Power Stability

Helps riders using a power meter improve time trial performance by showing real-time power variability. The key idea is smaller power and energy fluctuations result in faster times and lower fatigue. The Power Stability Field supports "steady-state" effort by providing visual feedback on how smooth and consistent your power and kinetic energy are in real-time. Here is how a cyclist experiences the data field during a ride: 1. The Core Metric: 3-Second Power At the center of the display, you see your standard 3-second average power. This provides the immediate feedback on current effort. 2. The Dynamic Background: Effort Trending The background color acts as a "trend indicator." 10-second power Coefficient of Variation the field changes color to tell you if your effort is currently surging or fading. Blue indicates the lowest values (e.g., below 10%), red exceeds max value, (e.g., 20%), green in-between. Under a lower power limit, 100 Watts, the display is plain. Limits are configurable. 3. Stability Gauges: The "Purple Bars" Visualize Stability % (Coefficient of Variation), purple bars grow or shrink based on two metrics: • Left: Kinetic Energy (KE) stability: This is useful for time trialists or solo riders; it measure how KE is changing, (delta Velocity Squared). Rate of KE change is a component of power consumption, or addition, i.e., adds power. • Right: Power Stability (Pwr): Shows how power consistency. A smaller bar indicates a steady output style, while a larger bar suggests an erratic effort with frequent micro-surges. 4. Post-Ride Analysis The data field records both the Power Stability (CV_Pwr) and KE Stability (CV_KE) directly into your activity's FIT file. Summary for the Athlete Instead of just asking "How hard am I pushing?", these fields indicate "How steady is my effort?". It’s a tool designed to improve their efficiency and maintain a smooth flow.

Both power and kinetic energy use Coefficient of Variation, CV, rather than power using 3S/10S ratio.