Apr 30 – May 2, 2026 · Garmin Edge · 63.5 kg · 10,824m climbing
TSS 2,332 · NP 191W · IF 0.637 · VI 0.985 · CdA ≈0.42 m²
What this tells you: Your 5-min power of 411W and 10-min of 379W show strong short-duration punch. The 1-hour MMP of 242W after 47 hours of racing is particularly impressive — you were still able to sustain near-ceiling aerobic output at the very end. The 2-hour MMP of 235W confirms this wasn't a one-off spike.
Where to improve: Your estimated CdA of ~0.42 m² is on the higher side for a competitive cyclist (elite TT riders achieve 0.18–0.25 m²). Even modest aero improvements — a lower handlebar position, aero helmet, or tighter jersey — could save 15–25 min over this distance at your average speed. This is your largest single performance lever.
Elite-level cardiac response: Negative aerobic decoupling of –7.0% means your heart was working less for the same power output in the second half of the race. This is the cardiovascular system adapting in real time — stroke volume increasing, cardiac efficiency rising. It's the opposite of what happens in underprepared athletes (who show +10–20% decoupling). This is your strongest physiological signature in this dataset.
Weather impact summary: The race conditions were broadly favourable — mostly clear skies, light winds averaging 5–8 km/h. The most significant environmental stressor was the temperature swing: from near-freezing in the early hours of May 1 to 26°C by afternoon. Your HR data shows a clear thermoregulatory response: power held steady but HR climbed 6–8 bpm during the hot afternoon (hours 26–30), representing ~4% extra cardiac cost from heat. Pre-cooling strategy and aggressive hydration at those hours would directly reduce race time.
Terrain efficiency observation: On descents (negative gradient), your power drops to near zero — appropriate for recovery. However, speed data suggests you may be leaving time on descents: average descent speed of ~38 km/h is conservative for a race winner. Descending at higher confidence (braking later, higher lean angles) is a technical skill that could save 20–40 min over this course.
Biomechanical read: Starting balance of ~51.5L/48.5R (mild left dominance) is normal and stable through the race mid-section, with a slight drift in the final third — consistent with accumulated left-leg fatigue rather than injury compensation. No dramatic asymmetric spikes occurred, confirming no acute biomechanical breakdown. To improve: single-leg drills targeting right-leg independent strength could bring balance closer to 50/50 from the start, preserving more capacity in the dominant leg for the final hours.
✅ Aerobic decoupling –7.0% — your cardiovascular system became more efficient as the race progressed. This is elite-tier physiological resilience. Most athletes show positive decoupling (HR rising for same power) after hour 20. You did the opposite.
✅ Variability Index 0.985 — NP/AP ratio of 0.985 means your power delivery was extraordinarily smooth. Ultra-even pacing like this minimises glycogen depletion spikes, which is the primary cause of late-race "bonking." This was a masterclass in power management.
✅ 90.6% moving efficiency — only 4.5 hours off the bike in 48 hours. Self-supported race management was near-optimal. Every stop was brief and purposeful.
✅ Full neuromuscular recruitment at finish — peak 476W sprint at the finish confirms no central fatigue-induced power cap. You crossed the line with reserves. That's race management, not luck.
⚠️ Estimated CdA ~0.42 m² — significantly above optimal. At 27 km/h average speed, aerodynamic drag accounts for ~85% of resistance. Reducing CdA from 0.42 to 0.35 would theoretically save ~35W for the same speed — translating to roughly 2–3 hours faster over this distance. A bike fit session focused on frontal area reduction is the highest-leverage intervention available.
⚠️ Night-time power drop –11W — power fell from 198W (day) to 187W (night), likely a combination of reduced arousal, cooler temps, and visibility constraints. Structured night-riding training blocks would help maintain output levels across the circadian dip.
⚠️ Heat-induced cardiac cost — HR rose 6–8 bpm in the hottest afternoon hours (26°C+) without a corresponding power increase. Pre-cooling protocols (ice vests, cold fluid ingestion) in the 30 min before those segments would reduce this thermoregulatory overhead.