ISBS (International Society of Biomechanics in Sports): Conference Proceedings Archive
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POSITIVE RELATIONSHIP OF TRUNK MOVEMENTS AND ACCELERATION DURING 20M SPRINT TEST IN ELITE MALE FOOTBALL PLAYERS
Get PDFThe purpose of this study was to investigate the association between trunk movements and whole-body acceleration, velocity and performance time during an all-out 20 m sprint test. This study encompassed 21 male top level football players. The participants were equipped with a Catapult OptimEyeX4 device that included a GPS sensor, an accelerometer and a gyroscope. The results indicated that average angular velocity about the vertical axis correlated with maximal whole body acceleration. Furthermore, the sum of angular velocities about all three axes correlated with maximal acceleration. However, maximal acceleration did not correlate with maximal velocity and sprint performance time, while average acceleration did. The findings point to the importance of trunk movements, especially rotation about the vertical axis, for developing a player\u27s maximal acceleration
SUPPORT LEG JOINT CONTRIBUTIONS TO CENTRE OF MASS ACCELERATION DURING THREE PHASES OF MAXIMAL SPRINTING
Get PDFThe aim of this study was to investigate the contributions of the support leg joint moments and non-muscular forces to the horizontal and vertical acceleration of the centre of mass during three different steps in maximal sprinting. An induced acceleration analysis was performed to investigate these contributions during the third, ninth and 19th step. The horizontal and vertical contribution by the ankle joint moment increased from the third to the 19th step while the contribution by the MTP joint moment increased vertically and decreased horizontally from the third to the 19" step. The knee decelerated the centre of mass horizontally while providing vertical support in all three steps with a larger variability observed in steps three and nine. This type of analysis has the potential to quantify the effect of segment orientation on centre of mass acceleration
EFFECT OF SHORT MEDIALSIDE STUDS OM FOOT BIOMECHANICS IN COLLEGIATE SOCCER PLAYERS
Get PDFThe purpose of this study was to examine the effect of modified stud on ankle and foot kinematics, ground reaction force and forefoot force and pressure during sidestep cut (SC) and change direction (CD) movement 6 male collegiate soccer players wore original and medial-side 2mm cut stud shoes and performed SC and CD on the artificial grass. Non-parametric Wilcoxon signed-rank test was used to compare difference between the original and modified studs. The modified stud of non-dominant leg show less inversion than the original stud in SC and CD. The modified stud of non-dominant leg show more force peak form and pressure and that of nondominant legs show more pressure an the original stud during SC and CD. The short medial-side studs with 2mm length can decrease the force inversion of the nondmiiant leg during SC and CD movement and increase the force production of the lower extremities in recreational soccer players
DOES A MODIFIED FOOT-STRETCHER IMPROVE 5004 ON-WATER AND ERGOMETER ROWING PERFORMANCE TIME AND COMFORT?
No full textFoot-stretcher force contributes to rowing performance. A New Zealand designed modified rowing foot-stretcher has a rigid clog shoe with heel and toe wedges to allow contact of the whole surface of the foot to the foot-plate throughout the entire rowing stroke. This study examined the effect of modified and standard foot-stretchers for eight competitive rowers during on-water double scull and static Concept2 ergometer 500-m rowing. Race time and comfort were recorded. Comfort measures indicated that the modified foot-stretcher was preferred both on-water and ergometer. Performance time measures indicated a potential performance enhancement with the modified foot-stretcher on-water (2.0%), however due to large confidence intervals, the results were unclear. This modified foot-stretcher assisted athletes rowing comfort and showed potential for performance enhancement
INJURY RISK IN TECHNIQUE SELECTION: INFLUENCE OF HAND POSITION IN THE BACK HANDSPRING
Get PDFThis study aims to investigate the influence of hand position on the biomechanical risk factors at the wrist during the back handspring in gymnastics. Three national level female gymnasts performed five back handspring trials with *inwards, "parallels and "outward" hand positions. Synchronised three-dimensional kinematic and kinetic data were collected and inverse dynamics analysis performed to calculate internal wrist joint kinetics. Increased vertical (3.33 +-. 0.82 BW) and medio-lateral (1.74 +- 0.42 BW) force at the wrist joint during the outward hand position may lead to increased injury risk and should be discouraged in practice. However, reduced impact forms at the wrist during the inward hand position may lead to reduced wrist stress, thus lower injury potential during the back handspring
THE EFFECT OF CONCUSSION ON REACTION TIME AND DUAL TASKING ABILITY IN A SIMULATED DRIVING ENVIRONMENT: SOME PRELIMINARY RESULTS
Get PDFThe purpose of this study was to determine the effect of concussion on drivers\u27 reaction time and dual tasking ability in a simulated driving environment. Testing was performed with a STlSlM Model 400 driving simulator. Participants (27 healthy and 7 two weeks to six months post-concussion) were exposed to multiple reaction time scenarios including pedestrian, vehicle, and cyclist incursions. Dual tasking ability was measured using STlSlM dual task scenarios. There were longer reaction times in concussed participants (t(7.578)=2.342, p=.049) and a lower number of mean dual task passes in concussed participants (t(8.914)=2.558, p=.031), both of which were statistically significant. Understanding the effect concussion has on driving ability is the first step to creating a guideline for clinicians to refer to when assessing concussed patients and determining if they are fit to drive
BIOMECHANICAL ANALYSIS OF MOVEMENT TRANSFORMATION BY THE KNEE SUPPORTER WEARING
Get PDFThe purpose of this study was to clarify the effect of the soft knee brace, " knee supporter " in continuous squat motion under the fatigue condition. The results were summarized as follows; 1) the influence of knee supporter to the squat motion was different according to the subjects\u27 characteristics, but in Wear condition, almost all subjects was getting to be improved the stability of knee flexion-extension motion. 2) In Wear condition, the stability of the hip joint was decreased gradually while fatigued, because the hip joint was the compensation of knee flexion-extension motion. 3) In the variation of the changes in the knee joint flexion-extension motion from the 1st set to 10th set, the subjects could be divided into three types
EFFECTS OF PROBODY MASSAGE ON PHYSICAL CHARACTERISTICS, BODY ALIGNMENT IN THE MIDDLE-AGED WOMEN WITH MUSCULOSKELETAL DISEASES
Get PDFThe purpose of this study was to investigate the degree of improvement of physical characteristics, body alignment of the exercise group after Probody Massage Program of 8 weeks with 30 musculoskeletal diseases in middle-aged Women in B Metropolitan city. The subjects of this study were 30 musculoskeletal diseases in middle-aged in B Metropolitan city for 8 weeks twice a week, was carried out the Probody Massage Program of 60 minutes. Physiological characteristics are height, weight, BMI, an index of inflammation, body alignment was measured pretest, after 8 weeks. As the Probody Massage Program was showed a positive change in physical characteristics, body alignment with musculoskeletal diseases in middle-aged Women. Consequently it was suggested that Probody Massage with improvement and prevention for posture\u27s unbalance of musculoskeletal diseases in middle-aged Women. This program could be utilized for improvement of youth postures and physical characteristics, body alignment of musculoskeletal diseases in middle-aged Women
MECHANOMYOGRAPHIC ANALYSIS OF EXERCISE HYPERTROPHY - THE EFFECT ON MUSCLE CONTRACTILE PROPERTIES
Get PDFThis study investigated mechanomyographic (MMG) derived muscle changes during biceps brachii hypertrophy. Healthy participants (age: 23.73+- 2.67, n=19) performed unilateral biceps curls for 8 weeks (nondominant limb; treatment, dominant limb; control). Significant differences (
THE EFFECT ON INTRALIMB COORDINATION WHILE WALKING WITH THE FUNCTIONAL KNEE BRACE
Get PDFProper interjoint coordination is crucial for locomotion while wearing a knee brace. The functional knee braces are to be considered an interlimb coordination, at the same time to be maximized function without interference. The purpose of this study was to evaluate the effect on inter and intralimb coordination while walking with and without knee brace. We conducted using 30 motion analysis system for seven healthy males. Functional knee brace used in three kinds of commercial products. Comparison with brace and no brace condition, intralimb coordination has better in type of constraint knee brace (CTI) and knee stability was improved both constraint and nonconstraint knee brace (patella and neo) compared to the no brace condition. Our result will be utilized to evaluation of the effect and characterization in functional knee brace