Naoya (山崎直哉) Yamazaki
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Ultrarunner since 2017
6
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
17
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
Japan63,0%
Rank quotient ?This runner's calculation uses 6 eligible race(s): Σ(rank − 1) = 837; Σ finishers = 1 329. 837 / 1 329 × 100 = 62.98%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed6
Km — ultra races332 km
Longest race62,0 km
13th Tojinbo 62 km Ultramarathon — 31/5/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road100,0%
Records
No record for a classic ultra format
HISTORY
6 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2025 | ||||
| 31.05 | 62km | 13th Tojinbo 62 km Ultramarathon |
8:22:02 h | 122 |
| 2024 | ||||
| 25.05 | 62km | 12th Tojinbo 62 km Ultramarathon |
9:00:41 h | 159 |
| 2022 | ||||
| 28.05 | 52km | 10th Tojinbo 52 km Ultramarathon |
8:39:06 h | 147 |
| 2019 | ||||
| 25.05 | 52km | 8th Tojinbo 52 km Ultramarathon |
9:46:20 h | 156 |
| 2018 | ||||
| 26.05 | 52km | 7th Tojinbo 52 km Ultramarathon |
8:52:17 h | 114 |
| 2017 | ||||
| 27.05 | 52km | 6th Tojinbo 52 km Ultramarathon |
9:26:15 h | 145 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 31/5/2025 | 13th Tojinbo 62 km Ultramarathon | 62,00 | ×3 |
| ✓ 2 | 25/5/2024 | 12th Tojinbo 62 km Ultramarathon | 62,00 | ×3 |
| ✓ 3 | 28/5/2022 | 10th Tojinbo 52 km Ultramarathon | 52,00 | ×3 |
| ✓ 4 | 25/5/2019 | 8th Tojinbo 52 km Ultramarathon | 52,00 | ×3 |
| ✓ 5 | 26/5/2018 | 7th Tojinbo 52 km Ultramarathon | 52,00 | ×3 |
| ✓ 6 | 27/5/2017 | 6th Tojinbo 52 km Ultramarathon | 52,00 | ×3 |