Atsuko (石戸敦子) Ishido
ID 366548
Born : 1972 Cat. W50 Ultrarunner since 2012 JPN
31
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
48
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
27,8%
Rank quotient ?This runner's calculation uses 31 eligible race(s): Σ(rank − 1) = 3 708; Σ finishers = 13 342. 3 708 / 13 342 × 100 = 27.79%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed31
Km — ultra races2 729 km
> 100 km6
Longest race140,0 km
29. Yamaguchi 100 Hagi-O-Kan Maranic 140 km — 3/5/2017

Km per year (ultra races)

103
1 race
2022
411
5 races
2023
203
2 races
2024
50
1 race
2025
150
2 races
2026

Race types (share of distance)

Road88,3%
Trail11,7%

Wins & podiums (ultra)

🏆 Win0
🏆 Win F0
🏅 Top 30
🏅 Top 3 F4
Longest winning streak0
Current streak0

Records

50 km7h12'16100 km9h27'40

HISTORY

31 race(s)
DateRacePerf.Rk
2026
21.06 100km JPN19. Okinoshima 100km Ultra Marathon 14:03:57 h223
04.04 50km JPN5th Ultra Udon Maranic 8:26:55 h83
2025
06.04 50km JPN4th Ultra Udon Maranic - 50km 7:12:16 h16
2024
24.11 103km JPN18th Nagasaki Tachibana Gulf Coast Super Maranic 103 15:15:24 h31
16.06 100km JPN17. Okinoshima 100km Ultra Marathon 13:30:53 h158
2023
11.11 78km JPN10th Michikusa-Ultra, Minamiizu 78 km 11:15:04 h89
15.10 100km JPN5th Yasaka Ultra Marathon in Hamada - 100 km 14:30:16 h51
01.10 70km JPN8th Okumikawa Power Trail 14:13:43 h233
16.07 109.2km JPN15th OSJ Ontake 100km Ultra Trail 19:16:12 h607
04.06 53.7km JPN21th Rishiri Island Ultra Marathon 6:23:39 h104
2022
28.05 103km JPN10th Tojinbo 103 km Ultramarathon 13:06:20 h60
2019
29.09 100km JPN22th Muraoka 100 km Ultra Marathon 12:30:01 h173
19.05 100km JPN25th Yatsugatake Nobeyama 100 km 11:13:19 h214
28.04 100km JPN21. Okukumano 100 km Ultramarathon 10:28:30 h55
13.04 102km JPN5th Okuizumo Ultra Orochi 100km Tooashi 11:38:31 h79
2018
17.06 100km JPN13. Okinoshima 100km Ultra Marathon 10:49:08 h50
2017
24.09 120km JPN20th Muraoka 120 km Ultra Marathon 13:07:45 h69
03.05 140km JPN29. Yamaguchi 100 Hagi-O-Kan Maranic 140 km 21:29:30 h78
2016
25.09 100km JPN19th Muraoka 100 km Ultra Marathon 10:46:26 h37
03.05 70km JPN24. Mukogawa Yurikamome Ultra Marathon 6:07:17 h47
2015
27.09 66km JPN18th Muraoka 66 km Ultra Marathon 6:48:24 h8
21.06 100km JPN10. Okinoshima 100km Ultra Marathon 9:27:40 h26
17.05 77km JPNSaba Highway Ultramarathon 8:39:59 h54
2014
28.09 88km JPN17th Muraoka 88 km Ultra Marathon 11:00:23 h38
29.06 100km JPN29. Lake Saroma 100 km Ultramarathon 10:05:58 h266
18.05 77km JPNSaba Highway Ultramarathon 11:17:48 h353
2013
29.09 66km JPN16th Muraoka 66 km Ultra Marathon 7:54:06 h54
16.06 100km JPN8. Okinoshima 100km Ultra Marathon 10:53:43 h46
04.05 70km JPN25. Yamaguchi 100 Hagi-O-Kan Maranic 70 km 10:15:12 h226
2012
30.09 66km JPN15th Muraoka 66 km Ultra Marathon 8:11:54 h47
03.05 70km JPN20. Mukogawa Yurikamome Ultra Marathon 7:15:34 h164