I may have run into these problems. I did calibrate the watch when I
first got it at a local HS track but I think I messed up. I trained
for three months pushing as hard as I could but never got comfortably
below 8 minute miles. Then I ran a race and realized the watch was a
full minute off on each mile split. Was a great feeling to pass the
first mile below 7 minutes - in fact I pulled back thinking I went out
too fast; after the 5th mile it was a big "ahh ha!" Anyone know what
the default bodytype Nike set the calibration at?

I still think it is more accurate then a GPS - I have one I use for
hikes - and while it is great for tracking place it is somewhat
inaccurate on distance because it doesn't account for altitude (I
assume).

Jim Charanis
full review of Triax Elite:
http://www.charanis.com/forum/viewtopic.php?t=8



--- In niketiming@yahoogroups.com, "bobkalish" <rkalish@o...> wrote:
>
> I've also found the timing to vary greatly with speed. I like your
> idea of calibrating for speed workouts which makes it conservative for
> everyday runs. It's difficult to run a 6:30 pace when the watch
> tells you it's only a 7:00 pace and you push way too hard.
> Also, has anyone noticed that when you put a fresh battery in, the
> calibration is way off (goes from 1050 to 1200). After one or two
> runs, it seems to revert to the prior values?
> Bob
>
> --- In niketiming@yahoogroups.com, "markbadgers" <mark@k...> wrote:
> >
> > I have also seen large changes when I run fast or slow. When I run
> > below about 8:00 min/mi, the calibration is very linear (+/-2%).
> > However, when I continue to reduce my pace, there is a large change up
> > to 15%. The description of the test is below in the link.
> >
> > It is interesting to see how much the calibration is off for me at low
> > speeds. My form definitely changes as I increase the pace from a
> > mid-foot striker to more of a fore-foot striker as I go faster. I
> > believe that this transition must be occurring between 8:00 and 9:00
> > min/mi for this test. I have not validated the data, but I plan on
> > running the same test in six weeks to track improvement.
> >
> > This does make me think:
> > * I may need to calibrate based on the type of run that I am
> > doing. However, this is a lot of work. This would be a suggestion for
> > a Nike change is that they allow you to place a calibration for a
> > given workout. This would help for shoe changes (if you use a lighter
> > shoe for speed work and a heavier shoe for long distance).
> > * I will modify my calibration so that it is accurate at high
> > speeds. Then at low speeds, I am running father than the Nike SDM
> > states. This way I am conservative in my planning.
> >
> > Mark
> >
> > The above is a partial repost from my running log.
> > http://www.krisandmark.com/running/archives/2004/11/10/187/
> >
> > --- In niketiming@yahoogroups.com, "ROBERT PHILLIPS"
> > <robertphillips@z...> wrote:
> > > I have had different results with distance depending on if I run
> > fast or run slow.
> > >
> > > Export a text file to excel that you have stopped several times on a
> > run. The present software needs a lot of work.
> > >
> > > Also look at old posts for links to person who developed shoe
sensor.
> > >
> > > I have imported the text file to excel and played what if with data,
> > it looks like data is collected every 10 seconds, but speed is
> > averaged out over a longer period of time.
> > >
> > > Best thing about it is the graphing of different runs on the same
> > chart, good for determining what one or two or none rest days do for
> > given race pace for the same course.
> > >
> > > Bob
> > >
> > > Bob
> > > ----- Original Message -----
> > > From: fwolthausen
> > > To: niketiming@yahoogroups.com
> > > Sent: Tuesday, November 02, 2004 3:26 PM
> > > Subject: [niketiming] pedometer algorithm
> > >
> > >
> > >
> > > Just tried the Triax Elite on a hilly course. It sure seems to
> > > record the distance accurately, but it would be nice to know about
> > > the algorithm it uses for adjusting for stride differences up and
> > > down hills. Anybody know how it works?
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Sponsor
> > > ADVERTISEMENT
> > >
> > >
> > >
> > >
> > >
> > >
> >
>
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