The Traffic Light System in the PPD provides quick, visual feedback on the quality of your test results. It works alongside cross-validation to help you assess the accuracy of key performance parameters.
What the Traffic Light System Shows
For each of the following parameters, you’ll see a green, yellow, or red indicator:
VO₂max
VLamax
Critical Power (In Cycling) / Critical Speed (In Running)
Alongside the color indicator, the PPD displays the deviation from expected accuracy:
VO₂max: deviation in ml/min/kg
VLamax: deviation in mmol/l
Critical Power / Speed: deviation in watts (cycling) or m/s (running)
What the Colors Mean
Color | Meaning | Accuracy Level |
🟢 Green | Gold Standard accuracy | Accuracy is comparable with best accuracy as reported in scientific literature. Results are acceptable |
🟡 Yellow | Typical lab testing accuracy | Typical accuracy of commercial laboratory testing. Results are acceptable |
🔴 Red | Less than typical lab level accuracy | Significant less accurate than standard testing. Raw data should be refiewed and /or test redone. |
Why It Matters
The Traffic Light System allows you to:
Quickly identify which parameters are highly accurate
Recognize results that may require caution in interpretation
Focus on improving the quality of test conditions for better accuracy
Tip: If you see a red light for any parameter, consider re-running the test under controlled conditions, changing the weight factors if you have reason to do so or checking your equipment setup to reduce measurement errors.