A5048228210- Sports injuries and prevention
- Sports Performance and Training
- Sport Psychology and Performance
- Traumatic Brain Injury Research
- Shoulder Injury and Treatment
- Injury Epidemiology and Prevention
- Cardiovascular Effects of Exercise
- Sports Analytics and Performance
- Sports Dynamics and Biomechanics
- Diverse Approaches in Healthcare and Education Studies
- Social Media in Health Education
- Obesity, Physical Activity, Diet
- Motivation and Self-Concept in Sports
- Pancreatic function and diabetes
- Children's Physical and Motor Development
- Physical Activity and Health
- Physical Education and Pedagogy
- Knee injuries and reconstruction techniques
- Winter Sports Injuries and Performance
- Hypothalamic control of reproductive hormones
- Thyroid Disorders and Treatments
- Genetics and Physical Performance
- Growth Hormone and Insulin-like Growth Factors
- Regulation of Appetite and Obesity
- Sport and Mega-Event Impacts
Leeds Beckett University
2016-2025
University of Cape Town
2016-2025
Sports Science Institute of South Africa
2013-2023
U.S. National Science Foundation
2015
National Institute for Occupational Safety and Health
1997-2014
University of Pretoria
2013
Justice Research and Statistics Association
1997
University of Maryland, College Park
1997
University of Wisconsin–Madison
1984-1989
National Institute of Diabetes and Digestive and Kidney Diseases
1983-1984
The high injury rate associated with rugby union is primarily due to the tackle, and poor contact technique has been identified as a risk factor for injury. We aimed determine whether tackle proficiency scores were different in injurious tackles versus that did not result using real-match scenarios high-level youth union.Injury surveillance was conducted at under-18 Craven Week tournaments (2011-2013). Tackle-related information used identify events match video footage non-injury injured...
Objectives Assess the validity and feasibility of current instrumented mouthguards (iMGs) associated systems. Methods Phase I; four iMG systems (Biocore-Football Research Inc (FRI), HitIQ, ORB, Prevent) were compared against dummy headform laboratory criterion standards (25, 50, 75, 100 g ). II; evaluated for on-field iMG-triggered events video-verification to determine true-positives, false-positives false-negatives (20±9 player matches per iMG). III; by 18 rugby players, perceptions fit ,...
Insulin receptors from rat brain were studied for receptor-associated tyrosine kinase activity.In solubilized, lectin-purified receptor preparations, insulin stimulated the phosphorylation of fl subunit its as well exogenous substrates.Phosphoamino acid analysis casein phosphorylated by these preparations revealed that "P incorporation occurred predominantly on residues.Receptor and phosphorylations specific analogues also bind to receptor.The dose response resembled reported purified human...
Thyrotropin (TSH) responses to intravenous thyrotropin-releasing hormone (TRH) were studied in 9 men after 12 and 36-h fast separated by more than a week performed random order. The TSH, basally response TRH, was significantly lower the compared that h. mechanism for this effect is not clear, but may be related altered hormonal or fuel status associated with prolonged fasting.
The high impact and physical nature of the tackle during a rugby match places tackler(s) ball-carrier at risk injury. Injuries as result account for up to 61% all injuries that occur match. purpose this paper is to: i) review literature on injury mechanisms events associated with increased tackle; ii) identify strategies can be coached training executed by players reduce Coaches equipped better understanding thorough knowledge safe effective technique in have major role preventing or...
Abstract Tackling is an important skill for performance in rugby, yet little has been reported on tackler characteristics and its relationship to competition. The aim of this study was identify association with tackle matches. Eighteen matches the 2010 Super 14 were analysed, which amounted 2092 coded tackles. Tackler such as head position – motion , up forward type shoulder tackler, arm or ball‐carrier fend absent moderate, strong leg drive –absent usage associated outcomes. Relative risk...
In rugby union, understanding the techniques and events leading to concussions is important because of nature injury severity potential long-term consequences, particularly in junior players. Proper contact technique a prerequisite for successful participation major factor associated with injury. However, execution proper its relationship has yet be studied matches. Therefore, aim this study was compare concussion representative sample similarly matched non-injury (NI) events. Injury...
Tackle coaching forms a cornerstone of training in rugby and is designed to enhance performance mitigate tackle injury. The athlete voice can help key stakeholders understand the psychosocial determinants that shape skill development relation coaching. We aimed capture player experiences women's union.Qualitative study using grounded theory approach.Current women union players, with at least 1-year senior level experience, were recruited from Europe, Africa North America between December...
Abstract: We examined the structure of affinity‐labeled insulin receptors in rat brain, liver, and human IM‐9 lymphocytes using sodium dodecyl sulfate‐polyacrylamide gel electrophoresis. In gels run under reducing conditions, α‐subunit receptor brain had an apparent M r 127,000, distinctly lower than that seen both liver (apparent = 136,000). Exposure to neuraminidase increased electrophoretic mobility receptor, but no effect on brain. The carbohydrate moieties were further by chromatography...
Journal Article Metabolic Clearance and Plasma Half Disappearance Time of Exogenous Gonadotropin Releasing Hormone in Normal Subjects Patients with Liver Disease Chronic Renal Failure Get access B. PIMSTONE, PIMSTONE 1Isotope Immunoassay Laboratory Laboratory, Department Medicine, University Cape Town Province, South Africa Search for other works by this author on: Oxford Academic Google Scholar S. EPSTEIN, EPSTEIN M. HAMILTON, HAMILTON D. LeROITH, LeROITH HENDRICKS The Clinical...
Abstract The velocity and acceleration at which the ball-carrier or tackler enters tackle may contribute to winning contest prevailing injury free. Velocity have been quantified in controlled settings, whereas match-play it has subjectively described. purpose of this study was determine before contact during three competitions (Super 14, Varsity Cup, Under-19 Currie Cup). Using a two-dimensional scaled version field, were measured every 0.1 s for 0.5 s. For front-on tackles, significant...
Immunoreactive insulin (IRI) responses to oral and/or intravenous (IV) glucose were measured in kwashiorkor and marasmus. Responses expressed either as peak IRI levels attained or insulin-glucose ratios. Similar measurements made normal controls. After glucose, secretion was abnormally low every patient with most of the marasmic cases. IV noted more often, presumably associated greater glycemic stimulus. This particularly noticeable In both groups subjects there improvement after three six...
Background Understanding the mechanism of injury is necessary for development effective prevention strategies. Video analysis injuries provides valuable information on playing situation and athlete-movement patterns, which can be used to formulate these Therefore, we conducted a video concussion in junior-level rugby union compared it with representative matched non-injury sample. Methods Injury reports 18 events were collected from 2011 2013 under-18 Craven Week tournaments. Also, footage...
Limited research has compared the physical qualities of adolescent rugby union (RU) players across differing playing standards. This study therefore academy and school Under-18 RU players. One-hundred eighty-four (professional regional academy, n = 55 school, 129) male underwent a testing battery to quantify height, body mass, strength (bench press pull-up), speed (10, 20 40 m), 10 m momentum (calculated; velocity * mass) proxy measure aerobic fitness (Yo-Yo Intermittent Recovery Test Level...
The majority of injuries in rugby union occur during tackle events. mechanisms and causes these are well established senior union.To use information from an injury database assess video footage tackle-related youth matches to identify environmental factors that potentially confounding injuries.Descriptive epidemiological study.Injury surveillance was conducted at the under-18 Craven Week tournament. Tackle-related used events match (role-matched noninjury were identified for cohort injured...
ABSTRACT DRAWING FROM SKILL ACQUISITION AND DEVELOPMENT LITERATURE, WE PRESENT A NOVEL TACKLE TRAINING FRAMEWORK. THE FRAMEWORK OUTLINES PURPOSE (TECHNIQUE PROFICIENCY, TECHNIQUE CAPACITY, CAPACITY), WORKLOAD MEASUREMENTS (AVAILABLE INFORMATION, TASK DIFFICULTY, RATING OF PERCEIVED CHALLENGE, LOAD), AS WELL CONDITIONS COACHING STYLE FOR IN RUGBY UNION. USING THIS LOAD MEASUREMENTS, PROPOSE PRESEASON PLAN. SERVE POTENTIAL PREVENTIVE MEASURES INJURY RISK WHILE IMPROVING PLAYERS' PERFORMANCE....