共查询到20条相似文献，搜索用时 15 毫秒
1.
Abstract The aim of the present study was to determine whether changing stance width would result in a corresponding change in postural and/or pistol stability. Twelve national-standard male air pistol shooters performed 10 shots each at five stance widths (30 cm, 45 cm, 60 cm, 75 cm, and 90 cm). Postural stability was determined by measuring centre-of-pressure changes with a dual force-platform system. Shooting mechanics measures were determined by a NOPTEL ST-2000 optoelectronic training system. Medial-lateral centre-of-pressure excursion (F 4,44 = 7.17, P < 0.001, effect size = 0.99) and speed (F 4,44 = 77.03, P < 0.001, effect size = 3.88) were reduced as stance width decreased. Centre of gravity fine (the percentage of time held within an area the size of the ten-ring) improved during narrower stance widths (F 4,32 = 12.49, P < 0.001, effect size = 0.71). Our findings suggest that stance width affects postural and pistol stability in national-standard air pistol athletes. Moreover, the current method of suggesting a wider stance to improve shooting performance should be reconsidered and perhaps air-pistol shooters should use a 30-cm stance width to improve postural stability and shooting performance. 相似文献
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《European Journal of Sport Science》2013,13(5):483-489
Abstract The effects of stance angle on postural stability and shooting processes were studied using eight national-standard male air-pistol shooters. Each shooter performed 60 shots each in four stance angles (0°, 15°, 30° and 45° from the line of fire). Postural stability was determined by measuring change in centre of pressure with a dual-force platform system assessing centre-of-pressure (COP) excursion (average difference of the centre of pressure from the mean) and COP speed (total COP path divided by time). Shooting process measures were determined by using a NOPTEL ST-2000 optoelectronic system. Score was assessed with a Sius Ascor S10 electronic scoring system. The results revealed no significant difference among the various stance angles; COP excursion or COP speed, p>0.05. Results indicated a significant stance angle effect with the shooting process measure, hit fine (percentage of hold within an area the size of the 10-ring when centred over the actual shot; p = 0.025) and the shooting performance measure adjusted score (raw score adjusted for true zero; p=0.008). Moreover, best overall performance was with a stance angle of 15°. These findings suggest that stance angle may affect pistol stability and performance in air-pistol athletes. 相似文献
3.
Wen-Tzu Tang Wen-Yu Zhang Chien-Chun Huang Ming-Shing Young 《Journal of sports sciences》2013,31(14):1579-1587
Abstract A postural tremor appears whenever someone attempts to maintain a steady position against gravity. We examined the postural tremor that occurred while air pistol shooters were taking aim so as to compare the coordinative control of the shooters and to identify the features critical to successful shooting. Ten elite and ten pre-elite athletes participated in pistol shooting at 10 m, and the postural tremors in the pistol and upper limb were recorded with lightweight accelerometers. Exploratory analysis showed that the elite shooters had smaller tremor amplitudes than the pre-elite shooters in the pistol and distal arm segments. Compared with the pre-elite shooters, the elite shooters had a smaller tremor amplitude in the lateral direction relative to that in the vertical direction, together with weaker tremor coupling in the lateral direction and stronger vertical coupling of the pistol–hand complex. The resulting shot performance was inversely related to the amplitude of the tremor and to the 8–12 Hz spectral peak of the lateral tremor in the pistol–hand complex. We conclude that the postural tremors of air pistol shooters are associated with the skill of the shooters, and that the elite shooters could optimize the control of the pistol–hand complex, which strongly determined success in shooting. 相似文献
4.
A postural tremor appears whenever someone attempts to maintain a steady position against gravity. We examined the postural tremor that occurred while air pistol shooters were taking aim so as to compare the coordinative control of the shooters and to identify the features critical to successful shooting. Ten elite and ten pre-elite athletes participated in pistol shooting at 10 m, and the postural tremors in the pistol and upper limb were recorded with lightweight accelerometers. Exploratory analysis showed that the elite shooters had smaller tremor amplitudes than the pre-elite shooters in the pistol and distal arm segments. Compared with the pre-elite shooters, the elite shooters had a smaller tremor amplitude in the lateral direction relative to that in the vertical direction, together with weaker tremor coupling in the lateral direction and stronger vertical coupling of the pistol-hand complex. The resulting shot performance was inversely related to the amplitude of the tremor and to the 8-12 Hz spectral peak of the lateral tremor in the pistol-hand complex. We conclude that the postural tremors of air pistol shooters are associated with the skill of the shooters, and that the elite shooters could optimize the control of the pistol-hand complex, which strongly determined success in shooting. 相似文献
5.
Visual behaviour of pistol shooters of various levels of experience was studied using a video-oculometric technique to record the direction of gaze. A spatio-temporal analysis of the fixation patterns of subjects (five international pistol shooters and five international pentathletes) found that patterns were related to the level of skill. The pentathletes, whose level was lower, positioned their gaze on the weapon sight and visually followed the movement of the weapon towards the target. The pistol shooters appeared to use negative feedback in bringing up their weapons, so reducing the angle formed by the weapon, target and gaze. They fixed their gaze directly on the target or between the target and the weapon. Observations showed a prolonged time of attack (means = 1.107 s vs 0.558 s; P less than 0.001) and a shorter stabilization time (means = 0.714 s vs 1.216 s; P less than 0.001) for the most expert shooters. The psycho-physiological mechanisms which were the basis of these patterns and the reasons why shooters chose them are discussed. 相似文献
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Clare Elizabeth Dadswell Carl Payton Paul Holmes Adrian Burden 《Journal of sports sciences》2013,31(12):1294-1301
Abstract Despite the importance of the Combined Event to the modern pentathlon competition, little is known about performance in the event. This study aimed to (i) identify the key variables affecting Combined Event shooting performance, and the extent to which these corresponded with those identified for precision shooting and (ii) investigate the impact of changing shooting format, and whether more successful precision shooters were also more successful in the Combined Event. Seven modern pentathletes and three pistol shooters completed precision and Combined Event trials. An opto-electronic shooting system recorded score and pistol movements, whilst force platforms recorded centre of pressure movements 1 s prior to every shot. Intra-individual analysis revealed that the extent of associations between variables was participant-specific, highlighting the need for individual analysis of performance. No participants displayed matching associations between variables for precision and Combined Event shooting, emphasising the difference between performances in the two events. Both groups experienced significantly reduced scores, and increased pistol and body movements for Combined Event shooting (P < 0.05). Despite the pistol shooters’ greater precision shooting ability, no significant differences were evident between the groups’ Combined Event performances (P > 0.05). This implies that experience in one event does not guarantee success in the other, indicating the importance of event specific training. 相似文献
7.
运用美国产Noraxon表面肌电遥测系统对国家射击队男子手枪慢射运动员、河北省队运动员和业余运动员进行测试.结果表明:用贡献率和振幅变化率评价男子手枪慢射运动员持枪臂主要肌群用力的稳定性是可行的,其中振幅变化率指标更敏感和有效;运动员持枪臂肌肉稳定性越高,成绩越好. 相似文献
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作为一名优秀手枪射击运动员,都必须从启蒙基础训练抓起,为了不断积蓄特殊人才,作为一名市级业余体校射击手枪教练员,在平时的训练教学工作中,积累了丰富的教学经验,也深感我国在射击训练的启蒙教育的匮乏,教练员往往都是专业运动员出身,理论知识不深,专业知识基本来源于运动员生涯的自身体会。在此,笔者参考国内外一些射击的理论知识,尝试将手枪射击的基础知识进行简单归纳,希望能对以后启蒙培养手枪射击运动员有一些帮助。 相似文献
10.
本文采用文献资料法、实践法,结合笔者长期在一线射击训练的教学经验,提出了青少年手枪慢射的击发动作训练的目的、要点、具体方法等,并结合训练实践进行了效果验证。结果表明,青少年有其自身的特点,针对青少年慢射射手的特点进行重点击发动作训练可以切实地提高射手的运动成绩。 相似文献
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气手枪项目是手枪项目中设计精确度要求最高的项目,对技术动作的稳定性、一致性及稳、瞄、扣的协调配合等要求比较高,使用激光瞄准测试仪,对我国优秀运动员及上海队一、二线运动员进行技术动作的稳定性的测试与分析,发现优秀运动员在进入瞄区后的稳定性方面显著高于一般运动员,具体体现在枪支稳定早、稳定时间长,并且在稳定期里枪支的晃动小. 相似文献
12.
The study investigated the coordination and variability of posture and pistol motion for skilled pistol shooters and novices in a pistol-aiming task. The participants stood on a force platform and held a pistol with the preferred arm to aim for accuracy to a target on 30 s trials. The results revealed that the amount of the centre of pressure (COP) and pistol motion was lower for the expert than novice group. The time–varying structure of COP as indexed by multiscale entropy (MSE) and detrended fluctuation analysis (DFA) was also lower for the expert than the novice group. The relative phase between the COP in the anterior–posterior (AP) and pistol in the AP and between the COP in the medial–lateral (ML) and pistol in AP was close to inphase for the both groups. However, for the novice group the coordination patterns of posture and pistol motion were more variable with the pistol motion leading the posture motion while it was lagging in the skilled group. The findings show different qualitative and quantitative dynamics in pistol-aiming as a function of skill level with postural control foundational to supporting the reduced dispersion and complexity of the skilled arm-pistol motion. 相似文献
13.
We investigated balance in 33 competitive dancers (17 females, 16 males) and 22 controls (17 females, 5 males) (age 16-27 years) on a force plate in two conditions: single task (quiet stance) and dual task (with a concurrent mental task). Balance was evaluated using centre-of-pressure shift (sway) variability, mean speed, frequency, and sample entropy. The effect of the dual task in the medio-lateral plane was comparable in both groups, decreasing sway variability (P < 0.05) and increasing mean speed (P < 0.001), frequency, and sample entropy (P < 0.001), showing that the participants effectively increased the level of automaticity. In the antero-posterior plane, the dual task also increased sway frequency and sample entropy (P < 0.01) in dancers without affecting their standing performance. In contrast, postural control in non-dancers was vulnerable to reduced cognitive investment, which adversely interfered with baseline performance. There were very high correlations between sway sample entropy and frequency in each group, plane, and task (r = 0.92-0.98, P < 0.001), indicating that both parameters may measure the same characteristic of postural control and that higher sway frequency may play an important role in protecting stability in dual tasking. The postural control of dancers and non-dancers appears to be similar, although dancing seems to facilitate the increased level of automatic control in the antero-posterior plane. 相似文献
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射击作为技心能为主的项目,在基本技术动作过硬的基础上,十分要求心理状态的稳定性,尤其是在新规则的实施后,更短的竞赛时间,特别是决赛阶段,可以说不允许队员有丝毫的精力分散。但是,作为＂单兵作战＂的运动项目,因赛程长、弹数多、发与发（或组与组）之间存在时间间隔,总会因为运动员的认知和情绪的变化波及后续比赛行为进而影响成绩的发挥。为了解决这一问题,射击运动员的心理技能训练被提上了日程。主要从有关射击运动员核心心理技能,即注意力控制训练出发,并始终贯穿心理咨询工作,探讨心理技能训练对射击运动员的作用与影响,结果显示通过一定的心理干预在一定程度上提高了射击运动员的竞技能力。 相似文献
15.
Dorota Sadowska Justyna Krzepota Andrzej Klusiewicz 《Journal of sports sciences》2019,37(16):1892-1898
The aim of the study was to evaluate the effect of maximal specific physical effort on postural balance and rifle stability in biathletes in a standing shooting position. The study included 10 junior elite biathletes. The measurements were taken with the Vicon system and AMTI force platform. Postural balance and rifle stability characteristics were determined at rest as well as 1 and 5 min post maximal specific physical effort which was performed on a ski ergometer and continued until exhaustion. Maximal physical effort exerted a significant effect on all examined postural sway and rifle sway characteristics. The duration of the post-exercise changes was longer than 5 minutes. Higher post-effort rifle sway was observed in the vertical direction than in the across the shooting line direction. Post-effort postural balance impairment in the shooting line was much greater than in the across the shooting line direction. Moreover, a strong correlation was found between postural balance and rifle stability. Maximal physical effort influenced postural balance and rifle stability during aiming. Rifle sway during aiming in a standing shooting position seems to be coordinated with the postural sway of the biathlete’s body. Thus, an increase in postural sway contributes to greater sway and lesser stability of the rifle. 相似文献
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射击运动是属于智能重于体能的项目,人脑潜能的开发在射击训练方面有着重要的作用。要在比赛中创造出好的成绩,必须开展智能竞技能力的训练。鉴此,利用脑状态调控仪对优秀射击运动员进行了脑波调控研究。测试结果表明：使用脑状态调控仪对提高优秀射击运动员心智能力（注意力和手眼协调能力）有更好的促进作用,当运动员使用仪器时,其大脑α波能有规律地与仪器同步,从而使射手提高＂入静＂与专注能力水平。 相似文献
17.
Rita Ferraz de Oliveira Raôul R. D. Oudejans Peter J. Beek 《Journal of sports sciences》2013,31(9):933-940
Abstract In this study we examined the timing of optical information pick-up in basketball jump shooting using an intermittent viewing technique. We expected shooters to prefer to look at the basket as late as possible under the shooting style used. Seven experts with a high shooting style and five experts with a low shooting style took 50 jump shots while wearing liquid-crystal glasses that opened and closed at pre-set intervals. In principle, under this constraint, the participants could control when they saw the basket by actively modulating the timing of their movements. Analyses of the phasing of the movements relative to the events defined on the glasses revealed that low-style shooters preferred to see the basket just before the ball passed their line of sight, whereas high-style shooters tended to view the basket from underneath the ball after it passed their line of sight. Thus, most shooters preferred to pick up optical information as late as possible given the adopted shooting style. We conclude that, in dynamic far aiming tasks such as basketball jump shooting, late pick-up of optical information is critical for the successful guidance of movements. 相似文献
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射击快打是指在较短时间内快速射击,完成比赛的一种射击风格。随着训练水平提高和比赛规则的改变,加大了比赛难度。因此,快打在训练比赛特别是决赛中应用的优势日渐突出。运动员能否练成稳定的快打风格,适应电子靶训练,不仅是现在射击赛事的需要,也是手枪慢射项目运动员在气手枪训练方面一直在不断探究的方向。本文通过运动员训练数据分析对比,查阅文献,结合教学实际经验,提出快打风格能促进气手枪训练水平提高与比赛发挥这一观点。 相似文献
20.
Kris Berg Richard W. Latin Thomas Baechle 《Research quarterly for exercise and sport》2013,84(4):395-401
Abstract This study investigated the timing of the trigger pull in relation to the cardiac cycle during air rifle shooting. Electrocardiogram) was recorded from 20 male nonelite rifle shooters in two separate testing sessions. The testing was conducted at an indoor shooting range using an optoelectronic shooting system. Each participant fired a shot in the standing position at a distance of 10 m from the target. The results showed that compared to random triggering, the shooters fired more often during the phase of 10–50% of the R wave-to-R wave (R-R) interval and less often during the phase of 50–90%. With regard to performance accuracy, the participants exhibited average or above average performance, when the shot occurred in the beginning (0–50%) and in the end (70–99%) of the R-R interval. The less optimal range for the triggering was located within the 50–70% phase of the R-R interval. The length of R-R interval (i.e., heart rate) did not affect the relation of shot placement within the cardiac cycle to the accuracy of shooting performance. The present results extend previous findings by showing that in air rifle shooting the optimum firing time within the cardiac cycle may be located in the systolic phase. It is argued that the systole-diastole dichotomy is not a sufficiently accurate way to investigate the effects of shot placement in the cardiac cycle. Further research is needed to examine the extent to which the relationship between the timing of triggering within the cardiac cycle and shooting performance depends a shooter's skill level. 相似文献