📅 Last updated: June 2025 · Source: USPTO Trademark Filing
Ever pushed through a workout feeling fine on paper — heart rate steady, pace solid — only to have your legs just stop working? That disconnect between what your watch says and what your muscles feel is exactly the gap Garmin is now preparing to close. Official regulatory filings have confirmed the trademarking of a brand new system called Muscle Battery, explicitly designed to measure localized muscular fatigue rather than broad full-body cardiovascular exertion.
The Tech ConceptWhat is the Garmin Muscle Battery metric?
Unlike standard Body Battery algorithms that rely on Heart Rate Variability (HRV) and sleep staging, Muscle Battery utilizes advanced software tracking built to capture real-time muscle oxygen saturation (SmO2). Using specialized algorithms, it tracks how fast a targeted muscle group consumes oxygen during a high-intensity interval block, mapping out localized depletion and cellular tissue recovery metrics.
| Metric | Body Battery | Muscle Battery |
|---|---|---|
| What it measures | Whole-body energy reserve via HRV, sleep & stress | Localized muscle oxygen depletion per muscle group |
| Sensor type | Optical heart rate (wrist-based) | Near-Infrared Spectroscopy pod (strapped to muscle) |
| Hardware needed | Any compatible Garmin watch | Dedicated SmO2 sensor pod (new ecosystem) |
| Best for | General daily readiness & recovery | Targeted interval training, HYROX, strength blocks |
| Current status | Shipping on most Garmin devices | Trademarked — hardware unconfirmed |
| Best for… | Casual training & daily readiness monitoring | HYROX athletes & serious hybrid training |
Will Garmin release a muscle oxygen sensor?
While compatible Garmin wearables have read third-party SmO2 hardware profiles like Moxy Monitor or Train.Red via standard ANT+ configurations for years, this direct trademark filing strongly implies own-branded consumer hardware is in active development. Wrist-based optical configurations cannot achieve this, meaning Garmin is likely preparing dedicated ecosystem pods.
Whoop built its brand on recovery — knowing when your body is ready. Garmin is betting athletes want something more precise: knowing which muscle is failing, not just that you’re fatigued. That’s a fundamentally different product philosophy, and it could split the market in two.
Who needs muscle oxygen tracking?
You’re a runner who also lifts — or a HYROX competitor who wants to know exactly when your legs are running on empty vs. when your engine can push harder.
- Incorporate serious hybrid strength blocks or focus on HYROX race events
- Want to identify exact physiological lactate thresholds without lab blood draws
- Need clear guidance on precise pacing adjustments during brutal hill intervals
You lace up three times a week for easy, enjoyable runs and have zero interest in strapping additional sensors to your body.
- Focus entirely on relaxed casual zone 2 base building runs
- Dislike wearing auxiliary external sensor pods across your legs or arms
- Prefer simple clean training summaries without massive data streams
By securing the Muscle Battery framework, Garmin is building an architectural moat that competitors will struggle to match. Transitioning niche near-infrared laboratory metrics into an easy-to-digest metric layer could fundamentally change how long-distance runners structure hard power training blocks moving forward.
Anurag Rana
Founder & Editor · FatMarathoner.com
Delhi-based long-distance runner with over 10 years of racing and training across India’s roads, hills, and high-altitude terrain. Ladakh Marathon finisher. I’ve trained through Delhi winters in Lodhi Garden, raced in 40-degree heat, and logged enough kilometres on India’s marathon circuit to know what actually matters on race day — and what doesn’t. FatMarathoner is built on that experience: honest, first-person race guides, gear reviews, and training advice written for Indian runners by someone who runs every course I write about.