M a n u a l D a t a r u n P r e m i u m , v e r s i o n 1 . 7 0
Pagina 10
Normalized power
This is only available for the
Fenix 5x
and the
Fenix 5 plus
series. I included Normalized power as
people kept asking for it, but wasn’t sure what the use was during an activity. Coach Steve Palladino
however explained it in a post the Stryd Facebook page:
Normalized power is a metric that was developed out of necessity for cycling power analysis and
interpretation, because cycling power output can be quite variable. For example, in cycling, you can
be in the group, coasting at times, soft pedaling at times, and really grinding at times. This type of
ride would result in a highly variable power file, typically with a NP > than AP. In such instances, the
Variability Index (the ratio of NP:AP) is >1.0. This is rather typical in most cycling. A Variability Index
of 1.0 is typically only found in isopower interval/tempo training and in time trial racing.
Runners do not coast. Maintaining pace is a primary driver in running. Consequently, in most running
scenarios where a) running is on flat to rolling terrain, *and* b) the running is
constant/uninterrupted, Variability Index = 1.0 or very very close to it. With a Variability Index = 1.0,
NP = AP. IOW, in most running scenarios where running is on flat to rolling terrain, and the running is
constant/uninterrupted, NP carries no added value over AP.
However, in scenarios like trail racing, or in those like running with planned regular walk breaks, then
it is possible that NP might be > AP. In these cases, race pacing and planning might be better done
with NP as a global constraint, rather than AP.
In contrast, for a runner that otherwise does not trail race, or incorporate walking breaks into their
racing/training, asking for NP just because it is available for cycling really has no purpose.
For example, here are three recent marathon results:
11.
AP 214, NP 214, VI 1.000
12.
AP 277, NP 278, VI 1.004
13.
AP 338, NP 338, VI 1.000
In contrast, in cycling it is not unusual to see VI > 1.10. Seeing NP on the watch, as mentioned, may
serve a purpose in applications like trail racing and racing with planned or frequent walking breaks.
(
https://m.facebook.com/groups/1538096923155033?view=permalink&id=2012163545748366
Intensity Factor and Training stress score
See
https://www.trainingpeaks.com/blog/running-training-stress-score-rtss-explained/
