![]() It measures the true physiological demands of a training session. Normalized Power is calculated using an algorithm that is a little complex, but in a nutshell takes into account the variance between a steady workout and a fluctuating workout. The components that comprise TSS are what make it so useful to athletes. It’s worth defining and understanding this equation so you have an idea of why TSS is so accurate, and how the final score is derived. Where “sec” is the duration of the workout in seconds, “NP” is Normalized Power, “IF” is Intensity Factor, “FTP” is Functional Threshold Power, and “3,600” is the number of seconds in an hour. TSS = (sec x NP x IF) / (FTP x 3600) x 100 TSS is calculated using the following formula: It’s a composite number that takes into account the duration and intensity of a workout to score the overall training load and physiological stress created by a training session.īy taking both intensity and duration into account, TSS allows for a better understanding of the “cost” of every individual effort and workout. Specially designed for cycling, the Training Stress Score metric tells you how much stress your body underwent on a ride. What is TSS?įirst things first, you need to understand TSS. Understanding what both TSS and hrTSS are allows for a deeper discussion of the two and their merits. Understanding the stress that training puts on the body’s systems, and whether or not the desired response is being produced is integral to the modern training process. The primary goal of a metrics-based approach to training is to understand what the body is undergoing from a physiological perspective, and how that ultimately influences training decisions. So get yourself a coffee, sit back and read on. You can have all the technology in the world, but to get the most of your training, your Suunto watch and TrainingPeaks, it’s worth the time getting a clear understanding of these two training metrics: TSS and hrTSS. ![]() TSS, hrTSS and other TrainingPeaks features can be accessed in the SuuntoPlus section of Suunto 9 and Suunto 5 watches. ![]() This lets you adjust the effort and duration of the exercise on the go, helping you reach your goal. On Suunto 9 and Suunto 5 watches you are able to follow TSS and hrTSS in real-time. ![]() ( Read more about benefits you get with Suunto & TrainingPeaks.) After each activity, you can analyze your heart rate, power, pace and other data to determine where you are at. You track your workouts with your Suunto watch and TrainingPeaks gives you in-depth analysis and planning tools to achieve your full potential. The partnership between Suunto and TrainingPeaks was formed to give you full command of your training data. TSS is dependent on training with power, and ideal for cyclists, while hrTSS is an alternative for those training without power, and can be helpful for runners and other endurance athletes, such as cross-country skiers. It tells you how hard your training session was and the physical stress of your training over time. TSS is probably the most used training load algorithm amongst endurance athletes. Whether you are a triathlete, cyclist or a marathoner, TSS and hrTSS are two training languages well worth getting your head around. It’s trying to tell you something, but you can only understand if you speak its language. One of the best ways runners and cyclists can constantly improve is by having a solid understanding of their training data. What are TSS and hrTSS and how can these training metrics help?
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