Why Your “Free” Garmin Metrics are More Accurate Than You Realize

Garmin Edge post-ride analysis showing Aerobic Training Effect of 5.0 and 72-hour recovery time.

Why Your “Free” Garmin Metrics are More Accurate Than You Realize When athletes ask about Garmin VO2 Max accuracy, they are usually skeptical about whether a consumer wearable can truly measure the high-octane reality of a 15-15 interval set. On paper, today’s session was a classic builder—two sets of 15-minute micro-intervals—but as a physiology-first coach, […]

Life Stress is Training Stress: Navigating the 52-Hour Recovery Debt

Garmin HRV stress score screen showing 94 (Very High Stress), indicating extreme systemic exhaustion and sympathetic nervous system dominance.

Garmin Recovery Metrics: When “Life Stress” Becomes a Physiological Debt Coach Richard Wharton Published: May 11, 2026 Understanding your Garmin recovery metrics is the only way to stay objective when non-training stress starts to bleed into your performance. Following our May 5th deep-dive into what those orange bars actually mean during sleep, today I’m showing […]

Billat 30-30 Physiology: Using SmO2 and ThB to Identify True VO2max Stimulus

Comparison of SmO2 resaturation capacity in early vs. late Billat intervals showing the failure of muscle re-oxygenation.

Billat 30-30 Physiology: Why Garmin Stamina Contradicts the SmO2 Test By Coach Wharton April 29, 2026 Billat 30-30 Physiology is a foundational concept in high-intensity training, typically involving 30 seconds of maximal aerobic power followed by 30 seconds of active recovery. The goal is simple on paper—spend as much time as possible at VO2max intensity. […]

The Half-Glass Difference: How Alcohol Sabotages Your Garmin Recovery

A glass of red wine on a dinner table at an upscale restaurant, representing the setting for a physiological case study on recovery.

When analyzing Garmin sleep recovery, alcohol is often the “X-factor” that derails even the most disciplined athlete. We’ve all heard it before: “It was just a couple of glasses of wine.” But as a coach who lives by the mantra Physiology is King, I’m less interested in what the menu says and more interested in […]

98% Charged: The +61 Garmin Body Battery Bounce Back

Garmin Body Battery 28-day chart showing a peak of 98.

The Great Recharge: How I Pushed My Garmin Body Battery Back to 98 By Richard Wharton Achieving a massive Garmin Body Battery recharge is the ultimate goal after the physical toll of outdoor labor drains you to zero. Following up on my last post, I wanted to share the physiological “bounce back” results that took […]

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 […]

The Happy Heart: Decoding My Garmin Sleep-Time Stress

A single night's Garmin Sleep-Time Stress chart showing the average stress score and HRV-based recovery bars.

Tracking my sleep isn’t just about how long I was “out”; it’s about what my Autonomic Nervous System (ANS) was doing while the lights were off. As a coach who preaches Physiology First, the Garmin Sleep-Time Stress metric is one of the most honest looks into my recovery. Let’s break down the data from my […]