Comparison of Lower Limb Segments Kinematics in a Taekwondo Kick. An Approach to the Proximal to Distal Motion

AbstractIn taekwondo, there is a lack of consensus about how the kick sequence occurs. The aim of this study was to analyse the peak velocity (resultant and value in each plane) of lower limb segments (thigh, shank and foot), and the time to reach this peak velocity in the kicking lower limb during the execution of the roundhouse kick technique. Ten experienced taekwondo athletes (five males and five females; mean age of 25.3 ±5.1 years; mean experience of 12.9 ±5.3 years) participated voluntarily in this study performing consecutive kicking trials to a target located at their sternum height. Measurements for the kinematic analysis were performed using two 3D force plates and an eight camera motion capture system. The results showed that the proximal segment reached a lower peak velocity (resultant and in each plane) than distal segments (except the peak velocity in the frontal plane where the thigh and shank presented similar values), with the distal segment taking the longest to reach this peak velocity (p < 0.01). Also, at the instant every segment reached the peak velocity, the velocity of the distal segment was higher than the proximal one (p < 0.01). It provides evidence about the sequential movement of the kicking lower limb segments. In conclusion, during the roundhouse kick in taekwondo inter-segment motion seems to be based on a proximo-distal pattern.

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The Influence of Minimalist and Maximalist Footwear on Patellofemoral Kinetics During Running

Journal of Applied Biomechanics ◽

10.1123/jab.2015-0249 ◽

2016 ◽

Vol 32 (4) ◽

pp. 359-364 ◽

Cited By ~ 27

Author(s):

Jonathan Sinclair ◽

Jim Richards ◽

James Selfe ◽

James Fau-Goodwin ◽

Hannah Shore

Keyword(s):

Motion Capture ◽

Lower Limb ◽

Patellofemoral Joint ◽

Musculoskeletal Modeling ◽

Camera Motion ◽

Motion Capture System ◽

Current Investigation ◽

Limb Kinematics ◽

Pain Symptoms ◽

Lower Limb Kinematics

The current study aimed to comparatively examine the effects of minimalist, maximalist, and conventional footwear on the loads experienced by the patellofemoral joint during running. Twenty male participants ran over a force platform at 4.0 m×s–1. Lower limb kinematics were collected using an 8-camera motion capture system allowing patellofemoral kinetics to be quantified using a musculoskeletal modeling approach. Differences in patellofemoral kinetic parameters were examined using one-way repeatedmeasures ANOVA. The results showed the peak patellofemoral force and pressure were significantly larger in conventional (4.70 ± 0.91 BW, 13.34 ± 2.43 MPa) and maximalist (4.74 ± 0.88 BW, 13.59 ± 2.63 MPa) compared with minimalist footwear (3.87 ± 1.00 BW, 11.59 ± 2.63 MPa). It was also revealed that patellofemoral force per mile was significantly larger in conventional (246.81 ± 53.21 BW) and maximalist (251.94 ± 59.17 BW) as compared with minimalist (227.77 ± 58.60 BW) footwear. As excessive loading of the patellofemoral joint has been associated with the etiology of patellofemoral pain symptoms, the current investigation indicates that minimalist footwear may be able reduce runners’ susceptibility to patellofemoral disorders.

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Pelvifemoral Kinematics while Ascending Single Steps of Different Heights

Journal of Applied Biomechanics ◽

10.1123/jab.26.3.290 ◽

2010 ◽

Vol 26 (3) ◽

pp. 290-294 ◽

Cited By ~ 3

Author(s):

Richard W. Bohannon ◽

Jason Smutnick

Keyword(s):

Motion Capture ◽

Lower Limb ◽

Sagittal Plane ◽

Frontal Plane ◽

Step Height ◽

Motion Capture System ◽

Pelvic Rotation ◽

Hip Flexion

Motion of the femur and pelvis during hip flexion has been examined previously, but principally in the sagittal plane and during nonfunctional activities. In this study we examined femoral elevation in the sagittal plane and pelvic rotation in the sagittal and frontal planes while subjects flexed their hips to ascend single steps. Fourteen subjects ascended single steps of 4 different heights leading with each lower limb. Motion of the lead femur and pelvis during the flexion phase of step ascent was tracked using an infrared motion capture system. Depending on step height and lead limb, step ascent involved elevation of the femur (mean 47.2° to 89.6°) and rotation of the pelvis in both the sagittal plane (tilting: mean 2.6° to 9.7°) and frontal plane (listing: mean 4.2° to 11.9°). Along with maximum femoral elevation, maximum pelvic rotation increased significantly (p< .001) with step height. Femoral elevation and pelvic rotation during the flexion phase of step ascent were synergistic (r= .852–.999). Practitioners should consider pelvic rotation in addition to femoral motion when observing individuals’ ascent of steps.

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Quantifying the Accuracy of a Motion Detecting Neural Prosthesis

Volume 5: Biomedical and Biotechnology ◽

10.1115/imece2020-23219 ◽

2020 ◽

Author(s):

Martin L. Tanaka ◽

Premkumar Subbukutti ◽

David Hudson ◽

Kimberly Hudson ◽

Pablo Valenzuela ◽

...

Keyword(s):

Motion Capture ◽

Gait Cycle ◽

Neural Prosthesis ◽

Average Error ◽

Camera Motion ◽

Motion Capture System ◽

General Shape ◽

Neural Connections ◽

Measurement Units ◽

The Brain

Abstract The neural prosthesis under development is designed to improve gait in people with muscle weakness. The strategy is to augment impaired or damaged neural connections between the brain and the muscles that control walking. This third-generation neural prosthesis contains triaxial inertial measurement units (IMUs - accelerometers, gyroscopes, and processing chip) to measure body segment position and force sensitive resistors placed under the feet to detect ground contact. A study was conducted to compare the accuracy of the neural prosthesis using a traditional camera motion capture system as a reference. The IMUs were found to accurately represent the amplitude of the gait cycle components and generally track the motion. However, there are some differences in phase, with the IMUs lagging the actual motion. Phase lagged by about 10 degrees in the ankle and by about 5 degrees in the knee. Error of the neural prosthesis varied over the gait cycle. The average error for the ankle, knee and hip were 6°, 8°, and 9°, respectively. Testing showed that the neural prosthesis was able to capture the general shape of the joint angle curves when compared to a commercial camera motion capture system. In the future, measures will be taken to reduce lag in the gyroscope and reduce jitter in the accelerometer so that data from both sensors can be combination to obtain more accurate readings.

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Biomechanics Analysis of Sepak Takraw Tekong Serves via Depth Camera Motion Capture System

Proceedings of the 3rd International Colloquium on Sports Science, Exercise, Engineering and Technology ◽

10.1007/978-981-10-6772-3_15 ◽

2018 ◽

pp. 119-128

Author(s):

Muhammad Zulhilmi Kaharuddin ◽

Siti Badriah Khairu Razak ◽

Mohamed Shawal Abd Rahman ◽

Wee Chang An ◽

Muhammad Ikram Kushairi ◽

...

Keyword(s):

Motion Capture ◽

Depth Camera ◽

Camera Motion ◽

Motion Capture System

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SnakeStrike: A Low-Cost Open-Source High-Speed Multi-Camera Motion Capture System

Frontiers in Behavioral Neuroscience ◽

10.3389/fnbeh.2020.00116 ◽

2020 ◽

Vol 14 ◽

Author(s):

Grady W. Jensen ◽

Patrick van der Smagt ◽

Egon Heiss ◽

Hans Straka ◽

Tobias Kohl

Keyword(s):

Open Source ◽

Motion Capture ◽

High Speed ◽

Low Cost ◽

Camera Motion ◽

Motion Capture System

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Dual Kinect v2 system can capture lower limb kinematics reasonably well in a clinical setting: concurrent validity of a dual camera markerless motion capture system in professional football players

BMJ Open Sport & Exercise Medicine ◽

10.1136/bmjsem-2018-000441 ◽

2018 ◽

Vol 4 (1) ◽

pp. e000441 ◽

Cited By ~ 2

Author(s):

Argyro Kotsifaki ◽

Rodney Whiteley ◽

Clint Hansen

Keyword(s):

Motion Capture ◽

Excellent Agreement ◽

Lower Limb ◽

Motion Capture System ◽

Kinect V2 ◽

Markerless Motion Capture ◽

Flexion Extension ◽

Limb Kinematics ◽

Kinematic Evaluation ◽

Lower Limb Kinematics

ObjectivesTo determine whether a dual-camera markerless motion capture system can be used for lower limb kinematic evaluation in athletes in a preseason screening setting.DesignDescriptive laboratory study.SettingLaboratory setting.ParticipantsThirty-four (n=34) healthy athletes.Main outcome measuresThree dimensional lower limb kinematics during three functional tests: Single Leg Squat (SLS), Single Leg Jump, Modified Counter-movement Jump. The tests were simultaneously recorded using both a marker-based motion capture system and two Kinect v2 cameras using iPi Mocap Studio software.ResultsExcellent agreement between systems for the flexion/extension range of motion of the shin during all tests and for the thigh abduction/adduction during SLS were seen. For peak angles, results showed excellent agreement for knee flexion. Poor correlation was seen for the rotation movements.ConclusionsThis study supports the use of dual Kinect v2 configuration with the iPi software as a valid tool for assessment of sagittal and frontal plane hip and knee kinematic parameters but not axial rotation in athletes.

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