Marcwills HRVA

MARCWILLS HRVA is a professional heart rate variability (HRV)
analyzer designed for sport science researchers, exercise
physiologists, and academic professionals.

Powered by the Polar H10 chest belt — the gold standard wearable
ECG sensor — MARCWILLS HRVA delivers research-grade physiological
monitoring in real time, directly on your Android device.

━━━━━━━━━━━━━━━━━━━━━━━
FEATURES
━━━━━━━━━━━━━━━━━━━━━━━

❤ REAL-TIME HEART RATE MONITORING
Track heart rate in beats per minute with Karvonen intensity
(%HRR) based on individual resting HR and age-predicted HRmax.

📈 HRV ANALYSIS
RMSSD, SDNN, pNN50, and Mean RR — calculated live from
beat-to-beat RR intervals streamed directly from the Polar H10.

⬡ POINCARÉ PLOT
Visualize autonomic nervous system dynamics with a live
Poincaré scatter plot, SD1/SD2 ellipse overlay, and built-in
interpretation guide for SD1 (parasympathetic), SD2 (overall
variability), and SD1/SD2 ratio (sympathovagal balance).

〰 ECG WAVEFORM — 130 Hz
Live ECG display at 130 Hz with automatic R-peak detection,
RR interval annotation, and QRS duration measurement.

📊 ACCELEROMETRY
3-axis motion monitoring (ACC X/Y/Z, magnitude) for
movement artifact detection during recording sessions.

👤 MULTI-SUBJECT REGISTRY
Register and manage multiple research subjects with individual
profiles: name/code, age, biological sex, and resting HR.

🗂 SESSION MANAGEMENT
Record, store, and manage unlimited sessions per subject.
Review session history with date, duration, and export options.

📤 DATA EXPORT
Export session data via Android Share Sheet:
- HR, RR intervals, and ACC data as CSV
- RR intervals as plain-text format (.txt) — compatible
with standard HRV analysis software

━━━━━━━━━━━━━━━━━━━━━━━━
REQUIREMENTS
━━━━━━━━━━━━━━━━━━━━━━━━

This app requires a Polar H10 chest belt sensor (sold separately).
The Polar H10 streams raw ECG at 130 Hz and beat-accurate
RR intervals via Bluetooth Low Energy (BLE).

━━━━━━━━━━━━━━━━━━━━━━━━
PRIVACY
━━━━━━━━━━━━━━━━━━━━━━━━

All data is stored locally on your device. No data is
transmitted to external servers or third parties.

━━━━━━━━━━━━━━━━━━━━━━━━
DISCLAIMER
━━━━━━━━━━━━━━━━━━━━━━━━

MARCWILLS HRVA is intended for research and educational
purposes only. It is not a medical device and should not
be used for clinical diagnosis or medical treatment.

━━━━━━━━━━━━━━━━━━━━━━━━
ABOUT
━━━━━━━━━━━━━━━━━━━━━━━━

MARCWILLS HRVA is the first app of the MARCWILLS
physiological monitoring platform, developed for sport
science research with future expansion into multi-sensor
monitoring environments.

Developer: Kukuh Pambuka Putra | MARCWILLS