What is PMC? How to Balance Your Fitness, Fatigue, and Form?

What is PMC? How to Balance Your Fitness, Fatigue, and Form?

The Performance Management Chart (PMC) is a powerful tool that helps you plan and track your training at the Training Peaks platform. It allows you to balance your fitness, fatigue, and form to achieve your best performance.

PMC calculates your Training Stress Score (TSS) based on the duration and intensity of each workout and uses this data to determine fatigue (ATL - 7-day average), fitness (CTL - 42-day average), and form (TSB - fitness minus fatigue). This visualization helps you understand when to push harder and when to rest to be in peak condition for race day.

Let's take a closer look at how to use these metrics effectively.

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What is Training Stress Score (TSS)?

Everything starts with a Training Stress Score (TSS). Each workout receives a stress score based on its duration and intensity. For example, a short but intense session will have a different TSS than a long but moderate one.

TSS is calculated using the following formula:

TSS = (duration x NP x IF) / (FTP x 3600) x 100

Where:

• Duration (in seconds)
• NP (Normalized Power)
• IF (Intensity Factor - percentage of your FTP, indicating effort level)
• FTP (Functional Threshold Power - maximum power sustainable for one hour)
• 3600 (number of seconds in an hour)

No need to worry about these calculations—most training software and devices handle them automatically.

You can estimate your TSS by considering workout duration and intensity if you don't have a power meter. For example:

• 30 minutes at moderate intensity (~RPE 6) → TSS: 35
• 90 minutes at low-moderate intensity → TSS: 90
• Intense interval session (total 60 min, 15 min warm-up, 30 min high intensity, 15 min cooldown) → TSS: 65

Remember, achieving 100 TSS in one hour means working at your FTP level. Anything above that for more than an hour is generally unrealistic.

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Fatigue (Acute Training Load - ATL)

This is the exponentially weighted average of your training stress over the last 7 days. Recent workouts significantly impact your fatigue level more than older ones.

After a challenging workout, your ATL will spike, indicating that your body needs time to recover. Persistently high ATL values may lead to overtraining and decreased performance.

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Fitness (Chronic Training Load - CTL)

CTL represents the exponentially weighted average of your TSS over the last 42 days. It reflects how your training has influenced your overall fitness in the long run.

Increasing training volume will raise CTL, but as CTL increases, ATL also rises. Too much training without recovery can lead to excessive fatigue.

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Form (Training Stress Balance - TSB)

Form is calculated by subtracting yesterday’s fatigue (ATL) from yesterday’s fitness (CTL):

TSB = CTL - ATL

• A negative TSB means you are carrying too much fatigue and may not be race-ready.
• A positive TSB means you are well-rested and more likely to perform at your best.

However, a very high TSB is not ideal, as it suggests that your training intensity has been too low, potentially leading to a loss of fitness. Generally, a slightly negative or positive TSB (around +25 or lower) is optimal for race day.

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How to Use PMC Effectively

PMC helps you train smarter. Here are a few ways to use it:

1. Race Preparation: Reduce ATL to bring TSB into positive territory, ensuring peak performance on race day.
2. Avoiding Overtraining: You may need more recovery if ATL is too high and TSB is too low.
3. Tracking Fitness Progress: Monitor CTL trends to ensure long-term improvements.

Ultimately, PMC is not just about analyzing your training data—it’s about understanding your body and optimizing your performance. By leveraging this system, you can arrive at race day in peak condition!