Athlete monitoring and performance investigations are crucial for athletes and coaches as part of training progress and injury recovery. Athlete training is not always conducted at special training facilities even at some points without a coach being able to take part at every training session. Small IMUs are offering a great benefit as they allow recording nearly every conducted training session. The research presented here used a self-developed IMU in comparison with a tethered velocity meter to investigate the arm symmetry in freestyle swimming. The recorded data were firstly calibrated before it was high-pass filtered to remove gravity from the signal. A zero-crossing detection algorithm was applied to allow the separation into left- and right-arm strokes to find variations in distances. The results showed a very strong agreement between the IMU and the velocity meter of r2 > 0.99 for each individual athlete with a mean agreement over all participants of r2 = 0.9994.
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