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Hey Ander,
Yeah that’s perfect, that’s exactly what we are looking for when looking to improve an athlete’s aerobic capacity. If I understand correctly:
Test 1: March 2024, 164 BPM, 3.5% drift
Test 2: February 2025, 168 BPM, 2.3% drift
Your aerobic capacity has significantly increased. You should retest at 172 BPM and aim for a test with 3.5-5% drift. The lower the starting heart rate and/or the greater the aerobic capacity, the lower the drift. Keep in mind that nasal breathing is usually a pretty conservative estimate for LT1/AeT. Nasal breathing for me stops around 125 but my AeT is around 155. Let me know if you have any other questions.