Abstract

The purpose of this study was to elucidate pelvic orientation angles using a single lower back-mounted inertial sensor during sprinting. A single inertial sensor was attached to each sprinter’s lower back, used to measure continuous pelvic movements including pelvic obliquity (roll), anterior-posterior tilt (pitch) and rotation (yaw) during sprinting from a straight to bend section. The pelvic orientation angles were estimated with the three-dimensional sensor orientation using a sensor fusion algorithm. Absolute angles derived from the sensor were compared with angles obtained from an optical motion capture system over a 15 m length. The root mean squared error between the sensor and motion capture data were 4.1° for roll, 2.8° for pitch and 3.6° for yaw. Therefore, the sensor was comparable to the motion capture system for tracking pelvic angle changes. The inertial sensor is now supported as a valid tool to measure movements of the pelvis during sprinting.

Highlights

  • Thoracic and pelvic tilt changes step to step during maximal accelerated sprinting [1]

  • The notable finding of the presented method is that a single IMU may be used to estimate detailed pelvic movement which was previously measured with a four maker mocap setup during sprinting

  • It was confirmed that a single inertial sensor is supported as a valid tool to measure movements of the pelvis during sprinting

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Summary

Introduction

Thoracic and pelvic tilt changes step to step during maximal accelerated sprinting [1]. The pelvic orientation during sprinting influences the power generation applied onto the ground [2], and is important to consider for coaches. Mocap is expensive, has high expertise requirements, is usually limited to laboratory environments and typically has only been used to measure sprinting over a short distance [2,3,4,5]. Sprinters run on both straight and curved tracks, except short distance events such as the 100 m. Previous studies showed differences in sprinter’s kinematics between straight and curved sprinting [6,7], but it was difficult for mocap to measure continuous changes in kinematics over the entire race

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