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Development Team Member
Posts: 46

I have done cross-country skiing (skating technique) assessment using
two moxy sensors:
1. The first sensor was attached to my right quad (LV).
2. The second sensor was attached to my right tricep.

Note: max HR = 182

As per Juerg's suggestion, I have done the following protocol:
1. No warm up
2. 8 minutes at HR=110 (0 - 8 min)
3. 8 minutes at HR=125 (8 - 16 min)
4. 8 minutes at HR=140 (16 - 24 min)
5. 8 minutes at HR=155 (24 - 32 min)
6. 8 minutes at HR=170 (32 - 40 min)

I tried to keep HR as steady as possible, but it proved challenging
at times due to varying terrain.

Afer this, I had a 3 minute active recovery and I continued my planned training session:
5 x 5 minutes in traditional "Zone 4" with 2 minute recovery in between.
15 minute cool down period followed.

The heart rate graph is attached as well as csv files for two sensors. Here are the plots
for right LV:


I have done a VO2 and blood lactate test on rollerskis (on a treadmill), so I do have
various "lactate threshold" values as measured in that test. I can post them if needed.
I can also provide .fit file with the heart rate data.

Three days later I have completed another interval trainng session with one sensor
attached to LV and the other on RF on the same leg. If there is any interest, I can post that
data as well in a separate thread. I found the data from this second workout quite 

Any feedback is welcome. Thanks.

NOTE: The assessment started at around 07:50 (actual timestamp). So, any data in the 
csv files before timetamp 07:50 should be discarded.

Attached Images
Click image for larger version - Name: XCAssesment.jpg, Views: 11, Size: 155.42 KB 

Attached Files
csv Dec29_RQuad.csv (113.76 KB, 8 views)
csv Dec29_RTricep.csv (119.99 KB, 4 views)


Development Team Member
Posts: 1,501
Nice  work  and  really well done  for  the first  time   with this idea.  BUT  
 as usual  rifts some  questions as I may make a  mistake. I look at the possible physiological reactions of  the step  assessment and the 3 min rest followed by 5  interval 5 min 2 min rest.
 The 5 initial step  would be on paper  8 min each . So  it looks to me the  start of the  step assessment was far  after the MOXY got started 
 See picture. again possible a mistake, but the dotted line looks  that  you started   the  steps
bias all inclduing steps  and   5 intervalls.jpg 


Development Team Member
Posts: 46
I cleaned up the data some more, tried to line up HR and SmO2 data and
indicated the intensities and intervals:
5 x 8 minutes + 3 minute active recovery +
5 x 5' intervals (target HR: 167 - 170) with 2 active recovery +
15 minutes cool down

Here's the plot for quad sensor (LV):


Here's the plot for triceps sensor:


Development Team Member
Posts: 1,501
Thanks  for the great  work.
 My   question was,  how  far off I am  from where I think the  assessment started  see my graph and whether the MOXY  was on  for a  while collecting data s  as you prepared  for the assessment.
 But never mind I will  show what I see no matter  whether I am  wrong with the timing as  the data s show some very nice  information's. Will be back later  this week  depending on time   for  more in depth  view.

Development Team Member
Posts: 46
> I think the  assessment started

For LV Quad, the csv data begins at 07:21:52 while the actual assessment
starts at 07:50:21. Therefore, the assessment would start at time 1709.
Your indicated start in the plot is off by a little bit (ie, it should be t 1709).



Development Team Member
Posts: 1,501
Thanks  sounds  great  and it does not matter on a seconds as we look the real physiological  start versus  the actual   time  and in live on snow   situations  you will see that  often the time  is not reflected  perfect in the load,as  you will see and in sports like sped skating and  skiing or where we glide, it is  even more  a  difference between  physiological action and timing.
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