Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 4

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Biomechanics of Tactics of Running a Course in Four Alpine Skiing disciplines: First Course Geometry Results

100%
Erdmann W., Aschenbrenner P.
Human Movement
|
2008
|
vol. 9
|
issue 2
124-127
EN
Purpose. The aim of the overall research on alpine skiing was examination of the biomechanical approach to tactics of running a course. The aim of this particular paper was presentation of first results on the geometry of courses of four disciplines. Basic procedures. The research covered competitions of alpine skiers during the 2006/2007 FIS World Cup. All four alpine skiing disciplines, i.e. downhill, super giant, giant slalom, and slalom, were taken into account. Each discipline was studied three times: in Italy, Austria, Germany, Slovenia, and Norway. 54 to 82 alpine skiers took part in each of the competitions. Differential GPS for geometry of gates setting and video camera for time data were used. Then the distribution of velocity for each runner along the entire course was calculated. Main findings. The first data on geometry of the ski courses revealed a large difference in vertical drop and length between the disciplines, with the angles of inclination, however, being similar. Conclusions. The knowledge of detailed geometry of ski courses is important since up to one-third of competitors do not finish particular runs. It happened that as many as ten skiers ran off the course at the same gate.
2
Content available remote

The Role of Selected Intrapsychic Factors in Alpine Skiing Instruction

81%
Makowski K., Aschenbrenner P., Krawczynski B.
Baltic Journal of Health and Physical Activity
|
2014
|
vol. 6
|
issue 2
135-141
EN
Background: This research was aimed at describing the influence of selected intrapsychic factors related to “low” and “high” mountain conditions upon the efficiency of alpine skiing instruction. Material/Methods: Research participants were 48 people without skiing skills. Altitudes from 770 to 1,741 metres above sea level were chosen for “high” groups. A STAI questionnaire was chosen in order to carry out the research. The skiing level achieved by the end of the instruction was assessed expertly with the three essential evolutions, i.e. ploughing curves, slanting slide, and half-ploughing turn, taken into consideration. Results: The anxiety level after the instruction of the “high” group exceeded that in the “low” group (p<0.0895). Significant negative correlations were observed between the mean score for technical evolutions and the accompanying anxiety in the “high” group of subjects. Conclusions: The lower the characteristic anxiety, the better the technical test results. Whenever skiing evolutions are taught, it is necessary to take into consideration both the students' anxiety levels and their physical effectiveness levels. Contributions to the awareness of skiing instruction participants can increase their mental resistance and result in a better final effect of such an instruction.
3
Content available remote

Application of the as-4 software in research on players’ kinematics on a large area in 3d coordinates as an alternative to commercial programs

81%
Aschenbrenner P., Lipińska P., Erdmann W. S.
Baltic Journal of Health and Physical Activity
|
2012
|
vol. 4
|
issue 3
172-179
EN
Background: In this work an original computer program for the video analysis of players on a large area by using a single camera is presented. Video analysis is one of the basic research techniques of human movement applied in sport. A set of cameras and special computer software is used for this purpose. Many companies provide hardware and software, but, unfortunately, their high cost and difficulty in usage are their major drawbacks. In order to simplify and reduce the costs of data analysis (obtained from a single camera), AS-4 program was developed. Material/Methods: The program includes an original algorithm which enables positioning of the camera in any place. Specifying dimensions of the playing field and an object, the program automatically calculates a scale and transfers the data to the 3D matrix. Then, using flat transformation, 3D coordinates can be determined. Results: The algorithm was tested in the field. The accuracy of determining coordinates was studied in 3 areas and errors of the method were within an acceptable range. Conclusions: With the present program, it was possible to determine the kinematic parameters at any time during the movement. The accuracy of the program was sufficient to determine the 3D position. It can be used to determine the movement path over a large area and then to calculate velocity and acceleration
4
Content available remote

An assessment of a volleyball player’s loads in a match on the basis of the number and height of jumps measured in real-time conditions

81%
Wnorowski K., Aschenbrenner P., Skrobecki J., Stech M.
|
EN
Background: The value of volleyball players’ reach is often critical to their efficient functioning in the game. It depends on the jumping ability factor and the player’s body build. An analysis of this parameter is particularly difficult to carry out in real conditions of the game. The objective of the research was to determine the height of reach in basic technical and tactical actions of leading Polish volleyball players during a match in regard to their maximum values measured in laboratory conditions. Material/Methods: The study involved five volleyball players, Polish representatives of different specialization in the game: the attacker, the setter, the middle blocker and two receivers. The study made use of a camcorder and an innovative computer program AS-4, which enables measuring the value of reach at which tactical and technical actions are carried out in the game. Results: A total of 378 tactical and technical actions of the tested players were registered. It turned out that they were performed at the level of (reach) 87.4% in comparison to the maximum reach measured in laboratory conditions. Conclusions: Values of reach achieved by the tested volleyball players have a significant, positive correlation with results obtained in individual sets. The values closest to the value of the maximum reach were reported in attack, the lowest ones in setting.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.