Henk Zijlstra
External sources
Loading FFA
Loading MV
FFA diagnostics
Run “Search / refresh FFA” to see each season, HTTP response, candidate and DUV comparison.
MarathonView diagnostics
Run “Refresh MV” to see login, session validation and parser status.
Cached locally. Empty refreshes never erase the last valid snapshot.
Born : 1962
Cat. M60 Ultrarunner since 2005
2
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
12
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 ?Netherlands
Netherlands63,7%
Rank quotient ?This runner's calculation uses 2 eligible race(s): Σ(rank − 1) = 211; Σ finishers = 331. 211 / 331 × 100 = 63.75%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed2
Km — ultra races160 km
Longest race100,0 km
30. IAU 100km EC Winschoten — 10/9/2005
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road62,5%
Trail37,5%
Records
HISTORY
2 race(s) · 1 split(s) nested| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2005 | ||||
| 10.09 | 100km | 30. IAU 100km EC Winschoten |
10:05:11 h | 96 |
| 10.09 | 50km | 30. IAU 100km EC Winschoten - 50km Split | 4:31:29 h | 89 |
| 28.03 | 60km | 8e De Zestig van Texel |
5:45:47 h | 117 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 10/9/2005 | 30. IAU 100km EC Winschoten | 100,00 | ×8 |
| ✓ 2 | 28/3/2005 | 8e De Zestig van Texel | 60,00 | ×5 |