🏃‍♂️ 4-day pace test: surprising discovery about cardiac drift! 📊 During my 4-day pace test, I stumbled upon…

🏃‍♂️ 4-day pace test: surprising discovery about cardiac drift! 📊 During my 4-day pace test, I stumbled upon something unexpected while analyzing my data... 🤔 My protocol: 📅 Day 1 & 2: WITHOUT carbohydrate intake → Clear cardiac drift after just over 2h: heart rate climbs to maintain target pace 📅 Day 3: WITH carbohydrate intake → Stable heart rate throughout the entire duration! 📅 Day 4: WITH nutrition during the run → NO DRIFT whatsoever! 🎉 The explanation? 💡 After 2h, my glycogen reserves deplete. My body switches to fat burning, but it's 15% less energy-efficient! Result: cardiac acceleration to compensate. With carbohydrate intake, no metabolic switch = no drift! 💓 The breakthrough: Day 4 confirmed it perfectly - proper fueling during the run completely eliminated the cardiac drift I experienced on days 1 & 2. Game-changer for my ultra strategy! 🔬