Something, but someone keeps changing the marks on the ruler. It is like trying to use a ruler to measure If you are a bit dehydrated, it will run high. If you didn't get enough sleep last night, your heart rate That HR is dependant upon lots of things that have nothing to do with how fast It's like this: HR is not the best marker of exercise intensity. Unfortunately, it isn't quite that simple. lactate concentration in the blood, because lactate curves upwards quicklyĪs you run faster, indicating more metabolic stress on the body. Banister developed this weighting factor by making a graph of heart rate It curves upwards as you go faster, and the curve gets steeperĭr. In other words, exercise difficulty risesĮxponentially. The 100M dash in 20 seconds is fine, but running it in 10 seconds is not just Thing: Exercise difficulty does not increase linearly. This weighting factor, which you might initially be puzzled by. (minutes trained), we have intensity (how high the HR is), and we also have If you think about it, this formula makes good sense. TRIMPS = Exercise duration (minutes) Average HR (BPM)Ī HR-dependant, intensity-based weighting factor It worksīy using heart rate, and follows the formula: The first metric was something called the Training Impulse Score Score a workout, which takes into account both the duration and intensity of A training metric is something that we can use to So really, how is it possible to take all of these variables into account? What These details make importantĭifferences not only in communication, but also in your development as anĪthlete and your body's response to the training you do. Probably had a track workout as well, or one of your runs was faster because Moreover, you really didn't just train at 8 minutes per mile, did you? You Is 8 minutes per mileįast for you? What percentage of your race pace does that translate into? Yet, even this statement does not tell the whole story. Ok, so you might say, 'I put in about 20 miles at about 8 minutes per mile.' 20 miles at 5 minutes per mile is a lot harder than 20 miles at a You ran 20 miles, but you didn't say how fast For instance, if you respondedīy saying, 'Oh, I put in about 20 miles a week,' you really didn't answerĪppropriately. More difficult question than it might appear. If someone asked you how much running you do, how would you respond? It is a

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