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: 5

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

Time Series Approach To Athletes Motor Potential

100%
Maszczyk A., Roczniok R., Pietraszewski P., Stanula A., Zając A., Gołaś A.
Polish Journal of Sport and Tourism
|
2012
|
vol. 19
|
issue 2
103-106
EN
Introduction. The aim of this study was to determine the dynamics of changes in selected motor abilities of javelin throwers and to determine predictors of javelin throw distances. Material and methods. Research material included the results obtained from a group of 60 competitors from the Silesia Region of Poland, aged 14 - 15 years. In order to answer the research question, the following statistical analysis were employed: Pearson's linear correlation coefficients, vectors R0 and R1, time series analysis, distributed lag analysis and Almon distributed lag analysis and coefficient of concordance φ2Results. The correlation analyzes allowed for a selection of two variables for further analyses: specific strength of arms and trunk (SSAT) and specific strength of shoulders girdle and trunk (SSGT). Calculated indexes revealed that the level of SSAT showed a constant upward tendency (+15%). The highest rise in SSAT level was recorded in the 4th and 5th quarter (+9%). The level of SSGT showed an upward tendency nearly (+6%). In this case, the highest rise was observed in the 7th and 8th quarter (+4.5%). Conclusions. The standardized regression analysis revealed that the variable of specific power of arms and trunk (SOBT) is the most important predictor for javelin throw distance with a full approach run.
2
Content available remote

The Development and Prediction of Athletic Performance in Freestyle Swimming

100%
Stanula A., Maszczyk A., Roczniok R., Pietraszewski P., Ostrowski A., Zając A., Strzała M.
Journal of Human Kinetics
|
2012
|
vol. 32
97-107
EN
This paper analyses the dynamics of changes between the performances of elite freestyle swimmers recorded at particular Olympic Games. It also uses a set of chronologically ordered results to predict probable times of swimmers at the 2012 Olympic Games in London. The analysis of past performances of freestyle swimmers and their prediction have revealed a number of interesting tendencies within separately examined results of men and women. Women's results improve more dynamically compared with men's. Moreover, the difference between women's and men's results is smaller, the longer the swimming distance. As both male and female athletes tend to compete more and more vigorously within their groups, the gap between the gold medallist and the last finisher in the final is constantly decreasing, which provides significant evidence that this sport discipline continues to develop.
3
Content available remote

The Predictive Value of On-Ice Special Tests in Relation to Various Indexes of Aerobic and Anaerobic Capacity in Ice Hockey Players

100%
Roczniok R., Maszczyk A., Czuba M., Stanula A., Pietraszewski P., Gabryś T.
Human Movement
|
2012
|
vol. 13
|
issue 1
28-32
EN
Purpose. The main goal of this study was to determine the predictive value of the indexes of aerobic and anaerobic endurance in relation to specific on-ice tests performed by hockey players that focus on strength, power, speed as well as speed and strength endurance. Methods. Ice hockey players, who were members of the U20 (under 20 years of age) Polish National Ice Hockey Team, were selected from the Athletic School in Sosnowiec, Poland. Parameters that determine anaerobic and aerobic capacity were evaluated and a special physical fitness assessment was made based on a battery of ice-hockey specific tests. The degree and direction of correlations between the individual parameters of anaerobic and aerobic endurance and the special physical fitness test were calculated. Results. The obtained results found significant correlations between maximal power obtained from the Wingate test and certain aspects of the special physical fitness test, specifically the 6 × 9 turns, 6 × 9 stops and 6 × 30 m endurance tests. Significant correlations of the above-mentioned special physical fitness tests were also observed with the aerobic capacity parameter, VO2max. Conclusions. The obtained results could be considerably useful in training, as well as providing much more information on athletes which can then be suited for more personalized forms of training.
4
Content available remote

The Gluteus Medius Vs. Thigh Muscles Strength Ratio and Their Relation to Electromyography Amplitude During a Farmer’s Walk Exercise

100%
Stastny P., Lehnert M., Zaatar A., Svoboda Z., Xaverova Z., Pietraszewski P.
Journal of Human Kinetics
|
2015
|
vol. 45
|
issue 1
157-165
EN
The strength ratio between hamstrings and quadriceps (H/Q) is associated with knee injuries as well as hip abductor muscle (HAB) weakness. Sixteen resistance trained men (age, 32.5 ± 4.2 years) performed 5 s maximal isometric contractions at 75° of knee flexion/extension and 15° of hip abduction on a dynamometer. After this isometric test they performed a Farmer´s walk exercise to find out if the muscle strength ratio predicted the electromyography amplitude expressed as a percentage of maximum voluntary isometric contraction (%MVIC). The carried load represented a moderate intensity of 75% of the exercise six repetitions maximum (6RM). Electromyography data from the vastus medialis (VM), vastus lateralis (VL), biceps femoris (BF) and gluteus medius (Gmed) on each leg were collected during the procedure. The groups selected were participants with H/Q ≥ 0.5, HQ < 0.5, HAB/H ≥ 1, HAB/H < 1, HAB/Q ≥ 0.5 and HAB/Q < 0.5. One way ANOVA showed that Gmed activity was significantly greater in the group with HAB/H < 1 (42 ± 14 %MVIC) as compared to HAB/H ≥ 1 (26 ± 10 %MVIC) and HAB/Q < 0.5 (47 ± 19 %MVIC) compared to HAB/Q ≥ 0.5 (26 ± 12 %MVIC). The individuals with HAB/H < 1 were found to have greater activation of their Gmed during the Farmer’s walk exercise. Individuals with HAB/Q < 0.5 had greater activation of the Gmed. Gmed strength ratios predict the muscle involvement when a moderate amount of the external load is used. The Farmer’s walk is recommended as an exercise which can strengthen the gluteus medius, especially for individuals with a HAB/H ratio < 1 and HAB/Q < 0.5.
5
Content available remote

The Elements of Executive Attention in Top Soccer Referees and Assistant Referees

84%
Pietraszewski P., Roczniok R., Maszczyk A., Grycmann P., Roleder T., Stanula A., Fidos-Czuba O., Ponczek M.
Journal of Human Kinetics
|
2014
|
vol. 40
|
issue 1
235-243
EN
The aim of the present study was to compare executive attention of top soccer referees and assistant referees at different levels of professional attainment. The sample consisted of 53 subjects (FIFA and national level) - 30 referees and 23 assistant referees. Executive attention of assistant referees was significantly better than the referees’ (p<0.01). Furthermore, extraclass and international referees demonstrated better executive attention than the first-league referees (p<0.01). The research results have proved that referees’ executive attention differs depending on their function and professional level, as well as indicated that the quality of abilities may influence the number and correctness of decisions made during a game. This elementary cognitive process may be strongly shaped by individual’s experience and age. This finding may be instrumental in screening referees and developing criteria for recruiting future referees.
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.