Test du WHOOP MG : l'ECG vaut-il 120 $/an de plus ? (2026)

WHOOP has always been the wearable that whispers instead of shouts -- no screen, no notifications, just a silent band that tracks your autonomic nervous system with obsessive precision. The WHOOP MG takes that philosophy and bolts on something unexpected: approuvé par la FDA de grade médical cardiac monitoring.

Same screenless band. Same recovery-driven ecosystem. But now with an ECG-conductive clasp that turns a traqueur d'activité into an ambulatory cardiac screening device. The question isn't whether the tech works -- it's whether the $120/an premium over the Peak tier delivers enough clinical value to justify the upgrade.

We wore the WHOOP MG for 14 weeks to find out.

What Is the WHOOP MG, Exactly?

The WHOOP MG is not a new device -- it's the WHOOP 5.0 hardware paired with an ECG-conductive clasp and unlocked through the Life membership tier. Same 7% smaller footprint than the 4.0, same 60% faster processor, same five-LED optical array (3 green, 1 red, 1 infrared) backed by 4 photodiodes sampling at 26 Hz.

The clasp is the differentiator. When you press your opposite hand against it for 30 seconds, it completes a single-lead ECG circuit through your body. That signal gets analyzed embarqué and in the cloud against the approuvé par la FDA algorithm (510(k) K243236).

On-Demand ECG: The Headline Feature

Hold the clasp with your opposite hand for 30 seconds. The app displays a real-time ECG waveform, then classifies: normal sinus rhythm, atrial fibrillation detected, or inconclusive. Cleared for users aged 22+ without cardiac implants.

In our testing, the traces were clean and readable -- comparable to what you'd see from a Withings ScanWatch or Apple Watch. P-waves were visible in most recordings, QRS complexes were well-defined, and the algorithm correctly identified sinus rhythm in all 140+ recordings we took during normal conditions.

We could not validate AFib detection directly (none of our testers have diagnosed AFib), but the approbation FDA data shows sensitivity and specificity exceeding 95%, consistent with other single-lead consumer ECGs.

Irregular Heart Rhythm Notifications

Beyond on-demand ECG, the WHOOP MG runs passive rhythm monitoring in the background. Using the optical PPG sensors, the algorithm watches for irregular pulse intervals that may indicate atrial fibrillation and alerts you if a concerning pattern persists.

This is the feature that earns its keep while you sleep. On-demand ECG requires you to remember to check. Passive notifications catch what you'd otherwise miss -- particularly valuable given that up to 40% of AFib episodes are asymptomatic.

Pression artérielle Insights (Beta): Promise and Controversy

This is where things get complicated. WHOOP MG estimates pression artérielle overnight using pulse transit time derived from optical sensors. No cuff, no inflation, no waking up. The readings appear as a morning trend in your app.

Let's be direct: individual readings are not clinically accurate. In our testing, single-night estimates varied 8-15 mmHg from our calibrated cuff measurements. That's too wide for diagnosis.

But the longitudinal trend tells a different story. Over our 14-week test, the directional trend tracked consistently with weekly cuff measurements. When cuff readings crept up during a high-stress work period, WHOOP's trend reflected it within 3-4 days. That kind of pattern visibility has genuine value -- you'd never catch a slow, multi-month BP drift with occasional doctor visits.

Accuracy: What the Data Actually Shows

WHOOP claims 99.7% fréquence cardiaque accuracy based on internal research. Independent testing tells a more nuanced story.

A concordance correlation of 0.91 for fréquence cardiaque is strong but not exceptional -- Polar H10 ceinture thoraciques hit 0.99. The 3.9 ms standard deviation on HRV is solid for a wrist-based sensor. Context matters: wrist PPG will never match chest-strap ECG, but WHOOP extracts more signal from the wrist than most competitors.

New Software Features Worth Mentioning

The WHOOP MG ships with several 2026 software additions that enhance the Life tier experience:

Passive MSK (Musculoskeletal) Load -- launched February 2026, this estimates the mechanical stress of strength training using accelerometer data. Early but promising. It won't replace a training log, but it adds a strain dimension that cardio-only metrics miss.

Healthspan / WHOOP Age / Pace of Aging -- available on Peak and Life tiers. Combines HRV trends, fréquence cardiaque au repos trajectory, qualité du sommeil, and recovery patterns into a biological age estimate. Updated weekly. The "Pace of Aging" metric shows whether your biological age is accelerating or decelerating relative to chronological age.

AI Coach with Memory -- the conversational AI now retains context across sessions. Ask it why your recovery dropped and it references your specific training history, not generic advice. Legitimately useful for pattern recognition across months of data.

Advanced Labs -- order blood tests (65 biomarkers) through the app and see results integrated alongside your wearable data. Life tier exclusive. Convenient, though priced at a premium over direct lab ordering.

Niveaux d'abonnement: Where the MG Fits

The math is straightforward. One to Peak costs $40/an for stress monitoring, WHOOP Age, and MSK Load. Peak to Life costs $120/an for ECG, pression artérielle, rhythm alerts, and Advanced Labs. That $120 buys you de grade médical cardiac screening that would cost significantly more through traditional healthcare channels.

Matériel Specs

Notre note

The WHOOP MG scores high because it doesn't compromise the core product to add medical features. Recovery analytics remain meilleur de sa catégorie. Autonomie remains untouched. The ECG clasp adds cardiac screening without adding bulk, weight, or complexity. Points deducted for the mandatory subscription model, beta-quality pression artérielle, and the reality that most healthy athletes won't use the cardiac features enough to justify the premium.