ISBS (International Society of Biomechanics in Sports): Conference Proceedings Archive
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LOWER EXTREMITY STIFFNESS DURING SEPAKTAKRAW SPIKE LANDINGS
Full text linkSepaktakraw spike landing is the aggressive skill that leads to many injury of lower extremity. Leg and knee joint stiffness is the important factor of sepaktakraw spike injury particularly when landing. The purpose of this study was to investigate lower extremity stiffness of sepaktakraw spike landings. Results showed that leg stiffness and knee joint stiffness of roll spike (RS) during landing was significant higher than half roll spike (HRS). These indicate that RS can -use a high risk of injury due to greater lower extremity stiffness than HRS. Thus sepaktakraw players need to have a good strength and flexibility of muscle to prevent potential risk of lower extremity injury during sepaktakraw spike landings
LEG DOMINANCE EFFECTS ON KNEE KINEMATICS IN UNILATERAL AND BILATERAL SQUATS
Full text linkSquatting movements are often used to assess known risk factors of injury such as knee valgus angle. This study aims to investigate the knee kinematics during unilateral and bilateral squats in relation to the dominant and non-dominant leg. Five uninjured participants completed three squats in three conditions; dominant unilateral, non-dominant unilateral and bilateral. Knee extension and valgus angles were calculated. Maximum knee valgus angle was higher in the nondominant unilateral trial than the same leg during the bilateral squat (unilateral = 10.6", bilateral = 8.4"; p < 0.05). Knee extension angles were significantly lower during bilateral squats (unilateral = 11 1 .go & 109.2", bilateral = 97.5" 8 98.2\u27; p < 0.05). Limb dominance effects knee valgus during squatting, and should therefore be taken into account during injury risk assessments
A FOOT AXIS FOR COP PATH OF OLDER ADULT SHORT ACCESS-RAMP WALKING STUDY
No full textA foot axis was developed for the investigation of whether there is any significant difference in the COP path position between uphlll and downhill walking on a short access-ramp built according to the access-ramp safety-code specifications. The investigation involved the use of signalised plantar pressure video of 15 adults who performed a two-step gait on a custom-built inclined walking access-ramp. The plantar pressure images were processed to obtain the position of the COP path relative to the new medial foot axis. The findings showed that he difference in the COP path position on the plantar surface was statistically significant at the forefoot region between uphill and downhill access-ramp walking at a recommended maximum grade of 1:s. Based on these findings, more research is needed to determine access-ramp safety-qrades for the elderly based on downhill walking characteristics
KNEE TAPING AND GROUND REACTION FORCES IN A SIT TO STAND, SQUAT, AND VERTICAL JUMPING TASKS
Full text linkThis study examined the effect of no tape commpared to Kinesiotape, Leukotape, and placebo (type of tape) on resultant ground reaction forces (GRF) in a sit to stand, full squat, and vertical jumping task (functional task). Ten participants completed four testing sessions with different taping techniques. Mean resultant GRF was measured using an AMTl force platform for three trials of each task. There was no significant main effect for resultant GRF by type of tape and functional task (F(6, 108)=.003, p=1.0). There was a significant main effect for resultant GRF by functional task (F(2, 1 17)=145, p=.0005); sit to stand GRF were significantly lower than the GRF for squatting or vertical jumping. Knee taping may affect resultant GRF but may depend on the functional task being performed
SEX-BASED DIFFERENCES IN TRUNK ACCELERATION AND LANDING POSTURE DURING THE DROP VERTICAL JUMP TEST
Full text linkThe purpose of this study was to investigate sex-based differences in trunk acceleration and landing posture during the drop vertical jump test and to determine the relationships among relevant variables. Twenty college students (10 men and 10 women) performed drop vertical jumps from a 30cm high box. Trunk acceleration and the trunk, limb, knee, and ankle angles in the sagittal plane were measured. The unpaired Student t-test and Pearson product-moment correlation coefficients were used for statistical analysis. Female participants demonstrated greater vertical trunk acceleration and smaller trunk angles than male participants did. In addition, vertical acceleration correlated with trunk and limb angles. Therefore, these parameters, which can be estimated by using wearable sensors, may be useful for checking athletes at high risk for injury
BRIDGING THE NEXUS BETWEEN SIMULATION CL INJURY PREVENTION
Full text linkThe goal of this communication is to show how human musculoskeletal modelling and simulation research can be used to help translate injury related research to effective real-world injury prevention practice. Specifically, we will show how relevant musculoskeletal and simulation research was used in the development of 1) reliable video based lower-limb injury screening tools and 2) a novel biomechanically informed lower-limb and ACL injury prevention training intervention. Special attention will be placed on how musculoskeletal and simulation research underpinned the development of the screening tools and injury prevention training protocol
ATHLETE - EQUIPMENT INTERACTION
No full textThe purpose of this research is to understand how to match an athlete to a piece of athletic equipment. Individual athlete characteristics require specific equipment parameters to optimize performance. Similarly individual movement patterns can be matched to equipment characteristics to help prevent injury. The athlete and equipment form a biomechanical system influenced by biomechanical principles such as the force-length and force-velocity relationship of skeletal muscle. By understanding the athlete-equipment interaction, sport equipment can be tuned to individual athletes to maximize performance and minimize injury
A SIMPLE METHOD TO CALIBRATE KINEMATICAL INVARIANTS: APPLICATION TO OVERHEAD THROWING
Full text linkThe aim of this paper is to present a simple calibration method aimed at optimizing the kinematical invariants of a whole body motion capture model, meaning limb lengths and some of the marker placements. A case study and preliminary results are presented and give encouraging insights about the generalized use of such a method in motion analysis in sports
A SURROGATE METHOD FOR DISCRETE MOVEMENT DATA
Full text linkSample entropy can be an effective tool for the investigation of human movement variability. However, before applying the method, it can be beneficial to employ an analysis to confirm that observed data is not solely the result of stochastic processes. This can be achieved using surrogate methods. Previous investigations have used surrogate methods within human gait data, yet no appropriate method has been applied to discrete human movement. This article proposes a surrogate method for discrete movement data. The technique reliably generated surrogates for discrete joint angle time series, effectively destroying fine-scale dynamics of the observed signal and maintaining macro structural characteristics (e.g., Mean, SD). Comparison of entropy estimates indicated that observed signals contained deterministic dynamics
RESEARCH ON DIFFERENT SIZES OF PLATFORM\u27S EFFECTS ON THE ATHLETES\u27 LEAVING PLATFORM SPEED IN THE FREESTYLE SKIING AERIAL
Full text linkThe freestyle skiing aerial skill is an advantage project to win medals at the winter Olympic Games for China. This research applies the mathematical model method, combining theory with experiment, with the help of the athletes\u27 leaving platform speed calculation software, to research and Analysis different sizes of platforms\u27 effects on the athletes\u27 leaving platform speed. The research result indicates that: the increasing of the platform height will decrease the leaving platform speed, and the decreasing range is related to the changing range. In order to ensure the specific actions\u27 required leaving platform speed, it can be solved through adjusting the sliding distance and the speed of changing postures