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  • 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.
11

BIOMECHANICAL ANALYSIS OF FOOT CONTACT IN JUNIOR SPRINTERS

Hugo, Elmie 04 October 2011 (has links)
The purpose of this study was to determine the effects of different foot types (normal, flat and high arch) with regards to speed, roll-over and impact forces, thus attempting to indicate if a specific foot type is dominant amongst sprinters. The different foot types of ten junior sprint athletes and ten nonsprinters were determined by walking over a pressure platform (RSscan Internationalâs Footscan® 7.x plate system). The effects of foot roll-over and peak pressures during sprinting were determined for left and right feet respectively. The subjects ran barefoot at their top speed (sprinted) over 20 meters, crossing a pressure platform (RSscan Internationalâs Footscan® 7.x plate system) comprising the last two meters of the 20 meter distance. The initial contact, final contact, time to peak pressure and the duration of contact of the different sub-areas of the foot were measured. The results of the sprintersâ trials were averaged and compared to the non-sprintersâ averaged trials by performing a statistical T-test. The control group (non-sprinters) dominantly has a high arch foot type for both feet. In the sprinter group, the different foot types are all represented almost equally with regards to right feet, whereas the left feet are dominantly normal type, followed by high arch and then flat foot types. There was a significant difference (p < 0.05) during the Foot flat phase (FFP) between the sprinter group (mean left: 4.04ms, mean right: 4.34ms) and control group (mean left: 26.40ms, mean right: 24.46ms), left: p=0.007; right: p=0.022. This indicates that the FFP time is significantly faster for the sprinter group than for the control group. The control group spent a higher percentage of time on the rear foot than the sprinters did (left: p=0.0057, right: p=0.0268). The control groupâs peak plantar pressures were predominantly on the sub-areas of the heel (mean:HL=Left: 327.69, right: 351.44; mean HM= Left: 434.08, right: 423.19) and M1, M2, M3, whereas the sprintersâ peak plantar pressures are predominantly on the subareas of the M1, M2, M3, mid-foot and T1, meaning that sprinters predominantly have peak pressures on forefoot contact whereas the nonsprinters predominantly have peak pressures on heel contact. The results of this study therefore indicate that in general, sprinters dominantly have a normal foot type whereas the non-sprinters have a high arch foot type, and sprinters predominantly have peak pressures on forefoot contact whereas the non-sprinters predominantly have peak pressures on heel contact during sprints.
12

STRETCHING TECHNIQUES ON HAMSTRING FLEXIBILITY IN FEMALE ADOLESCENTS

Janse van Rensburg, Lizl 17 October 2011 (has links)
This study compared the eflicacy of 4 ditlerent hamstring-stretching techniques. Flexibility can be achieved by a variety of stretching techniques, yet little research has been performed on the most effective method. The four most basic stretches includes: Static stretching where the limb is held stationary at and endpoint for a certain time period; Dynamic stretching, an active stretch where the limb is slowly moved from the neutral position to the endpoint; PNF hold-relax- and PNF contract-relax stretching which is also referred to as active stretches because of the concentric and isometric contractions throughout the stretch (Prentice) 2010: Ill). This studyâs aim was to determine which type of stretching technique IS most effective in improving hamstring length. One hundred female subjects between the ages of 13 and 17 years were enrolled in the study. The 90°/90° hamstring length measure was used for all measurements to measure knee extension angle. Alii 00 subjects were included in a randomized controlled trial of 5 different groups comparing different hamstring-stretching techniques. Outcorne measure (hamstring length) was recorded on all subjects initially, at 3 weeks and at 6 weeks. After 3 weeks of stretching, there was a statistically significant improvement in hamstring length (p<O.OOOl) using all stretches when compared to the control group. From weeks 3 through 6, hamstring length for all groups again showed statistically significant improvement when cOlnpared to the control group. No significant ditlerence was found comparing the intervention groups after 3 'weeks or after 6 weeks of stretching. After both 3 weeks and 6 weeks of stretching the straight-leg-raise (static stretching) group had the greatest improvelnent 111 hamstring length, although the difference was not statistically significant.
13

STUDENT REFLECTIONS ON THE ATTAINMENT OF COMPETENCIES IN A COMMUNITY SERVICE-LEARNING MODULE IN HUMAN MOVEMENT SCIENCE

Coetzee, Brenda Audrey 17 October 2011 (has links)
The mission of the University of the Free State (UFS, 2010) is the pursuit of scholarship as embodied in the creation, integration, application and transmission of knowledge. This pursuit is acknowledged by promoting, among other things, community service and the development of the total student as part of the Universityâs academic culture. One of the reasons for having students participate in community service-learning (CSL) modules is that these modules address two components of the Universityâs mission: community service and the development of the total student. This links with the required transformation stipulated in the White Paper on the Transformation of Higher Education of 1997 (SA, 1997: 7â8). Many claims have been made as to the benefits students derive from participation in CSL modules (Astin & Sax, 1998; Bringle & Hatcher, 1996; Furco, 2002). These benefits can be divided into personal, interpersonal, academic and social benefits. Personal benefits include self-efficacy, self-knowledge, personal development (Simons & Cleary, 2006) as well as improved leadership skills, relationship skills and the definition of personal strengths and weaknesses (Mouton & Wildschut, 2005). Interpersonal benefits include interpersonal development, problem-solving skills (Simons & Cleary, 2006), working more effectively with others (Furco, 2002), awareness of cultural differences and awareness of cultural stereotypes (Mouton & Wildschut, 2005). Academic benefits include academic development, a better appreciation of academic work (Furco, 2002), the application of theory that improves skills such as critical observation, analysis and application (Winfield, 2005), as well as an increased understanding of the theoretical aspects (Erasmus & Jaftha, 2005). Social benefits include involvement in the community (Furco, 2002) and an increased awareness of community life and challenges (Erasmus & Jaftha, 2005). The literature highlights the diverse benefits of participating in CSL modules. However, the question arises whether the benefits derived are related to the competencies required by a person entering the recreation industry. The purpose of the study was to determine which competencies, if any, as seen from the studentsâ perspective, increased by participating in the CSL module offered by the Department of Exercise and Sports Sciences at the University of the Free State. The research was undertaken from a phenomenological viewpoint. Through a literature and job analysis study the competencies required in the recreation industry were identified. It was then determined what competencies students thought they would be able to gain by doing the module. Then the competencies that students perceived to have gained during the CSL module were obtained through student reflections. This data was then compared to the literature and job analysis information to determine how the perceived competencies gained by students through the CSL module relate to the competencies needed by a recreation specialist. Multimethod strategies of data collection were used. A literature study and a web search were undertaken to determine the required competencies. The nominal group technique (NGT) was used to determine studentsâ perceptions of competencies required. Structured and unstructured reflection and the NGT of interviewing were employed to determine the perceived gain of competencies. With regard to the competencies identified (through literature, job descriptions and student perceptions) that would be required in the recreation industry, results showed that students did indeed feel that their competencies increased. Four main themes were identified: communication, management skills, group dynamics and cultural diversity and self-evaluation. The findings indicate that CSL should be considered by lecturers in recreation as a pedagogical tool to impart competencies that are difficult, if not impossible, to teach to students in the normal classroom setup. When selecting CSL as an educational mode during the planning and conceptualisation of the module, it should be ensured that the module is designed in such a way that it imparts specific competencies that are required in the recreation industry.
14

DIE EPIDEMIOLOGIE VAN BESERINGS BY SUIDAFRIKAANSE NETBALSPELERS

Langeveld, Emile 17 October 2011 (has links)
Netball is a sport that places high physical demands on players. Quick acceleration, changing of direction, high jumps to receive a ball or to intercept an opponentâs pass is some of the tasks that players are required to perform. These requirements leave the players vulnerable to injury. From international studies it is clear that netball players have an increased risk to sustain injuries to the lower limbs. The ankle is the joint most likely to be effected. Injuries to the ankle can account for more than 80% of all netball injuries. The ligaments are the most commonly injured structures. Due to a lack of literature on injuries in South-African netball players, injury patterns in South-Africa cannot be compared to international trends. Epidemiological studies provide the proof on which risks for specific sporting codes are assessed as well as the success of therapeutic intervention programs. The aim of the study was therefore to assess the incidence and severity of injuries in a cohort of elite South-African netball players. The subjects were all the players (n = 1280) that participated in three elite netball tournaments during the 2009 season. The medical staff of each team completed a questionnaire for each player that sustained an injury during the three tournaments. The completed questionnaires were collected at the adjournment of each days play. For those players whose teams did not have their own medical officer, completed questionnaires were collected from the First Aid station where the players received medical attention. Most injuries occurred to the ankle joint (36%) followed by the knee (18%) and injuries to the fingers, hand and wrist (15%). There was a high total injury rate of 500.7 injuries per 1000 playing hours, but the severity of injuries were low, with the majority of the participants being able to continue play or being available for the next match. In order to reduce the amount of injuries to the lower extremities it is recommended that netball players follow a structured program aimed to enhance proprioception and optimize biomechanical execution of functional movement patterns. These exercises should not only be done as part of the pre-season program but continued throughout the remainder of the season.
15

Soccer : physical characteristics, physical demands of match-play and effective physical conditioning

Bloomfield, Jonathan R. January 2005 (has links)
The overall purpose of this thesis was to examine the physical aspects of high performance soccer. As such, four interrelated studies were designed to pursue this purpose. Each study was designed to overcome certain distinct methodological limitations of previous science and football (soccer) research and build upon existing research. The research designs for each of the four studies were methodologically different and progressed from previous research design incorporating data collected and analysed from text and internet sources, computerised video-analysis of interactive televised material and combined performance and laboratory assessments. In the following section the purpose of each study included in this thesis is provided and the rationale underpinning the selection of each research design is explained. Study 1: Analysis of Age, Stature, Body Mass, BNH and Quality of Elite Soccer Players from four European Leagues For many sports, there are specific physical characteristics that indicate suitability for, or potential to compete in that sport at the highest level. Various anthropometric characteristics of athletes have been shown to be reasonable predictors for participation at the highest level in sports such as swimming (Ackland et al., 1993), basketball, rugby league and American football (Norton and Olds, 2000). Surprisingly, there is no research available exploring these characteristics in soccer, particularly within the elite European soccer. It might well be that the recent changes in demands in soccer( Williams et al., 1999) PhD Thesis 6 Jonathan R- Bloomfield have been accompanied by physical characteristic changes in soccer players that have been of greater magnitude than that of the normal population. This is an important issue because even small changes in these physical characteristics of players could result in a large reduction in the pool of people to draw from in the general population who have the suitable physical characteristics to be successful in soccer (Olds, 2001). Furthermore, the comparison of players in different leagues and in different positions might provide some valuable information regarding the different demands placed on soccer players in different leagues (Reilly et al, 2000a; Rienzi et al, 2000; Strudwick et al., 2002). It is well documented that different positions in soccer constitute various different demands. Such findings suggest heterogeneity in physical characteristics that might be important for success in particular positions in soccer (Strudwick et al., 2002). The first aim of the present study was to investigate whether there are physical differences (age, stature, body mass, body mass index) between players in different positions in four European soccer leagues. This will also provide information into the diversity in playing style as well as the variation in what is being valued in soccer players in the various countries. This results in valuable information for the adaptation of different physical conditioning regimes as well as implications for talent identification (Fisher and Dean, 1998). The second aim of the present study was to assess the quality of the players of each of the four European leagues by surveying their international status, nationality and FIFA world ranking as well as participation in the FIFA World Cup 2002. This will offer information regarding the actual quality of international players within these leagues which, in turn, provides information about which league would be of the highest quality, differences in playing style and player selection. As the four leading European leagues were selected for analysis, the results provide beneficial information concerning the current status and possible future development of European soccer. Study 2: The 'Bloomfield Movement Classification': Motion Analysis of Individual Soccer Players In close relation with the investigation of the physical characteristics of elite level players, it was also aimed to identify the physical demands of performance. Computerised video-analysis was selected as the most appropriate platform to incorporate a study using the time-motion analysis methodology. This involves the notation of various subjectively or objectively chosen modes of motion which are digitally timed throughout the performance. To date, fewer than 8 modes of motion have often been chosen in time-motion investigation in soccer which arguably does not provide a sufficient degree of specificity to detail the physical demands. A high element of performance specificity must be established to elicit a high degree of transfer from competition into a training regime to optimise competitive performance (Henry, 1968; Barnett et al., 1973; Sale and MacDougall, 1981; Rosenbaum, 1987; Morrissey et al., 1995; Hill et al., 1998). The present study outlined a new approach to time-motion analysis through a method involving a greater depth of detail concerning modes of timed-motion, as well as other non-timed movements, directions, intensities, turning and 'On the Ball' categories. The aim of this study was to present a new methodology and establish reliability. The purpose was to provide a new method to perform a more detailed time-motion analysis study in soccer performance to be used in the third study of this thesis. PhD Thesis 8 Jonathan R. Bloomfield Study 3: Physical Demands of Outfield Positions in FA Premier League Soccer. To elicit an enhancement in soccer performance, it is considered important to analyse the physical demands of match-play (Reilly and Thomas, 1976; All and Farrally, 1991a; Hughes, 2003). Time-motion analysis has been used to investigate these demands. However, many limitations exist with previous research, one of which being the range of classifications used in the collection of data- A high degree of performance specificity is desired to improve coaching practices such as physical conditioning (Barnett et al., 1973). To this end, a new time-motion analysis methodology was designed (see Study 2) and aimed at providing a new level of specificity of performance into the physical demands of high level soccer. Also, the majority of soccer-related time-motion analyses have reported macroscopically with total frequency, total duration or total distance covered providing a summary of the overall physical requirements of soccer. As soccer match-play is essentially an intermittent exercise (Bangsbo, 1994e), it is important to progress the knowledge of the physical nature of the sport and further provide a higher level of specific detail. The aims of the present study were to provide detail regarding intermittent patterns of Purposeful Movement (PM) and Recovery (R), performed by players of three different positions (defender, midfielder and striker), to investigate the reoccurrence of bouts of PM and R within selected time phases and finally provide time-motion analysis of the PM using the BMC. PhD Study 4: Effective Conditioning for Soccer Match-Play The interaction of multiple dynamic physical activities often produces a hybrid of physiological and biomechanical stresses. Higher levels of soccer require increased levels of physical fitness through increased demands from high intensity activity (O'Donoghue et al., 2001; Strudwick and Reffly, 2001; Mohr et al., 2003). Therefore, increased ability to perform complex chains of movement skills (agility) in conjuncture with speed (both acceleration and deceleration) and quickness (overcoming inertia) are relative to high level performance (Withers et al., 1982; Bangsbo, 1992; Reilly, 1994a). This occurs through processes of motor learning and physical conditioning with the rules of specificity and overload as key underlying principles.
16

The development and implementation of a hip injury screening protocol within elite ice hockey

Wilcox, Christopher Richard James January 2015 (has links)
The primary aim of this project was to both investigate injury epidemiology and create methods to potentially reduce injuries within elite ice hockey athletes. Chapter Four assessed the injury problem within ice hockey by retrospectively collecting data from two National Collegiate Athletic Association (NCAA) division III teams across a four year period investigating the prevalence, location, severity and type of injuries sustained. Findings showed that contact injuries were more prevalent (58%) than non-contact injuries (42%), with the knee (15%), shoulder (12%) and hip (13%) being the most frequently injured locations when both contact and non-contact injuries were combined. When investigating only non- contact injuries the hip complex (hip, groin and thigh) (50%) was by far the most injured location with similar frequencies, in terms of injury severity, observed. Chapter Five analysed intrinsic risk factors of the ice hockey athlete by investigating differences of hip range of motion (ROM), strength and functional tests between ice hockey athletes, soccer athletes and control participants. Results demonstrated that ice hockey athletes had significantly weaker hip adduction (p = 0.023) and flexion in sitting (p = 0.001) strength compared to soccer athletes and less external rotation strength compared to control participants (p = 0.010). Ice hockey athletes also displayed greater strength than control participants in flexion in sitting (p = 0.005). Ice hockey athletes exhibited greater ROM in abduction (p = 0.001) than control participants and greater adduction than both soccer athletes (p = 0.003) and control participants (p = 0.004). Ice hockey athletes exhibited less hip flexion in lying (p = 0.001) and external rotation (p < 0.001) when compared to control participants. Ice hockey athletes also presented with an increased number of positive flexion, abduction and external rotation (FABER) tests compared to both soccer athletes and control participants. Chapter Six investigated the effectiveness of the newly created hip screen by comparing ice hockey athletes with and without a previous non-contact hip injury and their performance during the hip screen. Findings demonstrated that athletes who had no previous hip injury had greater internal (p = 0.004) and external rotation ROM (p = 0.022) on the dominant (Dom) limb and greater flexion in sitting (p = 0.031) and internal rotation ROM (p = 0.050) on the non-dominant (Ndom) limb. Although non-significant, previously injured athletes also displayed less ROM in all hip movements compared to previously uninjured athletes. Similar trends were found in strength measures with previously uninjured athletes showing significantly stronger abduction (p = 0.012) on the Dom limb and flexion in lying on both the Dom (p = 0.008) and Ndom limb (p < 0.001). Previously injured athletes displayed more positive FABER (Dom; 13% vs. 0%, Ndom; 13% vs. 5%), Trendelenburg (Dom; 75% vs. 58%, Ndom; 50% vs. 5%) and Ober’s (Dom; 13% vs. 5%, Ndom; 75% vs. 68%) tests with higher scores on the overall screen than uninjured athletes. Chapter Seven investigated the intra and inter-tester reliability of the hip screen finding that intra-class correlation coefficients (ICC) of intra-tester reliability of the ROM (0.49), strength (0.80) and overall screen (0.76) was moderate to near perfect. Inter-tester reliability again showed very large ICCs for ROM (0.71), strength (0.77) and overall screen scores (0.81). The minimum criterion change (MCC) (3.78 points) was also found to be small for the screen score change needed to be viewed as clinically worthwhile. These findings demonstrate that the screening procedure developed is useful, reliable and repeatable when assessing the ice hockey athlete’s hip. Chapter Eight demonstrated that all participants regardless of group improved their ROM and strength measures following the intervention period. However, it was demonstrated that the ice hockey intervention (IHI) group saw a decrease in the amount of positive FABER tests following the intervention compared to ice hockey control (IHC) and intervention control (IC) group (IHI: pre 15 vs. post 6; IHC: pre 15 vs. post 14; IC: pre 10 vs. post 9). It was also demonstrated that the IHI group improved above the MCC value presented within Chapter Seven with regards to the overall hip injury screen score (pre 48 vs. post 52) indicating that ice hockey athletes who participated in the intervention programme may be at a decreased risk of sustaining a non-contact hip injury due to the intervention exercises targeting weaknesses highlighted in the hip injury screen. In summary, the current project achieved the stated aims by demonstrating that the hip complex was the most common location for injuries of a non-contact nature and the creation of a reliable and repeatable hip injury screen that allows clinicians to potentially highlight athletes considered as ‘at risk’. To complete the injury prevention sequence, future work would be necessary to track athletes who scored low on the hip injury screen over time either following the intervention or as a control to assess if they were more or less likely to sustain a non-contact hip injury. Future work should also continue to optimise the intervention strategy to further develop and enhance its effectiveness in the prevention of non-contact hip injuries. This could be achieved either through a longer protocol that is incorporated into routine training or individualisation of the programme and as such provide a valuable tool for clinicians and medical teams wishing to reduce the risk of ice hockey athletes sustaining a non-contact hip injury.
17

The effects of different patterns of brisk walking on aspects of fitness, cardiovascular risk and psychological well-being

Murphy, Marie Harriet January 1999 (has links)
The use of a pattern of accumulated bouts of exercise has become enshrined in recent public health recommendations. Although there is epidemiological evidence to support this, the experimental evidence for such recommendations is limited. The four studies described in this thesis investigated the effects of different patterns of exercise on fitness, cardiovascular risk and selected psychological parameters.
18

The effect of plyometric training on the performance of cyclists

Gerstner, Ludwig 12 1900 (has links)
Thesis (MSpor)--University of Stellenbosch, 2007. / ENGLISH ABSTRACT: The purpose of this study was to determine the effect of plyometric exercise training on the aerobic and anaerobic capacities of well-trained cyclists. Twenty male competitive cyclists (age: 24 ± SD 5 years, height: 180 ± SD 6 cm and body mass: 77 ± SD 6 kg), including 12 mountain bikers and eight road cyclists were randomly divided into an experimental (n = 13) and a control group (n = 7). Testing included kinanthropometric measurements, vertical jump test, bench pull test, maximal aerobic capacity test, indoor 5-kilometer time trial (TT), anaerobic capacity test (30-second Wingate test) and an outdoor 4.4-kilometer time trial (field test). The plyometric training program had no statistically significant effect on the maximal aerobic capacity, anaerobic capacity, time trial performance (laboratory and field) and vertical jump performance of the experimental group. Selected outcome variables, i.e. VO2max, PPO and MP during the Wingate test and time to complete the laboratory TT, bordered on statistical significance. The experimental group significantly improved their upper body strength. There was also a strong correlation between the outdoor TT and upper body strength (r = 0.72). Although the plyometric training program did not significantly improve the performance of the cyclists, indications were that the experimental group improved their anaerobic power and upper body strength. One previous study in the literature suggested that the effects of a plyometric training program may only become evident a few weeks after completion of the program. It is therefore possible that the cyclists in this study would have experienced the benefits of plyometric training only later, i.e. closer to the competition season when the aim of their training program is to improve power and speed. / AFRIKAANSE OPSOMMING: Die doel van die studie was om te bepaal wat die effek van pliometriese oefeninge is op die aërobiese en anaërobiese vermoëns van goed ingeoefende fietsryers. Twintig kompeterende mans fietsryers, (ouderdom: 24 ± SD 5 jaar, lengte: 180 ± SD 6 cm en gewig: 77 ± SD 6 kg), was ewekansig ingedeel in of ‘n eksperimentele (n = 13) of ‘n kontrole groep (n = 7). Die groep sluit twaalf bergfietsryers en agt padfietsryers in. Kinantropometriese metings, vertikale spronghoogte, ‘n bolyf kragtoets (“bench pull test”), ‘n maksimale aërobiese uithouvermoë toets, ‘n binneshuise 5-kilometer tydtoets (TT), ‘n anaërobiese kapasiteit toets (30-sekonde Wingate toets) en ‘n buitemuurse 4.4-kilometer tydtoets (veldtoets) was voltooi gedurende die toetsperiode. Die pliometriese oefenprogram het geen statisties betenisvolle effek op maksimale aërobiese kapasiteit, anaërobiese kapasiteit, tydtoets prestasie (laboratorium en veld) of op vertikale spronghoogte van die eksperimentele groep gehad nie. Spesifieke uitkomsveranderlikes, soos VO2maks, piek en gemiddelde kraguitset gedurende die Wingate toets, en die tyd wat dit geneem het om die laboratorium tydtoets te voltooi, het gegrens aan ‘n statistiese betekenisvolle verbetering in die eksperimentele groep. Die eksperimentele groep het ‘n betekenisvolle verbetering getoon in hul bolyfkrag na die intervensie. Daar was ook ‘n sterk verband tussen die veld tydtoets en die bolyfkrag in die eksperimentele groep (r = 0.72). Hoewel die pliometriese oefenprogram nie die prestasie van die fietsryers betekenisvol verbeter het nie, het dit tekens van verbetering in die eksperimentele groep se anaërobiese en bolyfkrag getoon. ‘n Vorige studie het voorgestel dat ‘n pliometriese inoefeningsprogram slegs na ‘n paar weke na die intervensie ‘n effek sal toon in prestasie. Daarom is dit moontlik dat die fietsryers in die studie die voordele van pliometriese oefeninge eers later ervaar het, nader aan die kompetisiefase wanneer die doel van die oefenprogram is om spoed en krag te verbeter.
19

An analysis of the skills and tactics of wheelchair rugby

Adams, Warren Grant 03 1900 (has links)
Thesis (MScSportSc)--Stellenbosch University, 2007. / ENGLISH ABSTRACT: The purpose of this study was to determine what skills and tactics distinguish local level competition from top level competition in wheelchair rugby, through the use of games analysis. Eighteen games were filmed and analysed at three different levels of competition (local club level, regional level and international level). A five-level category set was developed to generate statistics related to successful and unsuccessful performance .. Results revealed that games play at local club and regional level in South Africa were dominated by turnovers and poor ball handling skills. Wheelchair mobility also was a factor in unsuccessful play. Basic tactical play, especially on defense, was also a major cause for concern at these levels. The difference between the South African national team and three other top international teams was not the distribution of reasons for success, but rather the frequency of success rate. South Africa was successful only 45% of the time in their performance of skills while international teams were successful 77% of the time. lt was evident in this study that the standard of play in the local club and regional level in South Africa reflects on their international performance. Ball possession is frequently lost to poor passing and poor wheelchair mobility. Turnovers are more often the result of poor passing by the opponents, rather than good defense. Successful goal inbounds and side inbounds plays are too often the result of poor defense rather than good offensive play. This study demonstrates that games analysis can be a helpful tool in determining the reasons for success and lack of success during wheelchair rugby. / AFRIKAANSE OPSOMMING: Die doel van die studie was om deur middel van die ontleding van rolstoelrugbywedstryde te bepaal watter taktieke en vaardighede in klub- en topvlakkompetisie onderskei kan word. Agtien wedstryde is op drie verskillende kompetisievlakke (klub-, streek- en internasionale vlak) verfilm en ontleed. 'n Vyfvlak kategoriestelsel is ontwerp om die suksesvlak, al dan nie, statisties in al drie kompetisievlakke aan te dui. Die resultate dui dat wedstryde op klub- en streeksvlak deur swak balhantering en verlies van balbesit (turnovers) gekenmerk word. Onvoldoende vaardigheid in rolstoelmobiliteit en tekorkominge in die taktiek van basies verdedigende spel was ook bydraende faktore. Die verskil tussen die Suid-Afrikaanse rolstoelrugbyspan en drie ander top internasionale spanne, was nie soseer verskillende oorsake vir onsuksesvolle spel nie, maar eerder die mate (hoeveelheid) sukses wat behaal is deur vaardige en taktiese spel. Die Suid-Afrikaans span was slegs 45% suksesvol in hul vaardighedsuitvoering, terwyl die internasionale spanne 'n 77% suksessyfer behaal het. Die studie dui verder aan dat die spelstandaarde wat op klub- en streeksvlak gehandhaaf word, neerslag vind in die Suid-Afrikaanse nasionale span. Hier word balbesit dikwels verloor as gevolg van swak aangee en swak rolstoelbeweeglikheid. Die verkryging van balbesit (turnovers) is meer dikwels as gevolg van swakbalhantering (aangee) deur die opponenete as goeie verdediging deur die Suid-Afrikaanse span. Suksesvolle afgooie na die aanteken van 'n doel, asook suksesvolle kant-ingooie, is eerder die resultaat van swak verdediging deur die opponente as goeie aanvallende spel. Die studie bewys dat die verfilming en ontleding van wedstryde, 'n waardevolle hulpmiddel kan wees vir bepaling van redes vir sukses, aldan nie, in rolstoelrugby.
20

Time-to-time information in interceptive tasks

Scott, Mark Alan January 1999 (has links)
No description available.

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