Pose tracking with rate gyroscopes in alpine skiing

Yoshioka, Shinsuke; Fujita, Zenya; Hay, Dean C.; Ishige, Yu

doi:10.1007/s12283-017-0261-y

Cited by 13 publications

(8 citation statements)

References 21 publications

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“…A sharp reduction of time drift could be observed when the IMU zeroing procedure was carried out, with a reduction factor between 0.02 (yaw) and 0.19 (roll). Assuming an absolute angular drift of 2° as a tolerable limit, according to a previous work [ 20 ], our IMU-based system could provide a strong correlation during 11 min in the worst case (roll). Consequently, the IMU zeroing procedure was thereafter always applied in the rest of the performed test.…”

Section: Resultsmentioning

confidence: 99%

Development and Evaluation of a Low-Drift Inertial Sensor-Based System for Analysis of Alpine Skiing Performance

Ruiz-García

Navarro-Marchal

Ocaña-Wilhelmi

et al. 2021

Sensors

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In skiing it is important to know how the skier accelerates and inclines the skis during the turn to avoid injuries and improve technique. The purpose of this pilot study with three participants was to develop and evaluate a compact, wireless, and low-cost system for detecting the inclination and acceleration of skis in the field based on inertial measurement units (IMU). To that end, a commercial IMU board was placed on each ski behind the skier boot. With the use of an attitude and heading reference system algorithm included in the sensor board, the orientation and attitude data of the skis were obtained (roll, pitch, and yaw) by IMU sensor data fusion. Results demonstrate that the proposed IMU-based system can provide reliable low-drifted data up to 11 min of continuous usage in the worst case. Inertial angle data from the IMU-based system were compared with the data collected by a video-based 3D-kinematic reference system to evaluate its operation in terms of data correlation and system performance. Correlation coefficients between 0.889 (roll) and 0.991 (yaw) were obtained. Mean biases from −1.13° (roll) to 0.44° (yaw) and 95% limits of agreements from 2.87° (yaw) to 6.27° (roll) were calculated for the 1-min trials. Although low mean biases were achieved, some limitations arose in the system precision for pitch and roll estimations that could be due to the low sampling rate allowed by the sensor data fusion algorithm and the initial zeroing of the gyroscope.

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Section: Resultsmentioning

confidence: 99%

Development and Evaluation of a Low-Drift Inertial Sensor-Based System for Analysis of Alpine Skiing Performance

Ruiz-García

Navarro-Marchal

Ocaña-Wilhelmi

et al. 2021

Sensors

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“…In the skiing competition, body posture has a direct impact on competition results. Through the repeated the experimental results in training practice, it is proved that the distortion of posture is induced by the compound participation of posture reflex (Yoshioka et al 2018, Alhammoud 2020. For example, an adult athlete who wants to improve his sports performance will raise his hand unconsciously, close his eyes, and cause the excitement of anterior tibial muscle related to joint movement.…”

Section: Introductionmentioning

confidence: 94%

Intelligent Skiing Posture Detection and Recognition Through Internet of Bodies

Liu

2022

International Journal of Mobile Computing and Multimedia Communications

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The training of special ability of skiing should start from the control of body posture ability to highlight the characteristics of the sports. Thus, the athletes can have the sports ability in the process of high-speed skiing. This paper establishes a system to automatically recognize the skiing posture which can help athletes grasp the skiing postures. First, the skiing images are collected by distributed camera. Second, the skeleton features are extracted to learn a classification model which is used to recognize and adjust skiing postures. Lastly, the analytical results of posture recognition is returned to athletes through Internet of bodies. The framework can effectively recognize the skiing postures and provide athletes with training advices.

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“…These IMUs were affixed along the segment coordinate systems defined according to Wu et al (2002). The IMU used in the current study was custom-made (Yoshioka et al, 2018). It comprised gyroscopes and an accelerometer.…”

Section: On-slope Field Measurementsmentioning

confidence: 99%

“…The orientation of an IMU during skiing was obtained by integrating the angular velocities measured by the gyroscopes. Then, the orientation of the segment to which an IMU was affixed, was calculated using the orientation of the IMU and the relative orientation between the segment and the IMU (Yoshioka et al, 2018).…”

Section: On-slope Field Measurementsmentioning

confidence: 99%

Muscle Activity and Morphology in Slalom Skiing by a Single-Leg Amputee Ski Racer: A Case Study of a Paralympic Athlete

Ishige¹,

Yoshioka²,

Hakamada³

et al. 2021

jsportscimed

Self Cite

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The aim of this study was to clarify the characteristics of skiing by a single-leg amputee ski racer from the viewpoints of muscle activity, morphology, and the relationship between both elements through comparisons with those of a non-disabled ski racer. One elite athlete, classified as LW2 (left thigh amputation), and one non-disabled athlete, as a control, participated in this study. The cross-sectional area of thigh muscles was measured through magnetic resonance imaging. Additionally, muscle activities and joint and segment kinematics during slalom skiing were measured using electromyography and inertial measurement units, respectively. The muscle activities and joint kinematics of the amputee racer in the turn in which he performed with the inside edge of the ski were similar to those of the outside leg of the non-disabled racer over a turn. In contrast, at the turn in which the amputee racer performed with the outside edge (more difficult side), the amputee racer largely activated the biceps femoris (BF) in the first half of the turn compared to the non-disabled racer. The reason could be to control the angular momentum of the trunk during the forward tilting motion. This is because a greater activity of the BF was observed during the period in which the forward tilt of the trunk was increased, and the mean activity of the BF was the greatest during the first half of the right turn in which the range of the motion of the forward tilt was the greatest. In terms of muscle morphology of the amputee racer, a significant hypertrophy of the BF and vastus lateralis was observed compared to the non-disabled racers. The well-developed BF was considered to be related to the large activity during the turn performed with the outside edge of the ski.

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Pose tracking with rate gyroscopes in alpine skiing

Cited by 13 publications

References 21 publications

Development and Evaluation of a Low-Drift Inertial Sensor-Based System for Analysis of Alpine Skiing Performance

Development and Evaluation of a Low-Drift Inertial Sensor-Based System for Analysis of Alpine Skiing Performance

Intelligent Skiing Posture Detection and Recognition Through Internet of Bodies

Muscle Activity and Morphology in Slalom Skiing by a Single-Leg Amputee Ski Racer: A Case Study of a Paralympic Athlete

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