Heart Rate Analysis
The Heart Rate Analysis tool provides a detailed breakdown of your heart rate data, including an HR curve showing your best average heart rate over various durations, and customizable best-effort intervals.
Overview
This analysis-only tool displays:
- HR Curve - Best average heart rate achievable for each duration (logarithmic chart)
- Best Efforts - Your highest average HR for specific time intervals
- Summary Statistics - Max recorded HR, average HR, and LTHR/Max HR percentages
Settings
LTHR (Lactate Threshold Heart Rate)
Enter your lactate threshold heart rate to see effort percentages relative to threshold. This value is saved in your browser for future use.
Max HR
Enter your maximum heart rate to enable the "% Max" display mode. When set, you can toggle between viewing heart rate in BPM or as a percentage of your maximum.
HR Curve
The HR curve chart shows your best average heart rate for durations ranging from 1 second to the full ride length. The X-axis uses a logarithmic scale for better visibility across short and long durations.
| Duration Range | Detail Level |
|---|---|
| 1-10 seconds | Every second |
| 10-60 seconds | Key intervals (12s, 15s, 20s, 30s, 45s, 60s) |
| 1-10 minutes | Every 30 seconds |
| 10-60 minutes | Every minute |
| 1-4 hours | Every 5 minutes |
LTHR Reference Line
When LTHR is set, a dashed orange line appears on the chart showing your threshold heart rate for easy reference.
Best Efforts
The best efforts section shows your highest average heart rate for user-selected durations.
Default Durations
- 5 seconds
- 1 minute
- 5 minutes
- 20 minutes
Custom Durations
Click "Edit Durations" to customize the intervals. Enter comma-separated values using formats like:
5s- 5 seconds30s- 30 seconds1m- 1 minute5m- 5 minutes20m- 20 minutes1h- 1 hour1h30m- 1 hour 30 minutes
Custom durations are saved in your browser for future use.
Display Modes
Toggle between two display modes using the BPM / % Max buttons:
- BPM - Absolute heart rate values
- % Max - Percentage of maximum heart rate (requires Max HR to be set)
Summary Statistics
| Metric | Description |
|---|---|
| Max Recorded | Highest heart rate recorded during the activity |
| Avg HR | Average heart rate across the entire activity |
| Avg % LTHR | Average heart rate as percentage of LTHR (when set) |
Data Requirements
| Feature | Requires |
|---|---|
| HR curve | Heart rate monitor data |
| Best efforts | Heart rate + timestamp data |
| % Max display | Max HR setting |
| % LTHR display | LTHR setting |
Tips
- The 20-minute best effort is commonly used as a proxy for LTHR
- Compare your HR curve across rides to track fitness changes
- A flatter HR curve suggests good aerobic conditioning
- Sharp drop-offs in the curve indicate duration limits for high-intensity effort