The Effect of Boat Movements in Flat Water Sprint Canoeing

1) The Hydrodynamic Cost of Instability

In high-performance sprint canoeing and kayaking, the boat's interaction with the water surface is the primary factor limiting velocity. While the athlete’s power output drives the boat forward, roll (sides of the boat moving up and down) and pitch (tip of the boat moving up and down) act as parasitic movements that drain energy and increase drag. This effect is caused by an increase in wetted surface during roll, which leads to more total friction. When pitching, the effective waterline length is altered; when the boat dips (negative pitch), it pushes more water aside rather than slicing through it, increasing the pressure drag.

While exact numbers for canoeing are unavailable, a study on rowers found that due to boat movements, the average drag increases by 1.46% compared to a steady boat [1]. To emphasize the effect of such a gain: a 1% improvement in velocity results in approximately 1 second saved for K1 500m times. This can be the difference between second place and sixth place at an elite level, such as the 2026 ICF men's K1 500m finals in Szeged.

It is, therefore, not surprising that a doctoral thesis studying this topic found that more successful athletes have a much more stable boat. In [2], 135 athletes were classified into three categories: international (n=78), national (n=38), and club (n=19) level paddlers. The roll (denoted as rocking) and pitch (denoted as bouncing) were analysed, with the finding that elite athletes have a significantly more stable boat compared to national athletes.

We can thus conclude that having a stable boat in canoeing differentiates good athletes from the elite. The qualitative study cited here clearly demonstrates this correlation, albeit without specifying the exact deflections in degrees. However, in order to control training precisely, quantifiable statements are necessary, which are provided by the following table:

	Beginner	Advanced	Professional
Roll	20-8° Deflection	10-5° Deflection	6-0° Deflection
Pitch	1.0-0.6° Deflection	0.6-0.3° Deflection	0.3-0.0° Deflection

 

The quantitative values for roll shown here are drawn from the recommendations of the boat manufacturer Nelo for their boats. For the pitch movement, measurements were carried out on various athletes using the PaddlePulse sensor. In general, roll increases with increasing speed; however, pitch is usually most pronounced at intensive but sub-maximal speeds (stroke rate ~90).

2) How can we mitigate boat movements?

The first step is to measure boat movements, as it is difficult to identify improvements otherwise. This can be done visually using a camera or precisely measured using 6-axis measurement devices like the Janova PaddlePulse.

Once the current state is established, it is time to work on two key areas:

• Pitch is primarily induced by technique. If the blade presses the water downward during the catch, the tip of the boat lifts, leading to increased pitch. Conversely, if the exit of the blade at the end of the propulsion phase lifts a lot of water, the hull is pulled down, increasing pitch again. Therefore, the correct blade angle upon entry, combined with a clean sideways exit at the hips, is the key to reducing pitch.
• Roll can be caused by unequal leg pressure. Using the foot-rest to stabilize the pelvis ensures a more stable boat. However, this is only possible with stable core muscles. These muscles can be developed through on-water drills that emphasize a break between strokes or by balance exercises, such as sitting in the boat without a blade. Moreover, research has found that the utilization of unstable core training can also help. A study in China with 60 athletes found that training core muscles on a BOSU ball instead of the ground improved performance significantly more than stable core training.

In summary: Having a stable boat—meaning minimal roll and pitch—is highly important for elite athletes. We can measure these movements using camera or IMU systems and mitigate them by ensuring a clean catch and exit with the blade, as well as maintaining a symmetric leg drive and a stable core.

References:

[1] Kleshnev, V. (2016). Biomechanics of Rowing

[2] Brown, M. B. (2008). Biomechanical analysis of flatwater sprint kayaking

[3] Gao, X., et al. (2025). Effects of an 8-week unstable core training on trunk muscle strength and performance among kayakers