ISBS (International Society of Biomechanics in Sports): Conference Proceedings Archive
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VIDEO-BASED MARKER-LESS TRACKING SYSTEM IN GAIT ANALYSIS
Get PDFAn alternative to the 30 motion marker-based optical camera capture is the Star Tracker 3D, a marker-less video-based tracking system. The aim of our study is to investigate the efficacy of the Star Tracker 3D. A series of gait analysis tests were carried out on ten subjects with a marker and marker-less tracking system simultaneously. The study suggests potential application in gait analysis in the academic classrooms and clinical settings where observations of anatomical motions can provide meaningful feedback
WIRELESS REAL-TIME PUNCHING FORCE MEASUREMENT AND LANDING LOCATION CAPTURE BOXING SCORING SYSTEM
Get PDFThis article was to disclose an objective boxing scoring system by capturing punching force and landing location wirelessly to augment subjective judgment official AlBA scoring system for scoring blow decision. A FlexiForce sensor was embedded at the scoring knuckle part in each closed boxing glove with a battery-powered microcontroller with wireless communication. Head guard and body guard padding were embedded with tactile switches located at legitimated landing locations with microcontrollers. A ringside computer was used to capture signals from gloves, head guards and body guards of both boxers in competition for real-time punching force and landing location information processing for scoring judgment. The system was demonstrated as proposal towards AlBA President and executive committees during 2008 Olympic Qualifying Round in Bangkok
IDENTIFYING GAIT ASYMMETRY USING DIGITAL SENSORS
Get PDFThe purpose of this study was to determine which phases and kinematics were easier to identify gait asymmetry by using digital sensors. Sixteen participants were recruited in this study. The participants were requested to walk naturally under two conditions (with or without asymmetrical load). Four digital sensor sets were attached on 4 limbs to collect kinematics data. The results showed that only the AS1 of Medial-Later acceleration of upper limb on the stance phase significantly different between unloading and loading conditions; on the lower limb were AS1 of Superior-Inferior acceleration and Flex/Extension angular velocity on the swing phase. The digital sensors that attach on upper and lower limbs both can detect gait asymmetry, but the asymmetrical phase and kinematics are different on upper and lower limbs
DO FIELD HOCKEY PLAYERS REQUIRE A SPORT-SPECIFIC BIOMECHANICAL ASSESSMENT TO CLASSlFY THEIR ANTERIOR CRUClATE LIGAMENT INJURY RISK?
Get PDFThe lower limb biomechanics of 13 elite female hockey players were compared between 1) a generic, and 2) a hockey-specific (i.e., flexed trunk and hockey stick present) ACL injury risk movement assessment. Our aim was to determine if an athlete\u27s ACL injury risk classification differed as a function of their movement assessment. An increase in trunk, hip and knee flexion was observed during the hockey-specific movement assessment. No significant differences in key ACL injury risk factors (i.e., peak three dimensional knee moments) were observed. These results show that imposing hockeyspecific requirements during a lab based movement assessment did not change an athlete\u27s ACL injury risk classification when compared to a generic movement assessment
COMPARISON OF STATIC BALANCE MEASURES WITH HEIGHT AND WEIGHT ADJUSTMENTS BETWEEN TAEKWONDO AND HANDBALL PLAYERS
Get PDFThis study aimed to compare the static balance of taekwondo athletes and handball players. Considering the body size might affect the sway during static balance testing as the inverted pendulum model demonstrated. The static balance of the subjects was evaluated by the Bidex Balance System. The results showed that the APSI, MLSI and OSI of taekwondo athletes were significantly lower than those of the handball players. Moreover, the three stability indices of the two groups of athletes were significantly correlated with height and weight, but not age. The data showed that body size were positively related to the sway in the static balance testing. The taekwondo athletes were lighter than the handball players in average, nevertheless, lower height-and-weight adjusted stability indices of the taekwondo athletes were found
BAREFOOT RUNNING TRAINING: IMPLlCATtONS FOR JOINT STIFFNESS AND MUSCULAR CO-ACTWAlION
Get PDFTo determine the influence of barefoot training on neuromuscular w-activation of lower limb muscles on variables associated with injury risk during running. Trained shod runners (n=23) participated in a barefoot running program. Joint stiffness, agonist: antagonist co-activation and the co-activation index were calculated. A progressive barefoot training program induces longer co-activation of the shank complex and lower ankle stiffness in the barefoot condition. Footwear is implicated in changing injury risk factors whether soft tissue or bony related injuries. This paper suggests barefoot training as an avenue for rehabilitating ankle injuries as it promotes an even distribution of joint stillness and lower ankle stiffness when compared to shod running
MUSCLE MECHANICS FOR EXERCISE PERFORMANCE ENHANCEMENT
Get PDFSome examples are introduced to enhance exercise performance (from a single joint movement to running and jumping). There actually are numerous factors affecting exercise performance in but not limited to biomechanical, physiological, medical, and engineering aspects. In this session, I will focus on muscle mechanics that can be "manipulated" with some devices executable by a practitioner or with the use of artificial apparatuses
IMPROVING THE ACCURACY OF LOW-COST GNSS BY FUSION WITH INERTIAL AND MAGNETIC SENSORS IN ALPINE SKI RACING
Get PDFFor analysing performance in alpine ski racing, an accurate estimation of the skier\u27s centre of mass trajectory and speed is indispensable. However, the sole use of low-cost GNSS might not be accurate enough to detect meaningful differences. The aim of this study was to introduce a new system that can improve the accuracy of a low-cost GNSS to an acceptable level. To this end, the data obtained by low-cost GNSS was fused with data form inertial sensors and position information of permanent magnets buried into the snow surface along the ski track. This fusion improved the system\u27s accuracy from 2m to 0.5m. Despite the added sensing technologies, the system remained simple and was easy to use. Further improvements are possible and a technical validation of the system could be a major aim for the future
INFLUENCE OF FATIGUE IN THE SELECTED KINEMATIC PARAMETERS OF HURDLE CLEARANCE IN 400 METRE RACE - IN SEARCH OF AN ACCURATE TRAINING TEST
No full textThe paper describes a initial study on the effects of fatigue on the selected kinematic parameters of hurdle clearance. Original test involving a hurdles race over 5 hurdles on a curve was used. The analysis concerned clearing the third hurdle in the initial and final (after the 200 m hurdles race) phase of the race. The study analyzed 15 parameters in five phases of hurdle clearance estimated using the particle swarm optimization algorithm. The material was recorded with a 100 Hz industrial camera. The results indicate that the basic parameters in the changes of a hurdling technique influenced by fatigue include: length of the hurdle clearance and landing distance past the hurdle
DETECTION OF FOOT CONTACT AND TOEIOFF USING KINEMATIC DATA FOR TREADMILL RUNNING OVER A WIDE RANGE OF SPEEDS
Get PDFThe purposes of this study were to propose a method for simply and accurately detecting the foot contact and toe-off events during treadmill running over a wide range of speeds and to examine the validity and accuracy of the method. Three patterns of foot-strike were distinguished from the foot kinematic data. The thresholds for foot contact and toe-off were determined inductively based on the minimum height of the heel or metatarsal for each foot-strike pattern with regard to running speed. The estimate for foot contact and toe off indicates that this method can apply over a wide range of speeds with high accuracy