Thank you for purchasing through links and ads on this site.
OWC / MacSales.com...
diglloyd Deal Finder...
Buy other stuff at Amazon.com...
Get up to 16x more storage and 2x the speeds of the original drive
Handpicked deals...
$2998 $2498
SAVE $500

$350 $280
SAVE $70

$1598 $998
SAVE $600

$399 $329
SAVE $70

$1069 $869
SAVE $200

$1299 $899
SAVE $400

$1499 $999
SAVE $500

$1499 $1019
SAVE $480

$1799 $1349
SAVE $450

$3698 $2998
SAVE $700

$2397 $1897
SAVE $500

$1199 $898
SAVE $301

$1299 $1169
SAVE $130

$4499 $3999
SAVE $500

$1399 $1099
SAVE $300

$1499 $1299
SAVE $200

$4499 $3149
SAVE $1350

$2299 $1599
SAVE $700

$1799 $1349
SAVE $450

$2998 $2498
SAVE $500

$2199 $1999
SAVE $200

$430 $230
SAVE $200

$3399 $2199
SAVE $1200

$6299 $3599
SAVE $2700

$400 $280
SAVE $120

$1499 $1019
SAVE $480

$1279 $719
SAVE $560

$1699 $1549
SAVE $150

SRM Power Smoothing

Last updated 2012-03-21 - Send Feedback
Related: bicycle power meter, Road Bikes, SRM

Even the minimum smoothing in the SRM Mac software (1%) hides power spikes and dips, which removes a lot of information about the actual workout intensity

In the example below, the smoothed graph shows that power never exceeded ~290 watts for the entire 12 hours (green line for power). Worse, the many power dips completely disappear in the smoothed graph. The minimum smoothing is still very heavy-handed.

The unsmoothed graph shows important insights into variability in the power output; the smoothed graph makes it appear that pedaling never stopped, even on 10 minute descents where pedaling was absent. This is highly misleading when analyzing power output.

It’s not clear what “1%” means in the context of an ~12 hour ride (does that mean smoothing 7.2 minutes out of a ~720 minute ride?). Perhaps. Because that would explain the loss of all highs and lows.

Smoothing really ought to be over some number of samples; one could choose 2, 5, 10, 30 second smoothing, and the resulting graph would then be much more revealing of the true effort, independent of the length of the exertion. Other graphical means could also be used to add subtle hints to the data “shape”.

Click for larger graphs.

Death Valley Double 11:45 double century — SRM graph with smoothing off
Death Valley Double 11:45 double century — SRM graph with smoothing on

 


MacPerformanceGuide.com
View all handpicked deals...

Beats by Dr. Dre Studio3 Wireless Bluetooth Headphones (76ers Blue / NBA Collection)
$350 $280
SAVE $70

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__