M.Phil. (Optometry) / In football, vision is one of the key performance indicators and ingredients of success (Buys, 2002) and it is not uncommon to find a player underperforming in the field of play due to poor vision. Football is the world’s most popular sport, with the Football World Cup finals attracting record estimations of world-wide television audiences in the billions (Clark, 2007). In this sport, players must perform motor skills and control their posture during their game, while using visual information to collaborate with other team members or to oppose the opponent (Paillard & Noe’, 2006). Visual attention plays an important role in football, where players must monitor the activities and positions of multiple players simultaneously (Memmert, Simons & Grimme, 2009). As pointed out by Coopoo, Moss, Fortuin, Freese and Cameron (2012), visual capabilities and skills cannot be assumed as natural attributes but must be tested and subjected to training according to need. In this study quantitative and descriptive research is conducted to assess the visual skills of football players. Inferential statistics are done on the collected data to explain the performance of the players: A battery of twelve (12) vision related procedures were performed on each of sixty three (63) football players from two academies in Gauteng Province. The procedures are divided into ‘hardware’ and ‘software’ visual skills (Ferreira, 2002). Using the existing protocols, a comparison with existing norms is made (Buys, 2002; Buys & Ferreira, 2008). In the present study a majority of the athletes performed better in the ‘hardware’ visual skills like static visual acuity, colour discrimination, stereopsis and fusion flexibility. The athletes did not fare better in other ‘hardware’ skills like contrast sensitivity and focus flexibility. Very few of the athletes were able to score ‘above average’ and better in the ‘software’ visual skills. According to Abernethy (1986), visual performance in sport is the interaction between the ‘hardware’ and ‘software’ visual systems, and it is the ‘software’ visual system that distinguishes experts from non-experts (Ferreira, 2002; Ludeke & Ferreira, 2003; Venter & Ferreira, 2004). The ‘hardware’ of the visual system can set the potential limit to visual performance 5 in sport but once deficiencies have been addressed, it is the ‘software’ skills that will separate experts from novices (Ferreira, 2003). The ability of the sport to divide families, communities and nations along support lines tells us that there is more importance attached to the game of football than we are willing to acknowledge. Attention must therefore be paid to the performance indicators (sports vision, etc.), which have on many occasions influenced the outcomes of games. The SPSS statistical package was used to test for any statistical significance in the correlations test between player age, player position on the field of play, and player years of experience against the players’ visual skills.

Several recent studies have revealed that high caliber European professional soccer players often have diminished levels of neurological functioning, yet no study has been able to identify the specific aspect of soccer participation responsible for these decreases. In an effort to identify a source of mild traumatic brain injury present in everyday participation in soccer, this study investigated whether a single bout of heading a soccer ball would have acute detrimental, measurable effects on sensorimotor and neurocognitive functioning. We hypothesized that subjects would exhibit significant changes in postural stability, memory, and concentration immediately after an acute bout of repeated heading a soccer ball. Additionally, we evaluated the protective effect(s) associated with wearing a mouthguard while performing the acute bout of heading. Twenty-eight elite level soccer players (mean age, 20.9 �� 2.5 yrs) were randomly assigned to one of three experimental groups: Headers with mouthguard (n=10), Headers with no mouthguard (n=10), and Control (n=8). Subjects in the two treatment groups performed 12 headers of soccer balls projected at 40 km/hr from an electric soccer ball-launching machine. Postural stability was evaluated using a Biodex Stability System, while memory and concentration were assessed using Wechsler Digit Span (WDS) tests (digits forward and digits backward) in a 3 x 2 factorial ANOVA design (��=0.05). There were no significant main effects or interactions among the three measures of postural stability scores in the three groups (p>0.05). The WDS Forward group means ranged from 10.4 �� 1.8 to 13.5 �� 1.2 while the WDS Backward means ranged from 6.4 �� 1.1 to 7.7 �� 3.0, but were not different among the groups (p>0.05). We concluded that a single bout of 12 soccer headers approximating the number of headers performed during a typical NCAA Division I-A soccer practice did not produce significant deficits in postural stability, memory, or concentration. While our findings are similar to several recent studies, we suggest that more sensitive measurement tools such as ImPACT neurocognitive testing and functional magnetic resonance imaging be utilized to determine the effects of acute as well as chronic exposure to headers in soccer players. / Graduation date: 2003

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

The main problem of this study was to determine if a significant strength difference existed between the mirror muscles of six muscle groups in the dominant and nondominant legs of University of the Pacific male soccer players at differing contraction speeds as measured by the Cybex II Isokinetic Dynometer.

The purpose of this project was to review anterior cruciate ligament (ACL) literature and develop a performance evaluation and injury risk assessment (PIER) for female soccer players. A strategy guide for decreasing injury risk and enhancing performance was developed in hopes to bring awareness to the athletic community about ACL injury for female soccer players.

Playing professional football is a high risk occupation. Injury rates among professional footballers are higher than those commonly found in other industries. Several Scandinavian studies have begun to document the long-term physical health problems, such as osteoarthritis (OA), that can beset ex-professional footballers. However, the experiences of ex-professional footballers playing and living in the United Kingdom (UK) have not received similar academic attention. Furthermore, no studies have investigated the impact that OA has on the quality of life of former players anywhere in the world. This thesis aimed to rectify a widespread and serious health problem among a cohort that has largely been neglected to date. In Phase I, 284 ex-professional footballers responded to a postal survey which aimed to establish the prevalence of injury and OA. In Phase II, 12 semi-structured interviews were conducted with ex-professional footballers from Phase I who had developed OA. The aim was to gain an in-depth understanding of how the condition impacted on their lives and how they coped. In Phase II, 101 ex-professional footballers, who were not involved in Phases I and II, responded to a cross-sectional postal survey, which investigated the relationships between pain, pain coping and psychological distress within the context of a stress and coping model. Career injury and surgery were common among respondents in Phase I and nearly half (49%) had subsequently developed OA in at least one joint. Pain was the most common problem for all respondents irrespective of OA diagnosis. Lack of mobility and work disability were other problems reported by respondents. Interviewees in Phase II described how they were encouraged to 'play hurt' during their career and to accept, minimise or ignore the threat of pain, injury and OA. It was some of these attributes which enabled respondents to 'live hurt' in the presence of chronic pain and disability in later life. In Phase II it was shown that psychological distress was not a serious problem for many respondents. However, several coping strategies (denial, emotional venting and upward comparison) were positively associated with pain and psychological distress, particularly for those participants in greater pain. Although OA and chronic pain are prevalent among ex-professional footballers in the UK, its impact upon psychological distress was not as great as reported in some other studies of persons which chronic disease and pain. Increased psychological distress was linked to greater pain and the use of several coping strategies (e.g. denial, emotional venting and upward comparison). However, given the cross-sectional design, it remains to be clarified whether coping predicts psychological distress or whether an increase in psychological distress precipitates more coping. Suggestions are proposed for a psychosocial intervention which would have an impact on pain coping and psychological distress among ex-professional footballers.

Thesis (MScSportSc)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: Talent identification and early selection into a professional soccer academy has been reported to be very important for the long term development of footballing expertise (Le Gall et al., 2010). This awareness of the need for early identification of gifted youngsters has led to an increased number of soccer centres of excellence and academies throughout the world. Traditionally, identification and selection of promising individuals into youth soccer academies has been linked to a coach’s subjectivity and preconceived image of the player. Once this method is used in isolation it can result in tedious misjudgements in talent identification - hence the emphasis on science-based approaches. Through soccer-specific research, a number of anthropometric and physical parameters have been linked to successful performance in soccer. The primary aims of the study were to explore the anthropometric, somatotype and functional fitness characteristics of young academy soccer in South Africa and Zimbabwe and to distinguish variables that can be relevant for Talent Identification. The study followed a quantitative non-intervention design with a sample of convenience. A total of 74 young soccer players (Age 15.9±0.81) from South African (n = 41) and Zimbabwean (n = 33) soccer academies were purposively sampled. The following anthropometric variables were measured following the International Society of the Advancement of Kinanthropometry (ISAK) protocol: body mass and height; skinfolds – (triceps, subscapular, biceps, iliac crest, supraspinale, abdominal, front thigh, medial calf); Girths – (arm relaxed, arm flexed and tensed, waist, gluteal, and calf); bone breadths – (biepicondylar humerus and biepicondylar femur). Functional fitness variables that were measured include: lower back muscle flexibility (sit and reach test), upper body flexibility (shoulder flexibility), leg power using (vertical and horizontal jumps), overhead throw (2kg medicine ball throw), speed tests (10, 20, and 40m sprint tests), agility (Illinois test) and aerobic fitness (Hoff test). There were no statistically significant differences in age, body mass, height, fat mass, body mass index, lower back flexibility, right shoulder flexibility, 20m sprint, and endurance capacity (p>0.05). Statistically significant differences were found in percentage body fat (p>0.05), sum of 8 skinfolds, fat free mass, somatotype, left shoulder flexibility, upper and lower body power, 10m and 40m sprints (p<0.01). South African players were found to have higher %BF and sum of skinfolds and then Zimbabwean players. It was concluded that Zimbabwean players performed significantly better than South Africans in agility, 10m, 40m sprints, vertical jump, horizontal jump and overhead throw and had better future chances of success in soccer. Goalkeepers were taller and heavier, while midfielders and defenders were found to be lighter and shorter. Goalkeepers were the most agile group, while forwards were the fastest group. Agility, power and speed were the most important variables that can be used during talent selection and coaches should purposefully work to develop these characteristic during training sessions. Height and weight are relevant in allocating positional roles to players and not in Talent Identification. / AFRIKAANSE OPSOMMING: Talentidentifisering en vroeë seleksie in ʼn professionele sokkerakademie blyk baie belangrik te wees vir die langtermyn ontwikkeling van sokker vaardighede (Le Gall et al., 2010). Hierdie behoefte vir die vroeë identifisering van talentvolle jong spelers het aanleiding gegee tot ʼn toename in sokker sentra van uitnemendheid en akademies wêreldwyd. Tradisioneel is die identifisering en seleksie van belowende individue vir toelating tot ʼn jeug sokker akademie aan ʼn afrigter se subjektiwiteit en voorafopgestelde idees van die speler gekoppel. Wanneer die metode in isolasie gebruik word kan dit dodelike mistastings in talent identifisering teweeg bring – daarom die klem op wetenskaplik gebaseerde benaderings. Deur sokker spesifieke navorsing is daar alreeds ʼn aantal antropometriese en fisieke parameters aan suksesvolle prestasie in sokker gekoppel. Die primêre doelwitte van die studie was om die antropometrie, somatotipe en funksionele fiksheidskenmerke van jong sokker akademie spelers in Suid-Afrika en Zimbabwe te ondersoek en om veranderlikes wat relevant vir talentidentifisering kan wees te onderskei. Die studie het ʼn kwantitatiewe, nie-intervensie ontwerp met ʼn gerieflikheidsteekproef gevolg. ʼn Totaal van 74 jong sokkerspelers van Suid-Afrika (n = 41) en Zimbabwe (n = 33) sokker akademies is doelgerig geselekteer (ouderdom 15.9 ± 0.81 jaar). Die volgende antropometriese veranderlikes is ooreenkomstig met die International Society of the Advancement of Kinanthropometry (ISAK) protokol gemeet: liggaamsmassa en -lengte; velvoue (triseps, subskapulêr, biseps, iliokristale vou, supraspinalis, abdominale, quadriseps, mediale gastroknemius); omtrekke (arm ontspanne, arm in fleksie en gespanne, middel, gluteale, en kuit); been breedtes (biepikondelêre humerus en biepikondelêre femur). Funksionele fiksheidsveranderlikes wat gemeet is was: laerug spierlenigheid (sit en reik toets), boonste ekstremiteit lenigheid (skouer lenigheid), beenkrag (vertikale en horisontale spronge), oorhoofse gooi (2kg medisyne balgooi), spoedtoets (10, 20, en 40m spoedtoetse), ratsheid (Illinois toets) en aërobiese fiksheid (Hoff toets). Geen statisties betekenisvolle verskille is in ouderdom, liggaamsmassa, -lengte, vetmassa, liggaamsmassa indeks, laerug lenigheid, regterskouer lenigheid, 20 meter spoed en uithouvermoë kapasiteit (p>0.05) tussen SA en Zimbabwe spelers gevind nie. Statisties betekenisvolle verskille is wel in persentasie liggaamsvet (p<0.05), som van agt velvoue, vetvrye massa, somatotipe, linkerskouer lenigheid, boonste en onderste ekstremiteit liggaamskrag, 10m en 40m spoed (p<0.01) gevind. Suid-Afrikaanse spelers het ʼn hoër persentasie liggaamvet en som van velvoue as die Zimbabwiese spelers gehad. Daar is tot die gevolgtrekking gekom dat Zimbabwiese spelers betekenisvol beter as Suid-Afrikaanse spelers in die meeste fiksheidstoetse gevaar het en waarskynlik beter kanse vir sukses in sokker het. Doelwagters was groter en swaarder, terwyl middelveld spelers en verdedigers ligter en korter was. Doelwagters was die ratste groep, terwyl voorspelers die vinnigste groep was. Ratsheid, krag en spoed is as die belangrikste veranderlikes geïdentifiseer wat tydens talentidentifisering gebruik kan word en afrigters moet doelbewus daaraan werk om hierdie eienskappe tydens oefensessies te ontwikkel. Lengte en gewig is relevant in die toekenning van posisionele rolle aan spelers en nie in talentidentifisering nie. Hierdie is die eerste studie waarin die antropometriese en funksionele fiksheidsprofiele van jong sokkerspelers in Suid-Afrika en Zimbabwe met mekaar vergelyk word. Dit baan die weg vir ander navorsers om hierop uit te brei deur sokkerspelers van ander lande in Afrika te toets en by te dra tot die kennis van sokkerspelers in Afrika. Hierdie navorsing skep ook die basis vir afrigters en oefenkundiges in Afrika om die bydrae wat die wetenskap maak ten opsigte van liggaamsamestelling en funksionele fiksheid beter te verstaan om talentidentifisering in sokker te verbeter.