The aim of this study was to propose a method using inertial measurement units (I MU) for capturing elbow and knee angles in breaststroke in order to assess arm-leg coordination. Four IMUs were located on the forearm and the arm to assess elbow angle, and on the thigh and the leg to assess knee angle The main challenge was the angle normalisation in order to correct the drift due to gyroscope measurement. To correct that drift, we proposed to compute wrapping lines around the angle signal, and to normalise the signal with the support of these reference lines. Even if the proposed method did not allow the definition of real joint positions, measurements allowed the definition of patterns of joint angles and the calculation of inter-limb coordination.
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