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May 18 2017

An exercise in fading

Wednesday

I did a short outing in the double with a new rower. I heard about this new colleague who had been an excellent rower in the past. Talked to him and got him enthusiastic to try rowing again.

The caveat. He had a severe motorbike accident 8 years ago, has an arm and shoulder full of titanium, and has spent 100% of his energy on working since then. This was his first row since the accident.

It was a fun experience. The guy clearly knew what he was doing, but he will need a few rows to get back his former level of technique. Also, he was quite exhausted after just the warming up. I guess that calibrates my level of fitness. It’s a good reminder. Sometimes I think my fitness is dropping, but I guess I am always far from the absolute minimum.

By the way, it is my experience that base fitness comes back very quickly with bodies that have been exposed to intensive training when they were young. If you have such a body (which I do), congratulations!

Thursday

A morning row. I was supposed to take the bag with boat and scull covers to the club, because Romana wants to ride her bike this afternoon, and she would prepare the boats for transport to Hodonin, where we will be racing, coming weekend.

At 6am I am capable of getting up, getting my rowing bag and my work stuff, get a rudimentary breakfast in my stomach, and drive to the rowing club. At the last traffic light before the club, I realized I had forgotten the bag with boat covers. Oh well. Romana will just remove the riggers this afternoon, and I will have to come earlier to put the shells in the covers and load them on the trailer.

I forgot to read my training plan, so I headed over to the announcement board to read the Juniors/U23 training.

My training plan called for 6x250m/2′-3′ pause. The U23 training plan called for 4x start plus 15 strokes, plus 2x500m/500m, with the first 500m at 30spm, and the second one at 35spm.

I liked that. So, I did it.

The warming up plus a 2k with 4 practice starts followed by 15 strokes:

myimage (2)

 

The end of the practice starts brought me to the finish line of the 2k course. I rowed back to the start, focusing on technique. So that brought me to 5k of distance covered.

Now it was time for the 500s. Here is the result:

myimage (3)

The first 500m was performed well. The second one, I don’t know. I probably hit too high power values for this one, and I faded dramatically. Looking at the metrics charts below, I am not pleased with how the effective length drops in the second half of the second interval. It was really a dramatic exercise in fading.


Workout Summary - media/20170518-0735410o.csv
--|Total|-Total-|--Avg--|-Avg-|Avg-|-Avg-|-Max-|-Avg
--|Dist-|-Time--|-Pace--|-Pwr-|SPM-|-HR--|-HR--|-DPS
--|01500|06:28.0|02:09.5|245.8|27.1|165.0|186.0|08.6
W-|01000|03:46.0|01:53.5|328.3|31.9|177.4|186.0|08.3
R-|01000|05:06.0|02:33.4|150.3|21.4|150.7|186.0|00.0
Workout Details
#-|SDist|-Split-|-SPace-|-Pwr-|SPM-|AvgHR|MaxHR|DPS-
01|00500|01:55.8|01:55.8|312.2|29.9|175.5|182.0|08.7
02|00500|01:51.2|01:51.2|345.2|34.0|179.3|186.0|07.9

And a few charts with comments:

I also had fun looking at the lack of improvement in my metrics over the past weeks. No conclusions yet, except that it was fun to do it and I am glad rowsandall.com gives the opportunity to use this type of charts to monitor your athlete’s (lack of) progress. I filter away all strokes marked as “rest” and I also took the liberty to remove all strokes below 450 Joule per stroke, as they are either (unmarked) rest paddle, technique work, or short stroke exercises.

Tomorrow: Boat trailer loading. Boat trailer drive to Hodonin, then a mixed double row with Romana.

By sanderroosendaal • Uncategorized • 2 Comments • Tags: ANC, ANC training, OTW, race prep, rowing, training

bokeh_plot1.png

May 16 2017

Sunday – Wednesday: Starts in the double and steady state in the single

Sunday

The international youth regatta continued, but Romana and I had some time to get in the double after we had sent the girls quad off to their start. Of course we only had part of the lake to row, because we didn’t want to get too close to the racing action.

Coming Sunday, we’ll row our first Mix Masters 2x race of this year, and we haven’t really done starts practice. So that is what we did. I did the 4x250m mini session, doing the first and third 250m interval from standind starts. Wow, we have some work to. On starts, and also on the higher rate stuff.


Workout Summary - media/20170514-175645-Lenkas SpeedCoach 20170514 0854amo.csv
--|Total|-Total-|--Avg--|-Avg-|Avg-|-Avg-|-Max-|-Avg
--|Dist-|-Time--|-Pace--|-Pwr-|SPM-|-HR--|-HR--|-DPS
--|01000|03:41.0|01:51.0|000.0|32.8|160.0|178.0|08.2
W-|01000|03:42.0|01:51.1|000.0|32.8|160.0|178.0|08.2
R-|00000|00:00.0|00:00.0|000.0|00.0|000.0|178.0|00.0
Workout Details
#-|SDist|-Split-|-SPace-|-Pwr-|SPM-|AvgHR|MaxHR|DPS-
00|00250|00:57.1|01:54.2|000.0|31.1|147.6|167.0|08.4
01|00250|00:55.7|01:51.5|000.0|33.5|163.4|176.0|08.0
02|00250|00:53.6|01:47.2|000.0|34.0|159.4|174.0|08.2
03|00250|00:55.8|01:51.6|000.0|32.6|169.8|178.0|08.2

myimage (1)

After the 250m intervals, we did a few more starts and then we positioned ourselves at the 1500m mark to watch the final 500m of the girls quad. They came in fourth place in the A final, kind of where we expected them to be.

After the short row, I did a 25 minutes run, and then I tried out the Stand-Up Paddle board for the first time. It was nice, but I didn’t fall in love with it.

Around lunch time the racing was stopped for an hour because of a thunderstorm threat. The threat didn’t materialize luckily but I was happy that it was monitored and the race organization managed clear communication around it. It’s not an easy decision to make and implementing a pause and getting everybody off the lake is not easy, but there really is no alternative. I have witnessed a few races where there was no weather plan, and it is not a nice feeling when wind gusts, rain and lightning start and you have crews on the water. Actually, it is quite scary.

Monday

Too busy to row. The only rowing related activity that I managed was registering a few starts at the 2017 World Rowing Masters Regatta (in Bled, Slovenia, in September). I have registered mix C 2x, C 1x and B 1x. I’d like to row one race in the double as well, but I am a bit unlucky with doubles partners this year, so I will wait a few more weeks before registering those.

On rowsandall.com, I launched some new functionality related to box charts. Team managers can now very easily see progress of key metrics for all their team members. I discussed box charts over on the Analytics blog. I got the idea for this after doing this blog post. The other thing that I implemented is making box plots by picking workouts from a searchable list, as opposed to doing it for all workouts in a date range. This enables you to select steady state rows only, for example.

Here is an example of the result, looking at Wash metric for the past few rows.

bokeh plot (1)

 

Tuesday

Look at that Wash plot above. The last box, that is today’s session. This morning, I did some steady state rowing in the single. I decided to head to the Castle, and the plan was to row 12km of the 14km row on the river. Unfortunately, I had to turn around just past the castle, because there were too many tree branches in the water after Sunday and Monday’s thunderstorms.

So what about Wash? I wanted to use this Steady State row to focus on Wash and record low values. I know some of you are asking why I focus on Wash so much when my values already compare quite well with the benchmark? The reason is that it is one of the few metrics where the stroke by stroke live feedback on the SpeedCoach tells me that I am sitting up tall and doing the back swing correctly. In good conditions, I can consciously row with a Wash value between 9 and 11 degrees. The trick is to continue to do this when I get tired or the water gets rougher. Here is the story of today:

bokeh plot (2)

See how in the first 6km I manage to stay below 12 degrees for most of the time? This was helped by a slight headwind and super flat water. Because I had to turn early, I rowed the final 4km on the lake and the southern end of the lake was getting choppy. Rowing on a restless lake in tailwind, I suddenly found myself unable to produce those 11 degree and lower of Wash strokes. I am still happy that on the box plot it shows as one of the better rows, in terms of a low median, a small box and short whiskers compared to the other rows. It proves that you can focus and improve these metrics.

myimage

I wash pushing a bit harder than I should in the first half of the workout. You can see from power, work per stroke and average drive force how I paid for that. During the workout, the numbers got smaller and smaller.

The Empower Oarlock disconnected during the cooling down and I decided to not try and reset it, so the data are flat in the final 1km. Heart rate drift was 12%.

By sanderroosendaal • Uncategorized • 1 Comment

myimage37.png

May 13 2017

Saturday – Experimenting with footstretcher setting

There was no time for a long outing today. There wasn’t even the possibility, because the Youth regatta was in full swing and the lake was closed for other rowers.

I wanted to test some foot stretcher settings, so I figured that it was OK to use a remote corner of the lake that is outside the main traffic patterns.

There has been some discussion on rec.sport.rowing on how to set the footstretcher, and about speed gains to be achieved by setting the foot stretcher towards the stern (larger catch angle, more efficient stroke, etc). I decided to do an experiment.

Row 2x250m (one in each direction, with 250m “rest” to turn) with each foot stretcher setting. Try to hold 300W as closely as possible. Measure total time over 500m. Running start. Stroke rate free.

Today there was almost no wind and the water was flat.

The 300W is submaximal, which makes it easy to hold steady and focus on technique. So after a few minutes of warming up, I set off for the first set of 2x250m. Then I changed the footstretcher as much as possible towards the bow (where I was limited by my backstops which I didn’t want to change OTW), and repeated the experiment.

I did have the feeling that there was slightly more “light wind” than in the first run, though. This may have destroyed the experiment.

The second set with the bow-wards setting felt weird, and I had a lot of room between my belly and my scull handles at the tap-down. Here are the overview graphs:myimage (37)

 

myimage (36)

Here are the Empower force curves:

 

So only a 5 degree shift in catch and finish angles for what feels very different in the boat. The stroke felt much lighter with the bow-ward setting. Now on to the verdict.

My “normal” setting (larger catch angle):


Workout Summary - media/20170513-144854-Sanders SpeedCoach 20170513 0929amo.csv
--|Total|-Total-|--Avg--|-Avg-|Avg-|-Avg-|-Max-|-Avg
--|Dist-|-Time--|-Pace--|-Pwr-|SPM-|-HR--|-HR--|-DPS
--|00500|01:58.8|01:58.7|302.9|29.4|159.1|171.0|08.6
W-|00500|01:58.8|01:58.8|302.9|29.3|159.1|171.0|08.6
R-|00000|00:00.0|00:00.0|000.0|00.0|000.0|171.0|00.0
Workout Details
#-|SDist|-Split-|-SPace-|-Pwr-|SPM-|AvgHR|MaxHR|DPS-
00|00250|01:00.8|02:01.6|306.9|29.6|154.5|167.0|08.3
01|00250|00:58.0|01:56.0|298.7|29.1|163.9|171.0|08.9

And the “bow-ward” setting (shorter catch angle):


Workout Summary - media/20170513-144939-Sanders SpeedCoach 20170513 0938amo.csv
--|Total|-Total-|--Avg--|-Avg-|Avg-|-Avg-|-Max-|-Avg
--|Dist-|-Time--|-Pace--|-Pwr-|SPM-|-HR--|-HR--|-DPS
--|00500|01:59.0|01:58.9|304.4|29.4|161.5|174.0|08.6
W-|00500|01:59.0|01:59.0|304.4|29.4|161.5|174.0|08.6
R-|00000|00:00.0|00:00.0|000.0|00.0|000.0|174.0|00.0
Workout Details
#-|SDist|-Split-|-SPace-|-Pwr-|SPM-|AvgHR|MaxHR|DPS-
00|00250|00:59.8|01:59.6|304.3|29.7|157.3|170.0|08.4
01|00250|00:59.2|01:58.4|304.5|29.0|165.7|174.0|08.7

For completeness, the SpeedCoach itself reports 1:58.8 time at 29.0 spm and 301W for the “normal” setting, and 1:59.0 at 29.0spm and 306W with the bow-ward setting.

So almost the same total time with a power difference of 1% (5W at most). This is in the order of magnitude that I was expecting, and the question is whether the measurement system is accurate enough to measure such small differences.

But it was fun to do, and I am going to stick with my “normal” setting with the larger catch angles.

By sanderroosendaal • Uncategorized • 1 Comment • Tags: experiment, OTW, rigging, rowing, single

3dprofile.png

May 13 2017

Friday: A short run

I stayed at work too long, so my window for OTW rowing was gone. I drove home, switched to running gear and set off. It was a nice, warm day, and it was good to be in the hilly forest behind our house, after a long time.

I decided to try out the Wahoo Tickr’s RunFit app, which promises to extract extra running metrics from the Wahoo Tickr X and I was curious to see how it works. Of course, I took the good old Garmin Forerunner 220 as a backup.

I had to make dinner for the family to come back from their race prep (it’s the International Youth Regatta in Brno this weekend), so I didn’t have too much time to run.

The RunFit app was interesting. After every kilometer, a computer lady voice told me “distance x kilometer heart rate 155 pace previous lap 5 minutes 7 seconds”. It annoyed me quite a lot, because the RunFit kilometers were about 100m shorter than the Garmin kilometers. I trust the Garmin more, because it is very consistent with the SpeedCoach, with CrewNerd (running on the same iPhone as the RunFit app) and with other apps. Interesting that an app running on the same hardware can disagree with another app. Funny algorithms. Not enough data smoothing. Something like that. It proves again that doing sports data science is not easy.

After the run, the app offered me the promised stats. Here they are (in screenshot form):

So apart from Cadence we have running smoothness, vertical oscillation and ground contact. So according to RunFit my ground contact was 173ms, and according to this link elite runners are under 200 ms. To be honest, I have no idea whether my running metrics are good or bad (and I honestly don’t care much as long as I don’t get injured while running), and to make matters worse, I don’t trust metrics measured by an app that doesn’t get distance right.

By the end of the run, the Garmin was 1km behind the RunFit app.

When I exported the run from RunFit to Strava, Runkeeper, and TrainingPeaks, I was curious to see if the extra metrics would make it across.

Strava? Nope

TrainingPeaks? The sync didn’t work, so I don’t know

Runkeeper? Nope

So all in all I am not so impressed. I am more impressed by the website VeloViewer, which integrates very nicely with Strava.

http://veloviewer.com/activities/982844482

You can make cool 3D pictures like this one:

3dprofile

 

There are also a few plots and additional statistics to explore, and everything looks very nice and slick.

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By sanderroosendaal • Uncategorized • 1 Comment • Tags: crosstraining, running

wash

May 11 2017

Thursday – Steady State

Every day is different this week. Today it was a nice 21 degrees and sunny. Krocan and I went out in singles and we did a long steady state row. It was choppy when we started and flat when we finished. In the chop, I rowed away from Krocan easily. On flat water, the difference was smaller. I worked on sending the boat at the finish, tapping down clean and keeping the wash metric low.

 

You can see how the total drive length has a much smaller spread than the effective length.

On rowsandall.com, the wash numbers always look a bit worse than what I expect from the numbers I see in the boat.

All this focus on “wash”. Does it really pay off? I decided to filter my rowsandall.com OTW rows on “Steady State” and look at the median value of Wash and its standard deviation. The result is sobering:

I added the average wind strength as reported by the Dark Sky network to the plot. It seems the wind (and probably chop) is the biggest factor influencing the Wash value and its spread.

 

By sanderroosendaal • Uncategorized • 2 Comments • Tags: OTW, rowing, single, steady state, training

typicalvalues2.jpg

May 11 2017

Two rest days and a hard session (lactate, lactate!)

Monday was a travel and tourism day, and tuesday was a very long day at work, and after the long weekend I was behind on a couple of important work related duties, as well as evening conference calls with final reviews of some project proposals, so I had to skip training. I didn’t mind much. I think a 2 day gap now and then, when life and work get in the way, is actually quite healthy and definitely not detrimental.

This also gave me a motivation to do a really hard training, although I chickened out of what our head coach had posted on the training plan board:

2x(7×50″/10″) @ 34-36 spm, 5 minutes rest between the 2 sets

That is like 30 strokes “on”, 3 strokes “rest”, for 7 minutes, at a stroke rate that I cannot hold for 4 minutes. Driving to the rowing club, I was thinking of what to do with these instructions. I was also curious to see how many of our Masters rowers would turn up on this Wednesday and what boat type I would row.

Turns out that through back injuries, work related duties, business travel, we had 4 rowers of our eight, plus 1 younger guy who rows with the Masters group occasionally. The issue, however, was that that one guy is not comfortable rowing a single, and one of the others is not a sculler. He only rows sweep. I got a little impatient when we hadn’t decided after 25 minutes so I announced that I would go in the single (which would also enable me to row my own session). The sweep rower Bulda teamed up with Krocan to take a pair, and the remaining two got out in a double.

We have the full Albano lanes out because of the International Youth Regatta of coming weekend, so I wanted to do 2x”something intensive at high stroke rates” in the 2k course. My training phase prescribes ANC training, which is short intervals with rest, and many of them, to get the body to produce lactate (as fuel, which I will condition the body to use in the subsequent phase).

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After 2k of warming up, I stopped to fiddle with my HR strap. I had the feeling that it was too lose and that I felt the strap on my back creeping down slowly. So I tried to adjust it back, which led to it snapping. The Wahoo Tickr straps connect with snap fasteners to the sensor “pod”. They call it the “two-snap” connection which is easy to get on and off. Well. It snapped. Under two layers of clothing (because it was cold), with me being in a single on cold water.

So I removed the upper part of my uni, clamped the scull handles between my belly and my legs, and tried to use two hands to snap on the HR strap. Initially, I failed, and I ended up holding only the sensor, with the strap being somewhere under my clothes, and discovering that my left blade had turned and was now perpendicular to the water, in flipping position. I corrected that, and proceeded to struggle. In the end I managed to snap everything back on and get my clothes in order as well. Without flipping.

Krocan proposed 20 strokes “on”, 10 strokes “off”, and that seemed a very good compromise. At this point, I was incorrectly remembering the training schedule and thinking that there were 3 series of 50″/10″, so I agreed with his proposal, thinking that we would 3 full 2k distances of them.

myimage (33)

myimage (34)

It was nice to row this next to the pair. I called out every eigth stroke of the paddle and grunted after the 20th (final) stroke of each interval. I managed to beat them by about a length over one entire 2k course. Looking at the graph, I see we did only 7 intervals per 2k. It felt more like 9 or 10. Anyway, after the first (headwind) and second (tailwind) 2k all three of us were so worn out that we couldn’t think of doing another series. So we just rowed the final 2k at steady state pace, followed by a cooling down.

During the intervals, I saw how I achieved fewer and fewer Watts as the intervals went on. Here, I am trying to see if that is a result of reduced force, length, stroke rate, or both. Stroke rate is excluded. You can already see from the overview chart above that the stroke rate didn’t drop. Here is a look at peak and average force.

 

In the these two plots, you can see that the effective drive length also drops, especially as I am shorter on the finish. I focused on not tapping down too late, because I noticed a very strong effect on “wash”, and also it makes it easier to keep the stroke rate high.

The next plot shows the same, but with effective drive length (taking into account slip and wash) instead of total drive length. I am running my effective drive length at 85% of total drive length. I would be interested to see the values of other people.

I also added a plot of the result, Work per Stroke, for the “on” intervals.

Here are some typical values according to Nielsen-Kellerman, compared to a summary for my “on” strokes. The values closest to my stroke are indicated with the colored cells. I guess I am just lacking in power and strength.

By sanderroosendaal • Uncategorized • 2 Comments • Tags: ANC, ANC training, intervals, lake, OTW, rowing, single

IMG_2231

May 8 2017

Stroke Analysis of my 1000m singles race

Race Analysis

In this post I am looking at a few detailed metrics of the Masters 1x 1000m race I rowed yesterday. Data were collected with a SpeedCoach GPS 2 combined with a NK Empower Oarlock.

Here is the overview plot of catch and finish angles for the entire outing, including warming up and cooling down. The actual race starts at 1200m. Interesting to see that I seem to suddenly take length about 400m before the finish line. This is exactly the point where I finally passed my opponent and actually started to row at a lower power.

bokeh plot (60)

Here is a close-up of catch and finish angle for the race segment. We’re talking a 1 degree difference, but still it looks pretty consistent and significant.

bokeh plot (61)

So here is the power and average drive force. The start strokes are always at high power and force, as you are starting from a stop and rowing short strokes at high rate. I think I did a pretty good job getting the average force down to an average value and holding that for the rest of the race. It is interesting to see the power drop about half way, while the drive force remains constant, and the catch angle actually increases. That means that I either started to row at a lower stroke rate, or the actual stroke was shorter despite the catch angle being longer.

bokeh plot (62)

The plot thickens when we look at the “Work per Stroke” which drops with the drop in power. So it looks like the stroke rate remained constant, but something else was changing.

bokeh plot (63)

Funny enough, both the absolute drive length and the effective drive length remain constant for the entire race and at pretty good values. So the shift in catch angle was actually me focusing on length (after I had passed my opponent) and tap-down (which makes the stroke slightly shorter at the finish). Should be visible from Wash values.

bokeh plot (64)

Looking at Wash and Slip values, I cannot see a big difference:

bokeh plot (66)

 

Finally, the solution to the riddle seems to be the Peak Drive Force:

bokeh plot (67)

 

Interesting! I hadn’t expected that. The stroke profile plot for the first half of the race:

bokeh plot (68)

And here is the second half of the race. Almost identical to the first half, but the tiny difference do lead to a drop in power, while my pace didn’t drop as much as that of my opponent.

bokeh plot (69)

Here are power and pace in one plot:

bokeh plot (70)

And finally, stroke rate and power:

Monday – Tourism and travel home

Today was a holiday, so we made a few stops on the way home. Here are a few pictures:

 
 
 
 
 
 
 
 
 
 

By sanderroosendaal • Uncategorized • 0 Comments • Tags: OTW, rowing, rowing analytics, single

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