Thesis (Ph. D.)--Michigan State University, 2004. / Includes bibliographical references (leaves 88-91). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.

Thesis (Ph. D.)--Michigan State University, 2004. / Includes bibliographical references (leaves 88-91).

Thesis (M. Sc.)--University of Hong Kong, 2005.

Thesis (Ph.D.) - University of Queensland, 2005. / Includes bibliography.

published_or_final_version / Sports Science / Master / Master of Science in Sports Science

In rowing the results are determined by the indicators of physical and functional capacity. Rower’s functional abilities are determined by a lot of factors, such as aerobic and anaerobic abilities, as well as technical, tactical, and psychological preparation (Skernevičius, 1997). Therefore, the biggest challenge in training process is to find optimal loads for each sportsman and team. Coaches and sportsmen understand that an increase in the amount of physical loads is limited, because human capacity and adaptation have their limits. The objective of the research was to explore the training process of the rowers of Olympic reserve in a yearlong period. Eight 18-21 year old rowers of Olympic reserve were tested. Preparation period of 2004-2005 season was analyzed. Tests for measuring physical development, physical and functional capacity were carried out three times. When yearlong period was analyzed, a conclusion can be drawn that physical loads of tested rowers were lower than the loads recommended by majority of researches. To conclude the testing results carried out at VPU Sport science institute and Vilnius sports medicine centre, rowers’ physical loads did not have much importance to physical development, but positively affected functional capacity of circulatory system. The indices of aerobic efficiency at critical intensity limit and at anaerobic threshold in competitive period did not reach appropriate level and was worse compared with indices measured at... [to full text]

Thesis (M.S.)--Humboldt State University, 2005. / Includes bibliographical references (leaves 37-43). Also available via Humboldt Digital Scholar.

Thesis (Ph. D.)--Michigan State University, 2002. / Includes bibliographical references (leaves 177-185).

A multidisciplinary approach for the modeling and analysis of the performance of Olympic rowing boats is presented. The goal is to establish methodologies and tools that would determine the effects of variations in applied forces and rowers motions and weights on mean surge speed and oscillatory boat motions. The coupling between the rowers motions with the hull and water forces is modeled with a system of equations. The water forces are computed using several fluid dynamic models that have different levels of accuracy and computational cost. These models include a solution of the Reynolds Averaged Navier--Stokes equations complemented by a Volume of Fluid method, a linearized 3D potential flow simulation and a 2D potential flow simulation that is based on the strip theory approximation. These results show that due to the elongated shape of the boat, the use of Sommerfeld truncation boundary condition does not yield the correct frequency dependence of the radiative coefficients. Thus, the radiative forces are not computed in the time-domain problem by means of a convolution integral, accounting for flow memory effects, but were computed assuming constant damping and added mass matrices. The results also show that accounting for memory effects significantly improves the agreement between the strip theory and the RANS predictions. Further improvements could be obtained by introducing corrections to account for longitudinal radiative forces, which are completely neglected in the strip theory. The coupled dynamical system and the multi-fidelity fluid models of the water forces were then used to perform a sensitivity analysis of boat motions to variations in rowers weights, exerted forces and cadence of motion. The sensitivity analysis is based on the polynomial chaos expansion. The coefficients of each random basis in the polynomial chaos expansion are computed using a non-intrusive strategy. Sampling, quadrature, and linear regression methods have been used to obtain the these coefficients from the outputs generated by the system at each sampling point. The results show that the linear regression method provides a very good approximation of the PCE coefficients. In addition, the number of samples needed for the expansion, does not grow exponentially with the number of varying input parameters. For this reason, this method has been selected for performing the sensitivity analysis. The sensitivity of output parameters to variations in selected input parameters of the system are obtained by taking the derivatives of the expansion with respect to each input parameter. Three test cases are considered: a light-weight female single scull, a male quad scull, and a male coxless four. For all of these cases, results that relate the effects of variations in rowers weights, amplitudes of exerted forces and cadence of rowing on mean boat speed and energy ratio, defined as the ratio of kinetic energy of the forward motion to that of the oscillatory motions, are presented. These results should be useful in the design of rowing boats as well as in the training of rowers. / Ph. D.

Tyrimo objektas – irkluotojų aerobinis pajėgumas. P. Karoblio (2003) teigimu talentingų sportininkų paieška, jų atranka ir sportinis rengimas – viena svarbiausių šiuolaikinio sporto problemų. Svarbiausia yra sudaryti palankias sąlygas siekti aukštų sportinių pasiekimų, todėl turėtų būti tinkamai projektuota sportininkų rengimo sistema: treniruočių metodika, organizavimas, kontrolė ir valdymas. Irklavime varžomasi klasikinėje 2000m distancijoje. Distancijos įveikimo trukmė nuo 5 min. 20 s iki 9 min, priklausomai nuo valčių klasės, meistriškumo ir nuo oro sąlygų. Irklavime sportinius rezultatus sąlygoja sportininkų fizinio ir funkcinio pajėgumo lygmuo. Funkcines irkluotojų galimybes ir jų realizavimą lemia daugelis jų veiksnių: organizmo aerobiniai ir anaerobiniai gebėjimai, techninis ir taktinis bei psichologinis parengtumas (Skernevičius, 1997). Kintant socialinėms, ekonominėms sąlygoms, plėtojant sportą, didėjant konkurencijai iškyla problema, kaip tobulinti Lietuvos didelio meistriškumo irkluotojų rengimą, kad jų meistriškumas pasiektų tarptautinį lygį, leistų iškovoti medalius svarbiausiose varžybose, dėl to svarbu stebėti sportininkus, atliekant fiziologinius testavimus. Tačiau mažai analizuotas Lietuvos irkluotojų rengimas metiniu ciklu, kurie ruošiasi olimpinėms žaidynėms: apie jų treniruočių fizinius krūvius, organizmo fizinių ir funkcinių galių kaitą ir raidą nėra daug informacijos. Kadangi Lietuvoje irkluotojams mažai atliekami fiziologiniai testavimai, siekiant... [toliau žr. visą tekstą] / Research object – rowers‘ aerobic capacity. P. Karoblis (2003) according to the talented athletes in the selection and preparation of sports one of the most important problems of modern sport. The key is to facilitate the achievement of high sports achievements and should be properly designed by athletes training system: training methods, organization, control and management. Rowing competed classic 2000 m distance. Superable time of distance is 5 minutes 20 seconds to 9 minutes depending on boat class, craftsmanship and the weather. Rowing sports performance athletes causes physical and functional capacity level. Rowers functional capabilities and their realization is determined by many factors: the body's aerobic and anaerobic capacity, technical and tactical and psychological maturity (Skernevičius, 1997). Changing social, economic conditions for the development of the sport increasing competition there is a problem how to improve the elite rowers of Lithuanian preparing, their mastery of reach international level, would win medals in major competitions conditions, it is important to monitor athletes during physiological stress. However, Lithuania rowers are few analyzed preparing the annual cycle of preparing for the Olympics: their physical training load, the organism physical and functional abilities change and evolution is not a lot of information. Since Lithuania rowers made few physiological stress to control and monitor the fitness of athletes, we believe, that this... [to full text]