其自身的规律和特点。0兰台世界Lantai World30G275     

I 《新闻与写作》2004,(4)

;14;II144_14;谢英姿00070015000528影响高校档案利用的制约因素李洪喜,张海燕福建泉州黎明大学 ,福建泉州黎明大学 档案价值是通过向利用者提供服务,使之转化为社会效益和经济效益来实现的。档案最终必须和利用者打  相似文献   

How European and U.S. genetic engineering scientists view the impact of public attention on their field: a comparison     

Rabino I 《Science, technology & human values》1994,19(1):23-46

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Anaerobic capacity, isometric endurance, and Laser sailing performance     

Vangelakoudi A  Vogiatzis I  Geladas N 《Journal of sports sciences》2007,25(10):1095-1100

Laser sailors have to tolerate fatiguing contractions of the lower-body muscles for prolonged periods. The aims of the present study were (1) to evaluate the difference between top-ranked and club sailors, in their capacity to resist fatigue during sustained isometric and maximal power exercise, and (2) to examine the relationships between the above parameters and performance on a Laser simulator and competitive racing performance according to the national ranking list. Eight Greek nationally ranked Laser sailors were compared with eight club sailors. Each sailor performed: (a) an effort to the limit of tolerance on the Laser simulator, (b) an effort to the limit of tolerance of isometric endurance for the right leg on an isokinetic dynamometer, and (c) a Wingate test of maximal lower-body anaerobic power on a cycle ergometer. In the nationally ranked sailors, isometric endurance time (mean 160 s, s = 50) and endurance time on the Laser simulator (1381 s, s = 1354) were significantly (P < 0.05) longer than in the club sailors (101 s, s = 29 and 565 s, s = 367, respectively), whereas the final minute heart rate (in both groups: 149 beats . min(-1), s = 22) and the mean arterial pressure (nationally ranked sailors: 129 mmHg, s = 16; club sailors: 120 mmHg, s = 21) on the Laser simulator were not different between groups. During the Wingate test, the nationally ranked sailors had a significantly lower index of fatigue (42%, s = 5) than the club sailors (49%, s = 6). Isometric endurance time was significantly correlated with the Wingate index of fatigue (r = -0.73; P < 0.001). The nationally ranked sailors' mean and maximal anaerobic powers were significantly correlated with their national ranking positions (r = -0.83 and -0.71, respectively). It is suggested that isometric endurance and anaerobic power are well-developed in Laser class sailors and may influence their sailing performance. Furthermore, compared with club sailors, the nationally ranked sailors are able to sustain the same intensity of lower-limb isometric contractions for much longer with similar cardiovascular responses.  相似文献   

Physiological determinants of climbing-specific finger endurance and sport rock climbing performance   总被引：1，自引：1，他引：0  

MacLeod D  Sutherland DL  Buntin L  Whitaker A  Aitchison T  Watt I  Bradley J  Grant S 《Journal of sports sciences》2007,25(12):1433-1443

The aim of the study was to examine several physiological responses to a climbing-specific task to identify determinants of endurance in sport rock climbing. Finger strength and endurance of intermediate rock climbers (n = 11) and non-climbers (n = 9) were compared using climbing-specific apparatus. After maximum voluntary contraction (MVC) trials, two isometric endurance tests were performed at 40% (s = 2.5%) MVC until volitional exhaustion (continuous contractions and intermittent contractions of 10 s, with 3 s rest between contractions). Changes in muscle blood oxygenation and muscle blood volume were recorded in the flexor digitorum superficialis using near infra-red spectroscopy. Statistical significance was set at P < 0.05. Climbers had a higher mean MVC (climbers: 485 N, s = 65; non-climbers 375 N, s = 91) (P = 0.009). The group mean endurance test times were similar. The force-time integral, used as a measure of climbing-specific endurance, was greater for climbers in the intermittent test (climbers: 51,769 N x s, s = 12,229; non-climbers: 35,325 N x s, s = 9724) but not in the continuous test (climbers: 21,043 N x s, s = 4474; non-climbers: 15,816 N x s, s = 6263). Recovery of forearm oxygenation during rest phases (intermittent test) explained 41.1% of the variability in the force-time integral. Change in total haemoglobin was significantly greater in non-climbers (continuous test) than climbers (P = 0.023--40% test timepoint, P = 0.014--60% test timepoint). Pressor responses were similar between groups and not related to the force-time integral for either test. We conclude that muscle re-oxygenation during rest phases is a predictor of endurance performance.  相似文献   

浅谈入门级玩家如何成为竞技速小“高手”     

纵横I＇Neko 《电子竞技》2009,(7):91-93

玩跑跑已经有一段时间的玩家，是不是已经不满足于和朋友们单纯地打打道具，或者是看到高手出神入化的漂移表演而蠢蠢欲动？亦或者是你还在苦苦寻觅一种能够提高自己技术的方法。今天我给大家带来自己对于跑跑竞速进阶技巧的一点心得体会，希望能够带给你一点帮助。  相似文献   

Movement and stretching imagery during flexibility training     

Vergeer I  Roberts J 《Journal of sports sciences》2006,24(2):197-208

The aim of this study was to examine the effect of movement and stretching imagery on increases in flexibility. Thirty volunteers took part in a 4 week flexibility training programme. They were randomly assigned to one of three groups: (1) movement imagery, where participants imagined moving the limb they were stretching; (2) stretching imagery, where participants imagined the physiological processes involved in stretching the muscle; and (3) control, where participants did not engage in mental imagery. Active and passive range of motion around the hip was assessed before and after the programme. Participants provided specific ratings of vividness and comfort throughout the programme. Results showed significant increases in flexibility over time, but no differences between the three groups. A significant relationship was found, however, between improved flexibility and vividness ratings in the movement imagery group. Furthermore, both imagery groups scored significantly higher than the control group on levels of comfort, with the movement imagery group also scoring significantly higher than the stretching imagery group. We conclude that the imagery had stronger psychological than physiological effects, but that there is potential for enhancing physiological effects by maximizing imagery vividness, particularly for movement imagery.  相似文献   

The impact of individual efficacy beliefs on group goal selection and group goal commitment   总被引：1，自引：0，他引：1  

Greenlees I  Graydon J  Maynard I 《Journal of sports sciences》2000,18(6):451-459

Collective efficacy research has begun to progress from simply trying to verify the relationship between collective efficacy and performance to examining the mechanisms through which collective efficacy impacts on performance. To test hypotheses concerning the impact of collective efficacy on group goal selection and commitment, 24 participants were assigned to triads (consisting of the participant and two confederates) and performed two time-trials on cycle ergometers. Before each trial, the participants were asked to select both a finishing time and position goal for their group and to indicate their commitment towards these goals. After trial 1, the participants were assigned to either a high or low collective efficacy condition and received appropriate bogus performance feedback. Analysis of variance and post-hoc tests revealed that participants in the low collective efficacy group significantly reduced both finishing time and group position goals from trial 1 to trial 2, whereas participants in the high collective efficacy group maintained their goals. These results provide support for Bandura's suggestions concerning the mechanisms through which collective efficacy impacts upon performance.  相似文献   

Cricket bowling deliveries and the discrimination ability of professional and amateur batters     

Renshaw I  Fairweather MM 《Journal of sports sciences》2000,18(12):951-957

Bowlers in cricket try to disguise their bowling action by movement pattern similarity. The batter's task is, therefore, to solve rapidly perceptual discrimination problems. Previous research has suggested that batters can discriminate perceptual cues that provide depth or target information. However, at present, there is a lack of applied research evidence on further perceptual cue utilization, including bowling delivery identification. This ability is required when batting against wrist-spin bowlers who may use five different types of delivery. In the present study, we assessed this perceptual discrimination ability among three distinct standards of batters. In addition, the relative potency of body action and ball flight information was assessed by visual occlusion techniques. We found that more expert batters in general showed greater perceptual discrimination skills when faced with different ball types. However, this discrimination ability was linked specifically to delivery type and to previous experience. We also found that additional ball flight information provided no more advantage to this discrimination ability. This finding reinforces the importance of advanced cue information and the need to expose cricket batters to different bowling actions. Further study of the development of movement pattern recognition is recommended.  相似文献   

Analysis of passing sequences, shots and goals in soccer     

Hughes M  Franks I 《Journal of sports sciences》2005,23(5):509-514

Early research into how goals were scored in association football (Reep and Benjamin, 1968) may have shaped the tactics of British football. Most coaches have been affected, to a greater or lesser extent, by the tactics referred to as the "long-ball game" or "direct play", which was a tactic employed as a consequence of this research. Data from these studies, published in the late 1960s, have been reconfirmed by analyses of different FIFA World Cup tournaments by several different research groups. In the present study, the number of passes that led to goals scored in two FIFA World Cup finals were analysed. The results conform to that of previous research, but when these data were normalized with respect to the frequency of the respective lengths of passing sequences, there were more goals scored from longer passing sequences than from shorter passing sequences. Teams produced significantly more shots per possession for these longer passing sequences, but the strike ratio of goals from shots is better for "direct play" than for "possession play". Finally, an analysis of the shooting data for successful and unsuccessful teams for different lengths of passing sequences in the 1990 FIFA World Cup finals indicated that, for successful teams, longer passing sequences produced more goals per possession than shorter passing sequences. For unsuccessful teams, neither tactic had a clear advantage. It was further concluded that the original work of Reep and Benjamin (1968), although a key landmark in football analysis, led only to a partial understanding of the phenomenon that was investigated.  相似文献   

Searching a biomedical bibliographic database from Hungary--the 'Magyar Orvosi Bibliográfia'     

Kele I  Bereczki D  Furtado V  Wright J  Adams CE 《Health information and libraries journal》2005,22(4):293-295

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