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Determination of Anaerobic Threshold by a new approach through the incremental exercise using proportion in HR and Ve changes in rowers
AbstractBackground and Study Aim. The aim of this research is to create a non-invasive and easy to apply in practice approach to determine the anaerobic threshold based only on measurement of the pulmonary ventilation and the hearth rate. It uses proportions, with which these variables were changed during a maximal incremental test.
Material and Methods. Twenty athletes from the national rowing team of Bulgaria with average age of 17.5 years were tested. Participants performed a one-time graded incremental exercise test to exhaustion on a rowing ergometer. The proposed new approach for determining the anaerobic threshold is related to detecting the power. Thus, one curve (obtained from differences in percentages of hearth rate and pulmonary ventilation) crosses the other one (obtained from pulmonary ventilation in percentages). The crossing point corresponds to the anaerobic threshold. This approach was compared with two methods determining the lactate threshold, by blood lactate measurement.
Results. The Shapiro-Wilk test results indicated, that the samples of the heart rate of the compared methods have a normal or close to the normal distribution. The Fisher's F-test demonstrated, that the standard deviations of the samples do not differ significantly two by two at ɑ=0.05. The Bland&Altman test presented, that the 95% of all measurement data points lie within the confidence interval limit for each of the comparisons made between the new approach and two methods.
Conclusions. Our proposed approach is non-invasive and can be easily applied in the field conditions, without using gas-analysing devices. In addition, it is reliable, reproducible and comparable to the accepted for “Gold Standard” methods for determination of anaerobic threshold with 95% statistical significance.
Complex assessment of athletes’ operative status and its correction during competitions, based on the body impedance analysis
AbstractBackground and Study Aim. The aim of this research was assessment and correction of highly skilled swimmers’ operative status during competitions.
Material and Methods. The authors carried out complex assessment of 46 high-skilled swimmers during competition period. The body impedance analysis and functional status express diagnosis were conducted before and after competitions.
Results. The components limiting the operational state of swimmers were determined: “component composition of the body” (44.83% of the total load), “functional” (19.97%). Correlation relationships were established between the main indicators that determine the level of the operational state of athletes. The multiple regression equation was calculated, which made it possible to determine the influence of individual significant parameters on the level of the operational state of athletes and the confidence interval. A group of athletes with operational status indicators below the confidence interval received sport supplementation.
Conclusion. The main characteristics of the athletes’ operative status are cellular biomarker phase, fat free mass, extracellular water, intracellular water, strength index. These characteristics should be used in assessment of both operative status and complex functional diagnosis of highly-skilled swimmers during competitions.
The efficiency of action of futsal goalkeepers in game situations with varying results of competition
AbstractBackground and Study Aim. The aim of the study was to expand knowledge of the efficiency of actions from top-level futsal teams. Goalkeepers’ activity, effectiveness and reliability were estimated with a view to implementing the objectives of the game in offence and defence and depending on the changing match status.
Material and Methods. Data about the game were registered on a self-developed observation sheet. 23 goalkeepers participating in 31 matches of the World and the European Championships and the UEFA Futsal Cup played in the years 2012–2015 were observed.
Results. It was found that actions to gain the playfield with the ball and to prevent a loss of a goal dominated in futsal goalkeepers’ both when drawing as well as winning and losing game and that game status does not determine the style of play of the goalkeeper. Only in nine of the 60 types of actions examined significant differences in activity were fund.
Conclusions. The unequivocal claim that the current score during the competition determines the style of the futsal goalkeeper’s game (the frequency of taking actions in the game characteristic of his position), is unauthorized at this stage of research. The obtained significant differences in his activity in nine types of actions constitute only a small percentage (15%) of all his skills in the game.
Blood parameters as a measure for controlling physical performance of young Algerian cyclists (U23 category)
AbstractBackground and Study Aim. The use of blood parameters in monitoring athletes is an essential but an unstandardized component of managing athletic preparation. This study aims to describe and evaluate typical measurements and responses observed while monitoring elite cyclist during a training camp. The reported observations might contribute in constituting a scientific support for other practitioners to employ.
Material and Methods. 35 elite cyclists from the Algerian National team aged 16 – 23 years participated in this study. Peripheral fasting blood samples were collected in resting after 24 hrs of physical inactivity and outside competitions. Complete blood count (CBC) and hormonal index values (Cortisol, Testosterone, Probnp and TnT) were tested twice before and after the training camp. The statistical data were analysed by the SPSS software version 22.0.
Results. The observed rates of change were significant (p<0,01, p<0,05) for most erythrocyte variables, except for leukocyte and platelet distribution levels. Hormonal values recorded for Troponin (↓92,78%, p=0,000) and Cortisol (↓11,85%, p=0,000) remained significantly as an anticipatory response to competition. The responses of the ProBnp and testosterone were not statistically significant and experienced a different response with regards to their kinetics.
Conclusion. This study is further support suggesting a viable approach to monitoring physical performance index in elite athletes. The results imply that reducing volume while increasing intensity of training just before competition can enhance performance during short preparation periods.