• Rowing Technique App

    Quiske Rowing Performance System

    Improve your Rowing Technique

  • Measure and Improve your Rowing Technique on water

    How to use the Rowing Performance System on Water and what you get out of it.

     

    The Quiske Rowing Performance System consists of the Rowing Performance App and a sensor that together can measure, analyze and provide real time feedback on your rowing technique, so that you can become a better rower. Our SW automatically sniffs for rowing strokes and produces real time feedback on both boat specific metrics (boat acceleration and velocity) as well as rower specific metrics (oar and seat work of individual rowers).

     

     

    The Rowing Performance App uses kinetics sensors not only from one external Quiske sensor but also from the phone (which needs to be rigidly attached to the boat). The data from both sources are combined and synchronized and run through our algorithm engine to produce simple feedback to help you improve as a rower with feedback provided after each stroke, right there while still on water.

    The Quiske Rowing Performance System consists of sensors and a phone App

    How to get started?

    You need a preferably water proof Android phone with our Rowing Performance App installed (you do also need to create a free account before first time use) and you need to rigidly attach it on the boat, somewhere close to the foot stretcher where you can see the real time feedback our App provides. You can use double sided tape or any rigid phone holder.

    Next pull on our sensor strap onto your oar, and place the sensor firmly next to the oarlock with the sensor handle pointing towards the rower on the side of the oar where the blade is convex (see our Guide for more details).

     

    If you want to measure both oars you need two sensors and two phones (one phone per sensor). Also you can measure the speed of your seat, in that case you need to place the sensor under the seat with the handle facing towards the stern of the boat.

     

    When you launch the Rowing Performance App you need to choose the right boat type under Settings. Here you can also choose between different units, and whether recording should start straight after pressing “Record” or only after rowing actually starts, and whether to pause recording when rowing is paused. We recommend “AutoConnect” as the preferred method to speed up the set up when going on water, this option simply connects automatically to the sensor used previously.

    When you’re happy with your Settings you continue to the Rowing screen where you first connect to the Quiske sensor and drag it to the right position on the screen (left/right oar, or the seat) . After that all you need to do is start rowing.

    You can place the Quiske Sensor on the oar or on the seat

    What does the App measure and show in real time?

     

     

    You can swipe between a number of other screens showing either real time metrics or graphs of how the boat or the oar or the seat of the rower is performing.

    Main Rowing Screen

    This is the default screen showing four tiles with traditional metrics such as SPM, speed and distance but most interesting from rowing performance point of view are the metrics from the oar or seat sensor: You can see the arc length of your oar work in real time, or, the maximum seat speed during the drive. Each tile can be flipped to show one of two metrics.

     

     

     

     

    Boat acceleration curve

    The first graph shows the acceleration of the boat during the previous stroke. When rowing, the boat velocity fluctuates in rhythm with the strokes. The oars propel the boat forward during the drive and this accelerates the boat. The movement of the rowers back and forth relative to the boat accelerates and decelerates the boat and our App gives real time feedback on when and by how much the boat is speeding up or slowing down during the previous stroke.The shape of the curve as well as the max and min values depend very much on the rowing technique and real time feedback on boat acceleration gives information on how efficiently a rower is moving the boat. The y-axis shows the acceleration in m/s^2 whereas the x-axis shows the normalized time without units, the x-axis is auto-scaled to fit one entire stroke cycle from catch to finish no matter what the stroke rate is. If the y-value is positive it means that the boat is speeding up, and you can easily see during which part of the stroke this happens by having a look at what part of the curve is above the x-axis.

    Boat speed curve

    The next screen when swiping left is the boat speed curve, showing how the boat speed various during one full stroke. Here the shape is what counts and we do not show any units on the axes while rowing. The boat speed curve can be studied in more detail in our web portal (see below).

     

    If you have a sensor connected to an oar the following screens show feedback on how you are moving the oar. The first graph shows the path of the blade during one full stroke. Our oar sensor measures the rotation in all three directions and from this we are able to calculate the full path of the oar both horizontally and vertically.

     

     

     

     

    Blade flight path

    This graph visualizes how the oar is moving up and down as well as back and forth. The shape of the blade flight path reveals how the rower is handling the oar at catch, during the drive, at finish as well as during the recovery and a coach may be able to get a lot of insights about the rower’s technique from this. On both axes’ we have degrees. All values are relative, not absolute. In fact each curve starts from 0/0, continues counter clock wise, and returns to starting point. The vertical axis represents how high or low (from 0/0 starting point) the blade goes and horizontal axis tells how far the blade goes in front/back-directions.

    The Performance curve

     

    The performance curve shows the angular velocity of the oar in the horizontal direction. The values and especially the shape of the performance curve reveal a lot about the rowing technique. The higher the angular velocity of the oar is when the oar is in the water the higher the force that is applied to the boat is, in other words the performance curve is related to the power curve but is different in that it is useful also for analyzing not only the drive phase but also the recovery.
    If the performance curve has very steep sides when it crosses the x-axis it means that the rower is changing the direction of the motion very fast. Also you can see how even the distribution of power is during the drive and whether recovery is smooth or whether there is speeding up towards the catch. The location of the maximum angular velocity during drive and recovery can be analyzed in detail in the web portal (read more below), this is especially helpful for crews who want to row in synchrony.

     

    If you have a sensor connected to the seat the Rowing Performance App doesn’t show any oar graphs (the blade flight path and performance graphs above) but shows the velocity of the speed during one full stroke instead:

    Seat speed curve

    The seat speed is positive during drive and negative during recovery, of course the speed is 0 when the seat is stationary. You can see the maximum seat speed during drive as a numerical metrics on the right.

     

    You need to press record to store data from your rowing for uploading to our web portal for more detailed analysis. Stop recording when you’re finished with your piece. Short recordings are enough to see the signature rowing style of a rower and we recommend recording no longer than 10 minutes in each session. When you’re finished with your rowing you can go to Sessions to upload all sessions you want to store. The sessions remain locally on your phone until they are uploaded or until you delete them. Remember to finally close the App in order to disconnect from the sensor. Remember to charge you sensor once in a while.

    All recorded data can be uploaded to the Rowing Performance web portal which can be accessed with your Rowing Performance account login. Sessions are uploaded from the Rowing Performance App in the Sessions tab.

    What can you do with the data afterwards?

    The Rowing Performance web portal is where all your data is stored and analyzed. You can do detailed analysis of regions within any uploaded sessions and also compare them with each other.

    In the web portal the sessions are listed according to the time of recording and you can see the boat type, distance, speed, duration as well as where the Quiske sensor was located during the measurement.

    The Rowing Performance Web portal contains all recorded sessions that have been uploaded

    Clicking on a session allows first shows a summary of the session including the stroke rate and boat speed over the entire session.

    The individual points on the SPM and boat speed graph show the individual strokes measured and you can choose as many of these as you want for closer analytics on not only boat (acceleration and speed as a function of the stroke) but also rower specific measurements (blade flight path and seat velocity). As an example below is the blade flight path measured over 3 strokes:

     

    We also calculate a number of metrics from within the selected region, for example the average arc length of the stroke, the average angular velocity of the oar during drive and recovery (as well as where these maxima occur within the stroke cycle) and whenever there sensor is attached to the seat we provide the average top speed of the seat.
    Of course we also provide tagging and a map of where the session took place to help you remember what you were doing during a particular session.

    Why?

     

    We believe anyone can learn to row and when developing rowing performance, repetition is key. For fine tuning the motion feedback is necessary and immediate real time feedback is best. With our Rowing Performance App you get easy to understand metrics on boat, oar and seat performance and can focus on these one by one while still on water. With the real time oar arc angle the rower can make sure to keep long powerful strokes even during a longer race. The quality of the catch can be studied with the performance or blade flight path graphs. The quality of the leg work is visible in the seat speed graph, where also rushing on recovery is visualized.

     

    Our web portal stores all recorded uploaded sessions and allows detailed analysis and comparisons afterwards. By studying the shape of the graphs rowers in a crew can find differences in technique.

     

    You can also save analyses of certain regions within a session and compare those with others. Log in to our web portal for more information on the analytics provided.

     

    Rowing with the same technique is most efficient and makes the boat move faster.

  • Measure and Improve your Rowing Performance Indoors!

    How to use the Rowing Performance System on the Ergo and what you get out of it.

    Indoor Rowing technique is measured by placing the sensor on the seat and the phone one the handle. Our Rowing Performance App shows the speed graphs of the seat and the handle overlaid and in addition to that, eight metrics as numbers that can be seen also in real time:

    1. Stroke length (m)
    2. SPM
    3. The rhythm showing the duration of the drive (%)
    4. The maximum handle speed during the drive (m/s)
    5. The rhythm of the seat (%)
    6. The maximum seat speed during the drive (m/s) 
    7. The timing of seat vs handle (%)
    8. The time that the seat remains stationary during one stroke (%) 

    The graphs and metrics help you fine tune your rowing technique so that you can get rid of rushing on recovery, bum-shooting, and other typical beginners' mistakes, and always make the next stroke better than the previous one. Additionally our system is ideal for people in a crew, who want to synchronize their rowing technique in order to row their boat on water in the most efficient manner.

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