Ai (長谷川愛) Hasegawa
ID 224425
Born : 1978 Cat. W45 Ultrarunner since 2008 JPN
41
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
3
Countries visited ?FRAFranceHKGHong KongJPNJapan
55,4%
Rank quotient ?This runner's calculation uses 41 eligible race(s): Σ(rank − 1) = 15 632; Σ finishers = 28 235. 15 632 / 28 235 × 100 = 55.36%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed41
Km — ultra races3 814 km
> 100 km10
> 160 km4
> 200 km1
> 24h1
Longest race203,0 km
5th Little Edo Oedo 200k — 28/2/2015

Km per year (ultra races)

2022
167
1 race
2023
2024
80
1 race
2025
2026

Race types (share of distance)

Road62,4%
Trail37,6%

Wins & podiums (ultra)

🏆 Win0
🏆 Win F0
🏅 Top 30
🏅 Top 3 F1
Longest winning streak0
Current streak0

Records

50 km6h39'12100 km11h24'4950 mi21h53'4124 h156,80 km

HISTORY

41 race(s)
DateRacePerf.Rk
2025
20.09 80km JPN11th SkyViewTrail Memorial Cup 21:53:41 h266
2023
21.04 167km JPN8th Ultra-Trail Mt. Fuji 43:29:13 h1589
2019
23.06 72.6km JPN6. Spatrail - Shima to Kusatsu 72K 12:22:34 h418
05.01 115km HKG4th Ultra-Trail Tai Mo Shan (TTF) 115 km 21:22:28 h17
2018
31.08 171km FRA16ème Ultra Trail Tour du Mont Blanc 42:27:42 h1061
27.04 170km JPN5th Ultra-Trail Mt. Fuji 35:02:55 h204
02.03 100km HKG7th TransLantau 100 Ultra Trail 23:12:37 h128
2017
08.10 71.5km JPN25th Hasetsune Cup - Japan Mountain Endurance Race 17:56:33 h1025
23.09 129km JPN4th SkyView Ultra-Trail 120 - Yamada Noboru Memorial Cup 28:49:32 h210
10.09 50km JPN10th OSJ Adatara Trail 50K 12:26:25 h73
23.04 70km JPN3rd Okumikawa Power Trail 12:23:00 h296
2016
11.12 71.7km JPN3rd Izu Trail Journey 11:02:06 h325
20.11 50km JPN1st Minami Alps Mountain Marathon 7:02:01 h50
16.10 100km JPN22nd River Shimanto 100km 13:03:37 h809
02.10 50km JPN10th Madarao Forest Trails 50km 6:39:12 h97
16.07 65km JPN7th Nozawa Onsen 4100D Mountain Trail 12:38:52 h181
2015
20.09 153km JPN18th Karisakatoge beyond Chichibu Run 26:02:34 h154
12.07 8h JPN21th 8-Hour Endurance Race Tokorozawa - 3 tai 49.395 km84
22.06 77km JPN22. Ultramarathon Okumusashi 9:57:01 h844
28.02 203km JPN5th Little Edo Oedo 200k 34:56:10 h184
2014
19.10 100km JPN20th River Shimanto 100km 12:37:54 h626
14.09 142km JPN17th Karisakatoge beyond Chichibu Run 23:22:50 h134
27.07 77km JPN21. Ultramarathon Okumusashi 11:39:03 h952
21.06 24h JPN13. Tokyo Challenge 24 hours 156.800 km24
2013
20.10 100km JPN19th River Shimanto 100km 11:24:49 h288
15.09 142km JPN16th Karisakatoge beyond Chichibu Run 25:02:09 h155
28.07 77km JPN20. Ultramarathon Okumusashi 9:54:22 h719
07.07 8h JPN19th 8-Hour Endurance Race Tokorozawa 51.936 km127
02.03 91km JPN3rd Little Edo 91km 13:31:02 h50
2012
21.10 100km JPN18th River Shimanto 100km 11:52:23 h362
21.09 60km JPN12th Tango 60 km Ultramarathon 7:29:42 h131
05.08 77km JPN19. Ultramarathon Okumusashi 10:36:50 h730
08.07 8h JPN18th 8-Hour Endurance Race Tokorozawa 61.674 km135
2011
16.10 100km JPN17th River Shimanto 100km 12:42:53 h576
18.09 60km JPN11th Tango 60 km Ultramarathon 7:38:32 h172
07.08 77km JPN18. Ultramarathon Okumusashi 10:59:55 h911
10.07 8h JPN17th 8-Hour Endurance Race Tokorozawa 45.444 km228
2010
17.10 100km JPN16th River Shimanto 100km 13:14:41 h737
19.09 60km JPN10th Tango 60 km Ultramarathon 7:11:27 h163
2009
20.09 60km JPN9th Tango 60 km Ultramarathon 7:17:59 h187
2008
14.09 60km JPN8th Tango 60 km Ultramarathon 8:42:02 h251