排序方式： 共有19条查询结果，搜索用时 31 毫秒
1.
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
2.
Spatial task solving on tablets: analysing mental and physical rotation processes of 12–13-year olds
Wetzel Stefanie Bertel Sven Montag Michael Zander Steffi 《Educational technology research and development : ETR & D》2020,68(1):363-381
Educational technology research and development - Spatial skill assessment and training are promising fields of application for tablets, as touch-based interaction can prime and support mental... 相似文献
3.
In this letter, we propose a novel three-dimensional conceptual model for an emerging service-oriented simulation paradigm. The model can be used as a guideline or an analytic means to find the potential and possible future directions of the current simulation frameworks. In particular, the model inspects the crossover between the disciplines of modeling and simulation, service-orientation, and software/systems engineering. Finally, two specific simulation frameworks are studied as examples. 相似文献
4.
5.
6.
Radoslaw Kwapiszewski Justyna Szczudlowska Karina Kwapiszewska Michal Chudy Zbigniew Brzozka 《Indian journal of clinical biochemistry : IJCB》2014,29(1):57-62
Early, accurate diagnosis of lysosomal storage disorders is a major challenge, even for trained specialists. Finding innovative, accurate diagnostic methods, and high throughput, cost-effective tools are crucial to medical progress and will contribute to improved quality of life. The goal of this work was to improve currently used protocols to determine activity of acid β-galactosidase, and discuss the possibility analysing lysosomal enzymes with microfluidic systems. A principle of the determination of β-galactosidase activity was fluorometric measurement of a deprotonated form of 4-methylumbelliferone released in the enzymatic reaction. Measurements were performed using Jurkat T cells as a source of the enzyme. We observed the temperature-dependent substrate inhibition effect and determined the substrate (4-MU-β-d-galactopyranoside) concentration which should be used to determine acid β-galactosidase activity at 37 °C (0.8 mM) and at room temperature (0.6 mM). We proved that the sample incubation time may be significantly reduced to only a few minutes. We also showed that the amount of alkaline buffer used to stop the enzymatic reaction may be minimized and even, in some cases, eliminated. The presented results show how the sensitivity of the available methods to diagnose patients suffer from gangliosidosis GM1 or Morquio B disease can be improved. The proposed method may be easily implemented with microfluidic systems, which currently are promising tools for point-of-care applications. 相似文献
7.
Teresa Zwierko Wojciech Lubiński Piotr Lesiakowski Hanna Steciuk Leszek Piasecki Justyna Krzepota 《Journal of sports sciences》2013,31(16):1519-1528
AbstractThis longitudinal study investigated visual evoked potentials (VEPs) in 11 young female volleyball players who participated in extensive training for 2 years. The control group consisted of 7 age-matched female students who were not involved in any regular sports activity. Recordings of VEPs were performed twice: baseline recording (i.e., before training began) and after 2 years of systematic, volleyball-specific athletic training. The effect of athletic training on visual signal conductivity was assessed by recording the latency of N75, P100 and N135 components of the VEPs waveform. Extensive experience with volleyball training reduced signal conductivity time through visual pathway. Specifically, the latency of P100 was reduced on average by 2.2 ms during binocular viewing. Moreover, athletes had reduced N75 latency (difference of 3.3 ms) for visual stimuli that generated greater response from peripheral retina. These results indicate that sport training can affect very early sensory processing in athletes. 相似文献
8.
9.
Justyna Kwapisz Ewa Żekanowska Joanna Jasiniewska 《Journal of Zhejiang University. Science. B》2009,10(11):791-795
Objective: Iron deficiency is a common complication in patients with polycythemia vera (PV). Hepcidin is a principal regulator of iron homeostasis. The aim of our study was to assess prohepcidin, a hepcidin precursor, and other iron status pa-rameters in the serum of PV patients. Methods: The study was performed in 60 patients (F/M 26/34) aged 38～84 (66±10) years. The control group consisted of 20 healthy volunteers, age and sex matched. The following parameters were determined in blood serum samples: prohepcidin concentration, iron content, unsaturated iron binding capacity (UIBC), total iron binding capacity (TIBC), transferrin saturation (TfS), and concentrations of ferritin and soluble transferrin receptor (sTIR). Results: All PV patients showed significantly lower levels of prohepcidin, higher levels of sTIR and TIBC compared to the control group. 40% of the patients from the study group showed concentrations of ferritin below the normal range and significantly lower levels of serum iron and TfS, and significantly higher levels of sTfR, UIBC and TIBC in comparison with the rest of the study group. In this group of patients, prohepcidin concentrations were significantly lower than those in other patients. Conclusion: The results indicate that PV patients suffer from iron metabolism disorders. The decreased serum level ofprohepcidin in PV patients may be a result of iron deficiency. 相似文献
10.
This paper develops a people-centric perspective on the geographical dispersion of technological renewal in the multinational corporation (MNC). We contend that a large proportion of all foreign technological advancements can be attributed to a handful of individual inventors, suggesting a blockbuster effect of subsidiary technological development. This suggests that analyses carried out at the subsidiary or firm level disguise significant yet largely unexplored variation in the technological contributions made by individual members of these foreign units. To support this proposition, the paper draws upon an original data set that comprises all of the advanced foreign subsidiaries of 21 Swedish MNCs between 1893 and 2008, and follows their patenting activity in order to document the distribution of inventive activity, both across and within individual subsidiaries. The findings at the subsidiary level show that the distribution of technological activity and contribution to the overall multinational group is significantly skewed; the paper then empirically explores the assumption that a similar distribution also applies at the level of individual inventors. The results point to a pattern whereby most inventors make only occasional and limited technological contributions and, instead, more significant numbers of new technological discoveries are attributable to a select group of exceptionally inventive individuals. In the light of the results, we suggest the fruitfulness of applying a people-centric perspective on the sources of sustained competitive advantage of the MNC, the management of geographically dispersed capabilities in the multinational network, and the geographical sources of technological renewal in the MNC. 相似文献