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Peak Rate Of Trunk Energy Outflow Differs Between Pitch Types In Softball Pitchers, Jessica Downs Talmage, Nicole M. Bordelon, Anthony W. Fava, Gretchen Oliver
Peak Rate Of Trunk Energy Outflow Differs Between Pitch Types In Softball Pitchers, Jessica Downs Talmage, Nicole M. Bordelon, Anthony W. Fava, Gretchen Oliver
ISBS Proceedings Archive
In softball players, it is unclear how certain pitch types may increase the risk of injury. The purpose of this study was to determine energy flow differences in the trunk and upper-arm segments between pitch types. Twenty-three softball pitchers participated. Absolute values of trunk energy inflow (IF) and outflow (OF), and upper arm IF, as well as segment energy flow when normalized to pitch speed were assessed in three pitch types. Differences between trunk energy OF were found between fastballs compared to curveballs and dropballs. When normalized to pitch speed, trunk energy OF only differed between fastballs and dropballs. For …
Efficiency Index Used To Assess Shoulder Stress In College Softball Pitchers Throughout A Simulated Game, Adam R. Nebel, Anthony W. Fava, Nicole M. Bordelon, Gretchen D. Oliver
Efficiency Index Used To Assess Shoulder Stress In College Softball Pitchers Throughout A Simulated Game, Adam R. Nebel, Anthony W. Fava, Nicole M. Bordelon, Gretchen D. Oliver
ISBS Proceedings Archive
Shoulder distraction forces in softball pitching are known to have a positive impact on performance yet a negative impact on musculoskeletal health. The purpose of this study was to assess changes in shoulder stress across innings pitched using Efficiency Arm-Stress Index (EASI) scores. Motion capture was used on collegiate softball pitchers pitching a simulated game. Peak shoulder distraction force was obtained using inverse dynamics procedures and used to calculate an EASI score (fastball velocity divided by peak shoulder distraction force in percent body weight). A RM·ANOVA revealed inning had no effect on EASI score (F[6,7]=1.28, p=0.286). Understanding a pitcher’s efficiency …
Movement Variability In Elbow And Wrist Kinematics Of New Ball Outswing Bowling In Cricket Fast Bowlers, Cody Lindsay, Rian Crowther, Kane Middleton Dr, Brad Clark, John Warmenhoven, Wayne Spratford
Movement Variability In Elbow And Wrist Kinematics Of New Ball Outswing Bowling In Cricket Fast Bowlers, Cody Lindsay, Rian Crowther, Kane Middleton Dr, Brad Clark, John Warmenhoven, Wayne Spratford
ISBS Proceedings Archive
This study investigated between-bowler movement variability of wrist and elbow kinematics during new ball swing bowling. A 3D motion analysis system captured the bowling action and ball trajectory of 11 pre-elite and elite fast bowlers delivering outswing. Kinematics were normalised to 100% of the delivery stride between back foot contact and ball release. A statistical parametric mapping approach using one-way ANOVAs investigated inter-individual movement variability. Significant differences were found in all kinematic parameters except for wrist radial/ulnar deviation angular velocity with bowlers using small amounts in either direction at the beginning of the phase. This study highlights that high-level athletic …
The Influence Of Court Surfaces On Lower Limb Muscle Activation Of Tennis Run-And-Stroke, Zi-Jun Lin, Jiun-Bo Chang, Kai-Lung Chang, Wen-Tzu Tang
The Influence Of Court Surfaces On Lower Limb Muscle Activation Of Tennis Run-And-Stroke, Zi-Jun Lin, Jiun-Bo Chang, Kai-Lung Chang, Wen-Tzu Tang
ISBS Proceedings Archive
This study aimed to examine the characteristics of lower extremity muscle activity between different tennis court surfaces. Six male right-handed elite tennis players were recruited, and their electromyography activity (EMG) during open stance running forehand were collected. Average activity level of rectus femoris (RF), biceps femoris (BF), gastrocnemius (GAS), tibialis anterior (TA) from the lead leg, which normalized by maximal voluntary isometric contractions (MVC) was recorded under different situation (hard court, grass court, clay court). Our study demonstrates that GAS was significantly different and the activation level was greater on a hard court than on clay (p = .005). …
Force Profile Of Functional Leg Muscle Groups In Curve Sprinting - Preliminary Results, Johannes Funken, Marvin Zedler, Svea Lüdorff, Tobias Alt, Kai Heinrich, Wolfgang Potthast
Force Profile Of Functional Leg Muscle Groups In Curve Sprinting - Preliminary Results, Johannes Funken, Marvin Zedler, Svea Lüdorff, Tobias Alt, Kai Heinrich, Wolfgang Potthast
ISBS Proceedings Archive
Research on lower extremity joint and muscle kinetics in athletic curve sprinting is under-represented in the scientific literature. This is an issue due to its importance for training and rehabilitation protocols as well as for injury prevention. In this study, we analysed six male sprinters regarding their force profile of functional lower extremity muscle groups in curve sprinting. Three-dimensional motion capture (Vicon) and four force plates (Kistler) were used to capture kinematic and kinetic data. Inverse dynamic calculations (Anybody), including muscle forces, provide first insights into potential side differences of leg muscle group force profiles between the inside and the …
Looking For Optimal Biomechanical Configurations In Weightlifting And Powerlifting : Theoretical And Experimental Approaches, Charlotte Vedel, Benyebka Bou-Saïd Pr, David Dureisseix Pr
Looking For Optimal Biomechanical Configurations In Weightlifting And Powerlifting : Theoretical And Experimental Approaches, Charlotte Vedel, Benyebka Bou-Saïd Pr, David Dureisseix Pr
ISBS Proceedings Archive
This work is part of a big project whose goal is to combine mechanical principles with the physical characteristics of athletes to develop a personalized virtual model optimized to help lifters improve their performance while reducing their injury risks. This study concentrates on the qualitative comparison between a virtual skeleton model of a squatting athlete numerically designed on MATLAB and the squatting patterns of elite athletes of the French national team (n=15). Comparing the results of the two approaches revealed differences in the Center Of Pressure (COP) movement during the squat as well as motor behaviour and velocity. After discussion …
Ball Speed Predictors In Slide Attacks In Female Volleyball Players, Tina Stefanovic, Jacopo Zamporri, Arnel L. Aguinaldo
Ball Speed Predictors In Slide Attacks In Female Volleyball Players, Tina Stefanovic, Jacopo Zamporri, Arnel L. Aguinaldo
ISBS Proceedings Archive
The purpose of this study was to investigate ball speed predictors of slide attacks and provide direct parameters for their proper execution. Healthy collegiate female volleyball players (n = 8) were recruited. After a warm-up, 3 successful slide attacks per participant and their ball speed were recorded using an 8-camera motion capture system and a radar gun. COM approach speed, maximum angular velocity of pelvis and torso rotation in the arm cocking phase, and maximum angular velocity of torso rotation, shoulder IR, and elbow extension in the arm acceleration phase were calculated for the trial with the fastest ball speed. …
Comparison Of Isokinetic Force Of The Internal And External Rotators Of The Shoulders Between Swimmers Of Alternate And Simultaneous Techniques, Yves S. Santos, Neicivana Carneiro, Marcos Franken, Kelly De Jesus, Karla De Jesus, Alexandre Medeiros
Comparison Of Isokinetic Force Of The Internal And External Rotators Of The Shoulders Between Swimmers Of Alternate And Simultaneous Techniques, Yves S. Santos, Neicivana Carneiro, Marcos Franken, Kelly De Jesus, Karla De Jesus, Alexandre Medeiros
ISBS Proceedings Archive
The aim of this study was to compare the peak torque and the strength ratio between the external and internal swimmers’ right and left shoulder rotators between alternate and simultaneous swimming techniques. Sixteen competitive swimmers (3 females and 13 males) were divided equally into two groups, alternate and simultaneous swimming techniques. The experimental protocol consisted of three maximum concentric repetitions of internal rotation and external rotation of the shoulder at an angular velocity of 60°/s and twenty repetitions at a velocity of 180°/s, with a two minutes interval between speeds and four minutes in the change of laterality of the …
Lower Limb Asymmetry During The Skeleton Push Start, Michael Muckelt, Laurie Needham, Ezio Preatoni, Steffi Colyer
Lower Limb Asymmetry During The Skeleton Push Start, Michael Muckelt, Laurie Needham, Ezio Preatoni, Steffi Colyer
ISBS Proceedings Archive
The aim of this study was to identify the presence and performance implication of asymmetry within the skeleton push start. Motion data were captured on 13 international skeleton athletes, using a custom 9-camera computer vision system. 6 maximal effort pushes were captured allowing the reconstruction of a 0–15 m push. Intra-limb differences for spatiotemporal variables and the change in velocity (ΔV) across a step were analysed. A negative relationship existed between 5 – 15 m split time and ΔV across a stride. Athletes who maximise their velocity across a stride were more likely to perform well in the skeleton push …
The Road To 2024 Olympic Gold Medal: A Case Report Of Three Elite Beach Volleyball Players, Alexandre Medeiros, Karla De Jesus, Francisco Oliveira Neto, Lucas Palermo, Geovanne Messias
The Road To 2024 Olympic Gold Medal: A Case Report Of Three Elite Beach Volleyball Players, Alexandre Medeiros, Karla De Jesus, Francisco Oliveira Neto, Lucas Palermo, Geovanne Messias
ISBS Proceedings Archive
The anthropometrics, limbs maximum isometric force and jump performance in beach-volleyball players were described. Three female elite beach volleyball players selected to participate in the 2022 World Championships Circuit were recruited to participate in the study. Body composition, squat, supine, and rowing isometric maximal force, and power test, squat, and countermovement jumps were measured. Body fat percentage varied between 13 and 24.2%. Squat, supine and rowing isometric force (N) presented median (M) and interquartile ranges (IQR) of 145 (128, 186.6), 40 (33, 66.75) and 65.2 (57.6, 76,6). The height (cm), absolute (W) and relative power (W/kg) M and IQR range …
The Relationship Between Horizontal Force-Velocity Profile And Vertical Strength In Female Ice Hockey Players, Mary Claire Geneau Ms, Daniel J. Geneau Mr, Paul Gastin Dr, Lachlan James Dr, Marc Klimstra Dr, Ming-Chang Tsai Dr
The Relationship Between Horizontal Force-Velocity Profile And Vertical Strength In Female Ice Hockey Players, Mary Claire Geneau Ms, Daniel J. Geneau Mr, Paul Gastin Dr, Lachlan James Dr, Marc Klimstra Dr, Ming-Chang Tsai Dr
ISBS Proceedings Archive
The primary purpose of this study was to evaluate the horizontal force-velocity (HFV) profiles of female collegiate ice hockey players and compare these to metrics of muscular strength. The secondary purpose of this study was to categorize strength metrics using reduction analyses to improve the interpretation and application of these results and that of future studies. Thirteen female ice hockey players (body mass = 66.7±18.0 kg; height = 171.6±6.2 cm) completed three 50-meter on-ice sprints. Instantaneous velocity was measured using a radar gun in which participant HFV profile metrics (maximal velocity, tau, force-velocity slope, maximum theoretical force, ratio decrease force) …
Benefits Of Drafting On The Leading Cyclist: A Preliminary Field Study, Miguel A. Benito, Alba Herrero-Molleda, Juan Garcia-Lopez
Benefits Of Drafting On The Leading Cyclist: A Preliminary Field Study, Miguel A. Benito, Alba Herrero-Molleda, Juan Garcia-Lopez
ISBS Proceedings Archive
The effect of drafting on the aerodynamic drag of a trailing cyclist has been widely investigated. However, no experimental field study has quantified under field conditions the potential benefit of this strategy on the leading cyclist, which is the purpose of the present study. Therefore, a protocol based in a previous study performed in velodrome (García-López et al., 2014) was designed. Results indicate that drafting decrease the leading cyclist’s drag area (CdA) by 2.6 and 3.3%, and the trailing cyclist’ CdA by 31.9 and 19.3%, depending on the trailing cyclist position on the bicycle (i.e., aero vs. …
Trunk Motion During A Half-Marathon: The Impact Of Perceived Fatigue On Motion Stability And Smoothness, Salil Apte, Nathan Laroche, Vincent Gremeaux, Kamiar Aminian
Trunk Motion During A Half-Marathon: The Impact Of Perceived Fatigue On Motion Stability And Smoothness, Salil Apte, Nathan Laroche, Vincent Gremeaux, Kamiar Aminian
ISBS Proceedings Archive
Our objective was to investigate the effects of acute fatigue on stability and smoothness of trunk motion during a half marathon. 13 recreational runners were fitted with a GNSS-IMU sensor on their chest. Every 10 minutes of the race, the participant pronounced their perceived fatigue, recorded by a smartphone attached to the arm. We divided the race into 8 equal segments, corresponding to one fatigue score per segment, and considered only level running. Based on mediolateral acceleration and running velocity (v), stability was characterized by spectral entropy, RMS of acceleration (RMSA), and autocorrelation between successive steps …
Comparative Biomechanical Analysis Of A Female Hammer Throw Athlete For Back-To-Back American Record Years, Nicholas Miller, Suzanne Konz, Steven Leigh
Comparative Biomechanical Analysis Of A Female Hammer Throw Athlete For Back-To-Back American Record Years, Nicholas Miller, Suzanne Konz, Steven Leigh
ISBS Proceedings Archive
Hammer athletes must optimize performance variables to maximize their official distance. Analysis of key performance variables might explain how the subject improved an American record year in 2018 to another record in 2019. A 3-D analysis was performed on trial videos from 2018 and 2019. Release height, release velocity, release angle, and hip-shoulder separation were compared among years and throws, and their relationship with official distance was assessed. Release height (p < 0.01) and release angle (p < 0.01) were more consistent in 2019 than 2018. The relationships among official distance, release height (p = 0.06), and hip-shoulder separation (p = 0.04) were different between years. The efficient use of hip-shoulder …
An Automated Method For The Estimate Of Vertical Jump Power Through Inertial Measurement Units, Guido Mascia, Valentina Camomilla
An Automated Method For The Estimate Of Vertical Jump Power Through Inertial Measurement Units, Guido Mascia, Valentina Camomilla
ISBS Proceedings Archive
Vertical jump performance analysis allows for assessing the ability of the lower limb to generate mechanical power. The analysis performed with inertial measurement units (IMUs) is affected by inertial effects of wobbling masses. To compensate for them, an automated method was developed to estimate peak and mean concentric power based on anthropometric and time-frequency features. IMU data of 47 countermovement- (CMJ) and 50 squat- jumps (SJ) performed by 17 participants were used. Force platform data were used to obtain reference power values. Features were chosen according to the best subset regression method, devising a multiple linear regression for each estimated …
Medio-Lateral Acceleration Of Female Athletes With An Acl Reconstruction In Comparison With A Healthy Population, Siân Atkinson, Holly A. Stock, Ezio Preatoni
Medio-Lateral Acceleration Of Female Athletes With An Acl Reconstruction In Comparison With A Healthy Population, Siân Atkinson, Holly A. Stock, Ezio Preatoni
ISBS Proceedings Archive
We assessed change of direction abilities in team sport female athletes. Ten participants returned to full activity from ACL reconstruction (ACLR) for longer than one year and 10 healthy controls (CON) were compared. Twelve maximal effort 45° cutting manoeuvres from the reconstructed side (ACLR) or a random selection of both sides (CON) were analysed for each individual using a motion capture system. CON showed greater medio-lateral centre of mass (COM) acceleration between 51 and 75 % of ground contact. CON reported increased ankle plantar flexor power from 94 to 98 % of foot contact, with also a higher peak. Although …
A Kinematic Comparison Of Conventional Inswing And Outswing Bowling In Cricket, Cody Lindsay, Wayne Spratford
A Kinematic Comparison Of Conventional Inswing And Outswing Bowling In Cricket, Cody Lindsay, Wayne Spratford
ISBS Proceedings Archive
Swing bowling is an important facet of cricket, however, it has received little consideration from researchers. This study compared the bowling action and initial ball flight kinematics of inswing and outswing deliveries in 15 (male = 12, female = 3) pathway and high-performance medium and fast pace bowlers. Participants delivered the ball with their forearm, hand and the seam of the ball angled towards and away from the batter for inswing and outswing with an extended wrist flexing at ball release. Therefore, significant differences were found in forearm orientation (p < 0.001), hand orientation (p < 0.001), seam azimuth angle (p < 0.001) and swing angle (p < 0.001). By identifying similarities and differences of inswing and outswing, this study could benefit coaches to improve swing bowling performance in bowlers and provide a foundation for future research.
The Ball Orientations Used By Place Kickers At The 2019 Rugby World Cup And Their Associations With Kick Success, Sam Jones, Kevin Ball, James C. A. Peacock, Shane M. Heffernan, Neil E. Bezodis
The Ball Orientations Used By Place Kickers At The 2019 Rugby World Cup And Their Associations With Kick Success, Sam Jones, Kevin Ball, James C. A. Peacock, Shane M. Heffernan, Neil E. Bezodis
ISBS Proceedings Archive
The outcomes of place kicks can have a large impact on Rugby Union match results. This study investigated the ball orientations used in place kicking and their potential implications for success. All 416 place kicks from the 2019 Rugby World Cup were grouped into one of three ball orientation categories, and predicted odds of success were calculated for each category using a binomial logistic regression which accounted for situational factors known to affect performance outcome. Kicks taken using a slanted orientation (n = 152) had the greatest odds of success (90.0%) when taken from the mean tournament distance (29.7 m), …
Peak Lower Extremity Net Joint Moments And Joint Angles During Isometric Mid-Thigh Pulls Vary With Bar Position, Nayun Ahn, Hoon Kim, Kristof Kipp
Peak Lower Extremity Net Joint Moments And Joint Angles During Isometric Mid-Thigh Pulls Vary With Bar Position, Nayun Ahn, Hoon Kim, Kristof Kipp
ISBS Proceedings Archive
The purpose of this study was to identify the effect of bar position on the ankle, knee, and hip peak net joint moments (NJM) and associated joint angles during isometric mid-thigh pulls (IMTP). Seven female college lacrosse players performed maximal IMTP at three different bar positions (low: above patella, mid: mid-thigh, high: crease of hip) while motion capture and GRF data were recorded. Inverse dynamics was used to calculate peak ankle, knee, and hip NJM. Joint angles at peak NJM were also extracted. Main effects for bar position existed for hip NJM and hip and knee joint angles. Pair-wise comparisons …
Joint Moments During Instep Kicks In Football Players With And Without Previous Groin Pain, Anna C. Severin, Daniel B. Mellifont, Mark Gl Sayers
Joint Moments During Instep Kicks In Football Players With And Without Previous Groin Pain, Anna C. Severin, Daniel B. Mellifont, Mark Gl Sayers
ISBS Proceedings Archive
This study examined how previous groin pain and approach angle affects stance leg and lumbar moments during instep kicks. Male football players with and without previous groin pain (n=11, and n=10) performed instep kicks from 45° and 60° angles while kinetic and kinematic data were recorded (1000Hz and 500Hz respectively). 3D stance leg net joint moments of the hip, knee, and ankle were calculated at peak swing knee flexion and ball contact and the sagittal L5/S1 joint moment was examined throughout the kick. Foot speed at ball contact indicated performance. Players with previous groin pain had lower moments …
Intra-Individual Joint Angle Variation During The Take-Off Step Of Long Jumpers With Transtibial Amputation – Preliminary Results, Johannes Funken, Steffen Willwacher, Kai Heinrich, Ralf Müller, Hiroaki Hobara, Alena M. Grabowski, Wolfgang Potthast
Intra-Individual Joint Angle Variation During The Take-Off Step Of Long Jumpers With Transtibial Amputation – Preliminary Results, Johannes Funken, Steffen Willwacher, Kai Heinrich, Ralf Müller, Hiroaki Hobara, Alena M. Grabowski, Wolfgang Potthast
ISBS Proceedings Archive
Biomechanical knowledge of the long jump take-off step is not comprehensive for athletes with below the knee amputation (BKA), yet it is important for improving training protocols and performance. Three-dimensional motion capture (Vicon) and a mathematical rigid-body model (Dynamicus, Alaska) were used to calculate joint angles during repeated long jump take-off steps of athletes with and without BKA. Preliminary results indicate that those athletes with BKA who perform better during the long jump compared to another athlete with BKA, have relatively high intra-individual joint angle variation at the knee and hip joint at the instant of take-off compared to non-amputee …
A Comparison Of The National Basketball Association’S Annual National Basketball Association Draft Combine 2001 To 2018, Olivia D. Perrin, Randall L. Jensen
A Comparison Of The National Basketball Association’S Annual National Basketball Association Draft Combine 2001 To 2018, Olivia D. Perrin, Randall L. Jensen
ISBS Proceedings Archive
The current study investigated whether athlete performances in the National Basketball Association’s (NBA) Draft Combine are changing over time. The current study was conducted with data from the 2001 (n = 78) and 2018 NBA Draft Combine (n = 69) for ten combine assessments (data from NBA.com). Results indicated that athletes from 2018 exhibited better performance in lane agility time (p < 0.05), maximum vertical jump (p < 0.05), and three-quarter court sprint (p < 0.001), but decreased performance in 185 lb. bench press (p < 0.05), and a reduction in weight (p < 0.05) and body fat percentage (p < 0.001). No significant differences were found between years for height, standing reach, wingspan, and standing vertical jump. The current study illustrates the importance of understanding how combine results may be more or less indicative of NBA success for different years.
Road Bike Damping: Comfort Or Performance Related?, Josef Viellehner, Potthast Wolfgang
Road Bike Damping: Comfort Or Performance Related?, Josef Viellehner, Potthast Wolfgang
ISBS Proceedings Archive
The aim of this study was to determine if a road bike specific damping system increases short term performance. Muscular activation of the triceps surae and quadriceps femoris, oxygen consumption, heartrate and maximum power output of thirty male, trained cyclists were recorded. The participants performed on a damped and non-damped road racing bike six-minute steady state and four-minute all-out tests with and without vibration. Vibration significantly increased the mean activation of the triceps surae and significantly increased oxygen uptake and heartrate. Damping had no impact on muscular activation, energy requirements and cardiopulmonary response. It is therefore concluded, that cycling specific …
Does Hand Speed Relate To Club Head Speed Or Ball Speed During A Golf Swing?, Anna C. Severin, Stewart A. Tackett, Hannah E. Simpson, Lowry C. Barnes, Erin M. Mannen
Does Hand Speed Relate To Club Head Speed Or Ball Speed During A Golf Swing?, Anna C. Severin, Stewart A. Tackett, Hannah E. Simpson, Lowry C. Barnes, Erin M. Mannen
ISBS Proceedings Archive
Many golf swing analyses use club or ball speed to indicate performance, although these are difficult to obtain using motion capture. This study examined the relationship between hand speed and club head and ball speeds to examine if hand can indicate performance and if different capturing frequencies affect these relationships. A 10-camera Vicon system recorded golfers performing eight golf swings (500 Hz n=11, 100 Hz n=15). A TrackMan system recorded club head and ball speed. The resultant hand speed was calculated at peak velocity, the lowest position of the hands, and at ball impact. Hand speed at ball impact and …
Acute Spatiotemporal And Muscle Excitation Reponses To Wearable Lower Limb Loading During Maximal Velocity Sprinting, Oliver Hurst, Liam Kilduff, Michael Johnston, John Cronin, Neil Bezodis
Acute Spatiotemporal And Muscle Excitation Reponses To Wearable Lower Limb Loading During Maximal Velocity Sprinting, Oliver Hurst, Liam Kilduff, Michael Johnston, John Cronin, Neil Bezodis
ISBS Proceedings Archive
This study quantified the mechanical effects of adding light wearable loads to the thigh or shank segments during maximal velocity sprinting. Eight university level sprinters performed two 40 m sprints under each condition (unloaded, thigh loaded, shank loaded) in a randomised order, and effects were analysed using magnitude based inferences. In both loaded conditions, there was a possibly small decrease in step velocity which was associated with a likely small decrease in step rate and no clear difference in step length. There was a likely small increase in contact time in the thigh-loaded condition, and possibly small increases in both …
Coordination Variability Associated With Attendence To A Longitudinal Reducing Biofeedback Schedule, Franky Mulloy, David Mullineaux, Gareth Irwin, Genevieve William,S
Coordination Variability Associated With Attendence To A Longitudinal Reducing Biofeedback Schedule, Franky Mulloy, David Mullineaux, Gareth Irwin, Genevieve William,S
ISBS Proceedings Archive
The aim of this paper was to assess skill exploration via coordinated variability (CoordVar) during attendance to a longitudinal, reducing biofeedback (BFb) intervention. Novices (n=15 BFb; n=15 Control) were introduced to a lunge touch task. Visual BFb were given on the timing and magnitude of rear leg kinematics. A modified CI2 method (CI2area) was used to quantify CoordVar for rear leg joint couplings. Coefficient of variability was used to quantify CoM horizontal velocity as performance variability (PerfVar). Linear regression 95% confidence intervals were compared between groups to assess changes over time. The BFb group demonstrated increasing CoordVar as a response …
Rectus Femoris Mechanics In Rugby Kicking, Neil E. Bezodis, Stephanie Lazarczuk, Jurdan Mendiguchia, Thomas Love
Rectus Femoris Mechanics In Rugby Kicking, Neil E. Bezodis, Stephanie Lazarczuk, Jurdan Mendiguchia, Thomas Love
ISBS Proceedings Archive
This study aimed to quantify rectus femoris muscle-tendon unit length and excitation during different types of rugby kick. Seven male rugby players completed a series of kicks during which kinematic and muscle excitation data were collected. Between 0.2 and 0.1 s prior to ball contact in all kick types, the rectus femoris lengthened rapidly whilst muscle excitation also rapidly increased, identifying eccentric action as a possible mechanism for muscle strain injury. Peak rectus femoris muscle excitations occurred later in the kicks with a primary height demand, and differences in the timing of peak muscle excitation existed between different regions of …
Pseudo-3d Binary Silhouette For Augmented Golf Coaching, Kam Yuk (Leona) Chan, Boris Bačić
Pseudo-3d Binary Silhouette For Augmented Golf Coaching, Kam Yuk (Leona) Chan, Boris Bačić
ISBS Proceedings Archive
The purpose of this paper is to report the augmented golf coaching implications of novel annotations solutions and silhouette-based video transformations from commonly used video sources. The annotations include ‘one-click’ 3D grid drawing and automated club head tracking. The developed software is based on computer vision approaches to facilitate golf coaching from beginner to intermediate skill-level players and was tested on two driving ranges under different lighting conditions. The end-session reporting enables coaches to provide visual annotations of elements of swing performance with additional privacy preservation of captured media files into two-colours pseudo-3D silhouette. Future work is aimed at advancements …
Center Of Mass Displacement During The Badminton-Specific Speed Test, Uwe G. Kersting, Roos Bulthuis, Filip G. Lysdal, Christian M. Madsen
Center Of Mass Displacement During The Badminton-Specific Speed Test, Uwe G. Kersting, Roos Bulthuis, Filip G. Lysdal, Christian M. Madsen
ISBS Proceedings Archive
The purpose of this study was to identify movement strategies of elite badminton players when carrying out a badminton specific speed test. Twenty-one international elite badminton players participated with whole-body kinematics collected using 15 high-speed infrared cameras. Center of Mass (CoM) movement analysis was conducted using Visual3D (C-Motion Inc., USA). CoM energy and total power, peak CoM velocity and postural sway were analysed. Genders were compared by t-tests and relationship between completion time and the investigated parameters was tested using Pearson Correlation tests. Male players were lowering their CoM 7 cm more than females. A significant correlation was found among …
Analysis Of Skier Kinetics During The Start And Kinematics Over The First Features During A Ski Cross Run, Matteo Aita, Uwe G. Kersting
Analysis Of Skier Kinetics During The Start And Kinematics Over The First Features During A Ski Cross Run, Matteo Aita, Uwe G. Kersting
ISBS Proceedings Archive
The aim of this study was to analyse the start and the skiing technique in Ski Cross, and relate them to the performance. The project consisted of two parts: an indoor test was conducted to relate the impulse applied by the skiers on the start handles to their velocity at handle release. Further, an outdoor test was conducted to study the skiers’ kinematics over the first features of a Ski Cross run, and relate it to completion time of the first section (~30 m). Five athletes from the Swedish National Team were tested on several occasions using an instrumented start …