ISBS (International Society of Biomechanics in Sports): Conference Proceedings Archive
Not a member yet
5464 research outputs found
Sort by
CHANGES IN POSTURAL CONTROL POST AN 8-WEEK DANCE PROGRAM IN FEMALE ELDERLY
Get PDFThis study investigated the effect of an 8wk dance program on orthostatic postural control in elderly. Thirty-four elderly participants were randomly assigned to dance group (DG: n=19; 69.1 ± 6.57 years, 72.5 ± 11.7kg) and control group (CG: n=15; 71.5 ± 7.45 years; 70.9 ± 9.3kg). A force plate was used to measure three dimensional ground reaction force data in three conditions: narrow stance position eyes open and closed and tandem position eyes open, randomly registered over a period of 60 seconds pre and post the intervention. The mean velocity sway and the COP path area were calculated. The results showed that the ballroom dancing program with low/moderate intensity significantly improved balance. Dance would be an optimal activity for an elderly population since it can improve postural control and thus prevent fall incidence
EFFECT OF PLAYING SURFACE ON KINEMATIC MOVEMENT PATTERNS OF KNEE AND ANKLE IN FEMALE FOOTBALL PLAYERS
Get PDFThe purpose of this study was to identify the effect of playing surface on kinematic movement patterns of knee and ankle. Eight female university football players performed 16 unanticipated cutting movements on each surface (natural turf; 3G artificial turf). Kinematic data of knee and ankle joint were collected. Comparisons between the surfaces showed no differences at the ankle joint. However, significantly higher values of knee internal rotation were observed on natural turf. Additionally, effect sizes showed a consistent tendency of higher knee valgus on natural turf. These findings indicate an influence of playing surface on kinematic movement pattern of the knee joint in the frontal and transverse plane
AEROBICTRAINING FOR ATHLETES WITH ILIOTIBIAL BAND FRICTION SYNDROME WITH CONSIDERING OF ITS PATHOGENIC MECHANISM
Get PDFIliotibial band friction syndrome (ITBFS) is caused by friction between iliotibial band (ITB) and lateral femoral epicondyle. Effective aerobic training for athletes with ITBFS has not yet been reported. The purpose of this study was to propose an aerobic exercise that does not apply load on the ITB. The study consisted of 10 uninjured men. We measured hip and knee joint flexion angle during pedaling bicycle ergometer under 3 saddle height conditions. As the saddle height was lowered, the hip and knee joint flexion angles increased. Under the low saddle height condition, the ITB did not slide over. This shows that pedaling exercise in low saddle condition can be special exercise, in which athlete can get enough training effects and yet it would put less burden on the ITB
ACCURACY OF SPORT ACTION CAMERAS FOR 3D UNDERWATER MOTION ANALYSIS
Get PDFThe purpose of this study was to evaluate the accuracy of sport action cameras for 3D underwater motion analysis. Two cameras (GoPro) were fixed in the swimming pool. The image resolution was set to 1920 x 1080, the view angle was set to 127o and the frame rate was 60 Hz. A Wi-Fi remote was used to start the cameras. A wand calibration method based on radial distortion model was used to calibrate the cameras. The accuracy was evaluated in eight trials of dynamic rigid bar tests (working volume 4?1?1.5m3). The results revealed mean absolute error ranging from 1.23 mm to 1.93 mm. These values of accuracy for underwater analysis can be considered acceptable for the majority of 3D underwater motion analyses, in particular for swimming biomechanics
A COMPARSION OF METHODS TO EXAMINE DOUBLE AND SINGLE LEG DROP JUMP PERFORMANCE
Get PDFThe purpose of this study was to compare the use of both a force platform and Optojump photocell system (Microgate, Bolzano, Italy) to examine double leg and single leg drop jumps. Thirteen physically active individuals performed 5 double leg drop jumps and 5 single leg drop jumps from a height of 0.3 m. Ground contact time (CT), flight height (FH) and reactive strength index (RSI) were calculated concurrently for both jump types. Despite intraclass correlation coefficients for all variables being very close to 1, a significant systematic difference was consistently observed between both devices with the Optojump system overestimating CT and underestimating both FH and RSI for both jump types. Both devices demonstrated excellent test- retest reliability with all ICCs for CT, FH and RSI above 0.940
200 METRE AND 1000 METRE SPRINT KAYAKING BIOMECHANICAL ANALYSIS COMPARISON USING FIXED AND SWIVEL SEAT: A PILOT STUDY
Get PDFThe purpose of the present study was to investigate the effects of using the standard fixed and swivel seat on the selected kinematic and kinetic parameters. It is conducted on a simulated 200 m and 1000 m race in the laboratory setting. One elite sprint kayaker participated in this study, performing both events and seat conditions on separate days. Paired sample t-tests and Pearson product-moment correlations were performed to compare seat conditions and relations between the parameters. High correlations were observed in paddle force with foot force, paddle power and paddle velocity. Significantly increased results were found in paddle force, paddle power and stroke rate using the swivel seat especially in the 1000 m test. Further research with more subjects is required for comparison to obtain important information of an efficient paddling execution
A COMPUTER SIMULATION OF KINETICS IN LANDING OF GYMNASTICS VAULTING
Get PDFGymnasts suffer from high impact loadings during landing and/or dismounts, and injuries are not unusual. The aims of this work were to develop a method for measuring or calculating the landing GRFs, which can be applied in practice and/or competitions, and to get loadings upon lower limbs during vaulting landings. A multi-body model with 19 segments and 52 freedoms was developed on the biomechanical simulation platform, software MSC.ADAMS / LifeMod. In order to test the validity of the model, the kinematics and simulation upon a university student’s drop jump were studied. The differences of maximum GRFs obtained from simulation studies and a force plate were less than 2.0% of the maximum GRF got by the force platform. After that, a vault performed by an elite gymnast was simulated and GRFs and net joint reaction forces and torques at ankle, knee, and hip were obtained
MECHANICAL ENERGY FLOW OF THE TRUNK IN TENNIS SERVE
Get PDFThe purpose of this study was to investigate the mechanical energy flow of the trunk during tennis serve. Three-dimensional coordinates of the players performing flat, kick, and slice serves were collected. The findings were summarized as follows.1) Regardless of the spin characteristics, the mechanism that right arm acquires the mechanical energy is almost same. 2) It is important to rotate the trunk as fast as possible, when the more mechanical energy flows from the trunk to the right arm more. 3) The roles of both legs are different from the viewpoint of energetics. The lower trunk aqcuired the translational energy from the left leg mainly, and the rotational energy from the right leg mainly. And it is guessed that player selects preferentially not to flow the more mechanical energy to right arm but to swing a racquet appropriately (to generate a ball spin)
FEATURES OF TAKEOFF PHASE IN LONG JUMPS WITH VARIOUS RUN-UP LENGTHS
Get PDFThe aim of the present study was to compare the kinematic characteristics of jumper\u27s movements in long jumps with short, middle and extended run-ups. For this purpose three male and four female jumpers performed two three strides, eight strides and twelve strides run-up long jumps. All trials were captured on high-speed video. The results of the 2D analysis indicated that ground contact time and takeoff angle were significantly larger when the run-up was short. Also, the distance from the center of gravity to the heel in the horizontal plane and the knee angle at touchdown, as well as the maximum knee flexion of the takeoff leg during takeoff, were significantly smaller when the run-up was short. The heights of the center of gravity at touchdown and takeoff were constant in long jumps with various run-up lengths
ELECTROMYOGRAPHY ACTIVITIES OF UPPER AND LOWER EXTREMITIES IN TABLE TENNIS DURING FOREHAND TOPSPIN AND NO SPIN STROKE: A CASE STUDY
Get PDFThe purpose of this study was to compare upper and lower extremity muscles activations between the forehand topspin and no spin strokes. A right-handed male elite table tennis player performed 13 forehand topspin strokes and 13 forehand no spin strokes against a ball machine. Electromyography (EMG) activities from his 10 upper and lower extremity muscles were recorded during these strokes and analyzed using a wireless EMG device. According to descriptive statistics, there seemed to be high-level differences in muscular activities between forehand no spin and forehand topspin strokes