• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 32
  • 27
  • 22
  • 3
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 87
  • 87
  • 87
  • 24
  • 23
  • 21
  • 21
  • 13
  • 12
  • 12
  • 11
  • 11
  • 11
  • 10
  • 10
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
61

Zastoupení kompenzačních cvičení v RTC běžců na lyžích / Compensation of body burden in ATC for cross-country skiing runners in relation to their locomotor system

Suchánková, Barbora January 2014 (has links)
Diploma thesis aims to explore the representation of compensation methods and tools in ATC with representatives of Slovakia in cross - country skiing. Then obtain data on the state of theirs motor system especially the shortened muscle groups. After processing this data to compare them and create a design of supplement the compensation an individual plan. Key words: body burden, compensation, annual training cycle,locomotor system, shortened muscle groups, cross country skiing
62

Výskyt a prevence astmatu v běžeckém lyžování u mládežnických kategorií / Occurrence and Prevention of Asthma in Youth Division Cross-country Skiers

Toman, Lukáš January 2016 (has links)
Title: Occurrence and Prevention of Asthma in Youth Division Cross-country Skiers Objectives: The aim of this thesis is to determine the incidence of asthma in youth division cross-country skiers and its prevention. Methods: This thesis will comprise the method of survey and content analysis of documents. Hypotheses: No.1 Assume that asthma will have lower prevalence in youth division cross- country skiers than in adult cross-country skiers. No.2 Assume that the majority of the surveyed cross-country skiing coaches met with asthmatic symptoms in their athletes. Results: We found that 12% of youth division athletes suffer from asthma and 24% from allergies. Keywords: cross country skiing, respiratory diseases, bronchial asthma, exercise-induced asthma, allergy prevention.
63

Management sportovní akce Jizerská 50 / Sport event management: Jizerská 50

Štáhlová, Zuzana January 2016 (has links)
Title: Sport event management: Jizerská 50 Goal: The aim of the master thesis is to create proposal and suggestions for the 50th Jizerska 50 and the next upcoming event. Methods: In this thesis was used the qualitative analysis of Jizerska 50 - form of case study, participant observation, semi-structured interview and complemented by the SWOT analysis. Results: The result of master thesis is the set of proposals, which are based on the knowledge and results of Jizerska 50 in previous years and its SWOT analysis. Analysis revealed the possibility of applying new variations for the 50th Jizerska 50 and the next upcoming event. Also suggestions for project management effectiveness, sponsorship and event program. Key words: project management, cross-country skiing, organization, sport sponsorship, SWOT analysis, marketing mix.
64

Analýza tréninkového procesu Martina Jakše v letech 2010 - 2016 / Analysis of the training process Martin Jakš in the years 2010 - 2016

Franc, Jan January 2017 (has links)
Title: The training process analysis of Martin Jakš in 2010 - 2016 Objectives: The purpose of this study is to pedagogically evaluate the training process of Martin Jakš, the member of the Czech cross-country skiing team. Methods: This study is designed as a case study. The study addresses a qualitative research, which was based on an analysis of training process of an elite cross-country skier. Training indicators and sport physical examination were analyzed and assessed with regard to racer's performance in the studied term. Results: The results of this study showed a tendency to decrease of athlete's performance in the studied term. Key terms: cross-country skiing, yearlong training cycle, training indicators, sport physical examination, performance
65

Numerical optimization of pacing strategies in locomotive endurance sports

Sundström, David January 2016 (has links)
This thesis is devoted to the optimization of pacing strategies in two locomotive endurance sports; cross-country skiing and road cycling. It has been established that constant pace and variable power distributions are optimal if purely mechanical aspects of locomotion are considered in these sports. However, there is a lack of research that theoretically investigates optimal pacing for real world athletes who are constrained in their ability to generate power output through the bioenergetics of the human body. The aims of this thesis are to develop numerical pacing strategy optimization models and bioenergetic models for locomotive endurance sports and use these to assess objectives relevant in optimal pacing. These objectives include: Investigate the impact of hills, sharp course bends, ambient wind, and bioenergetic models on optimal pacing and assess the effect of optimal pacing strategies on performance. This thesis presents mathematical models for optimization of pacing strategies. These models are divided into mechanical locomotion, bioenergetic, and optimization models that are connected and programmed numerically. The locomotion and bioenergetic models in this thesis consist of differential equations and the optimization model is described by an iterative gradient-based routine. The mechanical model describes the relation between the power output generated by an athlete and his/her locomotion along a course profile, giving the finishing time. The bioenergetic model strives to mimic the human ability to generate power output. Therefore, the bioenergetic model is set to constrain the power output that is used in the mechanical locomotion model. The optimization routine strives to minimize the finishing time in the mechanical locomotion model by varying the distribution of power output along the course, still satisfying the constraints in the bioenergetic model. The studies contained within this thesis resulted in several important findings regarding the general application of pacing strategies in cross-country skiing and road cycling. It was shown that the constant pace strategy is not optimal if ambient conditions change over the course distance. However, variable power distributions were shown beneficial if they vary in parallel with course inclination and ambient winds to decrease variations in speed. Despite these power variations, speed variations were not eliminated for most variable ambient conditions. This relates to the athlete’s physiological restrictions and the effect of these are hard to predict without thorough modeling of bioenergetics and muscle fatigue. Furthermore, it vi was shown that substantial differences in optimal power distributions were attained for various bioenergetic models. It was also shown that optimal braking and power output distributions for cycling on courses that involve sharp bends consisted of three or four phases, depending on the length of the course and the position of the bends. The four phases distinguished for reasonably long courses were a steady-state power phase, a rolling phase, a braking phase, and an all-out acceleration phase. It was also shown that positive pacing strategies are optimal on relatively long courses in road cycling where the supply of carbohydrates are limited. Finally, results indicated that optimal pacing may overlook the effect of some ambient conditions in favor of other more influential, mechanical or physiological, aspects of locomotion. In summary, the results showed that athletes benefit from adapting their power output with respect not only to changing course gradients and ambient winds, but also to their own physiological and biomechanical abilities, course length, and obstacles such as course bends. The results of this thesis also showed that the computed optimal pacing strategies were more beneficial for performance than a constant power distribution. In conclusion, this thesis demonstrates the feasibility of using numerical simulation and optimization to optimize pacing strategies in cross-country skiing and road cycling. / Avhandlingen handlar om optimering av farthållningsstrategier inom längdskidåkning och landsvägscykling. Det finns ett utbrett stöd för att konstant fart och varierande effektfördelningar är optimala om endast mekaniska aspekter beaktas i dessa sporter. Ändå saknas teoretiska studier som undersöker optimal farthållning för verkliga idrottsutövare som är begränsade i sin förmåga att generera effekt genom kroppens bioenergetiska system. Målen med den här avhandlingen är att utveckla metoder för bioenergetik och optimering av farthållningsstrategier i uthållighetsidrott. Dessutom är målet att undersöka påverkan av backar, svängar, omgivande vind och bioenergetisk modellering på den optimala farthållningsstrategin samt att utreda potentialen till prestationsförbättring med optimala farthållningsstrategier. Avhandling presenterar matematiska modeller för optimering av farthållningsstrategier. Dessa modeller delas in i en mekanisk modell för förflyttning, en bioenergetisk modell och en optimeringsmodell. De mekaniska och bioenergetiska modellerna som presenteras i avhandlingen består av differentialekvation och optimeringsmodellen utgörs av en gradient-baserad algoritm. Den mekaniska modellen beskriver förhållandet mellan utövarens effekt och den resulterande rörelsen längs banan som ger tiden mellan start och mål. Den bioenergetiska modellen beskriver människokroppens olika energisystem och dess begränsningar att generera effekt. Den bioenergetiska modellen interagerar med optimeringsmodellen genom att utgöra dess begränsningar för vad den mänskliga kroppen klarar av. Sammanfattningsvis försöker optimeringsmodellen minimera tiden mellan start och mål i den mekaniska modellen genom att variera effekten längs banan. Samtidigt ser optimeringsmetoden till att denna effektfördelning inte kränker den bioenergetiska modellen. Studierna som ingår i avhandlingen resulterade i flera viktiga upptäckter om generella tillämpningar av farthållningsstrategier inom längdskidåkning och landsvägscykling. Det visade sig att konstant fart inte är optimalt om omgivande betingelser varierade längs banans sträckning. Däremot var varierande effektfördelning fördelaktig om den varierar parallellt med banlutning och omgivande vindpåverkan för att minska fartens variationer. Trots denna variation, visade resultaten att fartvariationerna inte eliminerades helt. Detta har att göra med utövarens fysiologiska begränsningar, vars påverkan är svår att förutspå utan genomgående modellering av bioenergetik relaterat till muskeltrötthet. Dessutom viii visade resultaten att olika bioenergetiska metoder gav upphov till betydande skillnader i de optimala farthållningsstrategierna. Resultaten i avhandlingen visade också att optimal effektfördelning vid kurvtagning i landsvägscykling innehåller tre eller fyra faser. The fyra faser som var utmärkande på relativt långa banor var en tröskelfas, en rullfas, en bromsfas och en maximal accelerationsfas. Resultaten visar också att positiv farthållning är optimal på relativt långa banor i landsvägscykling där tillgången på kolhydrater är begränsad. Samtidigt visade resultaten på optimala farthållningsstrategier ibland att inverkan av omgivande betingelser förbisågs till fördel för med inflytelserika betingelser som påverkar framdrivningen. Sammantaget visar resultaten i denna avhandling att utövare gagnas av att anpassa effekten med hänsyn till varierande terräng, omgivande vind, atletens egen fysiologiska och biomekaniska förmåga, banans längd och hinder såsom kurvor. Resultaten visar också att de optimala farthållningsstrategier med varierande effektfördelning som beräknats i denna avhandling förbättrar prestationen jämfört med konstanta effektfördelningar. Sammanfattningsvis visar denna avhandling på möjligheterna att använda numerisk simulering och optimering för att optimera farthållningsstrategier i längdskidåkning och landsvägscykling. / <p>Vid tidpunkten för disputationen var följande delarbeten opublicerade: delarbete 5 accepterat, delarbete 6 manuskript.</p><p>At the time of the doctoral defence the following papers were unpublished: paper 5 accepted, paper 6 manuscript.</p>
66

Form, funktion & frihet : utveckling av längdskidåkningsjackor med fokus på mönsterkonstruktion / Freedom, function & fit : development of cross country ski jackets with focus on pattern construction

Zetterberg, Anna January 2012 (has links)
Bakgrunden till denna rapport är att det sportvarumärke jag samarbetat med ville utveckla en modell av längdskidåkningsjacka som fanns i deras sortiment. Undersökningen gällde att identifiera förbättringspunkter på en dam- och herrvariant av denna jacka. Avsikten var att bevara plaggens design och genom förändringar i mönstrens konstruktion förbättra passform och rörelsefrihet, och därigenom plaggets funktion. Genom att konstruera, sy toiler och prova av dessa på provmodeller, har rörelsefrihet och passform kunnat utvärderas. Resultatet visade att viktiga punkter var raglanärmens konstruktion, böjningen av ärmen, kragens form, ärmhålsdjup och placering av skärlinjer. Det blev också tydligt att kombinationen av designerns och konstruktörens kunskaper tidigt i processen är a och o för ett lyckat resultat. En tydlig kommunikation mellan dessa parter kan minska antalet provplagg under produktutvecklingen.Ämnen som också behandlats under arbetet är gradering, produktspecificering och deras betydelse för plagg och produktion. I undersökningen har jag även tittat på möjligheter till ytterligare utveckling av jackornas funktion om designen kan förändras, till exempel genom att flytta skärningar och på så vis ändra modellens utseende.This study was made due to a sports brand wanting me to develop a style of cross country ski jacket that are currently part of their collection. The study contained identifying areas of possible improvement in both a men and women´s jacket. The mission was to keep the design of the jacket and on the same time improve the fit and ease of movement in the garment (and thereby the function). Through analysis of style samples, pattern construction, sewing of proto samples and fittings on models, the fit and ease of movement has been evaluated. The results are that important garment elements are the neck width, scye depth, construction of the raglan sleeve, the pre-bent sleeve and the placement of cut lines. A conclusion is that to reach a functional and nice looking garment, the designer and the pattern constructor need to cooperate in the product development phase. Good communication between these two departments can reduce the number of proto samples that has to be made.Pattern grading, product specifications and their impact on the style and production process are subjects that are also presented and discussed in this report. During the project I have also studied the possibilities of further development through style design changes. / Program: Designteknikerutbildningen
67

Epidemiological Studies on Long Distance Cross-Country Skiers : Participants in the Vasaloppet 1955-2010

Hållmarker, Ulf January 2015 (has links)
The overall aim of this thesis was to study the influence of physical activity on health. Risks and benefits of physical activity is of particular interest since there is a global trend of less physical activity among youths and adults. In order to investigate this aim we used a database from a large cross country ski race, Vasaloppet, with participants with a wide age range, and with both elite athletes and ordinary people who exercise and promote their health. The most serious risk of strenuous exercise is sudden death and it is challenging to identify preventive effects of major endemic diseases. Using epidemiological methodology we studied 200 000 Vasaloppet skiers and compared them with the general population. Based on personal identification numbers we added data from Swedish national personal and health registers, clinical registers as the cancer register, Swedeheart, or Swedish stroke register, and socioeconomic information from Statistics Sweden. In the Vasaloppet database we collected data on age, gender, finish time and number of races during the period 1989 to 2010. We evaluated risk of death during the race in two papers (I,II). During 90 years of annual races, cardiac arrest occurred in 20 skiers, of which five survived. The death rate is in average two per 100 000 skiers. We also studied the association with cancer incidence (paper III). The overall reduction of cancer was modest among skiers compared with the general population, but for cancers related to lifestyle the risks were markedly lower. We investigated the risk for recurrent myocardial infarction and found a 30% reduction among skiers (paper IV). In paper V we showed that skiers with a first stroke have a lower incidence of all-cause death. The skiers had a higher frequency of atrial fibrillation but had less severe stroke and no increased risk of recurrent stroke. Thus our data suggest that a lifestyle with a high level of physical activity may work as a protection after a cardiovascular event. Summary: The short excess mortality in endurance physical activity is by far outweighed by the long term protective effect of exercise in cardiovascular diseases and cancer.
68

Lietuvos slidininkų sprinterių rengimas metiniu priešolimpiniu treniruočių ciklu / Preparation of Lithuanian cross-country skiing sprinters during pre-olympic training cycle

Strolia, Mantas 09 July 2010 (has links)
XXI olimpinės žiemos žaidynės, vykusios 2010 metais Kanados Vankuverio mieste buvo jau šeštos, kuriose startavo Lietuvos sportininkai. XIX olimpinėse žiemos žaidynėse Solt Leik Sityje 2002 metais pirmą kartą į slidinėjimo lenktynių programą buvo įtrauktos sprinto lenktynės, o XX olimpinėse žiemos žaidynėse Turine buvo vykdomos individualios ir komandinės sprinto lenktynės. Vankuverio žiemos olimpinėse žaidynėse Lietuvos slidininkai pirmą kartą startavo komandinio sprinto rungtyje. Šioms sprinto rungtims Lietuvos slidininkai rengėsi specialiai, vykdydami programoje „Vankuveris-2010“ numatytus uždavinius. Vankuverio žiemos olimpinėse žaidynėse tiriamųjų slidininkų sprinterių pasiekti rezultatai sprinto distancijose buvo įvertinti patenkinamai. Tyrimo tikslas ir uždaviniai - ištirti Lietuvos didelio meistriškumo slidininkų sprinterių rengimo ypatumus metiniu priešolimpiniu ciklu, nustatyti Lietuvos slidininkų sprinterių fizinio išsivystymo, fizinių ir funkcinių galių rodiklių kaitą metiniu rengimosi ciklu, apibendrinti Lietuvos slidininkų sprinterių varžybų sezono rezultatus. Slidininkų sprinterių rengimo technologija iš esmės skiriasi nuo slidininkų rengimosi ilgesniems nuotoliams. Visgi tai reikėtų pagrįsti moksliniais tyrimais. Buvo organizuotas dviejų Lietuvos slidininkų sprinterių veiklos tyrimas. Išanalizuotas fizinis krūvis, atliktas metiniu treniruočių ciklu. Atskirų mezociklų veiksmingumui įvertinti buvo atliekami laboratoriniai tyrimai. Buvo matuojami fizinio... [toliau žr. visą tekstą] / XXI Olympic Winter Games were held in 2010 in Vancouver, Canada. That was already the sixth Games for the Lithuanian athletes. First time individual sprint was included in the cross-country skiing program in XIX Olympic Winter Games in Salt Lake City in 2002, after four years in XX Olympic Winter Games in Turin the cross-country skiing program had two sprint events: individual and team sprint. Lithuanian cross-country skiers first time took part in the team sprint event in Vancouver Winter Olympics Games. Lithuanian skiers were prepared specifically for the performance of the program "Vancouver-2010" objectives. The results of the Lithuanian skiers in individual and team sprints events in Vancouver Winter Olympics were assessed as satisfactory. The aims and objectives of research - to explore the cross-country skiing training program features of Lithuanian athletes in the last training macrocycle before Olympics, to estimate changes of physical and functional characteristics of Lithuanian cross-country skier’s sprinters physical development on preparations for the macrocycle, and summarize the results of Lithuanian skiers. Training Technology of cross-country skiers sprinters is basically different than cross-country skiers of longer distant. However, it should be based on scientific research. Sports action research of two Lithuanian cross-country skiers’ sprinters was organized. physical activity of training macrocycle were analyzed. Laboratory tests were conducted to... [to full text]
69

Wax-accessory for cross-country skiers : Development of a wax-bench that collect waste

Larsson, Emelie January 2018 (has links)
This is a master thesis report for MSc in Industrial Design Engineering at Luleå University of Technology. It is a development project where a wax-bench for cross-country skiing has been developed. The wax-bench have been developed to facilitate the clean-up for the user and to gather all wax-accessories at one place. In this report the entire project can be followed from start to finish, how the requirements were found, who is the user, what should the product handle and how was the ideas ge- nerated. The final result is a wax- box that is vacuum formed and folded in the middle. In the box there are adjustable profiles to place the ski on and an adjustable attachment part in the center that attaches to the skis binding. The box acts as a collector of the waste that is produced when waxing skis, and as storage of waxing accessories when not in use. How to install the accessory in the box is not yet determined, but the idea is to develop a specific bag that fits perfectly in the wax-box and includes all the usual accessories. This bag should then be taken out when you wax and put back in the box after complete the waxing. / I den här rapporten kan man följa ett examensarbete för civilingenjörsprogrammet Tek- nisk Design på Luleå Tekniska Universitet. Projektet består av ett utvecklingsarbete där en vallabänk för längdskidåkning har utvecklas. Vallabänken har utvecklats för att underlätta städningen för användaren och för att samla alla vallatillbehör på en och samma plats. I den här rapporten kan man följa hela projektet från start till mål, hur kraven hittades, vem är användaren, vad ska produkten klara av och hur genererades ideer. Det slutgiltiga resultatet är en valla-låda som är vakuumformad och viks ihop på mitten. I lådan finns det justerbara profiler att placera skidan på samt ett justerbart fäste i mitten som fäster i skidans bindning. Lådan fungerar som uppsamlare av skräpet som bildas när man vallar skidor och som förvaring av vallatillbehör när den inte används. Hur valla-tillbehöret ska placeras är ännu inte fastställt men tanken är att det ska utvecklas en specifik väska som passar in perfekt i valla-boxen och som har plats för alla de vanliga tillbehören. Denna väska ska sedan gå att plocka ur när man vallar och placera tillbaka i boxen efter utförd vallning.
70

Testování dyspraxie u mladých běžců na lyžích a u dětí a adolescentů rozvíjejících všestrannost / Testing of dyspraxia in young cross-country skiers and in children and adolescents developing versatility

Novotná, Eliška January 2018 (has links)
In the theoretical part, the diploma thesis summarizes the findings of developmental dyspraxia or rather developmental coordination disorder and deals with the issue of physical activities in this disorder. One section of the theoretical part are the characteristics of the activities, that probands from the practical part of this thesis regularly do, and their possible use in intervention. The practical part deals with an evaluation of motor skills in young cross-country skiers and in children from movement versatility section of Sokol union. We used the Movement Assessment Battery for Children 2 for evaluation. The next aim is to determine whether the level of motor skills correlates with the level of attention, that we tested using Test od attention d2. The last aim is to determine whether the level of motor skills is different for boys and girls engaged in the same sport. No difference in level of motor skills between cross-country skiers and children from Sokol union was found. However, statistically significant difference between performance in the single components of the test MABC-2 was revealed, this difference was found in the component of balance. The correlation between the level of motor skills and attention was not proved. Neither the difference between the level of motor skills of...

Page generated in 0.0744 seconds