Power model and other new things

20 January, 2020 by David Johnstone

Cycling Analytics just received a major update.

The biggest new feature is the power model analysis tool. This looks at your power data and estimates how strong you are using the critical power model. This includes an FTP estimate.

Precisely what this shows is a bit complicated. The most important part is the numbers shown underneath. If you’re not interested in any theory, then note that this estimates your FTP, and there’s something underneath that predicts what power you should be able to sustain for any duration longer than a minute or two.

If you are interested in some theory, then according to the critical power model, you can sustain a certain power output indefinitely (critical power, CP) and you also have a certain amount of additional energy that can be used above the critical power (W’). As an equation, the maximum power that can be sustained for a duration is CP + W’ / time. For example, using the numbers in the screenshot, the maximum power that could be sustained for ten minutes is 280 + 17111 / 600 = 309W. There’s something underneath this chart on the power model page so you don’t need to do any maths yourself.

The orange line is the maximum power curve for the selected period, but shown as energy (joules) rather than average… continue reading

Recent updates

29 October, 2018 by David Johnstone

There have been a few noteworthy updates to this site recently.

The histograms chart has been rewritten to be better and more flexible. Most notably, the bucket width can now be modified.

A number of changes have been made to training plans. Intensity, distance and climbing can now be specified for workouts, and when any two of duration, training load and intensity are specified, the other is calculated automatically. If all three are entered, the one entered least recently is changed.

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Upload rides from Zwift

16 October, 2018 by David Johnstone

Here’s a bookmarklet that makes it possible to upload rides directly from Zwift to Cycling Analytics. When run, a button is added to the Zwift interface to upload rides.

The first step is to create an authentication token so that the bookmarklet will have permission to upload rides. Go to the API console and enter the following and hit “enter”:

POST /tokens {permissions: 'create_rides'}

(This token will then be displayed on the apps page and can be deleted there.)

Copy and paste the token here (just the part that looks something like EFS4Ef5wfDC8pmYbmpM3vITbjZY8wDWD) and click “create”:

Zwift to CA

How does your cycling power output compare?

7 June, 2018 by David Johnstone

It’s common to be curious about how your power output or FTP compares with other people, or to wonder what counts as “normal”. This post should answer some of those questions based on data from thousands of people who have used Cycling Analytics.

In this post, we’ll look at what people say their FTP is, and then look at the best efforts that people have actually achieved for a handful of durations. All data is shown for males and females in watts and watts per kilogram. Be prepared to see a lot of charts and tables and numbers.

It’s worth saying a few words about Cycling Analytics users, because they aren’t a perfectly random sampling of cyclists or people overall. The best term that I can think of is that Cycling Analytics users are “serious cyclists”. All the data here comes from people with power meters, and about half of Cycling Analytics users race regularly.

What people say their FTP is

Firstly, let’s look at what people say their FTP is. FTP, or functional threshold power, is nominally the power output that can be sustained for one hour. All the data below and more is shown to Cycling Analytics users in interactive charts on the athlete statistics page, so consider creating an account if this is interesting.

FTP in watts for males

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Ideas, gears, and other things

18 April, 2018 by David Johnstone

There have been a number of updates recently.

There is now an ideas section for submitting new ideas for the site and voting on them. If you have any ideas for new things this site could do, or ideas for how existing features could be improved, feel free to submit them, and also vote on existing ideas that you are interested in. You can “supervote” on your favourite item, which is worth five points instead of the usual one. (You can only have one “supervote” at a time, but you can change which item you’ve “supervoted” for.)

Gear shifting data is now read from FIT files and this can be shown on the main ride chart and on the Gear shifts chart near the bottom of the page. This chart shows the time spent in each gear, and a histogram of cadence for any gear.

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Training plan sequences and zones on charts

12 February, 2018 by David Johnstone

A couple of new features were added to Cycling Analytics today. The main one is the ability to create training plan sequences, which means a sequence of workouts can be saved to the training plan library that can then be added to athlete calendars. This can make creating training plans much simpler when there is repetition.

There are now two tabs in the training plan library. The first is for workouts, which is the only thing that has been in the training plan library until now. The second is for sequences. Sequences can be constructed in the training plan library, or copied from the calendar when the workouts on the calendar also exist in the plan library. For coaches, the calendar that workouts are copied from is the one for the athlete whose calendar they are looking at when they bring up the training plan library.

Once added to the library, sequences are shown at the top of the list of training plans and can be drag-and-dropped onto the calendar, just like workouts. (And there’s an undo button to make life easier if you accidentally add fifty plans starting on the wrong day.)

The training plan library can be exported and imported as a CSV file. This makes it possible to export the library, edit it in Excel, use… continue reading

Power history chart and other updates

10 August, 2017 by David Johnstone

There have been a few noteworthy changes recently beyond the integration of Garmin Connect. In one sentence: The power history chart has been added, laps can now be edited, Garmin Connect users can choose to only have cycling activities imported, and there is an option for the calendar to show plan titles rather than ride titles when they’re linked.

The power history chart shows the best efforts and how they vary over time. By default, it shows the best three five minute efforts (in terms of average power) for each month. It’s quite flexible and isn’t hard to configure to show, for example, the best five efforts of ten minutes for each 60 day period.

It’s now possible to edit laps. This can be done with the “edit ride” page. New laps can be added, unwanted laps can be deleted, and lap times can be adjusted.

There is now an option to only import cycling activities with Garmin Connect. This option is found on the “linked accounts” page. When used, Cycling Analytics ignores FIT files coming from Garmin Connect that are tagged as anything other than cycling, such as running and golf. (Someday, Cycling Analytics will be able to properly handle other activity types.)

Finally, there is a new option for the calendar to always show… continue reading

Garmin Connect

25 July, 2017 by David Johnstone

Cycling Analytics now works with Garmin Connect. Rides uploaded to Garmin Connect are automatically imported to Cycling Analytics when users link their Cycling Analytics accounts with their Garmin Connect accounts. Many Garmin devices are able to automatically import activities to Garmin Connect, making this a very easy way to get rides into Cycling Analytics.

To use this, head over to the Linked Accounts page and click the “Connect” button for Garmin Connect. Once this process is completed, rides will be automatically imported to Cycling Analytics.

Note that the first time a new ride is added to Garmin Connect after linking accounts, this ride and all others from the previous thirty days will be imported into Cycling Analytics. This may result in duplicates, especially if rides were imported from Strava. If so, these can be easily deleted from the rides table.

Recent changes

25 May, 2017 by David Johnstone

A handful of changes have been made to this site recently. Here’s a quick summary:

  • Added highlight option to searching rides table (instead of search only filtering)
  • Added CSV export for rides table
  • Allow clicking on power curve chart time labels
  • Moved training load chart settings to training load page
  • Changed plan text rendering to faster and simpler HTML converter instead of Markdown
  • Show HR and cadence peaks on ride edit page
  • Added support for ThB and SmO2 sensor data in FIT files
  • Raw file download via API
  • Added PWC130 to Flexicharts

In more detail:

The recently introduced table of rides has two new features: Searching can now highlight rides that match the search instead of only showing rides that match the search, and a CSV representation of the data can be shown with the click of a button.

When showing CSV, the data can be separated by either commas or tabs (TSV). Tab separated data can be copy and pasted directly into Excel or other spreadsheets, while comma separated data can be saved in a plain text file and consumed by programs.

The power curve chart has been updated so that the time labels can be clicked on, which is equivalent to clicking on the chart at that time (so it “freezes” the chart at the given… continue reading

Drag and drop training plan creation

12 April, 2017 by David Johnstone

Here’s an easier way to make training plans. Plans can now be dragged directly from the training plan library and onto the calendar.

Clicking on “plan library” now reveals a list of training plans, which can be dragged and dropped onto the calendar. It’s normally taller than in the screenshot above, but I wanted a picture that includes the top and bottom. Holding the mouse over a plan for a moment reveals the details of the plan. Typing something into the “filter” searches for plans by title or group. Clicking on “show full editor” brings up what clicking on “plan library” used to.

The complete list of drag and drop operations supported on the calendar is:

  • Drag from the plan library to the calendar: adds the training plan to the day.
  • Drag a plan from the calendar to another day on the calendar: move the training plan to the new day.
  • Drag a plan from the calendar to another day on the calendar while holding down control/alt/option/command: copy the training plan to the new day.
  • Drag a plan from the calendar to the “rubbish” area at the bottom of the plan library: delete the training plan from that day.

If you don’t see the “plan library” button, it’s probably because you haven’t… continue reading

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This is the blog of Cycling Analytics, a website that exists to help people manage their training and analyse their riding, with a special focus on power data.

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Also, I'm on Twitter as @cyclist_dave.