Understanding Garmin Sleep Stress: What Those Orange Bars Actually Mean

Garmin Sleep Metrics screen showing 51 restless moments, 55 bpm RHR, and a low SpO2 dip of 83%.

Garmin Sleep Stress: What Those Orange Bars Actually Mean As a cycling coach, I’m constantly preaching the “Physiology First” gospel: listen to the engine, not just the dashboard. But lately, I’ve been my own most difficult athlete. I’ve been analyzing my Garmin Sleep Stress while deep in the trenches of “outdoor mania” labor. While the […]

Threshold or VO2 Max? Decoding My Highest 30-Minute Power with AlphaHRV and SmO2

Graph showing SmO2 muscle oxygenation decline and heart rate drift during 30 minutes of cycling threshold intervals.

Training is rarely perfect, especially when I am wearing two hats at once. Today’s session was a 30-minute block of 3/3 Over-Unders—three minutes just above threshold wattage, followed by three minutes at 95% of FTP. I designed this session to challenge the metabolic limits of my oxidative system through focused SmO2 threshold training while staying […]

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 […]

Decoding the Flux: How the Reverse Fibonacci Protocol Re-Maps Your Threshold

Stacked line graphs showing physiological data from a Reverse Fibonacci cycling workout, including power output, heart rate, SmO2 desaturation, and VO2 plateaus across 8, 5, 3, 2, and 1-minute intervals.

    Beyond the Score The Garmin Guru Series | Decoding the Fast-Adapter | By OnlineBikeCoach.com Programming Reverse Fibonacci intervals is the ultimate way to shatter the lie of the “Static Zone” in high-performance cycling. We move past the idea that a single FTP test or a heart rate formula from a 1980s textbook is […]

Physiology First: Navigating a “Red Light” Morning with AlphaHRV

Screenshot of a Garmin HRV Stress test showing a high stress score of 75.

    Physiology First: My Red Light Recovery Ride This morning was a masterclass in why I apply a Physiology First framework to every session, looking at the internal engine before I look at the wattage. Between a late meal and the devastating news about my friend Murray being struck by a motorist—suffering a serious […]

Decoding the Hard-Start: How Ronnestad Intervals Impact Garmin Stamina & Training Effect

A dual-axis line graph showing a tight-scale view of Stamina (%) and Heart Rate (bpm) during three 10-minute intervals.

The “Hard-Start” Evolution: Pushing the Limits of the Rønnestad Protocol Testing the Ronnestad Hard-Start Intervals protocol this week provided a fascinating look at oxygen kinetics and internal load. Before this session, I attempted to link my VO2 Master to the phone for a full metabolic calibration. Despite several attempts, the mask simply wouldn’t handshake. Rather […]

VO₂max Intervals: The Most Misunderstood Workout in Cycling—And How to Do Them “Right”

VO2Max State Vs. Zone Analysis: A Physiological graph of Interval 5 showing maximal cardiac strain (178 bpm), rock-bottom SmO2, and a 74-second metabolic penalty above 42 VO2.

VO2Max State vs. Zone: What’s Happening Under the Hood https://youtube.com/shorts/gjB6seZEVec?feature=share   I recently started using my VO₂Master again. In this session, I wanted to explore the VO2max state vs zone debate by looking at the actual physiological cost of high-intensity efforts. Earlier this week, I performed five separate 3-minute intervals at an intensity well above […]

The Road to 300 Watts FTP

Moxy DFAA-1 Vo2master PerfPro Studio

Right Now, It’s NOT about 300 Watts; It’s About Raising LOWER THRESHOLD

The goal of base is to train the body for Economy. Stamina is the fundamental Pillar for Polarized Training. When you train using DFAA-1, you can get a clearer picture of how your body is responding to the training. Wattage and traditional heart rate become

What Does All The Data Say??

Look at the Muscle oxygen picture, the vo2max picture, the watts, the heart rate, the respiration rate, all of it.

We Have to Look at the Holistic Picture. I’ve been a Cycling Coach since September of 1993. I started with pace, then heart rate. In 1995 I bought my first CompuTrainer, and learned about LOAD. In 1998, I owned the world’s first TUNE powertap built for mountain bike rear wheel spacing. In 2004, I bought […]