ISBS (International Society of Biomechanics in Sports): Conference Proceedings Archive
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HOW MUCH IS ENOUGH? MAINTAINING THE BIOMECHANICAL BENEFITS OF AN ACL INJURY PREVENTION TRAINING PROGRAM
Get PDFThis study investigated the effect of a 16-week maintenance training program which directly followed a high-dose 9 week initial training intervention, as part of a biomechanically informed ACL injury prevention program. Three-dimensional kinematic and kinetic data of elite female hockey players (n=16) were collected at baseline, post initial training and post maintenance training during unplanned sidestepping. Maintenance training was effective in retaining reduced peak knee valgus moments in a ‘high-risk’ subgroup elicited from the initial training program. Conversely, although the total group demonstrated no benefits following initial training, they displayed a reduction (?-26.3%, g=0.30) in peak valgus knee moments following maintenance training, suggesting a prolonged albeit moderate dose of training was effective for this population
COMPARISON OF TWO PREPARATION PROCEDURES (HARROWING VS. ROLLING) APPLIED TO AN EQUESTRIAN SPORT ARENA: EFFECTS ON THE DYNAMIC VARIABLES IN 3 HORSES LANDING AFTER A JUMP
Get PDFThe purpose of this study was to compare the dynamic variables recorded on 3 horses landing after a jump on an arena surface (sand & fibre mix) after application of two classical preparation procedures: harrowing and rolling. Each horse, equipped with a dynamometric horseshoe and an accelerometer on its right forehoof, performed 6 jumps alternatively on each prepared surface, landing alternatively at right and left lead. The maximal vertical deceleration and the energy of vibrations (>50Hz) at impact significantly decreased with harrowing, on both limbs. The braking force and braking loading rate were greater on the rolled surface but only in the leading limb. The vertical loading rate and, in the leading limb only, the maximal vertical force, were significantly larger on the rolled surface, which suggests that preparation affected the surface deeper than expected
GROUND REACTION FORCE COMPARISON BETWEEN BOTH FEET DURING GIANT SLALOM TURNS IN ALPINE SKIING
Get PDFThe purpose of this study was to measure the difference in normal force under both feet during alpine skiing giant slalom turns. Eleven experienced alpine skiers performed a giant slalom course at race intensity. All trials were recorded synchronously using a video camera and a plantar pressure measuring system. The mean force on the grouped two feet varied from 0.7 BW at the start of a turn to 1.5 BW during the steering phase of a turn performed in a steep slope condition. When skiing on FLAT slope condition, it reached only 1.3 BW. Results also showed that the outside foot receives significantly more pressure than the inside foot during the entire turn except the initiation phase. This last finding is not affected by slope steepness
EFFECT OF PILATES BASED EXERCISE ON BODY SWAY AND SHOOTING PERFORMANCE OF BRAZILIANS POLICE
Get PDFThis study investigated the effect of a 10-week Pilates practice on core stability, shooting performance and body sway in fifteen policemen (25.3 ± 3 years; 171 ± 9 cm; 71.6 ± 12.1 kg). The policeman performed 10 pistol shots and had the three dimensional ground reaction forces data (AMTI-OR-06, USA and gun target fluctuation point (SCATT USB Professional Trainer) registered during 5s prior shooting. Shooting score was also determined. Core stability was accessed by the double lowering limb (DLL) test. Although the Mann- Whitney U test showed that the Pilates practice significantly improve the core stability, no changes was observed on body sway or shooting performance. Ten weeks of Pilates practice was effective to improve core stability in policemen, but it was not able to decrease body sway during shooting or the ability of the shooter hit the target
MINIMAXX PLAYER LOAD AS AN INDEX OF THE CENTER OF MASS DISPLACEMENT? A VALIDATION STUDY
Get PDFThe purpose of this study was to assess the concurrent validity of the player load computed by the MinimaxX accelerometers by comparing it to the player load computed by a gold standard method based on in series force platforms. Fourteen participants were instrumented with two accelerometers (MinimaxX S4, Catapult, Australia) during specific team sport displacements performed on the force plates. Pearson correlation coefficients were ranged from 0.74 to 0.93 while the coefficients of variation varied from 6.9 to 16.4%. The standard error of the estimate was small
INVESTIGATION OF ATM PROPULSION FORCE-TIME PROFILES USING FUNCTIONAL DATA ANALYSIS ON FRONT CRAWL SPRINT SWIMMERS
Get PDFThe purpose of this investigation was to assess whether characteristics of the Assisted Towing Method (ATM) propulsive force-time profiles can discriminate between elite and sub-elite male sprint swimmers. Eleven elite and seven sub-elite sprint front crawl swimmers completed the ATM protocol to capture propulsion force-time profiles. The second full stroke cycle taken from the median propulsion trial on both the right and left arms were selected and functional data analysis was used to process the trials. Functional principal components analysis (fPCA) results revealed a statistical difference between the elite and sub-elite groups (p > 0.000). Further, within the elite group profiles, a distinctive double peak was found. The double peak profile could suggest a more efficient and effective stroking ratio of active drag and propulsion within the elite group
KINETIC ANALYSIS OF DIFFERENT RUNNING STARTS: IMPACT ON FORWARD CENTER OF MASS ACCELERATION AND PERFORMANCE
Get PDFIn this study, three running starts allowing more or less large shifts of the centre of pressure (CoP) were compared in order to assess their impact on the forward acceleration of the centre of mass (CoM) and on the performance of a short distance run. Temporal and biomechanical parameters were calculated from CoP data in eighteen subjects. Our results suggested that an increase of the base of support by moving backward the CoP quickly after the start signal has a positive impact on the performance on short distance runs
EFFECTS OF EXERCISES INTENSITY ON FACIAL HEAT DISTRIBUTION IN MALE SUBJECTS AND RELATIONSHIP WITH FEELING SCALE
Get PDFThe purpose of this study is to identify the effects of exercises intensity on facial thermoregulation and to evaluate the relationships between changes in men’s facial temperature and changes in affect that occur during muscular exercise. Moreover, a special attention has been paid on the possible relationship between the skin facial temperature and the heart rate of subjects. Fifty-four male performed a 12 min long session of aerobic exercise at moderate-to-high intensity. IR cartographies were performed using an IR camera. Pleasure and displeasure levels were assessed repeatedly over the exercise session
ELEMENTARY SCHOOL BOYS’ SOCCER KICK SKILL ANALYSIS
Get PDFThe purpose of this study is aimed to analyze elementary school boys’ kicking skills on the perspective of motor skills. The data is collected by Vicon Motion Analysis System (250Hz). The parameters include the compare of the instant joint angles and the time proportion during the process of the kicking toward the different kick performance groups. The participants are 36 elementary boy soccer players (age: 11.7±0.3 yrs; height: 1.42±0.13 m; weight: 37.5±13.0 kg). The subjects were divided to two groups according to the instance kicking ball speed. The result indicated that the high ball speed group players have greater extremity joint angles than the low ball speed group. No difference was found on the time proportion during the process of the kicking. We suggest that the learning of kicking skill can start with the lower speed in the beginner stage
ATTACK HEIGHT AND JUMP HEIGHT FOR MEN’S VOLLEYBALL PLAYERS
Get PDFThe purpose of this current study was to investigate the factors that associate with the ball contact height for men’s volleyball players and the difference between good and poor volleyball players. Ten male collegiate volleyball players (club teams) were recruited (BH: 1.82 ± 0.09m; BW: 80.13 ± 13.22kg). Each subject performed 3 successful trials of volleyball attack performance by hitting the ball above the net and inside the boundary. 3D motion analysis (3 digital cameras) was used to obtain kinematic data of the performance. Results indicated that ball contact height was significantly associated with takeoff and reach height. When all heights were normalized to body height, player’s body positions at instant of takeoff and ball contact are important to ball contact height