Sports Sciences Commons^™

Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function, Oliver R. Barley, Dale W. Chapman, Anthony J. Blazevich, Chris R. Abbiss

Research outputs 2014 to 2021

Introduction/Purpose: This study examined the influence of acute dehydration on neuromuscular function.

Methods: On separate days, combat sports athletes experienced in acute dehydration practices (n = 14) completed a 3 h passive heating intervention (40∘C, 63% relative humidity) to induce dehydration (DHY) or a thermoneutral euhydration control (25∘C, 50% relative humidity: CON). In the ensuing 3 h ad libitum fluid and food intake was allowed, after which participants performed fatiguing exercise consisting of repeated unilateral knee extensions at 85% of their maximal voluntary isometric contraction (MVIC) torque until task failure. Both before and after the fatiguing protocol participants performed …

The Burden Of Hospitalized Sports-Related Injuries In Children: An Australian Population-Based Study, 2005–2013, Francisco J. Schneuer, Jane C. Bell, Susan E. Adams, Julie Brown, Caroline Finch, Natasha Nassar

Research outputs 2014 to 2021

Background

There is concern about recent increase and severity of sports-related injuries in children. Despite the benefits of sports participation, injuries may carry long-term health consequences. We aimed to evaluate the prevalence, characteristics and types of hospitalized sports-related injuries in children.

Methods

Population-based study of all acute sports-related injuries requiring hospitalization in children 5 to 15 years of age in New South Wales (NSW), Australia, 2005–2013. Health information was obtained from the NSW Admitted Patient Data Collection, a census of all hospital admissions from public and private hospitals. Children with a recorded ICD10-AM injury code (S00-T79) and sport-related activity code …

Metabolic And Fatigue Profiles Are Comparable Between Prepubertal Children And Well-Trained Adult Endurance Athletes, Anthony Birat, Pierre Bourdier, Enzo Piponnier, Anthony J. Blazevich, Hugo Maciejewski, Pascale Duche, Sebastien Ratel

Research outputs 2014 to 2021

The aim of this study was to determine whether prepubertal children are metabolically comparable to well-trained adult endurance athletes and if this translates into similar fatigue rates during high-intensity exercise in both populations. On two different occasions, 12 prepubertal boys (10.5 ± 1.1 y), 12 untrained men (21.2 ± 1.5 y), and 13 endurance male athletes (21.5 ± 2.7 y) completed an incremental test to determine the power output at VO_2max (PVO_2max) and a Wingate test to evaluate the maximal anaerobic power (P_max) and relative decrement in power output (i.e., the fatigue index, FI). Furthermore, …

The Effects Of Acute And Chronic Sprint-Interval Training On Cytokine Responses Are Independent Of Prior Caffeine Intake, Guilherme Ferreira, Leandro Felippe, Rômulo Bertuzzi, David Bishop, Emiliano Barreto, Fernando De-Oliveira, Adriano Lima-Silva

Research outputs 2014 to 2021

We examined the effect of acute and chronic sprint interval training (SIT), with or without prior caffeine intake, on levels of exercise-induced inflammatory plasma cytokines [interleukin (IL)-6, IL-10, tumor necrosis factor (TNF)-α]. Twenty physically-active men ingested either a placebo (n = 10) or caffeine (n = 10) 1 h before each SIT session(13-s × 30-s sprint/15 s of rest) during six training sessions (2 weeks). The early (before, immediately after, and 45 min after the exercise) and late (24 and 48 h after the exercise) cytokine and creatine kinase (CK) responses were analyzed for the first and last …

Pilot Study: Knowledge And Attitudes Regarding Sport-Related Concussion In A Rural Interscholastic Sport Sample, Austin Westland

Electronic Theses and Dissertations

Context: Evidence supports education initiatives to improve knowledge of sport-related concussion (SRC) in active children and adolescents, as well as improve attitudes towards reporting concussion events to a supervising adult with the ultimate goal of early diagnosis and management. Most evidence focuses on urban and suburban children’s SRC knowledge and attitudes; however, little is known regarding knowledge and attitudes of children participating in sport in rural environments. Understanding current knowledge and attitudes of rural children can inform future education and health behavior strategies that encourage early reporting. Objective: Two objectives guided this study. First, obtain and analyze pilot data regarding …

Effectiveness Of A Low-Budget Sports Vision Training Program For Improving Batting Statistics Of An Ncaa Division I Baseball Team, Adam J. Melstrom

Electronic Theses and Dissertations

Context: Sports vision training (SVT) has been increasing in popularity among many dynamic reactive sports. Dynamic reactive sports require extremely accurate detection and discrimination of visual stimuli in order to execute a precise motor response. Manual interception, locomotion, and depth judgement are found to be the most important visuomotor abilities with interceptive sports such as baseball. Baseball is a highly visually demanding sport, especially offensively. The effectiveness of the batter is dependent on his/her ability to locate, track, and swing at a projectile in ~0.2 seconds. This presents the opportunity to implement an SVT program with a baseball team as …

Case Report: A Novel Ocular Screening Aid For Detection Of Sport-Related Concussion In High School Athletes, Payton Monson

Electronic Theses and Dissertations

Objective: The purpose of this study was to develop, implement and determine the general effectiveness of a novel battery of ocular tests referred to as the Rapid Ocular Screening Test (ROST) that can be performed efficiently on the sideline and is based on our current understanding of the physiological effects of blunt head trauma on ocular functioning.
Background: Assessment of ocular function following a suspected head-injury has been recognized as an important adjunct to a concussion evaluation protocol; however, sideline-screening recommendations currently do not include a comprehensive set of ocular functioning tests. Three high school student athletes who suffered a …

Time On Androgen Deprivation Therapy And Adaptations To Exercise: Secondary Analysis From A 12-Month Randomized Controlled Trial In Men With Prostate Cancer, Dennis R. Taaffe, Laurien M. Buffart, Robert U. Newton, Nigel Spry, James Denham, David Joseph, David Lamb, Suzanne K. Chambers, Daniel A. Galvao

Research outputs 2014 to 2021

Objectives

To explore if duration of previous exposure to androgen deprivation therapy (ADT) in men with prostate cancer (PCa) undertaking a year-long exercise programme moderates the exercise response with regard to body composition and muscle performance, and also to explore the moderator effects of baseline testosterone, time since ADT, and baseline value of the outcome.

Patients and Methods

In a multicentre randomized controlled trial, 100 men who had previously undergone either 6 months (short-term) or 18 months (long-term) of ADT in combination with radiotherapy, as part of the TROG 03.04 RADAR trial, were randomized to 6 months supervised exercise, followed …

Interpreting Signal Amplitudes In Surface Electromyography Studies In Sport And Rehabilitation Sciences, Andrew D. Vigotsky, Israel Halperin, Gregory J. Lehman, Gabriel S. Trajano, Taian M. Vieira

Research outputs 2014 to 2021

Surface electromyography (sEMG) is a popular research tool in sport and rehabilitation sciences. Common study designs include the comparison of sEMG amplitudes collected from different muscles as participants perform various exercises and techniques under different loads. Based on such comparisons, researchers attempt to draw conclusions concerning the neuro- and electrophysiological underpinning of force production and hypothesize about possible longitudinal adaptations, such as strength and hypertrophy. However, such conclusions are frequently unsubstantiated and unwarranted. Hence, the goal of this review is to discuss what can and cannot be inferred from comparative research designs as it pertains to both the acute and …

Change In Knee Flexor Torque After Fatiguing Exercise Identifies Previous Hamstring Injury In Football Players, Cameron Lord, Fadi Ma'ayah, Anthony J. Blazevich

Research outputs 2014 to 2021

Muscular fatigue and interlimb strength asymmetry are factors known to influence hamstring injury risk; however, limb‐specific exacerbation of knee flexor (hamstrings) torque production after fatiguing exercise has previously been ignored. To investigate changes in muscular force production before and after sport‐specific (repeated‐sprint) and non‐specific (knee extension‐flexion) fatiguing exercise, and explore the sensitivity and specificity of isokinetic endurance (ie, muscle‐specific) and single‐leg vertical jump (ie, whole limb) tests to identify previous hamstring injury. Twenty Western Australia State League footballers with previous unilateral hamstring injury and 20 players without participated. Peak concentric knee extensor and flexor (180°∙s⁻¹) torques were …

Adult- And Peer-Created Motivational Climates In Sport And Injury Rehabilitation, Rachel Majewski

Dissertations and Theses @ UNI

The motivational climate is the environment, within an achievement setting, created by influential individuals (e.g., coach, athletic trainer, peers) through situational cues, expectations, feedback, and rewards. The way individuals within the setting interpret the motivational climate influences emotions, values, and behaviors which then directly encourages a specific state of participation. Coaches, athletic trainers, and peers need to be aware of the motivational climate they generate and the potentially constructive and detrimental effects on athletes in sport and injury rehabilitation.

The purpose of this study was to examine the relationships between the motivational climate in sport, sport commitment, and injury occurrence. …

Scoring Analysis Of The Men’S 2014, 2015 And 2016 World Championship Tour Of Surfing: The Importance Of Aerial Manoeuvres In Competitive Surfing, Brendon Ferrier, Jeremy Sheppard, Oliver R.L. Farley, Josh L. Secomb, Joanna Parsonage, Robert Newton, Sophia Nimphius

Research outputs 2014 to 2021

The aim of this study was to investigate the impact of aerial manoeuvres on scoring in professional surfing. 23,631 waves were analysed for the number and types of aerial manoeuvres performed from the 2014, 2015 and 2016 Men’s World Championship Tour. Additionally, the awarded score, timing and order of the aerial was also analysed. Descriptive statistics and Two Way ANOVA’s were performed with Sidak Multiple Comparisons Post Hoc analysis. Results were a significantly higher score being awarded (P ≤ 0.0001) when including an aerial in competition across all three seasons. In 2015 surfers were awarded a significantly larger score …

Factors Affecting Powerlifting Performance: An Analysis Of Age- And Weight-Based Determinants Of Relative Strength, Christopher Latella, Daniel Van Den Hoek, Wei-Peng Teo

Research outputs 2014 to 2021

Powerlifting (PL) is characterised by the ability to generate maximal force. However, an understanding of the factors affecting strength in PL athletes is poorly understood. Therefore, competition data were analysed from 1368 individuals during 2017. Relative strength was compared for the squat (SQ), bench press (BP) and deadlift (DL) between age groups (Sub-junior [SJ], Junior [JU], Open [OP], and Masters’ I-IV [M1-M4]), weight classes (females; 47 kg, 52 kg, 57 kg, 63 kg, 72 kg, 84 kg and + 84 kg and males; 59 kg, 66 kg, 74 kg, 83 kg, 93 kg, 105 kg, 120 kg, + 120 kg) …

Profiling Shoulder Strength In Competitive Surfers, James Furness, Ben Schram, Tim Cottman-Fields, Brendan Solia, Josh Secomb

Research outputs 2014 to 2021

The shoulder region has the highest incidence of acute injuries in the sport of surfing. Little is known about the strength profile at the shoulder in a surfing cohort. The primary aim of this study was to establish the reliability of a rotator cuff strength testing procedure for surfers with a secondary aim of providing a profile of internal and external rotation strength in a competitive surfing cohort. Shoulder internal rotation and external rotation isometric strength was measured using a hand-held dynamometer in 13 competitive surfers. Intra-class coefficient values ranged from 0.97 to 0.98 for intra-rater reliability and were lower …

Prescribing Target Running Intensities For High-School Athletes: Can Forward And Backward Running Performance Be Autoregulated?, Aaron Uthoff, Jon Oliver, John Cronin, Paul Winwood, Craig Harrison

Research outputs 2014 to 2021

Target running intensities are prescribed to enhance sprint-running performance and progress injured athletes back into competition, yet is unknown whether running speed can be achieved using autoregulation. This study investigated the consistency of running intensities in adolescent athletes using autoregulation to self-select velocity. Thirty-four boys performed 20 m forward running (FR) and backward running (BR) trials at slow, moderate and fast intensities (40–55%, 60–75% and +90% maximum effort, respectively) on three occasions. Absolute and relative consistency was assessed using the coefficient of variation (CV) and intraclass correlation coefficients (ICC). Systematic changes in 10 and 20 m performance were identified between …

The Potential Role Of Genetic Markers In Talent Identification And Athlete Assessment In Elite Sport, Ysabel Jacob, Tania Spiteri, Nicolas H. Hart, Ryan S. Anderson

Research outputs 2014 to 2021

In elite sporting codes, the identification and promotion of future athletes into specialised talent pathways is heavily reliant upon objective physical, technical, and tactical characteristics, in addition to subjective coach assessments. Despite the availability of a plethora of assessments, the dependence on subjective forms of identification remain commonplace in most sporting codes. More recently, genetic markers, including several single nucleotide polymorphisms (SNPs), have been correlated with enhanced aerobic capacity, strength, and an overall increase in athletic ability. In this review, we discuss the effects of a number of candidate genes on athletic performance, across single-skilled and multifaceted sporting codes, and …

Movement Economy In Soccer: Current Data And Limitations, Filippo Dolci, Nicolas H. Hart, Andrew Kilding, Paola Chivers, Ben Piggott, Tania Spiteri

Research outputs 2014 to 2021

Soccer is an intermittent team-sport, where performance is determined by a myriad of psychological, technical, tactical, and physical factors. Among the physical factors, endurance appears to play a key role into counteracting the fatigue-related reduction in running performance observed during soccer matches. One physiological determinant of endurance is movement economy, which represents the aerobic energy cost to exercise at a given submaximal velocity. While the role of movement economy has been extensively examined in endurance athletes, it has received little attention in soccer players, but may be an important factor, given the prolonged demands of match play. For this reason, …

Proficiency In Pole Handling During Nordic Walking Influences Exercise Effectiveness In Middle-Aged And Older Adults, Eiji Fujita, Karen Yakushi, Masaki Takeda, Mohammod Monirul Islam, Masaki Nakagaichi, Dennis Taaffe, Nobuo Takeshima

Research outputs 2014 to 2021

Nordic walking (NW) is a total body version of walking increasingly used as a health-promoting activity by middle-aged and older adults. The present study examined the relationship between force exerted through the pole and physiological response during NW. In this non-randomized exercise trial, 17 participants comprising 8 middle-aged and older recreationally trained Nordic walkers (NWrec: 63.7 ± 8.1 years) and 9 experienced NW instructors (NWinstr: 57.5 ± 7.8 years) underwent outdoor ordinary walking (OW) and NW bouts as fast as possible for 12 minutes. Walking distance, speed, heart rate (HR), energy expenditure (METs and J/kg/m) and upper and lower limb …

Active And Inactive Leg Hemodynamics During Sequential Single-Leg Interval Cycling, Nicole Gordon, Chris R. Abbiss, Mohammed Ihsan, Andrew J. Maiorana, Jeremiah J. Peiffer

Research outputs 2014 to 2021

Introduction Leg order during sequential single-leg cycling (i.e., exercising both legs independently within a single session) may affect local muscular responses potentially influencing adaptations. This study examined the cardiovascular and skeletal muscle hemodynamic responses during double-leg and sequential single-leg cycling. Methods Ten young healthy adults (28 ± 6 yr) completed six 1-min double-leg intervals interspersed with 1 min of passive recovery and, on a separate occasion, 12 (six with one leg followed by six with the other leg) 1-min single-leg intervals interspersed with 1 min of passive recovery. Oxygen consumption, heart rate, blood pressure, muscle oxygenation, muscle blood volume, and …

Relationship Between Strength And Power Production Capacities In Trained Sprint Track Cyclists, James Vercoe, Mike R. Mcguigan

Research outputs 2014 to 2021

The purpose of this study was to investigate the relationship between strength and power capabilities in trained sprint track cyclists. Ten participants including six women and four men (age: 22.1±6.8 years, body height: 176.1±6.7 cm, body weight: 72.1±7.9 kg) performed isometric mid-thigh pull (IMTP) and isokinetic sprint tests. Variables measured included peak force (PF), peak rate of force development (PRFD) for the IMTP and maximal torque and maximal power (Pmax) for the isokinetic sprint test. There was a strong relationship between PF on the IMTP and maximal peak torque values across five isokinetic sprints (r=.890-.925). Strong relationships were also shown …