Power Analysis
The Power Analysis tool provides a detailed breakdown of your power meter data, including a power curve showing your best average power over various durations, customizable best-effort intervals, and optional W/kg display.
Overview
This analysis-only tool displays:
- Power Curve - Best average power achievable for each duration (logarithmic chart)
- Best Efforts - Your highest average power for specific time intervals
- Summary Statistics - Max power, average power, and FTP percentages
Settings
FTP (Functional Threshold Power)
Enter your FTP to see effort percentages relative to threshold. This value is saved in your browser for future use. FTP is typically your best average power for a 1-hour effort (or 95% of your 20-minute best).
Weight
Enter your body weight in kilograms to enable the "W/kg" display mode. When set, you can toggle between viewing power in watts or watts per kilogram.
Power Curve
The power curve chart shows your best average power 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 |
FTP Reference Line
When FTP is set, a dashed orange line appears on the chart showing your threshold power for easy reference.
Best Efforts
The best efforts section shows your highest average power 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,30s,1m,5m,20m,1h,1h30m
Custom durations are saved in your browser for future use.
Display Modes
Toggle between two display modes:
- Watts - Absolute power values
- W/kg - Watts per kilogram (requires weight to be set)
Summary Statistics
| Metric | Description |
|---|---|
| Max Power | Highest power recorded during the activity |
| Avg Power | Average power across the entire activity |
| Avg % FTP | Average power as percentage of FTP (when set) |
Color Coding
Best effort bars are color-coded by intensity relative to FTP or estimated max:
| Color | Intensity |
|---|---|
| Red | > 95% of max (sprint/VO2max) |
| Orange | 85-95% (threshold) |
| Yellow | 75-85% (tempo) |
| Green | < 75% (endurance) |
Data Requirements
| Feature | Requires |
|---|---|
| Power curve | Power meter data |
| Best efforts | Power + timestamp data |
| W/kg display | Weight setting |
| % FTP display | FTP setting |
Tips
- The 20-minute best effort multiplied by 0.95 is a common FTP estimate
- Compare power curves across rides to track fitness gains
- 5-second power indicates neuromuscular capacity
- 1-minute power reflects anaerobic capacity
- 5-minute power approximates VO2max power
- 20-minute power approximates FTP