Then, go to the Connect IQ store on Garmin Connect Mobile, or directly at this page: and get the stuff. Compatible devices with powermeters and Connect IQ are, at the time of writing are: Where can I get this app ?įirst, you will need to ensure your Garmin device is compatible with Connect IQ apps, and has an updated firmware. Science has not yet validated one against the other. The only advice I can give you is: try both formulas and choose the one you prefer. Values here are for a mixed field test (5min VO2Max, 10 min recovery, 20 min FTP test). The blue line is the differential formula (the one used by default in GoldenCheetah). What is the difference between the two formulas? This one: It’s known as “ differential” and available starting from version 1.2 on my data field, but you have to configure “compute method” parameter to “differential” instead of “integral”. It’s now the default method on GoldenCheetah. The second method, by Froncioni / Clarke only use current power to compute recovery, so with this formula, W’ Bal will usually regenerate faster, and decrease faster as well. This value is known as TAU, and it’s based on the activity history. On my data field, it’s called “ integral” and it’s the default method, just because I prefer it… This formula uses another parameter to define the speed at which W’ is regenerating when the power is below CP. It was the one implemented in GoldenCheetah at the beginning. Initially, the only known formula to get W’ Bal was the one from Dr Skiba. Compute methods (the real maths behind the data) Of course, if you already know your FTP value, you can use it as CP. Based on that, it will give you an estimation of W’ and CP. Here you can enter you maximum amount of watts for a short effort (3-5min) and a long one (15-60 minutes). To estimate your CP and W’ values (if you don’t already know them), GoldenCheetah provides a tool in the “ Tools -> Estimate CP and W’” menu. To be able to compute W’ Bal, we need two values: You can note on this chart the peaks above CP (the line is going down, as the amount of remaining W’ decrease), and the periods where power is below CP (the line is going up, as the amount of remaining W’ increase). Skiba theory, and this value was then implemented on the GoldenCheetah software, on the “Charge” chart of a ride: So if you ride long enough below CP, W’ will be at 100% again.Īll these variation in W’ are expressed as “W’ Bal” in the Dr. As soon as your watts get lower than CP, W’ will “regenerate”, and the value will increase again. So if you push on the pedals harder than CP, W’ will decrease. At my level, I use to consider my CP and FTP as the same value. The limit at which you will start lowering the W’ is known as CP (Critical Power). But if you push harder, you will start using this energy. While you’re riding at low intensity, W’ remains at it full level, and you can theoretically continue riding at this intensity for a while. This value, known as W’ (or W prime) is measured in joules. To make it simple, assume that a cyclist have a given amount of energy at the beginning of a ride. Let’s dig a bit into this interesting value… This app is designed to display the remaining value of W’ during a ride on the cyclist’s device. A few weeks ago, I released the first version of my W’ Bal datafield on Garmin Connect IQ.
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