POWER

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Howard

Senior Member
Ooof. Pricey.

Looks a bit like the Joule? As you can see I have no experience it.

Actually it was OK - bought used from the US attached to a pair of Hollowgram SI SL cranks. About £800 all in, which isn't bad given the cranks rings and BB, alone, bought new, at the time, would cost that.

That's +/- 10%.
Who knows?

I agree I doubt it would be any more help. It would be nice to have power data associated with Garmin traces but I can live without that. I was more interested in what everyone else is doing because I'm really just starting to use it in anger.

An overview of workflows would be really useful, actually. Anyone care to help me out?
 

Rob3rt

Man or Moose!
Location
Manchester
Workflow in what respect?
 

Howard

Senior Member
Something like

Every ride I...
a)
b)
c)

Every week I...
a)
b)
c)

Then to understand the changes in performance I...

At the moment I'm at the point where I have a basic training plan and am collecting data. Now comes the tricky bit :smile:
 

Rob3rt

Man or Moose!
Location
Manchester
Something like

Every ride I...
a) Pump my tyre up to the same pressure
b) Lock it in the turbo with the same number of turns on the resistance unit (mine is a QR so this is not tedious)
c) Zero the power meter
d) Warm-up for 10-15 minutes, progressively shifting up over the 1st 5 minutes until riding at ~70% FTP
e) Re-zero the power meter incase it has drifted as the room warms up etc, note or remember this value
f) Do the planned session
g) Do the reverse of the warm-up
h) Check the zero offset on the power meter again and compare to the value in e) to ascertain the extent of any drift throughout the session (this gives confidence in your data)
i) Lay on the living room floor for 15 minutes until the nauseous feeling subsides
j) Drink milk & put away the kit
k) Stretch
l) Shower
m) Plug the Garmin in, upload to Garmin Connect (don't know why, suppose it is a decent backup and can be used as a quick reference), Upload to Strava (to make my friends sick when they see I have been smashing it on the turbo while they have been supping beer again), upload into Golden Cheetah (for actual analysis)
n) In Golden Cheetah I do various checks on the data, depending on the session, for example, lets say a 6x3 min session, I will check the average power of each interval, hopefully they are very close, if there is a notable drop off, I will calculate the drop off with respect to the 3rd interval to check if I should have stopped earlier. I usually refer back to a couple of previous sessions of the same type to see if my figures stack up.
o) If it is a race (I race TT's), I usually check average power, normalised power, intensity factor, variability index (hopefully close to 1). Check my pacing, so I will look at the laps and compare my power for each lap, looking for good pacing, i.e. slightly reserved start, good steady effort and a build at the end. Look for points where I may have lost time. Compare out and back times.
p) Make any notes about RPE, conditions, any external factors (eg. being held up by traffic), official race result, time position, any prizes, any other notable things while I still remember them clearly.


Every week I...
a) Check weekly TSS
b) Look at the PMC
c) Decide what, if any changes need to be made in the following weeks training plan

Then to understand the changes in performance I... look at my race results, am I going faster? Is my placing relative to the number of riders better? Who was riding? Am I closing the gap on faster riders? I also look at the aerobic power tab to see the trends for 5, 20 and 60 minute power intervals. If not racing, repeat the FTP test protocol as and when required (once a month or every 6 weeks maybe), this is not required as often when racing as a 25 mile time trial is good for this, I race a 25 at least once a month so will check normalised power and take this as my new FTP, unless it looks suspect, like I had a bad day, or the temperature was bonkers etc.

At the moment I'm at the point where I have a basic training plan and am collecting data. Now comes the tricky bit :smile:

TBH, I don't do a huge amount of analysis, it is just not needed IMO. I would like to be able to use aerolab a bit more to check aero changes but it seems so fickle and no-one has put out a convincing document saying, do this, this and this, the result will be given by. You can get 95% of the benefit from a power meter by using only 5% of the analysis tools available :tongue:
 

Howard

Senior Member
Hey Rob3rt - thanks for sharing that. Really useful. I've been tentatively playing with training peaks but I think I need to check out GC too.
 

Rob3rt

Man or Moose!
Location
Manchester
Training peaks should offer the same, or greater levels of analysis as Golden Cheetah, Golden Cheetah is good though, although a bit less polished, as you would expect from a free piece of software.

I would use WKO+ still if it didn't cost £80 that could be spent on travelling to a couple of fast courses!
 

Howard

Senior Member
Not sure I want greater levels of analysis - I'd just like two things at the moment -

i) am I collecting useful, reliable data, and if so
ii) being able to detect changes in performance, i.e. is my watts/kg going in the right direction or is it static / wrong direction :smile:
 

Rob3rt

Man or Moose!
Location
Manchester
The data should indeed be useful and provided it is repeatable, then it should be reliable as a training tool and for self appraisal on the most part as even if the values are not spot on accurate, they will still show trends etc. As for absolute values being correct, you could check this is reliable by doing a static torque test to check the calibration, if the calibration is off, there are various places you can have it recalibrated, cyclepowermeters for one (I would recommend them, very good service, fast turnaround and knowledgeable staff including coaches, Bob Tobin and very good racers, Matt Clinton). You will also want to be making notes of zero offset values and checking they do not change too much throughout a session. You would need to check what the spec says as to a healthy drift or absolute zero offset on a SRM, I use a Quarq.

Detecting changes should be pretty easy by reviewing your power over various durations (Golden Cheetah plots this for you, based on your best 5 performances over that duration, per month). You can work this back to W/kg for the different durations and see if it is increasing.

If you don't already have it, I would advise buying Training and Racing with a Power Meter by Hunter Allen and Andrew Coggan. This will cover some analysis that is useful to road racers etc that I have no clue about, such as finding "matches" etc. Dr Andrew Coggan is active on various forums like TTF and the Wattage groups and usually responds to queries.
 

Howard

Senior Member
Monitoring the offset was not something I had considered. I'll add that to pre / post flight. Good advice. The headunit and spider are both due a new battery later this year, so it will go off to cyclepowermeters for service / calibration.

Training and Racing with a Power Meter -> on the kindle. Reading material for downtime whilst touring in France next week. Sadly no wattage to me measured there :smile:
 
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