km JPN1st Nakasendo Ultra 25:13:00 h30
04.07 8h JPN27th 8-Hour Endurance Race Tokorozawa 73.500 km91
30.04 503km JPN16th River Road Foot Race 503 km 5d 12:10:14 h69
03–04.04 136km/2stages JPN9th Arakawa Riverside Journey Stage Race 19:30:00 h29
2020
19.09 123km JPN3rd Utsukushima Fukushima Journey Run 123K 17:43:08 h51
05.07 8h JPN26th 8-Hour Endurance Race Tokorozawa 68.600 km78
21.03 136km/2stages JPN8th Arakawa Riverside Journey Stage Race 19:03:42 h40
22.02 206km JPN10th Little Edo Oedo 205k 34:17:12 h156
12.01 100km JPN5th Yakushima Ultramarathon 100 km 13:27:18 h71
2019
02.11 103km JPNTachibana Bay Coast 103 Ultra Marathon 14:21:27 h41
14.09 129km JPN2nd Utsukushima Fukushima Journey Run 129K 21:43:39 h29
13.07 263km JPN4th Michinoku Tsugaru Journey Run 263K 2d 02:15:53 h105
02.06 78km JPN26. Ultramarathon Okumusashi 11:06:29 h1284
30.04 514km JPN15th River Road Foot Race 514 km 5d 11:29:54 h86
16–17.03 136km/2stages JPN7th Arakawa Riverside Journey Stage Race 18:29:30 h46
2018
21.10 100km JPN24th River Shimanto 100km 12:25:21 h619
01.09 95k JPN2nd Miyagi Yumeguri Ultra Marathon - 95 km 14:23:28 h16
30.06 8h JPN24th 8-Hour Endurance Race Tokorozawa 53.900 km146
03.06 78km JPN25. Ultramarathon Okumusashi 11:08:30 h1107
03.05 254km JPN14th River Road Foot Race 254 km 2d 05:44:32 h37
2017
01.07 8h JPN23rd 8-Hour Endurance Race Tokorozawa 55.182 km179
04.06 78km JPN24. Ultramarathon Okumusashi 10:20:51 h973