Masaaki (岩崎正昭) Iwasaki
ID 174128
Born : 1961 Cat. M65 Ultrarunner since 2000 JPN
31
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
50
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
1
Countries visited ?JPNJapan
18,1%
Rank quotient ?This runner's calculation uses 31 eligible race(s): Σ(rank − 1) = 7 045; Σ finishers = 38 998. 7 045 / 38 998 × 100 = 18.07%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed31
Km — ultra races2 900 km
Longest race100,0 km
38. Lake Saroma 100 km Ultramarathon — 25/6/2023

Km per year (ultra races)

60
1 race
2022
100
1 race
2023
2024
2025
2026

Race types (share of distance)

Road100,0%

Records

100 km8h40'26

HISTORY

31 race(s)
DateRacePerf.Rk
2023
25.06 100km JPN38. Lake Saroma 100 km Ultramarathon 12:03:01 h1046
2022
15.05 60km JPN8th Ishigaki Island Ultra Marathon 6:47:25 h42
2019
30.06 100km JPN34. Lake Saroma 100 km Ultramarathon 11:23:19 h948
12.05 60km JPN5th Ishigaki Island Ultra Marathon 7:41:04 h61
2018
13.05 60km JPN4th Ishigaki Island Ultra Marathon 6:26:15 h15
2016
26.06 100km JPN31. Lake Saroma 100 km Ultramarathon 8:53:51 h164
15.05 60km JPN2nd Ishigaki Island Ultra Marathon 5:54:22 h7
17.01 100km JPN26th Miyako 100 km Ultramarathon 10:49:19 h58
2015
28.06 100km JPN30. Lake Saroma 100 km Ultramarathon 9:16:34 h239
17.05 60km JPN1st Ishigaki Island Ultra Marathon 7:13:54 h35
11.01 100km JPN25th Miyako 100 km Ultramarathon 9:33:50 h31
2014
29.06 100km JPN29. Lake Saroma 100 km Ultramarathon 10:30:14 h340
2013
20.10 100km JPN19th River Shimanto 100km 9:03:27 h47
30.06 100km road race JPN28. Lake Saroma 100 km Ultramarathon 8:47:56 h91
2012
24.06 100km road race JPN27. Lake Saroma 100 km Ultramarathon 8:50:52 h116
2011
16.10 100km JPN17th River Shimanto 100km 8:40:26 h25
26.06 100km road race JPN26. Lake Saroma 100 km Ultramarathon 8:49:48 h92
2010
27.06 100km JPN25. Lake Saroma 100 km Ultramarathon 10:11:19 h272
2009
18.10 100km JPN15th River Shimanto 100km 10:20:32 h157
2008
19.10 100km JPN14th River Shimanto 100km 10:27:50 h144
2007
14.10 100km JPN13th River Shimanto 100km 10:25:26 h162
24.06 100km JPN22. Lake Saroma 100 km Ultramarathon 10:16:50 h389
2006
15.10 100km JPN12th River Shimanto 100km 10:32:30 h168
25.06 100km JPN21. Lake Saroma 100 km Ultramarathon 10:12:09 h284
2005
16.10 100km JPN11th River Shimanto 100km 11:31:26 h343
26.06 100km JPNOpen Race at IAU 100km WC Yubetsu (20. Lake Saroma 100 km Ultramarathon) 10:40:14 h431
2004
17.10 100km JPN10th River Shimanto 100km 11:54:35 h456
2003
19.10 100km JPN9th River Shimanto 100km 11:45:03 h446
2002
26.05 100km JPN9th Ebisu-Daikoku 100 km Marathon 11:24:48 h37
2001
21.10 100km JPN8th River Shimanto 100km 11:07:30 h209
2000
15.10 100km JPN7th River Shimanto 100km 11:17:11 h221