Advanced Heart Rate Performance Report: Comparisons with Garmin, Apple Watch, and Polar H10

Introduction

This report evaluates the heart rate (HR) tracking performance of Luna Ring compared to Garmin, Apple Watch, and Polar H10. The analysis focuses on accuracy, response time, and reliability during different activity levels, using Polar H10 as the reference gold-standard device.

Following being the Data Sources:

1. Luna vs Garmin vs Polar H10
2. Luna vs Apple Watch vs Polar H10
3. Active HR performance analysis using Goodix GH3220 Green Channel
4. HR accuracy testing (MAE, RMSE) during different activities

Key Findings: Overall Accuracy Comparison

Heart Rate Accuracy Across Activities
Resting Conditions:

• Luna Ring: Minimal variation, closely follows Polar H10.
• Apple Watch: Slightly higher deviation (~2.2 BPM) but still reliable.
• Garmin: Occasional HR drops/spikes causing inconsistency.

Moderate-Intensity Activities (Walking, Cycling 50-90 RPM):

• Luna Ring: Maintains ±3 BPM accuracy.
• Apple Watch: Good response, with slight drift over time.
• Garmin: Lags in transitions, causing slight accuracy loss.

High-Intensity Activities (Running, Step Test):

• Luna Ring: Shows ±5 BPM deviation with rapid HR changes.
• Apple Watch: Performs well, but slow to adapt to sudden HR spikes.
• Garmin: Struggles with rapid HR increases, showing up to 10 BPM error.

Performance During Sudden HR Transitions

• Luna Ring tracks HR more accurately during rapid HR transitions (±1.5s delay).
• Apple Watch performs well but exhibits a slight lag in extreme HR fluctuations.
• Garmin exhibits larger variability (~8-10 BPM deviation).

Statistical Analysis

Root Mean Square Error (RMSE):

• Luna Ring: Low RMSE (High Precision)
• Apple Watch: Moderate RMSE (Good Consistency)
• Garmin: High RMSE (Higher Variability)

Bland-Altman Analysis:

• Luna shows a narrow Limits of Agreement (LoA) with Polar H10.
• Apple Watch has wider deviations, particularly in high BPM ranges.
• Garmin exhibits the most inconsistencies, especially in higher intensity activities.

Conclusion & Recommendations

1. Luna Ring outperforms Garmin in accuracy, consistency, and real-time HR tracking.
2. Apple Watch is a strong performer but shows minor delays in extreme HR transitions.
3. Garmin has higher variability, making it less suitable for HRV and precise fitness tracking.
4. Luna Ring is recommended for users seeking high-accuracy HR monitoring, especially for heart rate variability (HRV) and fitness tracking applications.