PURPOSE This study aimed to identify movement pattern differences in the running of youth soccer players with and without lateral ankle sprain (LAS) histories. METHODS A total of 12 participants were recruited and assigned to the LAS group or the control group. All participants were assessed for anthropometric data, and they filled in the subjective ankle function questionnaires. Then, reflective markers were attached to their bodies, and they were instructed to run at the preferred speed on the 9-m runway thrice. 3D joint angles for ankle, knee, and hip joints were exported, and their mean values and 95% confidence intervals were calculated. Ensemble curve analysis was conducted to compare running kinematics between the groups. RESULTS The LAS group exhibited fewer dorsiflexion angles and more inversion angles compared to the control group. Excluding the dorsiflexion deficits and more inverted ankles, there were no significant differences between the groups. CONCLUSIONS Although the ankle kinematic patterns found in this paper are not considered LAS risk factors, it will be able to identify precise LAS risk factors with prospective design (e.g., lower extremity movement patterns) as well as intrinsic risk factors.
The purpose of this research is to investigate the factors affecting the performance capability of lunge movements by performing lunge movements which are commonly used as a method of instant physical movement in sports with a kinetic analysis including an EMG analysis. This research targeted 14 skilled fencers and made the subjects perform kick-lunges which allow them to go farthest from their positions and performed an analysis on such, applying a 3D motion analysis system and an EMG system. The subjects performed kick-lunges in two movements; one with a preliminary movement and the other without it and those are performed with both dominant leg and non-dominant leg. The result of this research is as follows. The lunges with a preliminary movement showed higher performance capability than those without it. Furthermore, as the level of skills gets higher, the length of lunges gets longer, and it seemed that a tactical mechanism shortening exercise performance times was used as a mechanism to control the impulse coming from such lengthened lunges. In addition, a difference appeared in mechanical factors such as moment and power in a dominant leg movement and it seemed to result from a difference in an functional capability using muscles.
[Purpose] This study aimed to examine the effects of complex physical training on exercise and football performances in youth football players. [Methods] The subjects (n=16) were randomly assigned to either a complex physical training group (CPG, n=8) or a control group (CON, n=8). CPG was performed the complex physical training for 50 minute per day, and 2∼3 times per week, for 8 weeks. Exercise performance (health related physical fitness, skill related physical fitness, Y-balance and functional movement screen; FMS) and football performance (juggling, speed dribbling, shot passing, long kick and triple hop) were measured before and after 8 weeks complex physical training. [Results] Sit-up (p=0.002), sit and reach (p=0.040), 50-m run (p=0.031), side step (p=0.005), single-leg standing with eyes closed (p=0.040), plank (p=0.023), dominant composite score (p=0.002) and non-dominant composite score (p=0.005), deep squat (p=0.009), inline lunge (p=0.042), active straight leg-raise (p=0.015), rotary stability (p=0.049), total score(p=0.001), speed dribbling (p=0.030), dominant triple hop (p=0.001) and non-dominant triple hop (p=0.032) were statistical significant interactions between group and time. [Conclusion] Our findings indicate that complex physical training has beneficial effects on performance improvement of exercise and football in youth football players.
The purpose of this research was to investigate the difference in decision making and perceived eye-focus location on peripheral vision and attacker's expertise in basketball tactical game. A total of twenty four subjects who were expert guard players (n=8), expert basketball center players (n=8), and novices (n=8), participated in this experiment. All subjects participated two tasks. The first task was to anticipate the attack direction after viewing a sequence of basketball tactic film. These films simulated three situations including offensive patterns. The three situations were consist of 3, 6, 9 degree peripheral vision. The second task was to express the level of confidence on their anticipation and to verbalize the perceived visual cues immediately after responding. For this research, an Eyelink eye movement system, an equipment for measuring anticipating, basketball tactic film were used. The variables on anticipation of attack direction were speed, accuracy, and the level of confidence. The acquiring process of advanced visual cues was examined through analyzing visual search strategies and perceived eye-focus location. In order to examine the difference in visual search, in decision making, and in perceived eye-focus locations as a function of expertise, data were analyzed through descriptive statistics, two-way ANOVA, and two-way MANOVA. This research had the following results. First, there was a significant difference on the search rate among the three groups. But, on the other hand, expert guard and center exhibited more fixations of shorter duration than the novices in the 6 and 9 degree condition. Second, results from the ratio of fixation time allotted to areas in the 3 degree condition revealed that experts spent more time fixating the ball-attacker(BA) than novices. The results from the ratio of fixation time allotted to areas in the 6 and 9 degree condition revealed that expert guard and center spent more time fixating the non-ball attacker(NBA) than novices. Expert guard also fixated longer on the pass attacker(PA) and meaning space(MS) than novices. Finally, experts paid attention to two or three locations simultaneously, whereas novices did to only one location such as the ball, attacker, defender, non-meaning space in all condition.
