// EVENT DEFINITION
DISTANCE
1609.344 meters (1 statute mile)
CLASSIFICATION
Middle-distance running event
SPORT
Athletics (Track & Field)
CURRENT RECORD
3:43.17 (Josh Kerr, 2026)
RECORD VELOCITY
37.89× baseline interest (live spike)
Context: July 18, 2026. Josh Kerr of Britain broke the 27-year world record. The galaxy's attention velocity spiked 37.89× normal. This protocol maps the performance envelope that enabled the breakthrough.
// PHYSIOLOGICAL PARAMETERS
| PARAMETER | VALUE | SOURCE |
|---|---|---|
| Average Pace | 55.4 sec/km | Kerr 2026 split analysis |
| VO₂ Max Requirement | ≥ 85 ml/kg/min | Elite middle-distance threshold |
| Lactate Threshold | ≈ 85% VO₂ max sustained | Sub-4-minute physiology |
| Running Economy | ≤ 195 ml O₂/kg/km | World-class efficiency |
| Critical Speed | ≈ 20.1 km/h | 3:43.17 pace equivalent |
These parameters define the boundary condition. Any athlete attempting sub-4-minute territory must meet or exceed all five thresholds simultaneously. One weakness collapses the run.
// TRACK GEOMETRY
STANDARD LANE LENGTH
400 meters (inner lane)
MILE LAP COUNT
4 laps + 9.344 meters
SURFACE COEFFICIENT
Tartan/Mondo synthetic (μ ≈ 0.7)
TURN RADIUS
36.5 meters (standard oval)
Surface friction and turn geometry contribute measurable drag. Lane 1 minimizes distance but maximizes centrifugal force. Elite runners optimize lane choice based on wind conditions and fatigue state.
// PERFORMANCE HISTORY (SELECTED)
| DATE | RUNNER | TIME | LOCATION |
|---|---|---|---|
| 1999 | Hicham El Guerrouj | 3:43.13 | Rome, Italy |
| 2026 | Josh Kerr | 3:43.17 | Birmingham, UK |
| 1999 | Nawal Kherbib | 4:12.56 | Paris, France |
Record progression is not linear. The 27-year stagnation between 1999 and 2026 represents a physiological ceiling that required new training paradigms to breach. Kerr's 0.04-second margin proves the envelope is still expanding.
// PROTOCOL APPLICATION
This protocol extends the 14-week ledger methodology to human performance systems. Just as colony hardware requires exact metrics (ΔT=12.4K, pump head=847psi), elite running demands exact physiological constants.
Cross-reference: The Golden Seam protocol teaches that one failed pin collapses the chain. Here, one failed parameter (VO₂ max, lactate clearance, running economy) collapses the record attempt.
Agent-legible twin: mile-run-protocol.json contains all constants in machine-readable format for simulation and validation.