ISBS (International Society of Biomechanics in Sports): Conference Proceedings Archive
Not a member yet
5464 research outputs found
Sort by
THE ACUTE EFFECT OF WHOLE BODY VIBRATION TRAINING ON AGILITY, SPEED AND POWER IN MALE VOLLEYBALL PLAYERS
Get PDFThe purpose of this study was to examine the acute effect of whole body vibration training on agility, speed and power in male volleyball players. Ten college volleyball players volunteered to participate in this study. The vibration training (VT) consisted of 60% with 28 Hz frequencies and 1Omm amplitudes. Counter movement jump (CMJ), blocking agility test (BAT), agility test (AT) and 10 meters sprinting (1 OMS) were performed at pre-test and post-test (60s rest). The peak force (PF). mean force (MF), maximum rate of force development (mRFD) and relative net impulse (RNI) from the CMJs were computed. A repeated measures ANOVA was applied to obtain the variables. The present study indicated that the WBV significantly improves the MF, mRFD and BAT parameters of CMJ and BAT performances excluding the PF. Speed and agility does not seem to be enhanced by VT
HOW TO GET POSTURAL STABILITY IN TAEKWONDO
Get PDFThe purpose of this study was to evaluate techniques for keeping postural stability in Taekwondo continuous fast kicks. The results were summarized as follows: i) GOOD subjects can control their movement so as to offset the angular momentum of the whole body around the horizontal axis, ii) Good subjects produce smaller angular momentum around the vertical axis to maintain stability, and iii) POOR subjects try to offset the larger angular momentum produced by larger kicking leg motion, iv) Larger kicking motion makes athlete look like POOR. Taken together, our data suggest that coaches should be aware that athletes have to limit these to utilize the knee and hip joints motion of kicking leg and support leg motion to get kicking height and driving force. These motions are also the reason why POOR subjects cannot maintain stability in continuous fast kicks
EFFECTS OF PLYOMTRIC TRAIN lNG ON MUSCLE FATIGUE AND MAXIMAL RATE OF FORCE DEVELOPMENT OF LOWER-LIMB
Get PDFThe purpose of this study was to examine the effects of ploymetric training on muscle fatigue and maximal rate of force development in volleyball players. Ten college volleyball players volunteered to participate in this study and underwent a 6-week plyometric training. The BTS free EMG and force-plate were used to evaluate the median frequency (MDF) of the rectus femoris (RF), anterior tibialis (AT), lateral gastrocnemius (LG), biceps femoris (BF) and maximum rate of force development (mRFD). The results revealed that the plyometric training significantly improves the MDF of RF and AT and mRFD. This study demonstrated hat by using plyometric training could facilitate the mRFD and postpone muscle fatigue for trained volleyball players
DIFFERENT POWER AND MUSCULAR ACTMTtES OF THE LOWER UMBS IN THE REBOUND JUMP
Get PDFThe purpose of this study is to clarify the differences in myoelectric activities and power exerting the lower limbs of the performance that is jumping height is high and low people in the rebound jump. The subjects was 23 male students belong to track and field (age : 20.8 i 0.9 years, height : 179.6 * 6.1 an, and body mass : 82.3 * 17.0 kg). The subjects performed five-repeated rebound jump (5RJ), based on the jumping height of the result, divided into jumping high-high group (GOOD) and the low group (POOR), it was compared with the lower limbs joint power and myoelectric activity. As a result, fi was dearly that differences in the performance of GOOD and POOR has become the appropriate preliminary motion that was preactiviation of the lower limbs muscles in the before foot contact and due to the quick action in take off of the first half
GROUND REACTION FORCE OF THE FIRST TRANSITION DURING ACCELERATED SPRINTING: A PILOT STUDY
Get PDFThis study aimed to show changes in step-to-step ground reaction forces around the first transition during maximal accelerated sprinting with a typical sprinter. One male sprinter performed five 60-m maximal accelerated sprints, during which ground reaction forces through 50 m were recorded with 54 force platforms. There were sudden shifts of values for step frequency, support time, vertical impulse and braking and propulsive mean forces at around the 5th step as the first sprint transition. These sudden shift of variables support the concept of sprint transition during acceleration phase. The findings of this study would be interesting for the future study of locomotor control and practically useful for considering the strategy of accelerated sprinting
GENDER EFFECTS ON LIMB DOMINANCE IN KICKING BIOMECHANICS IN ELITE SOCCER PLAYERS
Get PDFThe objective of this study was to study the effect of gender on the limb dominance in kicking in soccer players. Forty-five players (twenty-six females and nineteen males) belonging to elite soccer teams volunteered to take part in the study. They performed 5 instep soccer kicks with either limb into a target 7m away. Female soccer players h d a lesser flexed knee at ball impact in the non-dominant limb which contributed to lower ball velocities in the toe and subsequently in the ball. Both gen&rs had a shorter backswing with the non-dominant limb, but this difference was made up in the follow through for males and in the subsequent phases for females. Working on bilateral symmetry and coordination would help improve kicking with the non-dominant limb, especially in females
SHOULD ATHLETES USE THEIR STRONGER LEG ON THE FRONT BLOCK DURING THE SPRINT START?
Get PDFThe aim of this study was to understand force production differences Men alternating feet on the starting blocks. The hypothesis was that the dynamically stronger leg should be on the front. Utilising force plates, eight male athletes performed starts alternating the front foot on the block, as well as single leg vertical countermovement jumps to test dynamic strength. In total, 121 starts were analysed. At the group level, there were no statistically significant differences in any of the force variables between dynamically stronger and weaker leg. The results raised some doubts to the theory that the stronger leg should be on the front block during the sprint start. Consequently, the advice for coaches training developing athletes is to allow athletes to use the block settings they feel comfortable with, rather than trying to overanalyse which leg should be on the front or rear block
3D KINEMATIC ANALYSIS OF THE THREE MAIN STROKES IN PADDLE TENNIS MOTOR PATTERNS
Get PDFPaddle tennis coaches are lacking of scientific support in order to devise the most effective individual training program of stroke technique. Therefore, 30 kinematics and the temporal structure of the movements of three paddle tennis strokes have been analysed. Specifically, they have been calculated spatial-temporal variables of two successful trials of three main strokes (tray-smash, Hook-smash and Exit-wall drive) performed by a world class player
EXAMINATION OF BAR VELOCITY IN BARBELL BACK SQUAT
No full textThe aim of the study was to examine repetition to repetition changes of bar velocity and its variations from barbell back squat. Participants (N=19) performed back squat with a relative intensity of 78-80% of 1 RM. Bar velocity was captured using wireless device (PUSHtm) placed on their forearm. Data were collected from 3 sets of 10 repetitions. One-way repeated measures ANOVA was used to identify the velocity changes over 10 repetitions. Statistical significance was found (F(1,17)=45.06.~ 0 . 0 0 0 1 )T.h is indicates that the bar velocity decreased significantly over the 10 repetitions. At the same time, coefficient of variance also increased as the repetitions went higher, indicating that there were differences in individual responses of bar velocity changes. Further examination will be aimed to investigate the bar velocity changes from various strength level of individuals
KINEMATICS ANALYSIS ON THE CHINESE ELITE ATHLETES TAN SIXIN\u27S BALANCE BEAM MOVEMENT OF CHANGE LEG RING LEAP
Get PDFThe purpose of this study was to obtain a series of kinematics parameters of Tan Sixin\u27s change leg ring leap with the help of software and to make kinematics analysis, in order to reveal the kinematic rules and technical characteristics of the change leg ring leap movement, thus providing theoretical basis and reference for athletes to consummate technique and coaches to guide training