Ryouko (関涼子) Seki

Ultrarunner since 2003

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

South Korea

71,2%

Rank quotient ?This runner's calculation uses 19 eligible race(s): Σ(rank − 1) = 654; Σ finishers = 919. 654 / 919 × 100 = 71.16%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed19

Km — ultra races2 282 km

> 100 km8

> 160 km5

> 200 km1

> 24h4

Longest race240,0 km

2nd Osaka Bay 240km — 11/6/2004

Km per year (ultra races)

2022

2023

2024

2025

2026

Race types (share of distance)

Road95,6%

Trail4,4%

Wins & podiums (ultra)

🏆 Win0

🏆 Win F6

🏅 Top 31

🏅 Top 3 F9

Longest winning streak0

Current streak0

Records

100 km13h15'39 6 h59,00 km 24 h121,27 km

HISTORY

19 race(s)

Date		Race	Perf.	Rk
2009
10.04	190km	9th Taiyou No Michi 190km	39:05:00 h	14
2008
04.10	24h	11. Hiratsuka 24 hour race	121.268 km	30
05.07	24h	3rd Jingu Gaien 24 Hour Challenge	120.888 km	39
2007
22.12	24h	2nd Jingu Gaien 24 Hour Challenge	96.798 km	29
07.10	100km	7th Ancient Ways Nara - Kyoto 100 km Excursion	15:49:00 h	26
2006
08.10	100km	6th Ancient Ways Nara - Kyoto 100 km Excursion	15:44:00 h	35
30.09	100km	9th Muraoka 100 km Ultra Marathon	13:50:52 h	125
25.06	100km	6th Nichinan Orochi 100 km Marathon	13:15:39 h	222
07.04	190km	6th Taiyou No Michi 190km	38:30:00 h	11
22.01	6h	13th Challenge Marathon in Nagai - 6 hours run	56.200 km	4
2005
29.10	100km	5th Ancient Ways Nara - Kyoto 100 km Excursion	14:32:14 h	18
08.04	190km	5th Taiyou No Michi 190km	38:48:00 h	25
12.03	200km	4th Jeju-do around 200 km	33:27:00 h	43
23.01	6h	12th Challenge Marathon in Nagai - 6 hours run	56.200 km	4
2004
19.06	24h	3rd Refreshing - 24h	105.000 km	3 🥉
11.06	240km	2nd Osaka Bay 240km	45:23:00 h	13
29.05	100km	4th Ancient Ways Nara - Kyoto 100 km Excursion	15:28:29 h	21
2003
20.12	6h	7th Christmas Charity Run in Nagai	59.000 km	7
29.11	6h	11th Challenge Marathon in Nagai - 6 hours run	56.200 km	4

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	11/6/2004	2nd Osaka Bay 240km	240,00	×5
✓ 2	12/3/2005	4th Jeju-do around 200 km	200,00	×4
✓ 3	10/4/2009	9th Taiyou No Michi 190km	190,00	×4
✓ 4	7/4/2006	6th Taiyou No Michi 190km	190,00	×4
✓ 5	8/4/2005	5th Taiyou No Michi 190km	190,00	×4
✓ 6	4/10/2008	11. Hiratsuka 24 hour race	121,27	×2
✓ 7	5/7/2008	3rd Jingu Gaien 24 Hour Challenge	120,89	×2
✓ 8	19/6/2004	3rd Refreshing - 24h	105,00	×2
✓ 9	7/10/2007	7th Ancient Ways Nara - Kyoto 100 km Excursion	100,00	×2
✓ 10	8/10/2006	6th Ancient Ways Nara - Kyoto 100 km Excursion	100,00	×2
✓ 11	30/9/2006	9th Muraoka 100 km Ultra Marathon	100,00	×2
✓ 12	25/6/2006	6th Nichinan Orochi 100 km Marathon	100,00	×2
✓ 13	29/10/2005	5th Ancient Ways Nara - Kyoto 100 km Excursion	100,00	×2
✓ 14	29/5/2004	4th Ancient Ways Nara - Kyoto 100 km Excursion	100,00	×2
✓ 15	22/12/2007	2nd Jingu Gaien 24 Hour Challenge	96,80	×2
✓ 16	20/12/2003	7th Christmas Charity Run in Nagai	59,00	×1
✓ 17	22/1/2006	13th Challenge Marathon in Nagai - 6 hours run	56,20	×1
✓ 18	23/1/2005	12th Challenge Marathon in Nagai - 6 hours run	56,20	×1
✓ 19	29/11/2003	11th Challenge Marathon in Nagai - 6 hours run	56,20	×1