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Sports Biomechanics

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https://www.readbyqxmd.com/read/28534436/perceptions-of-sport-science-students-on-the-potential-applications-and-limitations-of-blended-learning-in-their-education-a-qualitative-study
#1
Justin W L Keogh, Lisa Gowthorp, Michelle McLean
This study sought to gain insight into blended learning-naive sports science students' understanding and perceptions of the potential benefits and limitations of blended (hybrid) learning, which has been defined as the thoughtful integration of face-to-face and online instructional approaches. Five focus groups, each comprising 3-4 students from either the undergraduate or postgraduate sports science programmes were conducted. The focus groups were facilitated by a researcher who was not involved in sports science...
May 23, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28534433/skating-start-propulsion-three-dimensional-kinematic-analysis-of-elite-male-and-female-ice-hockey-players
#2
Jaymee R Shell, Shawn M K Robbins, Philippe C Dixon, Philippe J Renaud, René A Turcotte, Tom Wu, David J Pearsall
The forward skating start is a fundamental skill for male and female ice hockey players. However, performance differences by athlete's sex cannot be fully explained by physiological variables; hence, other factors such as skating technique warrant examination. Therefore, the purpose of this study was to evaluate the body movement kinematics of ice hockey skating starts between elite male and female ice hockey participants. Male (n = 9) and female (n = 10) elite ice hockey players performed five forward skating start accelerations...
May 23, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28523981/classification-of-lunge-biomechanics-with-multiple-and-individual-inertial-measurement-units
#3
Martin A O'Reilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian Caulfield
Lunges are a common, compound lower limb resistance exercise. If completed with aberrant technique, the increased stress on the joints used may increase risk of injury. This study sought to first investigate the ability of inertial measurement units (IMUs), when used in isolation and combination, to (a) classify acceptable and aberrant lunge technique (b) classify exact deviations in lunge technique. We then sought to investigate the most important features and establish the minimum number of top-ranked features and decision trees that are needed to maintain maximal system classification efficacy...
May 19, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28464750/effects-of-forefoot-bending-stiffness-of-badminton-shoes-on-agility-comfort-perception-and-lower-leg-kinematics-during-typical-badminton-movements
#4
Sang-Kyoon Park, Wing-Kai Lam, Sukhoon Yoon, Ki-Kwang Lee, Jiseon Ryu
This study investigated whether an increase in the forefoot bending stiffness of a badminton shoe would positively affect agility, comfort and biomechanical variables during badminton-specific movements. Three shoe conditions with identical shoe upper and sole designs with different bending stiffness (Flexible, Regular and Stiff) were used. Elite male badminton players completed an agility test on a standard badminton court involving consecutive lunges in six directions, a comfort test performed by a pair of participants conducting a game-like practice trial and a biomechanics test involving a random assignment of consecutive right forward lunges...
May 2, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28355967/joint-power-generation-differentiates-young-and-adult-sprinters-during-the-transition-from-block-start-into-acceleration-a-cross-sectional-study
#5
Sofie Debaere, Benedicte Vanwanseele, Christophe Delecluse, Dirk Aerenhouts, Friso Hagman, Ilse Jonkers
The aim of this study was to investigate differences in joint power generation between well-trained adult athletes and young sprinters from block clearance to initial contact of second stance. Eleven under 16 (U16) and 18 under 18 (U18) promising sprinters executed an explosive start action. Fourteen well-trained adult sprinters completed the exact same protocol. All athletes were equipped with 74 spherical reflective markers, while an opto-electronic motion analysis system consisting of 12 infrared cameras (250 Hz, MX3, Vicon, Oxford Metrics, UK) and 2 Kistler force plates (1,000 Hz) was used to collect the three-dimensional marker trajectories and ground reaction forces (Nexus, Vicon)...
March 29, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28298168/comparison-of-two-methodological-approaches-for-the-mechanical-analysis-of-single-joint-isoinertial-movement-using-a-customised-isokinetic-dynamometer
#6
Mathieu Plautard, Gaël Guilhem, Vincent Fohanno, Antoine Nordez, Christophe Cornu, Arnaud Guével
Compared to isokinetic and isometric tests, isoinertial movements have been poorly used to assess single-joint performance. Two calculation procedures were developed to estimate mechanical performance during single-joint isoinertial movements performed on a customised isokinetic dynamometer. The results were also compared to appreciate the effects of measurement systems and calculation procedures. Five participants performed maximal knee extensions at four levels of resistance (30, 50, 70 and 90% of the one-repetition maximum, 1-RM)...
March 16, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28281390/reliability-of-lower-limb-biomechanics-in-two-sport-specific-sidestep-cutting-tasks
#7
Kam-Ming Mok, Roald Bahr, Tron Krosshaug
The purpose of this study was to assess the within- and between-session reliability of lower limb biomechanics in two sport-specific sidestep cutting tasks performed by elite female handball and football (soccer) athletes. Moreover, we aimed at determining the minimum number of trials necessary to obtain a reliable measure. Nineteen elite female handball and 22 elite female football (soccer) athletes (M ± SD: 22 ± 4 yrs old, 168 ± 5 cm, 66 ± 8 kg) were tested. The reliability was quantified by intra-class correlations (ICCs), typical error and Spearman's rank correlation...
March 10, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28372537/a-biomechanical-comparison-of-successful-and-unsuccessful-power-clean-attempts
#8
Kristof Kipp, Carolyn Meinerz
Although the power clean is an almost ubiquitous exercise in the strength and conditioning setting, relatively little is known about the biomechanics of successful and unsuccessful power clean lift attempts. The purpose of this study was to determine biomechanical differences between successful and unsuccessful power clean lift attempts in male collegiate athletes. Fifteen male lacrosse players (Age: 20.1 ± 1.2; Height: 1.78 ± 0.07 m; Body mass: 80.4 ± 8.1 kg; Relative one-repetition maximum power clean: 1...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27998206/determination-of-a-quantitative-parameter-to-evaluate-swimming-technique-based-on-the-maximal-tethered-swimming-test
#9
Rafael Soncin, Bruno Mezêncio, Jacielle Carolina Ferreira, Sara Andrade Rodrigues, Rudolf Huebner, Julio Cerca Serrão, Leszek Szmuchrowski
The aim of this study was to propose a new force parameter, associated with swimmers' technique and performance. Twelve swimmers performed five repetitions of 25 m sprint crawl and a tethered swimming test with maximal effort. The parameters calculated were: the mean swimming velocity for crawl sprint, the mean propulsive force of the tethered swimming test as well as an oscillation parameter calculated from force fluctuation. The oscillation parameter evaluates the force variation around the mean force during the tethered test as a measure of swimming technique...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27846785/the-three-dimensional-kinetic-behaviour-of-the-pelvic-rotation-in-maximal-sprint-running
#10
Natsuki Sado, Shinsuke Yoshioka, Senshi Fukashiro
The purpose of this study was to investigate the effect of lumbosacral kinetics on sprinting. Twelve male sprinters performed 50 m sprints at maximal effort. Kinematic and ground reaction force data were recorded at approximately 40 m from sprint commencement. A whole-body inverse dynamics approach was applied to calculate joint forces and torques at the hip and lumbosacral joints. The contribution of the hips and lumbosacral joint torques to pelvic rotation was subsequently calculated, with joint force powers indicating the rate of mechanical energy transfer between segments across joint centres calculated for both hip joints...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27659068/the-volleyball-athlete-s-shoulder-biomechanical-adaptations-and-injury-associations
#11
Dimitrios Challoumas, Antonio Stavrou, Georgios Dimitrakakis
In volleyball, the dominant shoulder of the athlete undergoes biomechanical and morphological adaptations; however, definitive conclusions about their exact nature, aetiology, purpose and associations with shoulder injury have not been reached. We present a systematic review of the existing literature describing biomechanical adaptations in the dominant shoulders of volleyball players and factors that may predispose to shoulder pain/injury. A thorough literature search via Medline, EMBASE and SCOPUS was conducted for original studies of volleyball players and 15 eligible articles were identified...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27593384/relationship-between-foot-strike-pattern-running-speed-and-footwear-condition-in-recreational-distance-runners
#12
Roy T H Cheung, Rodney Y L Wong, Tim K W Chung, R T Choi, Wendy W Y Leung, Diana H Y Shek
Compared to competitive runners, recreational runners appear to be more prone to injuries, which have been associated with foot strike patterns. Surprisingly, only few studies had examined the foot strike patterns outside laboratories. Therefore, this study compared the foot strike patterns in recreational runners at outdoor tracks with previously reported data. We also investigated the relationship between foot strike pattern, speed, and footwear in this cohort. Among 434 recreational runners analysed, 89...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27593193/differences-in-take-off-leg-kinetics-between-horizontal-and-vertical-single-leg-rebound-jumps
#13
Yasushi Kariyama, Hiroaki Hobara, Koji Zushi
This study aimed to clarify the differences between the horizontal single-leg rebound jump (HJ) and vertical single-leg rebound jump (VJ) in terms of three-dimensional joint kinetics for the take-off leg, while focusing on frontal and transverse plane movements. Eleven male track and field athletes performed HJ and VJ. Kinematic and kinetic data were calculated using data recorded with a motion capture system and force platforms. The hip abduction torque, trunk lateral flexion torque (flexion for the swing-leg side), hip external and internal torque, trunk rotational torque, and the powers associated with these torques were larger when performing HJ because of resistance to the impact ground reaction force and because of pelvic and posture control...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27592682/effect-of-fatigue-on-reaction-time-response-time-performance-time-and-kick-impact-in-taekwondo-roundhouse-kick
#14
Jader Sant'Ana, Emerson Franchini, Vinicius da Silva, Fernando Diefenthaeler
Reaction time and response time are considered important abilities and can potentially affect combat performance. This study investigated the effect of a specific fatigue protocol on reaction time, response time, performance time, and kick impact. Seven male athletes reported to the laboratory on two different days. During day one, athletes performed a specific progressive taekwondo test, and on day two, a protocol for determining reaction time, response time, performance time, and kick impact before and after a time to exhaustion test at an intensity level corresponding to the maximal kick frequency obtained during the specific progressive taekwondo test...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27588733/validity-of-a-portable-force-platform-for-assessing-biomechanical-parameters-in-three-different-tasks
#15
Ricardo Peterson Silveira, Pro Stergiou, Felipe P Carpes, Flávio A de S Castro, Larry Katz, Darren J Stefanyshyn
The aim of this study was to determine the precision and accuracy of the vertical and anterior-posterior force components of the portable PASCO PS-2142 force plate. Impulse, peak force, and time to peak force were assessed and compared to a gold standard force plate in three different tasks: vertical jump, forward jump, and sprint start. Two healthy male participants performed ten trials for each task, resulting in 60 trials. Data analyses revealed good precision and accuracy for the vertical component of the portable force plate, with relative bias and root mean square (RMS) error values nearly the same in all tasks for the impulse, time to peak force, and peak force parameters...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27256719/biomechanical-differences-between-left-and-right-handed-baseball-pitchers
#16
Matthew J Solomito, Joel V Ferreira, Carl W Nissen
Left-handed baseball pitchers are thought to have a number of theoretical advantages compared to right-handed pitchers; however, there is limited scientific research detailing differences in the pitching mechanics of right- and left-handed pitchers. Therefore, this study sought to understand whether any kinematic and kinetic differences existed between right- and left-handed baseball pitchers. A total of 52 collegiate pitchers were included in this study; 26 left-handed pitchers were compared to 26 age-, height-, weight- and ball velocity-matched right-handed pitchers...
June 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27595163/glenohumeral-contact-force-during-flat-and-topspin-tennis-forehand-drives
#17
Yoann Blache, Thomas Creveaux, Raphaël Dumas, Laurence Chèze, Isabelle Rogowski
The primary role of the shoulder joint in tennis forehand drive is at the expense of the loadings undergone by this joint. Nevertheless, few studies investigated glenohumeral (GH) contact forces during forehand drives. The aim of this study was to investigate GH compressive and shearing forces during the flat and topspin forehand drives in advanced tennis players. 3D kinematics of flat and topspin forehand drives of 11 advanced tennis players were recorded. The Delft Shoulder and Elbow musculoskeletal model was implemented to assess the magnitude and orientation of GH contact forces during the forehand drives...
March 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27435030/effect-of-a-brazilian-jiu-jitsu-simulated-tournament-on-strength-parameters-and-perceptual-responses
#18
Daniele Detanico, Rodolfo André Dellagrana, Marina Saldanha da Silva Athayde, Rafael Lima Kons, Angel Góes
This study aimed to analyse the effects of a simulated Brazilian jiu-jitsu (BJJ) tournament on vertical jump performance, grip strength test and perceived effort responses. 22 male BJJ athletes participated in a simulated tournament consisting of three 7 min matches separated by 14 min of rest. Kimono grip strength test (KGST), counter movement jump (CMJ) and rate of perceived exertion (RPE) were measured before and after each match, while RPE of specific areas was assessed after three matches. ANOVA for repeated measures was used to compare strength parameters after each match with the level of significance set at 5%...
March 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27418231/comparison-of-lower-limb-kinetics-during-vertical-jumps-in-turnout-and-neutral-foot-positions-by-classical-ballet-dancers
#19
Akiko Imura, Yoichi Iino
The purpose of this study was to investigate the effect of hip external rotation (turnout) on lower limb kinetics during vertical jumps by classical ballet dancers. Vertical jumps in a turnout (TJ) and a neutral hip position (NJ) performed by 12 classical female ballet dancers were analysed through motion capture, recording of the ground reaction forces, and inverse dynamics analysis. At push-off, the lower trunk leaned forward 18.2° and 20.1° in the TJ and NJ, respectively. The dancers jumped lower in the TJ than in the NJ...
March 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/27414395/optimal-sampling-frequency-in-recording-of-resistance-training-exercises
#20
Paolo Bardella, Irene Carrasquilla García, Marco Pozzo, Julio Tous-Fajardo, Eduardo Saez de Villareal, Luis Suarez-Arrones
The purpose of this study was to analyse the raw lifting speed collected during four different resistance training exercises to assess the optimal sampling frequency. Eight physically active participants performed sets of Squat Jumps, Countermovement Jumps, Squats and Bench Presses at a maximal lifting speed. A linear encoder was used to measure the instantaneous speed at a 200 Hz sampling rate. Subsequently, the power spectrum of the signal was computed by evaluating its Discrete Fourier Transform. The sampling frequency needed to reconstruct the signals with an error of less than 0...
March 2017: Sports Biomechanics
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