Isao (梅澤功) Umezawa

Born : 1964 Cat. M60 Ultrarunner since 2007

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

112

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 ?

Greece

Japan

Taiwan

7,7%

Rank quotient ?This runner's calculation uses 105 eligible race(s): Σ(rank − 1) = 2 567; Σ finishers = 33 454. 2 567 / 33 454 × 100 = 7.67%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed105

Km — ultra races19 689 km

> 100 km60

> 160 km48

> 200 km40

> 24h8

> 48h3

Longest race521,0 km

Across Honshu R8 Foot Race — 21/8/2018

Km per year (ultra races)

2022

2023

2024

2025

2026

Race types (share of distance)

Road81,4%

Trail18,6%

Wins & podiums (ultra)

🏆 Win10

🏆 Win M10

🏅 Top 323

🏅 Top 3 M25

Longest winning streak1

Current streak0

Records

50 km6h50'26 100 km8h04'08 100 mi21h50'55 6 h68,84 km 12 h128,23 km 24 h224,02 km 48 h336,96 km

HISTORY

105 race(s) · 23 split(s) nested

Date		Race	Perf.	Rk
2021
30.04	503km	16th River Road Foot Race 503 km	3d 16:26:11 h	3 🥉
2020
22.02	206km	10th Little Edo Oedo 205k	29:07:53 h	40
07.02	48h	9th Taipei 48hr Ultra Marathon	327.876 km	5
07.02	50km	9th Taipei 48hr Ultra Marathon - 50km Split	5:15:21 h	7
07.02	6h	9th Taipei 48hr Ultra Marathon - 6h Split	55.692 km	7
07.02	50mi	9th Taipei 48hr Ultra Marathon - 50mi Split	10:30:07 h	16
07.02	12h	9th Taipei 48hr Ultra Marathon - 12h Split	88.842 km	19
07.02	100km	9th Taipei 48hr Ultra Marathon - 100km Split	14:07:08 h	19
07.02	100mi	9th Taipei 48hr Ultra Marathon - 100mi Split	23:50:16 h	13
07.02	24h	9th Taipei 48hr Ultra Marathon - 24h Split	162.435 km	13
2019
22.11	400km	6. Okinawa Hontō survival run	2d 20:32:26 h	1 🏆
30.04	514km	15th River Road Foot Race 514 km	3d 21:42:59 h	7
02.03	100km	2nd Taiwania 100 Ultra Trail	12:52:38 h	57
15.02	48h	8th Taipei 48hr Ultra Marathon	336.955 km	4
15.02	50km	8th Taipei 48hr Ultra Marathon - 50km Split	4:50:22 h	4
15.02	6h	8th Taipei 48hr Ultra Marathon - 6h Split	61.659 km	4
15.02	50mi	8th Taipei 48hr Ultra Marathon - 50mi Split	8:03:36 h	4
15.02	100km	8th Taipei 48hr Ultra Marathon - 100km Split	11:32:54 h	14
15.02	12h	8th Taipei 48hr Ultra Marathon - 12h Split	104.091 km	11
15.02	100mi	8th Taipei 48hr Ultra Marathon - 100mi Split	21:27:50 h	13
15.02	24h	8th Taipei 48hr Ultra Marathon - 24h Split	183.651 km	8
2018
23.11	400km	5. Okinawa Hontō survival run	2d 14:27:07 h	4
10.11	24h	13th Jingu Gaien 24 Hour Challenge	177.576 km	57
15.09	250km	1st Utsukushima Fukushima Journey Run 250K	39:56:58 h	9
21.08	521km	Across Honshu R8 Foot Race	5d 10:59:00 h	1 🏆
14.07	263km	3rd Michinoku Tsugaru Journey Run 263K	39:59:36 h	11
03.06	78km	25. Ultramarathon Okumusashi	6:51:03 h	38
30.04	514km	14th River Road Foot Race 514 km	4d 19:12:09 h	21
21.04	250km	25. Sakura Michi Kokusai Nature Run	31:26:00 h	17
17.03	100km	8th Southern Cross-Island Highway 100 km Ultra Marathon	9:11:10 h	2 🥈
03.03	204km	8th Little Edo Oedo 200k	31:18:28 h	79
09.02	48h	7th Taipei 48hr Ultra Marathon	334.549 km	5
09.02	50km	7th Taipei 48hr Ultra Marathon - 50km Split	4:54:55 h	5
09.02	6h	7th Taipei 48hr Ultra Marathon - 6h Split	59.007 km	10
09.02	50mi	7th Taipei 48hr Ultra Marathon - 50mi Split	8:46:29 h	14
09.02	12h	7th Taipei 48hr Ultra Marathon - 12h Split	99.450 km	20
09.02	100km	7th Taipei 48hr Ultra Marathon - 100km Split	12:07:34 h	20
09.02	100mi	7th Taipei 48hr Ultra Marathon - 100mi Split	19:51:45 h	9
09.02	24h	7th Taipei 48hr Ultra Marathon - 24h Split	190.281 km	6
2017
23.11	400km	4. Okinawa Hontō survival run	2d 11:06:03 h	2 🥈
11.11	24h	12th Jingu Gaien 24 Hour Challenge	196.193 km	39
24.09	100km	20th Jonaizaka 100 km Ultra Marathon	10:18:00 h	5
02.07	100km	1st Nikko 100km Ultramarathon	9:11:43 h	30
30.04	520km	13th River Road Foot Race 520 km	4d 23:33:20 h	26
22.04	250km	24. Sakura Michi Kokusai Nature Run	33:04:24 h	40
08.04	70km	12th Toda Saiko 70 km	5:35:53 h	22
11.03	120km	7th Southern Cross-Island Highway 120 km Ultra Marathon	13:09:40 h	23
04.03	204km	7th Little Edo Oedo 200k	28:53:38 h	51
2016
17.12	24h	11th Jingu Gaien 24 Hour Challenge	121.902 km	123
17.07	200km	1st Michinoku Tsugaru Journey Run 200K	27:33:49 h	8
03.07	8h	22th 8-Hour Endurance Race Tokorozawa - 3 tai	81.150 km	2 🥈
12.06	100km	12th Iwate Ginga 100km Marathon Challenge	8:34:49 h	12
05.06	78km	23. Ultramarathon Okumusashi	6:19:57 h	32
30.04	520km	12th River Road Foot Race 520 km	3d 23:27:29 h	5
09.04	70km	11th Toda Saiko 70 km	5:26:30 h	5
05.03	233km	6th Little Edo Oedo 230k	27:45:46 h	5
2015
19.12	24h	10th Jingu Gaien 24 Hour Challenge	189.732 km	32
25.09	246km	33. Spartathlon	32:24:06 h	59
22.06	77km	22. Ultramarathon Okumusashi	6:33:21 h	37
14.06	100km	11th Iwate Ginga 100km Marathon Challenge	8:33:41 h	18
17.05	73km	1st Gasando Trail running race	7:51:58 h	20
30.04	520km	11th River Road Foot Race 520 km	3d 07:55:38 h	1 🏆
15.03	100km	1st Nagoura Marathon 100 km	8:20:57 h	2 🥈
28.02	203km	5th Little Edo Oedo 200k	22:31:34 h	1 🏆
2014
08.11	24h	9th Jingu Gaien 24 Hour Challenge	224.015 km	10
08.11	6h	9th Jingu Gaien 24 Hour Challenge - 6h Split	64.903 km	20
08.11	12h	9th Jingu Gaien 24 Hour Challenge -12h Split	124.509 km	16
01.11	217km	1st Setouchi Angya 2014	24:53:28 h	1 🏆
28.09	100km	24. Akita Nairiku 100km Marathon	8:55:54 h	35
14.09	142km	17th Karisakatoge beyond Chichibu Run	15:53:17 h	5
19.07	100mi	7th OSJ Ontake 100 Mile Ultra Trail	21:50:55 h	29
06.07	8h	20th 8-Hour Endurance Race Tokorozawa - 3 tai	94.134 km	1 🏆
08.06	100km	10th Iwate Ginga 100km Marathon Challenge	8:04:08 h	6
30.04	520km	10th River Road Foot Race 520 km	3d 05:36:15 h	1 🏆
18.04	250km	21. Sakura Michi Kokusai Nature Run	28:08:27 h	7
27.03	146km	1st Race Across Taiwan Nonstop 246km	19:14:00 h	9
01.03	203km	4th Little Edo Oedo 200k	23:33:04 h	3 🥉
2013
15.09	142km	16th Karisakatoge beyond Chichibu Run	15:26:40 h	2 🥈
07.09	100mi	2nd OSJ Yatsugatake Super Trail 100 miles race	23:37:02 h	6
07.07	8h	19th 8-Hour Endurance Race Tokorozawa - 3 tai	81.150 km	3 🥉
09.06	100km	9th Iwate Ginga 100km Marathon Challenge	8:11:17 h	11
02.05	250km	25. Yamaguchi 100 Hagi-O-Kan Maranic 250 km	35:01:26 h	11
19.04	250km	20. Sakura Michi Kokusai Nature Run	29:55:00 h	10
10.03	72km	1st Izu Trail Journey	8:54:49 h	74
02.03	203km	3rd Little Edo Oedo 200k	25:17:16 h	8
2012
09.12	6h	1st Coedo Kawagoe 6 Hours Run	68.840 km	4
03.11	100mi	1st OSJ Yatsugatake Super Trail 100 miles race	25:55:14 h	37
16.09	143km	15th Karisakatoge beyond Chichibu Run	18:21:14 h	17
12.08	415km	6th Trans Japan Alps Race	7d 13:45:00 h	12
10.06	100km	8th Iwate Ginga 100km Marathon Challenge	8:26:52 h	15
03.05	255km	8th River Road Foot Race 255 km	34:48:12 h	1 🏆
21.04	250km	19. Sakura Michi Kokusai Nature Run	28:22:00 h	11
03.03	203km	2nd Little Edo Oedo 200k	24:12:12 h	3 🥉
2011
06.11	50km	3rd Kanna Mountain Run II	7:25:09 h	13
02.10	50km	1st SkyView Ultra-Trail	6:50:26 h	26
18.09	143km	14th Karisakatoge beyond Chichibu Run	16:31:18 h	3 🥉
08.09	430km	Across Honshu R7 Foot Race	4d 01:59:00 h	1 🏆
07.08	77km	18. Ultramarathon Okumusashi	6:41:11 h	38
16.07	100mi	4th OSJ Ontake 100 Mile Ultra Trail	22:52:30 h	18
10.07	8h	17th 8-Hour Endurance Race Tokorozawa - 3 tai	81.150 km	5
12.06	100km	7th Iwate Ginga 100km Marathon Challenge	8:28:00 h	15
21.05	12h	1st 12 hour Tokorozawa	128.227 km	2 🥈
16.04	250km	18. Sakura Michi Kokusai Nature Run	28:43:00 h	6
05.03	203km	1st Little Edo Oedo 200k	23:56:30 h	2 🥈
2010
09.10	100km	8th Echigo Kubikino 100km Ultramarathon	9:20:04 h	49
17.09	143km	12th Karisakatoge beyond Chichibu Run	17:58:49 h	7
01.08	77km	17. Ultramarathon Okumusashi	6:56:44 h	36
04.07	8h	16th 8-Hour Endurance Race Tokorozawa - 3 tai	84.396 km	1 🏆
13.06	100km	6th Iwate Ginga 100km Marathon Challenge	9:14:33 h	24
16.05	100km	16th Yatsugatake Nobeyama 100 km	10:11:21 h	82
17.04	250km	17. Sakura Michi Kokusai Nature Run	31:08:00 h	18
2009
27.09	100km	19. Akita Nairiku 100km Marathon	8:44:04 h	19
19.09	143km	12th Karisakatoge beyond Chichibu Run	15:42:53 h	2 🥈
02.08	75km	16. Ultramarathon Okumusashi	7:13:46 h	98
19.07	100km	2nd OSJ Ontake 100km Ultra Trail	13:00:47 h	63
05.07	50km	1st OSJ Shiga Kogen Trail 50K	8:45:55 h	134
14.06	100km	5th Iwate Ginga 100km Marathon Challenge	9:03:17 h	24
17.05	100km	15th Yatsugatake Nobeyama 100 km	11:14:26 h	111
02.05	250km	21. Yamaguchi 100 Hagi-O-Kan Maranic 250 km	35:29:06 h	10
11.04	70km	4th Toda Saiko 70 km	5:45:22 h	6
2008
11.10	100km	7th Echigo Kubikino 100km Ultramarathon	9:48:24 h	75
28.09	100km	18. Akita Nairiku 100km Marathon	9:25:35 h	57
14.09	143km	11th Karisakatoge beyond Chichibu Run	17:33:45 h	6
03.08	75km	15. Ultramarathon Okumusashi	7:38:16 h	99
20.07	100km	1st OSJ Ontake 100km Ultra Trail	13:02:09 h	52
08.06	100km	4th Iwate Ginga 100km Marathon Challenge	9:17:48 h	23
03.05	140km	20. Yamaguchi 100 Hagi-O-Kan Maranic 140 km	17:33:53 h	5
2007
27.05	50km	OSJ Hakone 50K	10:54:15 h	249

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	21/8/2018	Across Honshu R8 Foot Race	521,00	×4
✓ 2	30/4/2017	13th River Road Foot Race 520 km	520,00	×4
✓ 3	30/4/2016	12th River Road Foot Race 520 km	520,00	×4
✓ 4	30/4/2015	11th River Road Foot Race 520 km	520,00	×4
✓ 5	30/4/2014	10th River Road Foot Race 520 km	520,00	×4
✓ 6	30/4/2019	15th River Road Foot Race 514 km	514,00	×4
✓ 7	30/4/2018	14th River Road Foot Race 514 km	514,00	×4
✓ 8	30/4/2021	16th River Road Foot Race 503 km	503,00	×4
✓ 9	8/9/2011	Across Honshu R7 Foot Race	430,00	×3
✓ 10	12/8/2012	6th Trans Japan Alps Race (TJAR)	415,00	×3
✓ 11	22/11/2019	6. Okinawa Hontō survival run	400,00	×3
✓ 12	23/11/2018	5. Okinawa Hontō survival run	400,00	×3
✓ 13	23/11/2017	4. Okinawa Hontō survival run	400,00	×3
✓ 14	15/2/2019	8th Taipei 48hr Ultra Marathon	336,96	×3
✓ 15	9/2/2018	7th Taipei 48hr Ultra Marathon	334,55	×2
✓ 16	7/2/2020	9th Taipei 48hr Ultra Marathon	327,88	×2
✓ 17	14/7/2018	3rd Michinoku Tsugaru Journey Run 263K	263,00	×2
✓ 18	3/5/2012	8th River Road Foot Race 255 km	255,00	×2
✓ 19	15/9/2018	1st Utsukushima Fukushima Journey Run 250K	250,00	×2
✓ 20	21/4/2018	25. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 21	22/4/2017	24. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 22	18/4/2014	21. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 23	2/5/2013	25. Yamaguchi 100 Hagi-O-Kan Maranic 250 km	250,00	×2
✓ 24	19/4/2013	20. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 25	21/4/2012	19. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 26	16/4/2011	18. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 27	17/4/2010	17. Sakura Michi Kokusai Nature Run	250,00	×2
✓ 28	2/5/2009	21. Yamaguchi 100 Hagi-O-Kan Maranic 250 km	250,00	×2
✓ 29	25/9/2015	33. Spartathlon	246,00	×2
✓ 30	5/3/2016	6th Little Edo Oedo 230k	233,00	×2
✓ 31	8/11/2014	9th Jingu Gaien 24 Hour Challenge	224,02	×2
✓ 32	1/11/2014	1st Setouchi Angya 2014	217,00	×1
✓ 33	22/2/2020	10th Little Edo Oedo 205k	206,00	×1
✓ 34	3/3/2018	8th Little Edo Oedo 200k	204,00	×1
✓ 35	4/3/2017	7th Little Edo Oedo 200k	204,00	×1
✓ 36	28/2/2015	5th Little Edo Oedo 200k	203,00	×1
✓ 37	1/3/2014	4th Little Edo Oedo 200k	203,00	×1
✓ 38	2/3/2013	3rd Little Edo Oedo 200k	203,00	×1
✓ 39	3/3/2012	2nd Little Edo Oedo 200k	203,00	×1
✓ 40	5/3/2011	1st Little Edo Oedo 200k	203,00	×1
✓ 41	17/7/2016	1st Michinoku Tsugaru Journey Run 200K	200,00	×1
✓ 42	11/11/2017	12th Jingu Gaien 24 Hour Challenge	196,19	×1
✓ 43	19/12/2015	10th Jingu Gaien 24 Hour Challenge	189,73	×1
✓ 44	10/11/2018	13th Jingu Gaien 24 Hour Challenge	177,58	×1
✓ 45	19/7/2014	7th OSJ Ontake 100 Mile Ultra Trail	160,93	×1
✓ 46	7/9/2013	2nd OSJ Yatsugatake Super Trail 100 miles race	160,93	×1
✓ 47	3/11/2012	1st OSJ Yatsugatake Super Trail 100 miles race	160,93	×1
✓ 48	16/7/2011	4th OSJ Ontake 100 Mile Ultra Trail	160,93	×1
✓ 49	27/3/2014	1st Race Across Taiwan Nonstop 246km	146,00	×1
✓ 50	16/9/2012	15th Karisakatoge beyond Chichibu Run	143,00	×1
✓ 51	18/9/2011	14th Karisakatoge beyond Chichibu Run	143,00	×1
✓ 52	17/9/2010	12th Karisakatoge beyond Chichibu Run	143,00	×1
✓ 53	19/9/2009	12th Karisakatoge beyond Chichibu Run	143,00	×1
✓ 54	14/9/2008	11th Karisakatoge beyond Chichibu Run	143,00	×1
✓ 55	14/9/2014	17th Karisakatoge beyond Chichibu Run	142,00	×1
✓ 56	15/9/2013	16th Karisakatoge beyond Chichibu Run	142,00	×1
✓ 57	3/5/2008	20. Yamaguchi 100 Hagi-O-Kan Maranic 140 km	140,00	×1
✓ 58	21/5/2011	1st 12 hour Tokorozawa	128,23	×1
✓ 59	17/12/2016	11th Jingu Gaien 24 Hour Challenge	121,90	×1
✓ 60	11/3/2017	7th Southern Cross-Island Highway 120 km Ultra Marathon	120,00	×1
✓ 61	2/3/2019	2nd Taiwania 100 Ultra Trail	100,00	—
✓ 62	17/3/2018	8th Southern Cross-Island Highway 100 km Ultra Marathon	100,00	—
✓ 63	24/9/2017	20th Jonaizaka 100 km Ultra Marathon	100,00	—
✓ 64	2/7/2017	1st Nikko 100km Ultramarathon	100,00	—
✓ 65	12/6/2016	12th Iwate Ginga 100km Marathon Challenge	100,00	—
✓ 66	14/6/2015	11th Iwate Ginga 100km Marathon Challenge	100,00	—
✓ 67	15/3/2015	1st Nagoura Marathon 100 km	100,00	—
✓ 68	28/9/2014	24. Akita Nairiku 100km Marathon	100,00	—
✓ 69	8/6/2014	10th Iwate Ginga 100km Marathon Challenge	100,00	—
✓ 70	9/6/2013	9th Iwate Ginga 100km Marathon Challenge	100,00	—
✓ 71	10/6/2012	8th Iwate Ginga 100km Marathon Challenge	100,00	—
✓ 72	12/6/2011	7th Iwate Ginga 100km Marathon Challenge	100,00	—
✓ 73	9/10/2010	8th Echigo Kubikino 100km Ultramarathon	100,00	—
✓ 74	13/6/2010	6th Iwate Ginga 100km Marathon Challenge	100,00	—
✓ 75	16/5/2010	16th Yatsugatake Nobeyama 100 km	100,00	—
✓ 76	27/9/2009	19. Akita Nairiku 100km Marathon	100,00	—
✓ 77	19/7/2009	2nd OSJ Ontake 100km Ultra Trail	100,00	—
✓ 78	14/6/2009	5th Iwate Ginga 100km Marathon Challenge	100,00	—
✓ 79	17/5/2009	15th Yatsugatake Nobeyama 100 km	100,00	—
✓ 80	11/10/2008	7th Echigo Kubikino 100km Ultramarathon	100,00	—
✓ 81	28/9/2008	18. Akita Nairiku 100km Marathon	100,00	—
✓ 82	20/7/2008	1st OSJ Ontake 100km Ultra Trail	100,00	—
✓ 83	8/6/2008	4th Iwate Ginga 100km Marathon Challenge	100,00	—
✓ 84	6/7/2014	20th 8-Hour Endurance Race Tokorozawa - 3 tai	94,13	—
85	4/7/2010	16th 8-Hour Endurance Race Tokorozawa - 3 tai	84,40	—
86	3/7/2016	22th 8-Hour Endurance Race Tokorozawa - 3 tai	81,15	—
87	7/7/2013	19th 8-Hour Endurance Race Tokorozawa - 3 tai	81,15	—
88	10/7/2011	17th 8-Hour Endurance Race Tokorozawa - 3 tai	81,15	—
89	3/6/2018	25. Ultramarathon Okumusashi	78,00	—
90	5/6/2016	23. Ultramarathon Okumusashi	78,00	—
91	22/6/2015	22. Ultramarathon Okumusashi	77,00	—
92	7/8/2011	18. Ultramarathon Okumusashi	77,00	—
93	1/8/2010	17. Ultramarathon Okumusashi	77,00	—
94	2/8/2009	16. Ultramarathon Okumusashi	75,00	—
95	3/8/2008	15. Ultramarathon Okumusashi	75,00	—
96	17/5/2015	1st Gasando Trail running race	73,00	—
97	10/3/2013	1st Izu Trail Journey	72,00	—
98	8/4/2017	12th Toda Saiko 70 km	70,00	—
99	9/4/2016	11th Toda Saiko 70 km	70,00	—
100	11/4/2009	4th Toda Saiko 70 km	70,00	—
101	9/12/2012	1st Coedo Kawagoe 6 Hours Run	68,84	—
102	6/11/2011	3rd Kanna Mountain Run II	50,00	—
103	2/10/2011	1st SkyView Ultra-Trail	50,00	—
104	5/7/2009	1st OSJ Shiga Kogen Trail 50K	50,00	—
105	27/5/2007	OSJ Hakone 50K	50,00	—