Kazuyoshi (石川和芳) Ishikawa

Born : 1957 Cat. M65 Ultrarunner since 2014

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

45,6%

Rank quotient ?This runner's calculation uses 17 eligible race(s): Σ(rank − 1) = 4 765; Σ finishers = 10 445. 4 765 / 10 445 × 100 = 45.62%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed18

Km — ultra races1 337 km

> 100 km1

Longest race129,0 km

3rd SkyView Ultra-Trail 120 - Yamada Noboru Memorial Cup — 11/9/2016

Km per year (ultra races)

142

2022

2023

2024

2025

2026

Race types (share of distance)

Road43,4%

Trail50,6%

Stage6,0%

Records

100 km17h37'19 6 h60,50 km

HISTORY

18 race(s)

Date		Race	Perf.	Rk
2024
13.04	71km	19th Toda Saiko 70 km	8:10:07 h	105
2022
03.07	8h	28th 8-Hour Endurance Race Tokorozawa	63.700 km	86
05.06	78km	29. Ultramarathon Okumusashi	8:36:37 h	237
2019
16.03	80km	7th Arakawa Riverside Journey Stage Race - Stage 1	9:12:11 h	23
23.02	91km	9th Little Edo 91km	11:42:36 h	22
2018
29.09	6h	7th Coedo Kawagoe Running Fest 6-hours run	60.500 km	7
30.06	8h	24th 8-Hour Endurance Race Tokorozawa	63.700 km	65
2017
10.09	51.4km	7th Hakuba Int. Trail Run	7:33:14 h	286
15.07	100km	10th OSJ Ontake 100km Ultra Trail	17:37:19 h	717
25.06	72.7km	4. Spatrail - Shima to Kusatsu	11:41:00 h	367
04.06	78km	24. Ultramarathon Okumusashi	8:41:57 h	374
2016
09.10	71.5km	24th Hasetsune Cup - Japan Mountain Endurance Race	18:29:29 h	1227
11.09	129km	3rd SkyView Ultra-Trail 120 - Yamada Noboru Memorial Cup	34:14:52 h	373
26.06	72.7km	3. Spatrail - Shima to Kusatsu	11:16:12 h	244
2015
13.09	53km	5th Hakuba Int. Trail Run	7:27:34 h	170
28.06	72.7km	2. Spatrail - Shima to Kusatsu	11:38:06 h	263
2014
14.09	53km	4th Hakuba Int. Trail Run	8:05:38 h	201
06.07	8h	20th 8-Hour Endurance Race Tokorozawa	74.658 km	38

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	11/9/2016	3rd SkyView Ultra-Trail 120 - Yamada Noboru Memorial Cup	129,00	×4
✓ 2	15/7/2017	10th OSJ Ontake 100km Ultra Trail	100,00	×3
✓ 3	23/2/2019	9th Little Edo 91km	91,00	×2
✓ 4	5/6/2022	29. Ultramarathon Okumusashi	78,00	×2
✓ 5	4/6/2017	24. Ultramarathon Okumusashi	78,00	×2
✓ 6	6/7/2014	20th 8-Hour Endurance Race Tokorozawa	74,66	×2
✓ 7	25/6/2017	4. Spatrail - Shima to Kusatsu	72,70	×2
✓ 8	26/6/2016	3. Spatrail - Shima to Kusatsu	72,70	×2
✓ 9	28/6/2015	2. Spatrail - Shima to Kusatsu	72,70	×2
✓ 10	9/10/2016	24th Hasetsune Cup - Japan Mountain Endurance Race	71,50	×2
✓ 11	13/4/2024	19th Toda Saiko 70 km	71,00	×2
✓ 12	3/7/2022	28th 8-Hour Endurance Race Tokorozawa	63,70	×2
✓ 13	30/6/2018	24th 8-Hour Endurance Race Tokorozawa	63,70	×2
✓ 14	29/9/2018	7th Coedo Kawagoe Running Fest 6-hours run	60,50	×1
✓ 15	13/9/2015	5th Hakuba Int. Trail Run	53,00	×1
✓ 16	14/9/2014	4th Hakuba Int. Trail Run	53,00	×1
✓ 17	10/9/2017	7th Hakuba Int. Trail Run	51,40	×1