Wrist Running Power

Andi Buzer

From what I have read here running power for the s9pp gets calculated from GPS and Baro data. Is there any other hardware that’s new to the s9pp which is used or can we have hope to get the pleasure of running power on the s9p too ?

DMytro

@Andi-Buzer I guess it’s the new baro hardware, that is exclusive to s9pp.

isazi

@Andi-Buzer running power, to my knowledge, is not coming to the S9P.

Łukasz Szmigiel · S9PP 2.40.38

I was always thinking that wrist-based running power is using a combination of GPS and hand movement (acceleration) to calculate the power (and baro for uphill, downhill). Is it just GPS and baro?

Egika

@Łukasz-Szmigiel there is quite a few variables going into the calculation.
As power is the effort needed to move your body along the road or up a hill, at least speed, altitude change, weight will go into the equation.
Plus there is acceleration and deceleration und possibly efficiency (guesstimate from arm movement).

What it cannot take into account is head or tailwind though…

Łukasz Szmigiel · S9PP 2.40.38

@Egika lack of wind in calculation is a bummer. Also - changing of effort due to ground surface change.

Brad_Olwin

@Łukasz-Szmigiel said in Wrist Running Power:

@Egika lack of wind in calculation is a bummer. Also - changing of effort due to ground surface change.

The wind adds or detracts very little to power unless the wind is very strong and would affect HR as well. This is true from Stryd’s pod. I am not sure wind is worth it. Instantaneous power IMHO is not very useful, but the zones definitely are. Changes in your direction vs. wind would have to be near instantaneous.

Łukasz Szmigiel · S9PP 2.40.38

@Brad_Olwin well, this is the case. I’m not thinking about a lil windy, but mouthful of wind. I usually run through the fields, and there are hardly any trees, and it’s flat as a pancake. I can easily go +/- 20 HR if I’m with or against the wind. But the power stays the same. Just curious - would Stryd pick it up?

Bulkan

In my experience wind added more noise and inconsistency during runnings when is a wind from one side… I’m not a huge fan of wind stride pod for that reason and the valued added is not so important.

Yes wind exists and it is there but I don’t find it useful.

Łukasz Szmigiel · S9PP 2.40.38

I think that we need new sensor for wind.

suzzlo

@Łukasz-Szmigiel said in Wrist Running Power:

Just curious - would Stryd pick it up?

https://blog.stryd.com/2019/06/27/announcing-the-new-stryd/

Łukasz Szmigiel · S9PP 2.40.38

@suzzlo interesting, do you have any insights how it compares to wrist based power?

Brad_Olwin

@Łukasz-Szmigiel said in Wrist Running Power:

@suzzlo interesting, do you have any insights how it compares to wrist based power?

I have done a lot of testing with 9PeakPro with the Stryd Pod (generation prior to wind). They are very similar. The major differences I saw were on very hard VO2 Max intervals the Stryd had higher max power and slightly higher avg power. Not enough to change the Critical Power calculations. Wrist-based power is much more convenient and always there. I did not like having to deal with the pod all the time.

zhang965

Brad_Olwin said in Wrist Running Power:

@Łukasz-Szmigiel said in Wrist Running Power:

@suzzlo interesting, do you have any insights how it compares to wrist based power?

I have done a lot of testing with 9Peak and 9PeakPro with the Stryd Pod (generation prior to wind). They are very similar. The major differences I saw were on very hard VO2 Max intervals the Stryd had higher max power and slightly higher avg power. Not enough to change the Critical Power calculations. Wrist-based power is much more convenient and always there. I did not like having to deal with the pod all the time.

WOW, s9peak has wrist power. I see I see.

herlas

Yesterday had a very windy first part of my easy run, this was well captured by my Stryd pod, as you can see 6% of my total power output was added by wind resistance

I’d say if you’re just getting started with running power and don’t have a Stryd pod, the wrist based power is a good start

Brad_Olwin

@zhang965 Sorry about that, they look the same and I can forget which one I have on my wrist. Thanks for the correction. I fixed the post.