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Communication Dans Un Congrès Année : 2014

Validation of an inertial measurement unit for the determination of the longitudinal speed of a swimmer

Résumé

Introduction Swimming effectiveness is often assessed by intra-cyclic velocity variations (IVV). Recent 3D kinematics studies showed that those IVV could be higher in lateral axis rather than in longitudinal axis (Psycharakis et al., 2010) and linked to hand 3D kinematics (Figueiredo et al., 2012). In the same time, body roll is found to influence performance (Psycharakis & Sanders, 2010). However, the relationships between IVV in the 3D, hip oscillations (yaw, pitch and roll) and the hand 3D kinematics remain unclear and correspond to the aim of this study. Methods One international female swimmer swam an all-out 25 m in front crawl. She was equipped with 6 body landmarks (left wrist, elbow and shoulder, head, both left and right hips). Both underwater and aerial 3D kinematics have been assessed by multi-camera system (50 Hz, calibration frame with 103 calibration points, 3.67 x 1.63 x 1.42 m, DLT method) while hip 3D oscillations and IVV have been assessed by inertial measurement unit (CIREN). Correlations between hip yaw, pitch and roll and hip IVV in X, Y and Z and hand movements in 3D have to be assessed. Results 3D kinematics of the arm features 3 key phases of the underwater phase of the stroke cycle (see figure, that presents only translations along Y): A, where the left wrist is on the left of the vertical plane passing through the elbow, itself left of the vertical plane formed by a shoulder; B, where the wrist is between elbow and shoulder; C, where the wrist is on the right of both elbow and shoulder. The beginning of the A phase matches the transition between catch and pull. Both longitudinal and vertical displacements (along X and Z, respectively) of the hand and the hips and 3D rotations (attitudes) of the hips have also been assessed. Corresponding graphs shows also interesting features. Conclusions It was observed here that the lateral displacements (translations along the Y axis) of the hips (in green on figure) are limited and presumably hardly discernible on all signals from the 3D kinematic video analysis. The use of an inertial measurement unit (CIREN), that could measure linear accelerations and angular velocities (and assess attitudes: yaw, pitch and roll) should highlight cyclical phenomena and identify the probable correlations between kinematics of the hand and pelvis. References Figueiredo P, Kjendlie PL, Vilas-Boas JP, Fernandes RJ. (2012). Intracycle velocity variation of the body centre of mass in front crawl. Int J Sports Med. 33(4):285-90. Psycharakis SG, Naemi R, Connaboy C, McCabe C, Sanders RH. (2010). Three-dimensional analysis of intracycle velocity fluctuations in front crawl swimming. Scand J Med Sci Sports. 20:128-135. Psycharakis SG, Sanders RH. (2010). Body roll in swimming: a review. J Sports Sci. 28(3):229-36.
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hal-04437377 , version 1 (04-02-2024)

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Frédéric Puel, Ludovic Seifert, Philippe Hellard. Validation of an inertial measurement unit for the determination of the longitudinal speed of a swimmer. XIIth International Symposium on Biomechanics and Medicine in Swimming, Apr 2014, Canberra, Australia. ⟨hal-04437377⟩
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