Jan-W. van Alfen
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Born : 1939
Cat. M85 Ultrarunner since 1971
10
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
28
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
3
Countries visited ?
GermanyNetherlands
Switzerland
GermanyNetherlandsSwitzerland51,4%
Rank quotient ?This runner's calculation uses 10 eligible race(s): Σ(rank − 1) = 5 381; Σ finishers = 10 469. 5 381 / 10 469 × 100 = 51.40%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed10
Km — ultra races950 km
Longest race100,0 km
4. 100 km Gehen Hamm — 17/10/1981
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road63,2%
Trail21,1%
Ult.Walk15,8%
Wins & podiums (ultra)
🏆 Win0
🏆 Win M0
🏅 Top 30
🏅 Top 3 M1
Longest winning streak0
Current streak0
Records
HISTORY
10 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 1983 | ||||
| 14.05 | 50km | Sint Oedenrode Wandelevenement - 50km „Wedstrijd“ |
7:18:10 h | 4 |
| 1981 | ||||
| 17.10 | 100km | 4. 100 km Gehen Hamm |
14:06:55 h | 11 |
| 1977 | ||||
| 10.06 | 100km road race | 19. 100 km Lauf Biel |
17:51:00 h | 1767 |
| 1976 | ||||
| 31.10 | 100km | 1. 100-km-Lauf Hamm-Heessen |
13:45:37 h | 85 |
| 04.09 | 100km | 8. 100 km Lauf Unna |
17:05:06 h | 440 |
| 1975 | ||||
| 06.09 | 100km | 7. 100 km Lauf Unna |
16:13:54 h | 399 |
| 13.06 | 100km road race | 17. 100 km Lauf Biel |
15:48:00 h | 1045 |
| 1973 | ||||
| 08.09 | 100km | 5. 100 km Lauf Unna |
15:04:41 h | 424 |
| 15.06 | 100km road race | 15. 100 km Lauf Biel |
16:41:00 h | 932 |
| 1971 | ||||
| 04.09 | 100km | 3. 100 km Lauf Unna |
14:14:16 h | 284 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 17/10/1981 | 4. 100 km Gehen Hamm | 100,00 | ×3 |
| ✓ 2 | 10/6/1977 | 19. 100 km Lauf Biel (SUI) | 100,00 | ×3 |
| ✓ 3 | 31/10/1976 | 1. 100-km-Lauf Hamm-Heessen | 100,00 | ×3 |
| ✓ 4 | 4/9/1976 | 8. 100 km Lauf Unna | 100,00 | ×3 |
| ✓ 5 | 6/9/1975 | 7. 100 km Lauf Unna | 100,00 | ×3 |
| ✓ 6 | 13/6/1975 | 17. 100 km Lauf Biel (SUI) | 100,00 | ×3 |
| ✓ 7 | 8/9/1973 | 5. 100 km Lauf Unna | 100,00 | ×3 |
| ✓ 8 | 15/6/1973 | 15. 100 km Lauf Biel (SUI) | 100,00 | ×3 |
| ✓ 9 | 4/9/1971 | 3. 100 km Lauf Unna | 100,00 | ×3 |
| ✓ 10 | 14/5/1983 | Sint Oedenrode Wandelevenement - 50km „Wedstrijd“ | 50,00 | ×1 |