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Documentation: Completed FAQ content

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.. all questions answered.

.. pulled in R.Chung's paper on VE to reference in
   one of the answers. It gets stored for posterity now.
This commit is contained in:
Mark Liversedge
2013-03-19 10:28:37 +00:00
parent cfd4bd6215
commit 3e09cf24be
2 changed files with 63 additions and 18 deletions
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@@ -10,7 +10,6 @@ The details chart on the analysis view allows you to override metrics on the met
By default the most common metrics are listed, including average HR, distance and so on.
From v3.0 the default setup will also include TSS as a metric you can override here.
If the metric is not there you will need to configure GoldenCheetah to allow it to be shown.
This is simple to do and described in 3.8 below.
@@ -20,16 +19,16 @@ This is simple to do and described in 3.8 below.
Weight can be maintained in 3 ways;
i. Every athlete is setup with a weight value -- this is the fallback value should no
other weight measure be available. It can be found under preferences and athlete.
i. Every athlete is setup with a weight value -- this is the fallback value should no
other weight measure be available. It can be found under preferences and athlete.
ii. The 'Weight' field can be maintained in the details screen. This is found on the
'Workout' tab in the details screen by default. Any entry here will be used for this ride
ONLY.
ii. The 'Weight' field can be maintained in the details screen. This is found on the
'Workout' tab in the details screen by default. Any entry here will be used for this ride
ONLY.
iii. You can download weight from a withings scale. This is performed manually via the
menu option Tools->Get Withings Data. This is then used to update the local measures
database.
iii. You can download weight from a withings scale. This is performed manually via the
menu option Tools->Get Withings Data. This is then used to update the local measures
database.
When calculating W/KG the Activity value is used if present, if not we then fall back to
the last Withing measure that was collected, and if that is not available we then fall
@@ -213,9 +212,14 @@ BikeScore will be accurate, but TSS will be overstated.
3.3 Why does my CP chart show better numbers for a longer duration?
3.3 Why does my CP chart show higher watts for a longer duration?
A higher power average for a longer time is possible if an effort has been "book ended".
If, for example, you did a massive 30 second effort, followed by freewheeling for 29:30
then another massive 30 second effort, then your best average for a continuous 30 minutes
would in fact be lower that your best average for a continuous 30minutes and 30 seconds.
(Thanks for Jon Hill from the Golden Cheetah Users mailing list for this example).
<hunt down the mailing list post with some good examples for this one>
3.4 Can I set a different CP/FTP for different reasons e.g. CP/FTP on a trainer?
@@ -366,9 +370,11 @@ shown on. To remove a field set the field tab to blank.
There are a number of fields that when maintained in the details screen will be used
elsewhere in the code to calculate metrics or for other purposes.
Some examples include; Weight - used in W/KG calculations, Sport and Workout code are
used when exporting to other file formats, Identifier is used to assign a UUID to the
activity when it is uploaded to online services and so on.
Some examples include;
Weight - used in W/KG calculations, Sport and Workout code are
used when exporting to other file formats, Identifier is used to assign a UUID to the
activity when it is uploaded to online services and so on.
There is a full list of special fields and their meaning in the Golden Cheetah user
guide appendices.
@@ -426,7 +432,12 @@ using a free service they do not let you retrieve your data.
5.3 Why is data uploaded to Strava all wrong?
<ask Damien for a response to this one>
In general Strava will only use GPS data. If your ride does not contain GPS data then
Strava is not likely to play nice. In addition many of the other data series will be
ignored. This is related to Strava data processing in V2.0 of their API.
We always upload as TCX since the JSON flavour of their API appears to have less
functionality.
@@ -436,7 +447,7 @@ The upload to Google Calendar uses their CalDAV API, and as such needs to specif
collection. This means when entering the details in the passwords pane of preferences
you should use the following for the caldav url:
https://www.google.com/calendar/dav/xxxx@gmail.com/events/
https://www.google.com/calendar/dav/xxxx@gmail.com/events/
Where xxxx is your username. The username will need to be repeated in the username
field and obviously set the password too.
@@ -480,13 +491,47 @@ prior '2' is a month 2 months ago, whilst 'This' 'month' and prior '1' is last m
7.2 How does the mean max chart calculate CP when showing power?
<read code! and update.. think its just 3min and 20min but need to check>
The CP algorithm searches your best power for two durations; for anaerobic efforts it
looks between 15s and 1min, for aerobic it looks for best efforts between 10mins and
an hour.
Once it has found these two best values it will curve fit the two to enable the
60min value to be extracted. Bear in mind this is a theoretical number and as described
above is applicable to the BikeScore algorithm. The value for FTP that the TSS algorithm
requires is simply the highest value for 60mins for the time period, assuming you have
performed a 60minute test recently.
7.3 How should I use Aerolab?
<summarise recent discussion on list from Robert Chung>
The following is a brief piece of advice from Robert Chung, from a discussion on the
Golden Cheetah Users mailing list:
Ideally, you'll want calm conditions (both in terms of wind and traffic) but here's a
quickie test you can do just to get a handle on what to do. Try to find a loop without
stop signs, or an out-and-back with maybe a little dip or something in the middle. Make
sure you won't get hit by a car and have good sight lines. I just go around my block a
few times. Do a loop in the drops, then another loop faster, then a loop slower; then
repeat with your hands on the hoods.
Weigh yourself and the bike and ballpark the air density.
See whether you can come close to modeling the "true" elevation profile by sliding the
CdA slider around. Even with this informal test, as long as the wind isn't blowing too
hard, you ought to be able to see a difference between the loops where you were in the
drops and the loops where you on the hoods, and to spot little bumps and dips in the road.
There is also an overview of Virtual Elevation to measure aerodynamics in this
YouTube video from the power seminar at Interbike 2011 given by Jim Meyer the founder
of Quarq:
http://www.youtube.com/watch?v=b8tJnFE_BFg&feature=youtu.be&t=27m58s
Finally, Robert Chung's original paper is included in the docs section of the GoldenCheetah
repository, you can it up here:
https://github.com/GoldenCheetah/GoldenCheetah/blob/master/doc/contrib/ChungVE.pdf