scholarly journals The Influence of Ski Waist-Width and Fatigue on Knee-Joint Stability and Skier’s Balance

2020 ◽  
Vol 10 (21) ◽  
pp. 7766
Author(s):  
Martin Zorko ◽  
Karmen Hirsch ◽  
Nejc Šarabon ◽  
Matej Supej
Keyword(s):  
Knee Joint ◽  
Force Plate ◽  
The State ◽  
Alpine Skiing ◽  
Joint Stability ◽  
Risk Of Injury ◽  
Knee Joint Kinematics ◽  
Limb Kinematics ◽  
High Level ◽  
Lower Limb Kinematics

Alpine skiing is a complex sport that demands a high level of motor control and balance. In general, skiers are prone to deterioration in the state of fatigue due to using inappropriate equipment. As a consequence, the risk of injury might increase. This study aimed to examine the influence of fatigue and ski waist-width on knee-joint stability and skier’s balance. A laboratory skiing simulation in a quasistatic ski-turning position was conducted where the lower-limb kinematics was recorded using an optical system, and the balance-determining parameters were captured using a force plate. It was demonstrated that the knee-joint kinematics and skier’s balance were hampered in the state of fatigue, as well as when using skis with a large waist-width. The results of the study suggest avoiding the fatigue state and the use of skis having a large waist-width while skiing on hard surfaces to decrease the risk of injury.

scholarly journals Lower Limb Kinematics and Dynamic Postural Stability in Anterior Cruciate Ligament-Reconstructed Female Athletes

2013 ◽  
Vol 48 (2) ◽  
pp. 172-185 ◽  
Author(s):  
Eamonn Delahunt ◽  
Mark Chawke ◽  
Judy Kelleher ◽  
Katie Murphy ◽  
Anna Prendiville ◽  
...  
Keyword(s):  
Knee Joint ◽  
Acl Reconstruction ◽  
Postural Stability ◽  
Female Athletes ◽  
Cruciate Ligament ◽  
Knee Joint Kinematics ◽  
Limb Kinematics ◽  
Anterior Cruciate ◽  
Dynamic Postural Stability ◽  
Lower Limb Kinematics

Context: Deficits in lower limb kinematics and postural stability are predisposing factors to the development of knee ligamentous injury. The extent to which these deficits are present after anterior cruciate ligament (ACL) reconstruction is still largely unknown. The primary hypothesis of the present study was that female athletes who have undergone ACL reconstruction and who have returned to sport participation would exhibit deficits in dynamic postural stability as well as deficiencies in hip- and knee-joint kinematics when compared with an age-, activity-, and sex-matched uninjured control group. Objective: To investigate dynamic postural stability as quantified by the Star Excursion Balance Test (SEBT) and simultaneous hip- and knee-joint kinematic profiles in female athletes who have undergone ACL reconstruction. Design: Descriptive laboratory study. Setting: University motion-analysis laboratory. Patients or Other Participants: Fourteen female athletes who had previously undergone ACL reconstruction (ACL-R) and 17 age- and sex-matched uninjured controls. Intervention(s): Each participant performed 3 trials of the anterior, posterior-medial, and posterior-lateral directional components of the SEBT. Main Outcome Measure(s): Reach distances for each directional component were quantified and expressed as a percentage of leg length. Simultaneous hip- and knee-joint kinematic profiles were recorded using a motion-analysis system. Results: The ACL-R group had decreased reach distances on the posterior-medial (P < .01) and posterior-lateral (P < .01) directional components of the SEBT. During performance of the directional components of the SEBT, ACL-R participants demonstrated altered hip-joint frontal-, sagittal-, and transverse-plane kinematic profiles (P < .05), as well as altered knee-joint sagittal-plane kinematic profiles (P < .05). Conclusions: Deficits in dynamic postural stability and concomitant altered hip- and knee-joint kinematics are present after ACL reconstruction and return to competitive activity. The extent to which these deficits influence potential future injury is worthy of investigation.

scholarly journals Kinematic differences between professionals and young players in the tennis serve

2021 ◽  
Vol 29 (83) ◽  
pp. 25-27
Author(s):  
Christos Mourtzios ◽  
Ioannis Athanailidis ◽  
Eleftherios Kellis ◽  
Vasileia Arvanitidou
Keyword(s):  
Lower Limb ◽  
Lower Limbs ◽  
Young Athletes ◽  
Significant Difference ◽  
Tennis Serve ◽  
Limb Kinematics ◽  
High Level ◽  
Lower Limb Kinematics

The aim of the present study was to measure and examine the differences in lower limb kinematics between the flat, slice and topspin serves, in the kinematic features of the lower limbs, at two different times of the service movement, maximum knee bending and point of contact of the racket with the ball, in 12 young tennis athletes, aged 12-16 years and in 12 professional players that they were playing on the main draw of Roland Garros. The results showed no significant differences in time between the three types of service in young athletes. Comparing the time of young athletes 34.56ms with the time of high level athletes with 30.67ms, the results showed that the professionals performed the service faster than the young athletes having a significant difference.

scholarly journals Biomechanical Effects of Flamenco Footwork

2021 ◽  
Vol 80 (1) ◽  
pp. 19-27
Author(s):  
Alfonso Vargas-Macías ◽  
Irene Baena-Chicón ◽  
Joanna Gorwa ◽  
Robert A. Michnik ◽  
Katarzyna Nowakowska-Lipiec ◽  
...  
Keyword(s):  
Knee Joint ◽  
Ground Reaction Force ◽  
Angular Displacement ◽  
Reaction Force ◽  
Force Plate ◽  
Vertical Component ◽  
Camera Motion ◽  
Vertical Ground Reaction Force ◽  
Knee Joint Kinematics ◽  
Basic Features

Abstract Footwork is one of the basic features of flamenco dancing and is performed in traditional high-heeled shoes. The purpose of this study was to analyse the mechanical profile of flamenco dancing in terms of vertical ground reaction force, and knee joint kinematics of the supporting limb in footwork technique in order to understand causes which predispose injuries derived from the practice of flamenco dancing. The participant in our study was a professional female flamenco dancer (34 years, 58 kg, 1.65 m) who performed the ZAP 3 test, a sequence of single strikes of the feet performed continuously for 15 s. 3D lower extremity kinematic data were collected using a five-camera motion analysis system (Vicon; Oxford Metrics Ltd., Oxford, UK). Ground reaction forces were recorded using a Kistler force plate. Our analysis was based on 30 cycles of each lower limb consisting of 177 footwork steps. The vertical component of the ground reaction force did not reveal any significant differences between the left and the right limb. The most dynamic strike was provided by the heel (twice the participant's body weight). The mean angular displacement of the supporting limb’s knee was ~27°. Results reveal that these impacts could make the knee joint more prone to injuries.

scholarly journals Development of force plate for prosthetic applications interfacing with internet of things

2018 ◽  
Vol 7 (2.7) ◽  
pp. 944
Author(s):  
Y Bharat Satya Kumar ◽  
Y Kalyan Chakravarthy ◽  
Ratna Prasad Paladagu ◽  
R Venkatesh ◽  
A Srinath
Keyword(s):  
Ground Reaction Force ◽  
Load Capacity ◽  
Reaction Force ◽  
Force Plate ◽  
Maximum Load ◽  
Force Transducer ◽  
Electrical Signal ◽  
Limb Kinematics ◽  
Cell Force ◽  
Lower Limb Kinematics

Force Plate is a measuring instrument which is used to calibrate the ground reaction force in gait cycle analysis of a subject (human or animal). Force plates are used to examine the lower limb kinematics for the applications of prosthetics, sports etc. In this study, a prototype of force plate is developed indigenously in an economical manner. It comprises of two metallic frames with a load cell (force transducer) mounted between them to produce an electrical signal as output, that is proportional to the amount of force applied on the surface of force plate. This prototype has a maximum load capacity of 3000N. The design of the force plate system along with the ground reaction force analysis and results are discussed below.  

scholarly journals Lower limb kinematics and hip extensors strengths are associated with performance of runners at high risk of injury during the modified Star Excursion Balance Test

2020 ◽  
Vol 24 (6) ◽  
pp. 488-495 ◽  
Author(s):  
Larissa Santos Pinto Pinheiro ◽  
Juliana de Melo Ocarino ◽  
Natália Franco Netto Bittencourt ◽  
Thales Rezende Souza ◽  
Suelen Cristina de Souza Martins ◽  
...  
Keyword(s):  
High Risk ◽  
Lower Limb ◽  
Balance Test ◽  
Risk Of Injury ◽  
Limb Kinematics ◽  
Star Excursion Balance Test ◽  
Lower Limb Kinematics

Multidimensional analysis of the state of Russian studies on the education issues over 1993–2016

2018 ◽  
pp. 50-62
Author(s):  
Дмитрий Рубвальтер ◽  
Dmitry Rubvalter ◽  
Александр Либкинд ◽  
Alexander Libkind ◽  
Валентина Маркусова ◽  
...  
Keyword(s):  
Web Of Science ◽  
The State ◽  
Multidimensional Analysis ◽  
Russian Regions ◽  
Global Flow ◽  
Educational Issues ◽  
Foreign Countries ◽  
High Level ◽  
The Web ◽  
Made In

A multidimensional analysis of the state of Russian studies on the education issues over 1993–2016 was carried out based on the materials of the data contained in the Web of Science (SSCI, A & HCI and SCI-E databases). There were determined the dynamics and trends of a number of relevant indicators, such as the number of Russian publications by year, the share of these publications in the global flow of publications on education issues, the dynamics of the share of publications made in co-authorship with foreign colleagues, etc. A number of distributions of Russian publications on educational issues was compiled and analyzed: by journals, by Russian regions and cities, by organizations and authors of the publications. It was found that most of these distributions were characterized by a high level of non-uniformity. A list of journals (125 titles) in which Russian works on education issues had been published was compiled. Russian organizations (308) and domestic researchers (about two thousand) engaged in studying the issues of education were identified. It was discovered that more than 200 organizations and about 400 academicians from 60 foreign countries had participated in Russian studies on the education issues.

Analysis of the Relationships between Balance Ability and Walking in Terms of Muscle Activities and Lower Limb Kinematics and Kinetics

Biomechanics ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 190-201
Author(s):  
Pathmanathan Cinthuja ◽  
Graham Arnold ◽  
Rami J. Abboud ◽  
Weijie Wang
Keyword(s):  
Regression Analysis ◽  
Lower Limb ◽  
Linear Regression Analysis ◽  
Multivariate Linear Regression Analysis ◽  
Vastus Medialis ◽  
Balance Test ◽  
Balance Ability ◽  
Limb Kinematics ◽  
Lower Limb Kinematics ◽  
Kinematics And Kinetics

There is a lack of evidence about the ways in which balance ability influences the kinematic and kinetic parameters and muscle activities during gait among healthy individuals. The hypothesis is that balance ability would be associated with the lower limb kinematics, kinetics and muscle activities during gait. Twenty-nine healthy volunteers (Age 32.8 ± 9.1; 18 males and 11 females) performed a Star Excursion Balance test to measure their dynamic balance and walked for at least three trials in order to obtain a good quality of data. A Vicon® 3D motion capture system and AMTI® force plates were used for the collection of the movement data. The selected muscle activities were recorded using Delsys® Electromyography (EMG). The EMG activities were compared using the maximum values and root mean squared (RMS) values within the participants. The joint angle, moment, force and power were calculated using a Vicon Plug-in-Gait model. Descriptive analysis, correlation analysis and multivariate linear regression analysis were performed using SPSS version 23. In the muscle activities, positive linear correlations were found between the walking and balance test in all muscles, e.g., in the multifidus (RMS) (r = 0.800 p < 0.0001), vastus lateralis (RMS) (r = 0.639, p < 0.0001) and tibialis anterior (RMS) (r = 0.539, p < 0.0001). The regression analysis models showed that there was a strong association between balance ability (i.e., reaching distance) and the lower limb muscle activities (i.e., vastus medialis–RMS) (R = 0.885, p < 0.0001), and also between balance ability (i.e., reaching distance) and the lower limb kinematics and kinetics during gait (R = 0.906, p < 0.0001). In conclusion, the results showed that vastus medialis (RMS) muscle activity mainly contributes to balance ability, and that balance ability influences the lower limb kinetics and kinematics during gait.

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