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Sports Biomechanics

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https://www.readbyqxmd.com/read/29160152/effect-of-wetted-surface-area-on-friction-pressure-wave-and-total-drag-of-a-kayak
#1
Beatriz B Gomes, Leandro Machado, Nuno V Ramos, Filipe A V Conceição, Ross H Sanders, Mário A P Vaz, João Paulo Vilas-Boas, David R Pendergast
Using theoretical principles, the components of drag (friction DF, pressure DPR and wave DW) of a single-seat kayak were analysed. The purpose was to examine the effect of changes in wetted surface area due to changes in kayaker's weight and the relative contribution of DF, DPR and DW to the total passive drag as function of velocity. The total passive drag values were based on experimental data collected in a single-seat kayak. Three different kayaker simulated weights were tested - 65, 75 and 85 kg. DF was the drag component that contributed the greatest percentage (between 60 and 68% at 5...
November 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29141506/triathlon-transition-study-quantifying-differences-in-running-movement-pattern-and-precision-after-bike-run-transition
#2
Christian Weich, Randall L Jensen, Manfred Vieten
Various publications discuss the discrepancies of running in triathlons and stand-alone runs. However, those methods, such as analysing step-characteristics or ground-contact time, lack the ability to quantitatively discriminate between subtle running differences. The attractor method can be applied to overcome those shortcomings. The purpose was to detect differences in athletes' running patterns (δM) and movement precision (δD) by comparing a 5,000 m run after a prior cycling session (TRun) with an isolated run over the same distance (IRun)...
November 15, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29141500/considerations-for-the-use-of-functional-principal-components-analysis-in-sports-biomechanics-examples-from-on-water-rowing
#3
John Warmenhoven, Stephen Cobley, Conny Draper, Andrew Harrison, Norma Bargary, Richard Smith
The proliferation of new biomechanical technology in laboratory and field settings facilitates the capture of data-sets consisting of complex time-series. An understanding of the appropriate statistical approaches for analysing and interpreting these data-sets is required and the functional data analysis (FDA) family of statistical techniques has emerged in the biomechanical literature. Given the use of FDA is currently in its infancy with biomechanical data, this paper will form the first of a two part series aiming to address practical issues surrounding the application of FDA techniques in biomechanics...
November 15, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29141496/power-and-pacing-calculations-based-on-real-time-locating-data-from-a-cross-country-skiing-sprint-race
#4
Mikael Swarén, Anders Eriksson
Pacing strategies in cross-country skiing have been investigated in several studies. However, none of the previous studies have been verified by collected skiing data giving the skiing velocities along a measured track. These can be used to calculate the propulsive power output. Collected real-time positioning data from a cross-country sprint skiing race were used to estimate the propulsive power by applying a power balance model. Analyses were made for the time-trial and the final for one female and one male skier...
November 15, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29132264/leg-amputation-side-determines-performance-in-curve-sprinting-a-case-study-on-a-paralympic-medalist
#5
Johannes Funken, Kai Heinrich, Steffen Willwacher, Ralf Müller, Jonas Böcker, Hiroaki Hobara, Gert-Peter Brüggemann, Wolfgang Potthast
The lower limb kinetics of curve sprinting in amputees are not well described in the literature, particularly with respect to the effect of the side of amputation. This is an issue due to the importance of the knowledge for prosthetic design and classification of athletes. Thus, the aim of this study was to investigate the influence of side of amputation on curve sprinting performance in athletes with a unilateral leg amputation. A three-dimensional motion analysis system (Vicon), four force plates (Kistler) and a modified mathematical human model (ALASKA) were used to compare clockwise and counter clockwise curve sprinting lower limb kinematics and kinetics of a Paralympic medalist with a left-sided knee exarticular amputation...
November 13, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29129137/citation-metrics-of-excellence-in-sports-biomechanics-research
#6
Duane Knudson
This study extended research on key citation metrics of winners of two career scholar awards in sports biomechanics. Google Scholar (GS) was searched using Harzing's Publish or Perish software for the 13 most recent winners of the ISBS Geoffrey Dyson Award and the ASB Jim Hay Memorial Award. Returned records were corrected for author, and publications excluded for all but peer-reviewed journal articles, proceedings articles, chapters and books in English. These recent award winners had published about 150 publications that had been cited typically 4,082 and 6,648 times over a 26- and 28-year period before receiving these career awards for sports biomechanics research...
November 13, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29129134/divided-attention-during-cutting-influences-lower-extremity-mechanics-in-female-athletes
#7
Thomas Gus Almonroeder, Thomas Kernozek, Stephen Cobb, Brooke Slavens, Jinsung Wang, Wendy Huddleston
Anterior cruciate ligament (ACL) injuries in basketball appear to be more common when players are in possession of the ball. The greater risk of ACL injury when in possession of the ball may result from the athlete's inability to fully attend to their movement. However, it is also possible that having to carry/manipulate the ball restricts the athlete's ability to utilise their upper extremities for stability during a manoeuvre. The purpose of this study was to explore how possession of a basketball and divided attention influence lower extremity mechanics during cutting and landing...
November 13, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29129132/reliability-of-force-velocity-relationships-during-deadlift-high-pull
#8
Wei Lu, Sébastien Boyas, Marc Jubeau, Abderrahmane Rahmani
This study aimed to evaluate the within- and between-session reliability of force, velocity and power performances and to assess the force-velocity relationship during the deadlift high pull (DHP). Nine participants performed two identical sessions of DHP with loads ranging from 30 to 70% of body mass. The force was measured by a force plate under the participants' feet. The velocity of the 'body + lifted mass' system was calculated by integrating the acceleration and the power was calculated as the product of force and velocity...
November 13, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29129121/the-validity-and-intra-tester-reliability-of-markerless-motion-capture-to-analyse-kinematics-of-the-bmx-supercross-gate-start
#9
Josephine Grigg, Eric Haakonssen, Evelyne Rathbone, Robin Orr, Justin W L Keogh
The aim of this study was to quantify the validity and intra-tester reliability of a novel method of kinematic measurement. The measurement target was the joint angles of an athlete performing a BMX Supercross (SX) gate start action through the first 1.2 s of movement in situ on a BMX SX ramp using a standard gate start procedure. The method employed GoPro® Hero 4 Silver (GoPro Inc., USA) cameras capturing data at 120 fps 720 p on a 'normal' lens setting. Kinovea 0.8.15 (Kinovea.org, France) was used for analysis...
November 13, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29125040/reliability-of-horizontal-force-velocity-power-profiling-during-short-sprint-running-accelerations-using-radar-technology
#10
Kim David Simperingham, John B Cronin, Simon N Pearson, Angus Ross
Radar technology can be used to perform horizontal force-velocity-power profiling during sprint-running. The aim of this study was to determine the reliability of radar-derived profiling results from short sprint accelerations. Twenty-seven participants completed three 30 m sprints (intra-day analysis), and nine participants completed the testing session on four separate days (inter-day analysis). The majority of radar-derived kinematic and kinetic descriptors of short sprint performance had acceptable intra-day and inter-day reliability [intraclass correlation coefficient (ICC) ≥ 0...
November 10, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29125036/bivariate-functional-principal-components-analysis-considerations-for-use-with-multivariate-movement-signatures-in-sports-biomechanics
#11
John Warmenhoven, Stephen Cobley, Conny Draper, Andrew Harrison, Norma Bargary, Richard Smith
Sporting performance is often investigated through graphical observation of key technical variables that are representative of whole movements. The presence of differences between athletes in such variables has led to terms such as movement signatures being used. These signatures can be multivariate (multiple time-series observed concurrently), and also be composed of variables measured relative to different scales. Analytical techniques from areas of statistics such as Functional Data Analysis (FDA) present a practical alternative for analysing multivariate signatures...
November 10, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29119862/static-and-dynamic-accuracy-of-a-magnetic-inertial-measurement-unit-used-to-provide-racket-swing-kinematics
#12
Benjamin Kane Williams, Ross H Sanders, Joong Hyun Ryu, Pitre C Bourdon, Philip Graham-Smith, Peter J Sinclair
Magnetic-inertial measurement units (MIMUs) are becoming more prevalent in sports biomechanics and may be a viable tool to evaluate kinematic parameters. This study examined the accuracy of a MIMU to estimate orientation angles under static conditions and dynamically from a squash racket during a forehand drive shot. A MIMU was mounted onto a goniometer and moved through 0-90°, with static data collected at 10° increments during 10 repetitions of all three axes. Typical error analyses showed the MIMU to be very reliable (TE ≤ 0...
November 9, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29099339/corrigendum
#13
(no author information available yet)
No abstract text is available yet for this article.
November 3, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29037111/head-and-neck-size-and-neck-strength-predict-linear-and-rotational-acceleration-during-purposeful-soccer-heading
#14
Jaclyn B Caccese, Thomas A Buckley, Ryan T Tierney, Kristy B Arbogast, William C Rose, Joseph J Glutting, Thomas W Kaminski
There is increasing societal concern about the long-term effects of repeated impacts from soccer heading, but there is little information about ways to reduce head impact severity. The purpose of this study was to identify factors that contribute to head acceleration during soccer heading. One-hundred soccer players completed 12 controlled soccer headers. Peak linear (PLA) and rotational (PRA) accelerations were measured using a triaxial accelerometer and gyroscope. Head acceleration contributing factors were grouped into 3 categories: size (head mass, neck girth), strength (sternocleidomastoid, upper trapezius) and technique [kinematics (trunk, head-to-trunk range-of-motion), sternocleidomastoid and upper trapezius activity]...
October 16, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28994335/erratum
#15
(no author information available yet)
No abstract text is available yet for this article.
October 10, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28982270/resistance-characteristics-of-innovative-eco-fitness-equipment-a-water-buoyancy-muscular-machine
#16
Wei-Han Chen, Ya-Chen Liu, Hsing-Hao Tai, Chiang Liu
This paper propose innovative eco-fitness equipment-a water buoyancy muscular machine (WBM machine) in which resistance is generated by buoyancy and fluid resistance. The resistance characteristics during resistance adjustment and under isometric, concentric, eccentric and isokinetic conditions were investigated and compared to a conventional machine with metal weight plates. The results indicated that the isometric, concentric and eccentric resistances could be adjusted by varying the water volume; the maximum resistances under isometric, concentric and eccentric conditions were 163...
October 5, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28975846/backstroke-start-performance-the-impact-of-using-the-omega-obl2-backstroke-ledge
#17
Gordon E Barkwell, James P Dickey
FINA recently approved the backstroke ledge (Omega OBL2) to improve backstroke start performance in competition, but its performance has not been thoroughly evaluated. The purpose of this study was to compare the mechanics of starts performed with and without the OBL2. Ten high-level backstroke swimmers performed three starts with, and three starts without, the OBL2. A wall-mounted force plate measured the lower limb horizontal impulse, vertical impulse, take-off velocity and take-off angle. Entry distance, time to 10 m and start of hip and knee extension were recorded using video cameras...
October 4, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28949273/reliability-of-a-commercially-available-and-algorithm-based-kinetic-analysis-software-compared-to-manual-based-software
#18
Kevin M Carroll, John P Wagle, Kimitake Sato, Brad H DeWeese, Satoshi Mizuguchi, Michael H Stone
There is a need for reliable analysis techniques for kinetic data for coaches and sport scientists who employ athlete monitoring practices. The purpose of the study was: (1) to determine intra- and inter-rater reliability within a manual-based kinetic analysis program; and (2) to determine test-retest reliability of an algorithm-based kinetic analysis program. Five independent raters used a manual analysis program to analyse 100 isometric mid-thigh pull (IMTP) trials obtained from previously collected data...
September 26, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28933236/evaluating-the-contribution-of-lower-extremity-kinetics-to-whole-body-power-output-during-the-power-snatch
#19
Sangwoo Lee, Kyle D DeRosia, Landon M Lamie
This study evaluated the contribution of lower extremity (hip, knee and ankle) net joint torques (NJT) to whole body power (WBP) output during the power snatch (PS). Ten experienced weightlifters (five males and five females) performed five trials of the PS with 60% of one repetition maximum. Lower extremity NJT and WBP were extracted through a three-dimensional motion analyses and used for data analyses. Pearson correlation coefficients were obtained to observe the relationship between lower extremity NJT and WBP...
September 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28929936/time-course-of-the-acute-effects-of-core-stabilisation-exercise-on-seated-postural-control
#20
Jordan B Lee, Stephen H M Brown
Core stabilisation exercises are often promoted for purposes ranging from general fitness to high-performance athletics, and the prevention and rehabilitation of back troubles. These exercises, when performed properly, may have the potential to enhance torso postural awareness and control, yet the potential for achieving immediate gains has not been completely studied. Fourteen healthy young participants performed a single bout of non-fatiguing core stabilisation exercise that consisted of repeated sets of 2 isometric exercises, the side bridge and the four-point contralateral arm-and-leg extension...
September 20, 2017: Sports Biomechanics
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