TSS post

_posts/2022-07-05-TSS.md

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+---
+layout: post
+title: Estimating NP®, IF®, TSS®, 
+author: Stuart Lynne
+---
+## Overview
+
+FTP, NP®, IF®, TSS®, were introduced by *Hunter Allen* and Andrew Coggan, PhD in their book 
+*Training and Racing With a Power Meter*
+
+## FTP
+FTP or Functional Threshold Power is the power that can be maintained for roughly one hour.
+
+## NP®
+NP® or Normalized Power ® adjusts the power data of a workout to account for the increased stress
+of the intensity. From the book:
+
+> 1. Starting at the beginning of the data and calculating a 30-second rolling average for power,
+>
+> 2. Raising the values obtained in step 1 to the fourth power;
+>
+> 3. Taking the average of all the values obtained in step 2; and
+>
+> 4. Taking the fourth Root of the number obtained in step 3.
+
+##  IF®
+IF® or Intensity® of a workout is defined as:
+
+```
+    intensity = np / ftp
+```
+
+## TSS® 
+TSS® or Training Stress Score ® was developed by Dr. Andy Coggan to represent
+the physiological impact of a workout that takes into account the intensity of the workout.
+
+TSS is defined as:
+```
+    tss = (duration of workout * NP * IF) / (FTP * 3600) * 100
+```
+
+## Differences between implementations
+
+The implementations of *Normalized Power* vary because the it is based on the data collected from
+power meters which is then transmitted via either Ant+ or BLE to the collector of the data. This process
+is *not lossless*. Data can be lost. 
+
+How the missing data is corrected or interpolated is not specified.
+
+From a (SlowTwitch forum post)
+(https://forum.slowtwitch.com/forum/Slowtwitch_Forums_C1/Triathlon_Forum_F1/Can_you_trademark_a_metric_TSS,_IF,_NP,_etc.__P3910865)
+, May 7, 2012:
+```
+gear_fisher
+May 7, 12 10:27
+Post #23 of 30 (6722 views)
+...
+We are happy to discuss the use of the terms with anyone, we claim no royalty, simply attribution. 
+...
+The formula for TSS based on power is public knowledge, but it is held as trade secret 
+on how we handle data-gaps and other specific circumstances when applying the formula. 
+...
+-Gear
+CEO, Peaksware
+http://www.TrainingPeaks.com
+```
+
+## See also
+
+[Analyzing your Cycling Data Johannes Jacob](http://johannesjacob.com/analyze-your-cycling-data-python/)
+[Build Your Own Performance Chart Johannes Jacob](http://johannesjacob.com/2019/03/20/build-your-own-performance-management-chart-python/)
+
+[Training Stress Score for Cycling: What TSS is, how to use it, and what it doesn’t tell you]
+(https://trainright.com/training-stress-score-what-is-tss-for-cycling/)
+
+[Estimating Training Stress Score (TSS®) JOE FRIEL](https://www.trainingpeaks.com/learn/articles/estimating-training-stress-score-tss/)
+
+
+## Trademarks
+
+The names of some TSS® statistics are registered trademarks of TrainingPeaks.
+
+See: [TrainingPeaks About Us] (https://www.trainingpeaks.com/about-us/)
+
+> Our Trademarks
+> 
+> By introducing scientific tools and methods that have become the industry standard, 
+> TrainingPeaks has revolutionized the way that coaches and athletes track, analyze 
+> and plan endurance training. Our registered trademarks include 
+> TrainingPeaks®, TSS®, Training Stress Score®, IF®, Intensity Factor®, NP®, Normalized Power® and VirtualCoach®.
+