Jan Chmura
Biographic Data
| ID | 7857154 |
|---|---|
| NAME | Jan Chmura |
| GIVEN NAMES | Jan |
| FAMILY NAME | Chmura |
| SIGNATURE | CHMURA J |
| AFFILIATIONS | Wroclaw University of Health and Sport Sciences |
| ORCID | 0000-0002-9153-7983 |
| VERIFIED | Yes |
| TOTAL WORKS | 6 |
| TOTAL CITATIONS | 0 |
| WORKS AS AUTHOR | 6 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1975 |
| LATEST PUBLICATION YEAR | 2022 |
| H-INDEX | 0 |
Lactate Threshold and Psychomotor Fatigue Threshold in Hot Conditions
The study aimed at finding relationships between lactate threshold and psychomotor fatigue threshold during incremental exercise in thermo-neutral climate conditions and conditions for the 2022 FIFA World Cup in Qatar simulated in an environmental test chamber. The study included 24 soccer players aged 21.02 ± 3.22 years old. The following procedures were performed: The incremental exercise test to mark lactate concentration—LA (mmol·l−1); Psycho…
Air Pollutants Reduce the Physical Activity of Professional Soccer Players
The aim of the study was to determine the impact of air quality-analyzed on the basis of the model of integrating three types of air pollutants (ozone, O 3 ; particulate matter, PM; nitrogen dioxide, NO 2 )-on the physical activity of soccer players. Study material consisted of 8927 individual match observations of 461 players competing in the German Bundesliga during the 2017/2018 and 2018/2019 domestic seasons. The measured indices included pla…
Players’ Physical Performance Decreased After Two-Thirds of the Season
The study aimed to: (1) investigate physical and technical performance among players during six consecutive phases of a competitive season, (2) determine if levels of match running and technical performance between the 1st and 6th phases of a season can be maintained, (3) and determine which phase features the lowest and highest values for variables assessed. Seventy out of 556 outfield players who played at least 80% of the matches in each phase…
Endocrine Responses to Various 1 × 1 Small-Sided Games in Youth Soccer Players
The aim of this study was to determine relationships between repeated 1 × 1 small-sided games (SSGs) (variable duration, constant work-to-rest ratio) and the concentration of steroid hormones and characteristic fatigue markers in youth soccer players. Eighteen young male soccer players were assigned at random to two experimental groups: E1-undertaking a six 30 s one-on-one SSGs with a 2 min rest period; and E2-playing six 45 s SSGs with a 3 min r…
What Frequency of Technical Activity Is Needed to Improve Results? New Approach to Analysis of Match Status in Professional Soccer
The aim of the research detailed here has been to assess the frequency with which football players engage in technical activity of various different types, in relation to seven phases of a game associated with changes in match status. To this end, 2016-2017 domestic-season matches in Germany's Bundesliga were analyzed, the relevant data being retrieved using an Opta Sportsdata Company system. Technical activity taken into consideration included s…
Repeatability of Principal Components in Samples
The asymptotic theory of the distribution of the latent roots and vector of principal components analysis (PCA) of samples has hitherto been tied t multivariate normal (MVN) distributions. However, much real behavior dat are not normal. The results of the present study show, using arguments base on Monte Carlo methods, that if there is enough meaningful structure in th population, then PCA of samples of data with multivariate non-normal (NN distr…
No prominent works on this page.
Repeatability of Principal Components in Samples
The asymptotic theory of the distribution of the latent roots and vector of principal components analysis (PCA) of samples has hitherto been tied t multivariate normal (MVN) distributions. However, much real behavior dat are not normal. The results of the present study show, using arguments base on Monte Carlo methods, that if there is enough meaningful structure in th population, then PCA of samples of data with multivariate non-normal (NN distr…
Players’ Physical Performance Decreased After Two-Thirds of the Season
The study aimed to: (1) investigate physical and technical performance among players during six consecutive phases of a competitive season, (2) determine if levels of match running and technical performance between the 1st and 6th phases of a season can be maintained, (3) and determine which phase features the lowest and highest values for variables assessed. Seventy out of 556 outfield players who played at least 80% of the matches in each phase…
Endocrine Responses to Various 1 × 1 Small-Sided Games in Youth Soccer Players
The aim of this study was to determine relationships between repeated 1 × 1 small-sided games (SSGs) (variable duration, constant work-to-rest ratio) and the concentration of steroid hormones and characteristic fatigue markers in youth soccer players. Eighteen young male soccer players were assigned at random to two experimental groups: E1-undertaking a six 30 s one-on-one SSGs with a 2 min rest period; and E2-playing six 45 s SSGs with a 3 min r…
What Frequency of Technical Activity Is Needed to Improve Results? New Approach to Analysis of Match Status in Professional Soccer
The aim of the research detailed here has been to assess the frequency with which football players engage in technical activity of various different types, in relation to seven phases of a game associated with changes in match status. To this end, 2016-2017 domestic-season matches in Germany's Bundesliga were analyzed, the relevant data being retrieved using an Opta Sportsdata Company system. Technical activity taken into consideration included s…
Air Pollutants Reduce the Physical Activity of Professional Soccer Players
The aim of the study was to determine the impact of air quality-analyzed on the basis of the model of integrating three types of air pollutants (ozone, O 3 ; particulate matter, PM; nitrogen dioxide, NO 2 )-on the physical activity of soccer players. Study material consisted of 8927 individual match observations of 461 players competing in the German Bundesliga during the 2017/2018 and 2018/2019 domestic seasons. The measured indices included pla…
Lactate Threshold and Psychomotor Fatigue Threshold in Hot Conditions
The study aimed at finding relationships between lactate threshold and psychomotor fatigue threshold during incremental exercise in thermo-neutral climate conditions and conditions for the 2022 FIFA World Cup in Qatar simulated in an environmental test chamber. The study included 24 soccer players aged 21.02 ± 3.22 years old. The following procedures were performed: The incremental exercise test to mark lactate concentration—LA (mmol·l−1); Psycho…
Medicine (4 works) · Sports Performance and Training (4 works) · Geography (3 works) · Mathematics (3 works) · Meteorology (3 works) · Physical therapy (3 works) · Statistics (3 works) · Athletes (2 works) · Computer Science (2 works) · Environmental Science (2 works)