scholarly journals Differences in the kinetics and kinematics of supported and un-supported landings of the rugby union lineout

2017 ◽  
Vol 13 (1) ◽  
pp. 1-6
Author(s):  
J. Sinclair ◽  
A. Smith ◽  
P.J. Taylor ◽  
S.J. Hobbs
Keyword(s):  
Body Weight ◽  
Motion Capture ◽  
Vertical Velocity ◽  
Loading Rate ◽  
Rugby Union ◽  
Force Platform ◽  
Camera Motion ◽  
Motion Capture System ◽  
Current Investigation

The aim of the current investigation was to comparatively examine the kinetics and kinematics of supported and un-supported landings during the rugby union lineout. Eleven male lineout jumpers were tested under two conditions, ‘supported’ in which the lifters maintained supportive contact with the jumper until the jumpers’ feet touched the floor and ‘un-supported’ in which the lifters released the jumper once they had caught the ball. Kinematics were examined using an eight camera motion capture system and kinetics using a force platform. Differences between conditions were examined using paired t-tests. The findings showed the instantaneous loading rate (supported = 212.9±102.5 body weight (BW)/s and un-supported = 449.0±142.4 BW/s) and vertical velocity (supported = 2.7±0.4 m/s and un-supported = 4.0±0.4 m/s) at foot contact were significantly larger in the un-supported condition. The findings from the current investigation indicate that if the lineout jumper is un-supported by the lifters in returning to the ground then their risk from injury is likely to be greater. Therefore, given the number of lineouts that are conducted per game it is recommended that this law be clarified to also specify supported lowering of the jumper at all levels of play.

Minimalist footwear does not affect tiobiofemoral stress loading during the stance phase in rearfoot strikers who use conventional footwear

2016 ◽  
Vol 12 (2) ◽  
pp. 99-103 ◽  
Author(s):  
J.K. Sinclair
Keyword(s):  
Motion Capture ◽  
Stance Phase ◽  
Lower Extremities ◽  
Peak Stress ◽  
Force Platform ◽  
Peak Force ◽  
Camera Motion ◽  
Motion Capture System ◽  
Tibiofemoral Joint ◽  
Force Peak

The aim of the current study was to comparatively examine the effects of minimalist and conventional footwear on the loads experienced by the tibiofemoral joint during running. Ten male participants ran at 4.0 m/s (±5%) over a force platform in minimalist and conventional footwear. Kinematics of the lower extremities were collected using an eight camera motion capture system. Peak tibiofemoral force, peak tibiofemoral stress and tibiofemoral force experienced per mile were extracted and compared between footwear using paired t-tests. The results showed that no differences (P>0.05) in peak force (conventional = 40.02±6.45 and minimalist = 38.68±7.79 N/kg), peak stress (conventional = 14.54±1.77 and minimalist = 13.98±2.52 MPa) or force experienced per mile (conventional = 3,358.35±584.83 and minimalist = 3,308.04±636.31 N/kg·mile) were evident between footwear. Therefore this indicates that minimalist footwear may not provide any further protection from running related tibiofemoral pathologies compared to conventional footwear.

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

2016 ◽  
Vol 32 (4) ◽  
pp. 359-364 ◽  
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.

Gender differences in the Achilles tendon load during the fencing lunge

2014 ◽  
Vol 6 (3) ◽  
Author(s):  
Jonathan Kenneth Sinclair ◽  
Lindsay Bottoms
Keyword(s):  
Gender Differences ◽  
Achilles Tendon ◽  
Motion Capture ◽  
Tendon Injury ◽  
Force Platform ◽  
Motion Capture System ◽  
3D Motion ◽  
Loading Rates ◽  
Tendon Pathology ◽  
3D Motion Capture

AbstractRecent epidemiological analyses in fencing have shown that injuries and pain linked specifically to fencing training/competition were evident in 92.8% of fencers. Specifically the prevalence of Achilles tendon pathology has increased substantially in recent years, and males have been identified as being at greater risk of Achilles tendon injury compared to their female counterparts. This study aimed to examine gender differences in Achilles tendon loading during the fencing lunge.Achilles tendon load was obtained from eight male and eight female club level epee fencers using a 3D motion capture system and force platform information as they completed simulated lunges. Independent t-tests were performed on the data to determine whether differences existed.The results show that males were associated with significantly greater Achilles tendon loading rates in comparison to females.This suggests that male fencers may be at greater risk from Achilles tendon pathology as a function of fencing training/ competition.

Quantifying the Accuracy of a Motion Detecting Neural Prosthesis

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.

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

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

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

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

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

2015 ◽  
Vol 47 (1) ◽  
pp. 41-49 ◽  
Author(s):  
Isaac Estevan ◽  
Coral Falco ◽  
Julia Freedman Silvernail ◽  
Daniel Jandacka
Keyword(s):  
Motion Capture ◽  
Lower Limb ◽  
Kinematic Analysis ◽  
Peak Velocity ◽  
Frontal Plane ◽  
Distal Segment ◽  
Proximal Segment ◽  
Camera Motion ◽  
Motion Capture System ◽  
Sequential Movement

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.

scholarly journals Analysis of Musculoskeletal Disorder Due To Working Postures via Dual Camera Motion Capture System

2018 ◽  
Vol 10 (5) ◽  
Author(s):  
Mohd Zamani Ngali ◽  
◽  
Noratika Budi Jemain ◽  
Chang An Wee ◽  
Mohd Nasrull Abdol Rahman ◽  
...  
Keyword(s):  
Motion Capture ◽  
Musculoskeletal Disorder ◽  
Camera Motion ◽  
Motion Capture System ◽  
Working Postures
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