Junji (柴崎淳二) Shibazaki
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Born : 1971
Cat. M55 Ultrarunner since 2016
10
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
27
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 ?Japan
Japan29,7%
Rank quotient ?This runner's calculation uses 10 eligible race(s): Σ(rank − 1) = 3 880; Σ finishers = 13 070. 3 880 / 13 070 × 100 = 29.69%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed10
Km — ultra races902 km
Longest race100,0 km
41. Lake Saroma 100 km Ultramarathon — 28/6/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road100,0%
Records
HISTORY
10 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 28.06 | 100km | 41. Lake Saroma 100 km Ultramarathon |
8:39:31 h | 133 |
| 31.05 | 100km | 1st Nara Ultra Marathon |
13:31:15 h | 1346 |
| 2025 | ||||
| 08.06 | 100km | 13th Hida Takayama 100 km Ultramarathon |
9:51:28 h | 107 |
| 2024 | ||||
| 30.06 | 100km | 39. Lake Saroma 100 km Ultramarathon |
9:13:40 h | 129 |
| 2023 | ||||
| 11.06 | 100km | 17th Iwate Ginga 100km Marathon Challenge |
10:27:24 h | 80 |
| 2022 | ||||
| 03.07 | 8h | 28th 8-Hour Endurance Race Tokorozawa |
63.700 km | 72 |
| 2021 | ||||
| 04.07 | 8h | 27th 8-Hour Endurance Race Tokorozawa |
68.600 km | 145 |
| 10.04 | 70km | 16th Toda Saiko 70 km |
6:25:51 h | 92 |
| 2019 | ||||
| 09.06 | 100km | 8th Hida Takayama 100 km Ultramarathon |
12:51:05 h | 1106 |
| 2016 | ||||
| 05.06 | 100km | 4th Tokyo Shibamata 100 km |
12:34:20 h | 680 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 28/6/2026 | 41. Lake Saroma 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 2 | 31/5/2026 | 1st Nara Ultra Marathon | 100,00 | ×3 |
| ✓ 3 | 8/6/2025 | 13th Hida Takayama 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 4 | 30/6/2024 | 39. Lake Saroma 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 5 | 11/6/2023 | 17th Iwate Ginga 100km Marathon Challenge | 100,00 | ×3 |
| ✓ 6 | 9/6/2019 | 8th Hida Takayama 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 7 | 5/6/2016 | 4th Tokyo Shibamata 100 km | 100,00 | ×3 |
| ✓ 8 | 10/4/2021 | 16th Toda Saiko 70 km | 70,00 | ×2 |
| ✓ 9 | 4/7/2021 | 27th 8-Hour Endurance Race Tokorozawa | 68,60 | ×2 |
| ✓ 10 | 3/7/2022 | 28th 8-Hour Endurance Race Tokorozawa | 63,70 | ×2 |