Kentaro (安喜健太郎) Aki

Born : 1975 Cat. M50 Ultrarunner since 2013

DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.

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

Countries visited ?

Japan

60,9%

Rank quotient ?This runner's calculation uses 75 eligible race(s): Σ(rank − 1) = 17 126; Σ finishers = 28 109. 17 126 / 28 109 × 100 = 60.93%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed77

Km — ultra races7 382 km

> 100 km18

> 160 km1

Longest race173,0 km

11th Nagasaki Tachibana Gulf Coast Super Maranic 173 — 4/5/2017

Km per year (ultra races)

730

2022

1 223

2023

247

2024

638

2025

396

2026

Race types (share of distance)

Road89,0%

Trail6,4%

Stage3,2%

Ult.Walk1,4%

Records

50 km8h39'30 100 km11h34'31

HISTORY

76 race(s) · 2 stage(s) nested

Date		Race	Perf.	Rk
2026
14.06	100km	5. OSJ Aizu Bandaisan Ultramarathon - 100 km	14:39:46 h	197
14.03	84km	14th Arakawa Riverside Journey - Stage 1	9:54:21 h	25
28.02–01.03	150km/2stages	3rd Modern Japanese Silk Road Journey Run	21:12:43 h	28
28.02	78.2km	3rd Modern Japanese Silk Road Journey Run - Stage 1	10:40:41 h	50
01.03	71.7km	3rd Modern Japanese Silk Road Journey Run - Stage 2	10:32:02 h	23
01.02	62km	4. Minuma Challenge 60	7:32:32 h	51
2025
19.10	70km	32. Ultramarathon Okumusashi	8:45:16 h	221
04.10	151km	2nd Noto Country Journey Run	24:25:26 h	60
30.08	105km	2nd Sendai Ultra 100km	17:18:24 h	30
03.08	50km	1st Chiba Ultra Marathon 50km Day Run	8:39:30 h	16
07.06	100km	4. OSJ Aizu Bandaisan Ultramarathon - 100 km	14:20:56 h	178
01.02	100km	5th Nihondaira and Suruganokuni Ultra Run	18:09:16 h	14
26.01	62km	3. Minuma Challenge 60	7:36:54 h	35
2024
20.10	70km	31. Ultramarathon Okumusashi	10:00:51 h	537
22.09	75km	2nd Mina no Tenku Ultra Marathon	11:56:53 h	124
27.04	102km	3rd Miura-Halbinsel-Tour Ultra Walking	19:27:15 h	32
2023
17.12	100km	6th Okinawa 100km Ultramarathon	13:18:11 h	405
18.11	130km	1st Mito Kaido Journey run	22:42:12 h	89
11.11	100km	10th Michikusa-Ultra, Minamiizu 100 km	13:41:11 h	122
28.10	73km	2nd Kosaka Pass Ultra Run	9:51:37 h	9
15.10	100km	5th Yasaka Ultra Marathon in Hamada - 100 km	14:59:49 h	66
24.09	100km	5th Aga Ultra Marathon - 100km	13:20:21 h	37
09.07	75km	1st Mt. Gassan Foot Ultra Marathon	10:59:30 h	114
01.07	8h	29th 8-Hour Endurance Race Tokorozawa	53.900 km	109
04.06	100km	2. OSJ Aizu Bandaisan Ultramarathon - 100 km	14:55:39 h	131
27.05	100km	5th Tsukuba Rinrin Road 100km	19:48:00 h	78
23.04	100km	2nd Suo-Oshima Ultra Marathon - 100 km	13:42:21 h	114
08.04	71km	18th Toda Saiko 70 km	8:16:13 h	145
01.04	120km	2nd Saitama Romantic Road Chronicle Gaiden Shinryuu	20:23:05 h	20
2022
20.11	63km	1. Minuma Challenge 60	8:10:55 h	52
05.11	128km	3rd Tokyo Great Race 128km	22:45:26 h	23
09.10	100km	14th Echigo Kubikino 100km Ultramarathon	13:53:38 h	830
12.06	84.39km	6th JAL Mukatsuku Double Marathon	10:38:29 h	179
24.04	100km	3rd Yamadera Zao 100 km Ultra Marathon	18:58:08 h	73
02.04	155km	2nd Tone River Run Up Journey Run Downstream	27:08:00 h	63
13.03	100km	4th Ibaraki 100k Ultra Marathon	13:37:26 h	254
2021
04.07	8h	27th 8-Hour Endurance Race Tokorozawa	58.800 km	233
08.05	57km	1st Kimitsu Ultra Marathon	7:53:36 h	195
2020
24.10	146km	2nd Autumn leaves in Okumusashi / Chichibu Journey run	24:37:06 h	153
22.08	101km	8th World Cultural Heritage "Fuji" Foot Race	16:56:43 h	86
2019
08.12	100km	2nd Tobishima Ultra Marathon	13:26:32 h	148
14.09	129km	2nd Utsukushima Fukushima Journey Run 129K	21:42:40 h	28
16.06	100km	14. Okinoshima 100km Ultra Marathon	13:14:21 h	285
02.06	78km	26. Ultramarathon Okumusashi	10:51:04 h	1201
19.05	100km	7th Tokyo Shibamata 100 km	13:52:24 h	1307
28.04	100km	4th Tamagawa Ultra Marathon - 100 km	12:41:25 h	22
24.03	100km	1st Ibaraki 100k Ultra Marathon	13:11:28 h	394
23.02	91km	9th Little Edo 91km	11:35:55 h	21
2018
21.10	100km	7th Noto Peninsula 100 km Ultra Marathon	13:30:00 h	216
23.09	100km	28. Akita Nairiku 100km Marathon	12:41:10 h	363
16.09	88km	9th Akiota Yajirushi Marathon 88km	12:07:00 h	168
10.06	100km	2nd Koyasan and Ryujin-Onsen 100 km Ultra Marathon	13:18:10 h	182
03.06	100km	1st Nanto 100 km Ultramarathon	13:47:15 h	123
20.05	72km	23th Saba Highway Ultramarathon	10:02:36 h	347
22.04	100km	10th 100 km Ultra Maranic Osaka	12:47:33 h	216
03.03	113km	8th Oedo Night run 113k	14:07:46 h	15
2017
04.11	45km	2nd Myoko Ultra Run rAce 18	5:25:33 h	35
15.10	100km	23rd River Shimanto 100km	11:34:31 h	420
02.09	115km	1st Miyagi Yumeguri Ultra Marathon - 115 km	14:03:04 h	42
02.07	100km	1st Nikko 100km Ultramarathon	13:28:09 h	765
28.05	100km	24th Ebisu-Daikoku 100 km Marathon	11:44:29 h	118
04.05	173km	11th Nagasaki Tachibana Gulf Coast Super Maranic 173	30:14:31 h	76
23.04	100km	19. Okukumano 100 km Ultramarathon	11:39:55 h	103
2016
15.10	100km	7th Inagawa 100km Ultra-Marathon	13:30:12 h	50
09.10	100km	11th Echigo Kubikino 100km Ultramarathon	11:53:56 h	486
25.09	100km	19th Muraoka 100 km Ultra Marathon	13:40:15 h	359
28.05	103km	5th Tojinbo 103 km Ultramarathon	11:28:46 h	23
03.05	70km	24. Mukogawa Yurikamome Ultra Marathon	7:17:55 h	237
24.04	118km	26th Fuji 5 Lakes 118 km Challenge	14:17:11 h	378
2015
29.08	100km	KISO Great Traverse 100 km Ultra Marathon	13:08:44 h	150
11.04	102km	1st Okuizumo Ultra Orochi 100km Tooashi	11:52:39 h	29
2014
21.09	100km	2nd 100 km Ultramarathon Hakusan-Shirakawago	13:45:33 h	317
27.07	77km	21. Ultramarathon Okumusashi	10:27:01 h	581
08.06	100km	3rd Hida Takayama 100 km Ultramarathon	12:06:43 h	380
18.05	100km	20th Yatsugatake Nobeyama 100 km	13:18:07 h	718
2013
15.09	100km	13th Tango 100 km Ultramarathon	13:37:18 h	1073
09.06	100km	9th Iwate Ginga 100km Marathon Challenge	13:30:40 h	697
02.03	111km	3rd Oedo Night run 111k	16:35:24 h	25

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	4/5/2017	11th Nagasaki Tachibana Gulf Coast Super Maranic 173	173,00	×2
✓ 2	2/4/2022	2nd Tone River Run Up Journey Run Downstream	155,00	×2
✓ 3	4/10/2025	2nd Noto Country Journey Run	151,00	×2
✓ 4	28/2/2026	3rd Modern Japanese Silk Road Journey Run	150,00	×2
✓ 5	24/10/2020	2nd Autumn leaves in Okumusashi / Chichibu Journey run	146,00	×2
✓ 6	18/11/2023	1st Mito Kaido Journey run	130,00	×1
✓ 7	14/9/2019	2nd Utsukushima Fukushima Journey Run 129K	129,00	×1
✓ 8	5/11/2022	3rd Tokyo Great Race 128km	128,00	×1
✓ 9	1/4/2023	2nd Saitama Romantic Road Chronicle Gaiden Shinryuu	120,00	×1
✓ 10	24/4/2016	26th Fuji 5 Lakes 118 km Challenge	118,00	×1
✓ 11	2/9/2017	1st Miyagi Yumeguri Ultra Marathon - 115 km	115,00	×1
✓ 12	3/3/2018	8th Oedo Night run 113k	113,00	×1
✓ 13	2/3/2013	3rd Oedo Night run 111k	111,00	×1
✓ 14	30/8/2025	2nd Sendai Ultra 100km	105,00	×1
✓ 15	28/5/2016	5th Tojinbo 103 km Ultramarathon	103,00	×1
✓ 16	27/4/2024	3rd Miura-Halbinsel-Tour Ultra Walking	102,00	×1
✓ 17	11/4/2015	1st Okuizumo Ultra Orochi 100km Tooashi	102,00	×1
✓ 18	22/8/2020	8th World Cultural Heritage "Fuji" Foot Race	101,00	×1
✓ 19	14/6/2026	5. OSJ Aizu Bandaisan Ultramarathon - 100 km	100,00	×1
✓ 20	7/6/2025	4. OSJ Aizu Bandaisan Ultramarathon - 100 km	100,00	×1
✓ 21	1/2/2025	5th Nihondaira and Suruganokuni Ultra Run	100,00	×1
✓ 22	17/12/2023	6th Okinawa 100km Ultramarathon	100,00	×1
✓ 23	11/11/2023	10th Michikusa-Ultra, Minamiizu 100 km	100,00	×1
✓ 24	15/10/2023	5th Yasaka Ultra Marathon in Hamada - 100 km	100,00	×1
✓ 25	24/9/2023	5th Aga Ultra Marathon - 100km	100,00	×1
✓ 26	4/6/2023	2. OSJ Aizu Bandaisan Ultramarathon - 100 km	100,00	×1
✓ 27	27/5/2023	5th Tsukuba Rinrin Road 100km	100,00	×1
✓ 28	23/4/2023	2nd Suo-Oshima Ultra Marathon - 100 km	100,00	×1
✓ 29	9/10/2022	14th Echigo Kubikino 100km Ultramarathon	100,00	×1
✓ 30	24/4/2022	3rd Yamadera Zao 100 km Ultra Marathon	100,00	×1
✓ 31	13/3/2022	4th Ibaraki 100k Ultra Marathon	100,00	×1
✓ 32	8/12/2019	2nd Tobishima Ultra Marathon	100,00	×1
✓ 33	16/6/2019	14. Okinoshima 100km Ultra Marathon	100,00	×1
✓ 34	19/5/2019	7th Tokyo Shibamata 100 km	100,00	×1
✓ 35	28/4/2019	4th Tamagawa Ultra Marathon - 100 km	100,00	×1
✓ 36	24/3/2019	1st Ibaraki 100k Ultra Marathon	100,00	×1
✓ 37	21/10/2018	7th Noto Peninsula 100 km Ultra Marathon	100,00	×1
✓ 38	23/9/2018	28. Akita Nairiku 100km Marathon	100,00	×1
✓ 39	10/6/2018	2nd Koyasan and Ryujin-Onsen 100 km Ultra Marathon	100,00	×1
✓ 40	3/6/2018	1st Nanto 100 km Ultramarathon	100,00	×1
✓ 41	22/4/2018	10th 100 km Ultra Maranic Osaka	100,00	×1
✓ 42	15/10/2017	23rd River Shimanto 100km	100,00	×1
✓ 43	2/7/2017	1st Nikko 100km Ultramarathon	100,00	×1
✓ 44	28/5/2017	24th Ebisu-Daikoku 100 km Marathon	100,00	×1
✓ 45	23/4/2017	19. Okukumano 100 km Ultramarathon	100,00	×1
✓ 46	15/10/2016	7th Inagawa 100km Ultra-Marathon	100,00	×1
✓ 47	9/10/2016	11th Echigo Kubikino 100km Ultramarathon	100,00	×1
✓ 48	25/9/2016	19th Muraoka 100 km Ultra Marathon	100,00	×1
✓ 49	29/8/2015	KISO Great Traverse 100 km Ultra Marathon	100,00	×1
✓ 50	21/9/2014	2nd 100 km Ultramarathon Hakusan-Shirakawago	100,00	×1
✓ 51	8/6/2014	3rd Hida Takayama 100 km Ultramarathon	100,00	×1
✓ 52	18/5/2014	20th Yatsugatake Nobeyama 100 km	100,00	×1
✓ 53	15/9/2013	13th Tango 100 km Ultramarathon	100,00	×1
✓ 54	9/6/2013	9th Iwate Ginga 100km Marathon Challenge	100,00	×1
✓ 55	23/2/2019	9th Little Edo 91km	91,00	×1
✓ 56	16/9/2018	9th Akiota Yajirushi Marathon 88km	88,00	×1
✓ 57	12/6/2022	6th JAL Mukatsuku Double Marathon	84,39	×1
✓ 58	2/6/2019	26. Ultramarathon Okumusashi	78,00	×1
✓ 59	27/7/2014	21. Ultramarathon Okumusashi	77,00	×1
✓ 60	22/9/2024	2nd Mina no Tenku Ultra Marathon	75,00	×1
✓ 61	9/7/2023	1st Mt. Gassan Foot Ultra Marathon	75,00	×1
✓ 62	28/10/2023	2nd Kosaka Pass Ultra Run	73,00	×1
✓ 63	20/5/2018	23th Saba Highway Ultramarathon	72,00	×1
✓ 64	8/4/2023	18th Toda Saiko 70 km	71,00	×1
✓ 65	19/10/2025	32. Ultramarathon Okumusashi	70,00	×1
✓ 66	20/10/2024	31. Ultramarathon Okumusashi	70,00	×1
✓ 67	3/5/2016	24. Mukogawa Yurikamome Ultra Marathon	70,00	×1
68	20/11/2022	1. Minuma Challenge 60	63,00	—
69	1/2/2026	4. Minuma Challenge 60	62,00	—
70	26/1/2025	3. Minuma Challenge 60	62,00	—
71	4/7/2021	27th 8-Hour Endurance Race Tokorozawa	58,80	—
72	8/5/2021	1st Kimitsu Ultra Marathon	57,00	—
73	1/7/2023	29th 8-Hour Endurance Race Tokorozawa	53,90	—
74	3/8/2025	1st Chiba Ultra Marathon 50km Day Run	50,00	—
75	4/11/2017	2nd Myoko Ultra Run rAce 18	45,00	—