ISBS (International Society of Biomechanics in Sports): Conference Proceedings Archive
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EFFECT OF FATIGUE ON RUNNING KINETIC ASYMMETRY IN NONCONTINUOUS & CONTINUOUS CONSTANT SPEED PROTOCOL
Get PDFKinetic asymmetries in running gait are well studied but their interaction with muscular fatigue, perceived exertion and/or metabolic stress, need further attention to understand and report limb laterality with fatigue progression during a non-continuous & a continuous constant speed protocols. For study, 13 young male runner\u27s data for kinetic asymmetry (KA), stride rate (SR), blood lactate (BLa), muscular fatigue (RPEM) and overall body feel (RPEo) were collected. Kendall\u27s tau-b reported a non-significant correlation between KA, SR and RPEM and a significant correlation between BLa, RPEo and RPEM whereas Tuckey post hoc test revealed non-significant effect of RPEM on KA and SR in both tests. Findings suggest that, observed KA with fatigue progression may be subject to inter-individual coordinated motor control based on overall running physiological state of body as there has no direct correlation been found with BLa, RPEM and RPEo in this study
FEAR-IN DUCED CHANGES IN BREAKFALL Kl N EMATlCS FOR OSOTO-GARI IN NOVICE JUDOKAS
Get PDFAwareness of the risk and incidence of injury during the breakfall movement may lead to a perceived fear, which could be detrimental to breakfall kinematics and may even increase the risk of judo-related head injuries. Therefore, our aim was to investigate the association between the perceived fear of the breakfall movement and breakfall kinematics for osoto-gari in novice judokas. Eight experienced and 10 novice judokas volunteered to participate in this study. Motion data of the breakfall for osoto-garl was collected using a three-dimensional motion analysis technique. We found a similar trend in the joint angle curve and peak neck extension momentum for novice judokas who perceived fear of the breakfall and for those who did not. The results indicate that perceived fear of the breakfall movement may not be associated with a novice judoka\u27s breakfall motion skill for osoto-gari
THE INFLUENCE OF BASEBALL PITCHING ON THE HARDNESS OF THE FLEXOR PRONATOR MUSCLES - USING ULTRASOUND REALTIME TISSUE ELASTGRAPHY
Get PDFThe purpose of this study was to examine changes of the individual hardness of the flexor - pronator muscle group after pitching. The twelve normal male volunteers who had played baseball participated in this study. One hundred pitches were performed, and the individual flexor pronator muscles hardness were analyzed using ultrasound real time tissue elastgraphy (RTE) both before and after 100 pitching. The hardness of the flexor pronator muscles were not significant different between before and after pitching. However, hardness of the most hardened muscle was significantly different between before and after pitching. Therefore RTE is useful method to manage of the pitching counts in pitchers who performed athletic rehabilitation after throwing injuries
RELATIONSHIPS BETWEEN TRUNK AND KNEE ACCELERATION AND THE GROUND REACTION FORCE DURING SINGLE LIMB LANDING
No full textThe purpose of this study was to investigate the relationship between the ground reaction force and acceleration of the knee and trunk. We measured trunk and knee acceleration, as well as ground reaction force during single limb landing in 7 female basketball players. The associations between trunk and knee accelerations and vertical ground reaction force were analyzed by using correlation coefficients. Strong correlations were found between peak vertical ground reaction force and peak acceleration of the medial, vertical, and posterior trunk, trunk resultant, vertical knee, as well as knee resultant. It is possible to evaluate the variable movements during sports or sports-related activity by analyzing the acceleration of body segments
THE PERSONALISED \u27DIGITAL ATHLETE\u27: An evolving vision for the capture, modelling and simulation, of on-field athletic performance
Get PDFTechnological advances in the areas of three-dimensional (3D) body scanning, in-vivo imaging and novel forms of motion capture and data analytics (e.g. deep learning neural networks) are rapidly bridging the lab versus field-based nexus that has historically plagued the applied sport biomechanist. Similarly, exponential advances in hardware and computer processing power has witnessed the emergence of the personalised \u27digital athlete\u27, an overarching vision that facilitates, via the integration of multiple technologies, real-time biomechanical data collection, modelling and reporting for immediate biofeedback
MUSCULOSKELETAL SQUAT SIMULATION EVALUATION BY MEANS OF AN INSTRUMENTED TOTAL KNEE ARTHROPLASTY
Get PDFKnowledge of internal loading conditions based on validated musculoskeletal (MS) simulations can allow improved training and rehabilitation design and monitoring. The aim of this study was to evaluate the ability of individualised reference MS models, based on comprehensive motion analysis, to determine knee joint contact forces (JCFs), as measured in 6 subjects with instrumented total knee arthroplasties (TKA) during squat exercises. Maximum simulated JCFs reached approximately 100% higher than the in vivo measured values at high joint flexion angles; however, at knee flexion angles of below -l0 degree, the models underestimated the real forces by up to 50%. Improvements of reference MS models, even if they are individualised, are clearly required, especially at joint angles -50 degree
EVALUATION OF MECHANICAL PROPERTIES OF KNEE EXTENSOR AND PATELLAR TENDON DURING SQUATTING BY MUSCLE CONTRACTION SENSOR METHOD
Get PDFThe purpose of this study was to investigate the mechanical properties of muscle-tendon can* during squatting. Fourteen males were participated in this study. The muscle activities of knee extensor during squatting were measured by surface electrompgraphy. The mechanical prop@ of knee extensor and patellar tendon were measured using a muscle contraction (MC) sensor. Muscle activities of the knee exten- during squatting showed a significant correlation to the MC signal. The mechanical properties of the knee extensor and patellar tendon were closely related to the angle of the knee joint MC signals of knee extensor shaved a consistency on each muscle related to patellar tendon. From these results, it is considered, that the method using an MC sensor is effective for evaluating the changes in dynamic tension in muscle-tendon complex during squatting
INFLUENCE OF A PROLONGED TENNIS MATCH PLAY ON TENNIS SERVE BIOMECHANICS
Get PDFThe aim of this study was to quantify biomechanical changes that occur in the serve throughout a prolonged tennis match. Serves of tennis players were recorded with a motion capture system before (T0) during (T90), and after (T180) a 3-hour match. Before and after each match, EMG data of upper limb muscles were analyzed to determine the presence of muscular fatigue. RPE and ball velocity and biomechanical variables were analyzed. Decreases in ball velocity; maximal angular velocities and increase in RPE were observed. The majority of the upper limb joint kinetics decreases between T0 and T180. No change in timing of maximal angular velocities was observed. A prolonged tennis match induces fatigue in upper limb muscles, which decreases performance and modifies serve biomechanics
BIOMECHANICAL ASSESSMENT OF CHANGE OF DIRECTION PERFORMANCE IN MALE UNIVERSITY SOCCER PLAYERS
Get PDFThe purpose of this study was to identify biomechanical variables that distinguish change of direction performance in an athletic population. Twenty varsity men’s soccer athletes were recruited. Motion capture and force plate data were collected simultaneously during the plant phase of a 505 agility test. The median time to complete the agility task was used to distinguish a “fast” group (n=10) and a “slow” group (n=10). An ANOVA (0.05 alpha level = was used to compare groups‘ kinematic and kinetic variables. Several differences were found between groups including: contact time, transition, relative horizontal to vertical ground reaction force, center of mass height, torso lean, pelvis rotation, spine rotation, hip adduction/abduction. The findings suggest that fast and slow change of direction performance adopt different technical strategies
Effect of Aquatic Exercise on Foot Pressure Balance and Posture Stability in Elderly Women
Get PDFThe purpose was investigate the foot pressure balance and body posture stability in elderly women. Sixteen elderly women participated in this study (mean age:72.63?~79.38?.46yrs, mean BMI: 25.03?.83~27.99?.78). They were divided into two groups (aqua exercise group, n=8, control group, n=8). Participants were tested before and after the study to measure foot pressure balance, body posture stability and advanced balance ability(limits of stability) were measured Biorescure(RM Ingenierie Co, France) which has % quarterly sector(RF, LF, RB, LB). Aqua exercise training program was performed for 50minutes per session, 3times per week for 12weeks. Data was analyzed with ANOVA for repeated measures, t-test using SPSS ver 19.0 program. Aquatic exercise considered a senior citizen fall prevention and improved quality of life