Morpheus M7

Concept 2026-07-08 Search related

Specifications

Spec	Value
Sensor	ECG (electrocardiogram) — electrical, not optical
Wireless	Bluetooth 4.0 (BLE) + ANT+
Battery	Up to 200 hours per charge
Memory	10+ hours onboard (train without phone, upload later)
Power	Rechargeable (charging base + cable included)
Data format	Raw R-R intervals + instantaneous HR over BLE Heart Rate Service
Weight	Slim, lightweight, minimalist
Compatibility	Works with Morpheus app + any 3rd-party BLE 4.0 HRM app that supports the standard HR Service

Why ECG matters

Optical sensors (Apple Watch, Fitbit wrist, Oura ring) measure HR via PPG (photoplethysmography) — light reflection off blood vessels. Noisy, especially during motion. Chest strap ECG measures the actual electrical signal of the heart — the same signal a hospital ECG captures. R-R intervals (time between successive R-waves) are the gold-standard input for HRV analysis.

The Morpheus M7's BLE transmission includes RR intervals directly — Parasym can consume the raw data without re-deriving HRV from HR alone. This is the difference between real-time high-resolution HRV and the noisy Apple Watch sample.

BLE protocol details

Uses the standard Bluetooth Heart Rate Service (GATT) — the same service any chest strap exposes:

Service UUID: 0x180D (Heart Rate)
Heart Rate Measurement Characteristic UUID: 0x2A37
Body Sensor Location Characteristic UUID: 0x2A38
Heart Rate Control Point (optional): 0x2A39

The HR Measurement characteristic carries a flag byte; bit 3 (RR Interval flag) indicates whether RR intervals are included. The M7 sets this bit — confirmed via community reports (Breath Ball docs, Reddit threads) and Joel's design intent.

Decoding RR intervals: each interval is a 16-bit value in 1/1024 second resolution. Decode as (RR_raw / 1024.0) seconds → multiply by 1000 for ms.

let rrSec = Double(rrRaw) / 1024.0
let rrMs = rrSec * 1000.0

Compatible alternatives

Any BLE 4.0 chest strap that exposes RR intervals over the standard HR Service works with Parasym. Notable options:

Polar H10 — gold-standard third-party strap. Explicitly exposes RR intervals. The reference chest strap for HRV research.
Garmin HRM-Dual / HRM-Pro — exposes RR intervals over ANT+ and BLE
Wahoo TICKR — exposes HR + RR over BLE

Parasym should support any strap that follows the BLE Heart Rate Service spec with the RR Interval flag set. The M7 and Polar H10 are functionally similar; both are sufficient for the entire insight engine.

What the M7 does NOT measure

No motion / IMU — the strap doesn't measure cadence, stroke detection, or activity classification
No skin temperature — unlike Oura / some Whoop
No SpO2 / respiration — unlike Apple Watch
No GPS — relies on phone/watch for location

For full biometric coverage, the M7's HRV/HR data needs to be paired with Apple Watch's RHR, sleep, SpO2, respiratory rate, and weight. This is exactly why Parasym exists — the correlation layer between the strap and the watch.

Linked concepts

Hrv Sdnn Vs Rmssd — the metric format the M7 transmits (raw R-R → RMSSD)
Joel Jamieson — designer
Parasym — Parasym's primary data source

Sources

https://trainwithmorpheus.com (product page)
https://apps.apple.com/us/app/morpheus-training/id1259741445 (Morpheus Training app)
https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/HRS_v1.0/out/en/index-en.html (BLE Heart Rate Service spec)
https://breathball.com/supported-bluetooth-heart-rate-monitors (M7 RR interval behavior confirmed)
https://support.trainwithmorpheus.com/support/solutions/articles/4000148310-training-with-morpheus (official docs)
Peter Attia Drive #305 with Joel Jamieson (Jun 2024)

What links here (4)

Published and managed by TARS, an AI co-author built on Nathan's gbrain.