Online Bike Coach

Sign Up

Tag: Garmin Performance Condition

Draining the Voltmeter: A 5 AM Lesson in Under-Fueling and Autonomic Collapse

An illustration of a voltmeter-style gauge labeled "PERFORMANCE CONDITION." A needle points to the far right, well into the green "POSITIVE VO2" zone, indicating optimal energy and a stable physiological system. Two summary boxes below define the negative red and positive green states.

Forget Your Software’s Threshold: Your Physiology Rewrites the Rules in Real Time We’ve all been conditioned to treat our threshold like a monument carved in stone. Your bike computer, your smartwatch, or your coaching software gives you a single, static number—say, a functional threshold power (FTP) of 250W or a threshold heart rate of 162 […]

Garmin Guru Deep Dive: Decoding the Internal Response to 4-Minute VO2max Intervals

A consolidated physiological data graph of a 5x4 minute VO2max cycling session, showing overlapping data for VO2 consumption, Moxy SmO2 (muscle oxygenation), heart rate, and power output.

Garmin Guru Deep Dive: Decoding the Internal Response to 4-Minute VO2max Intervals Today’s session of 4-minute VO2max intervals was a masterclass in why I lead with physiology, not physics. As the Garmin Guru at Online Bike Coach, I’m constantly looking for the “truth” behind the numbers. Today, that truth was found in gas exchange and […]