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Journal of Science and Medicine in Sport

Philip X Fuchs, Andrea Fusco, Jeffrey W Bell, Serge P von Duvillard, Cristina Cortis, Herbert Wagner
OBJECTIVES: Performance factors in the volleyball spike jump are well known for male players; however, technical-coordinative differences for female players are known only marginally. The objective of this study was to investigate the relationship between movement characteristics and female' spike jump performance and to identify the most relevant aspects of jump height and ball velocity. DESIGN: Single group correlation and regression. METHODS: Fifteen elite female volleyball players performed spike jumps by striking a stationary ball at maximal jump height...
January 6, 2019: Journal of Science and Medicine in Sport
Alannah K A McKay, Peter Peeling, David B Pyne, Marijke Welvaert, Nicolin Tee, Jill J Leckey, Avish P Sharma, Megan L R Ross, Laura A Garvican-Lewis, Rachel P L van Swelm, Coby M Laarakkers, Louise M Burke
OBJECTIVES: Adhering to a low carbohydrate (CHO) high fat (LCHF) diet can alter markers of iron metabolism in endurance athletes. This investigation examined the re-introduction of CHO prior to, and during exercise on the iron-regulatory response to exercise in a homogenous (in regard to serum ferritin concentration) group of athletes adapted to a LCHF diet. DESIGN: Parallel groups design. METHODS: Three weeks prior to the exercise trials, twenty-three elite race walkers adhered to either a CHO-rich (n=14) or LCHF diet (n=9)...
January 4, 2019: Journal of Science and Medicine in Sport
S A Tomaz, R A Jones, T Hinkley, S L Bernstein, R Twine, K Kahn, S A Norris, C E Draper
OBJECTIVES: No studies have investigated gross motor skill (GMS) proficiency of preschool-aged children across different income settings in South Africa. Research from high-income countries suggests that children from low-income settings display poorer GMS proficiency compared to higher-income peers. This study aimed to (1) describe GMS proficiency of preschool-aged children in urban high-income (UH), urban low-income (UL) and rural low-income (RL) settings; and (2) explore differences in proficiency between income settings and sex...
December 24, 2018: Journal of Science and Medicine in Sport
Rhys Tribolet, Mark L Watsford, Aaron J Coutts, Chris Smith, Job Fransen
OBJECTIVES: This study aimed to assess the first instance and prevalence of the Relative Age Effect (RAE) in the male Australian Football (AF) talent development pathway through to the Australian Football League (AFL). DESIGN: Retrospective cross-sectional analysis. METHODS: Birthdate distribution was accessed from an U10-U12 AF academy trial (n=514), U13-U19 AF academy players (n=408), AFL state, national and international combines (n=2989), AFL Rising Star nominees (n=50) and the top ten AFL Brownlow vote recipients (n=50) between 2013-2017...
December 24, 2018: Journal of Science and Medicine in Sport
Byron J Kemp, Dylan P Cliff, Kar Hau Chong, Anne-Maree Parrish
OBJECTIVES: Physical activity (PA) participation is prone to decline during adolescence. An understanding of the domains of PA that are susceptible to decline may support a more targeted approach to PA and health promotion. The aim of this study was to review longitudinal trends in participation in four PA domains during childhood and adolescence: organized PA, non-organized PA, active transport and active chores. DESIGN: Systematic review. METHODS: 5517 research articles were sourced from five electronic databases (covering January 1997-April 2018)...
December 21, 2018: Journal of Science and Medicine in Sport
Suzanna Russell, David Jenkins, Mitchell Smith, Shona Halson, Vincent Kelly
OBJECTIVES: Mental fatigue resulting from prolonged periods of demanding cognitive activity, has been found to impair endurance exercise performance and performance in some sport-specific tasks. The application of such research to the elite sporting environment however is limited. DESIGN & METHODS: This article reviews the literature relevant to mental fatigue and team sporting performance with aim to provide perspectives on the transferability and significance of currently available evidence to the applied elite sporting context...
December 21, 2018: Journal of Science and Medicine in Sport
Jasper Verheul, Warren Gregson, Paulo Lisboa, Jos Vanrenterghem, Mark A Robinson
OBJECTIVES: Unlike physiological loads, the biomechanical loads of training in running-based sports are still largely unexplored. This study, therefore, aimed to assess the validity of estimating ground reaction forces (GRF), as a measure of external whole-body biomechanical loading, from segmental accelerations. METHODS: Fifteen team-sport athletes performed accelerations, decelerations, 90° cuts and straight running at different speeds including sprinting. Full-body kinematics and GRF were recorded with a three-dimensional motion capture system and a single force platform respectively...
December 21, 2018: Journal of Science and Medicine in Sport
Ilana N Ackerman, Megan A Bohensky, Joanne L Kemp, Richard de Steiger
OBJECTIVES: Knee injury is strongly associated with the development of knee osteoarthritis. While there is preliminary evidence for an increased risk of knee replacement (KR) surgery after sports injury, no studies have investigated this at a population level. This population-level study aimed to quantify the likelihood of KR surgery and direct healthcare costs 10-15 years after sports injury. DESIGN: Statewide population-based cohort study. METHODS: The cohort was established by linking two key administrative datasets capturing all hospital admissions and emergency department (ED) presentations in Victoria, Australia...
December 21, 2018: Journal of Science and Medicine in Sport
Kyle J M Bennett, Andrew R Novak, Matthew A Pluss, Aaron J Coutts, Job Fransen
OBJECTIVES: To investigate the construct and discriminant validity of a video-based decision-making assessment for talent identification in youth soccer. DESIGN: Observational study. METHOD: A total of 328 academy youth soccer players (tier one, tier two, and tier three) from three developmental stages (late childhood, early adolescence, and mid-adolescence) participated in this study. The control group consisted of 59 youth athletes with no soccer experience in the last five years...
December 21, 2018: Journal of Science and Medicine in Sport
Prasanna J Gamage, Lauren V Fortington, Alex Kountouris, Caroline F Finch
OBJECTIVES: Understanding the nature of injuries in cricket is key to mitigate injury risks and prioritise preventive measures. This study aimed to identify the incidence and nature of match injuries among Sri Lankan junior cricketers. DESIGN: Longitudinal follow-up study with prospective in-season data collection. METHODS: A national survey of schoolboy, division-1 cricket teams in under-15 and under-17 age groups. Using a paper-based questionnaire, distributed to school-teams at the start of the 2016 cricket season, respondents recorded any injuries, including the site, type and mechanism...
December 18, 2018: Journal of Science and Medicine in Sport
Yasuki Sekiguchi, William M Adams, Ryan M Curtis, Courteney L Benjamin, Douglas J Casa
OBJECTIVES: To investigate the roles that training load and environmental conditions have on fluid balance during a collegiate men's soccer preseason. DESIGN: Observational study. METHODS: Twenty-eight male collegiate soccer players (mean±SD; age, 20±1.7y; body mass (BM), 79.9±7.3kg; height, 180.9±6.8cm; body fat, 12.7±3.1%; VO2max , 50.7±4.3ml·kg-1 ·min-1 ) participated in this study. Prior to (PRE) and following (POST) each team session, BM, percent BM loss (%BML) and hydration status was measured...
December 14, 2018: Journal of Science and Medicine in Sport
Nicolas Aguilar-Farias, Pía Martino-Fuentealba, Nicolas Salom-Diaz, Wendy J Brown
OBJECTIVES: The purpose of this study was to determine the number of monitoring days needed to reliably measure weekly activity behaviours with the ActivPAL (AP) monitor in adults. DESIGN: Cross-sectional study. METHODS: Participants (90 adults (51.1% men); age=39.1±12.43 years) wore an AP for 7 consecutive days. Mean time spent sitting/lying, standing and stepping per day, and mean number of transitions from sitting to standing per day were calculated for each participant using 7 days of monitoring (reference)...
December 14, 2018: Journal of Science and Medicine in Sport
Michael I C Kingsley, Rashmika Nawaratne, Paul D O'Halloran, Alexander H K Montoye, Damminda Alahakoon, Daswin De Silva, Kiera Staley, Matthew Nicholson
OBJECTIVES: To compare accelerometry-derived estimates of physical activity from 9 wrist-specific predictive models and a reference hip-specific method. DESIGN: Prospective cohort repeated measures study. METHODS: 110 participants wore an accelerometer at wrist and hip locations for 1 week of free-living. Accelerometer data from three axes were used to calculate physical activity estimates using existing wrist-specific models (3 linear and 6 artificial neural network models) and a reference hip-specific method...
December 11, 2018: Journal of Science and Medicine in Sport
Pontus Henriksson, Marja H Leppänen, Hanna Henriksson, Christine Delisle Nyström, Cristina Cadenas-Sanchez, Anna Ek, Jonatan R Ruiz, Francisco B Ortega, Marie Löf
OBJECTIVES: Although physical fitness is considered a marker of health in youth, little is known whether physical fitness in pre-school age is related to later body composition. Thus, this study investigated (i) associations of physical fitness at 4.5years of age with body composition 12months later and (ii) whether improvements in physical fitness during the 12-month follow-up were associated with changes in body composition. DESIGN: This study included 142 children, measured at 4...
December 7, 2018: Journal of Science and Medicine in Sport
Owen Jeffries, Mark Waldron
OBJECTIVES: Menthol is an organic compound with non-thermal cooling properties that has been shown to relieve thermal strain associated with exercise in the heat; however, its effects on performance have not been systematically analysed. The aims were to determine the effects of menthol applied (1) internally and (2) externally on exercise performance and thermal sensation. DESIGN: Meta-analysis METHODS: A search was performed using various databases in August 2018...
December 6, 2018: Journal of Science and Medicine in Sport
Joseph M Northey, Kate L Pumpa, Clare Quinlan, Ashley Ikin, Kellie Toohey, Disa J Smee, Ben Rattray
OBJECTIVES: The current study investigated the effects of two exercise interventions on cognitive function amongst breast cancer survivors. DESIGN: Pilot randomised-controlled trial. METHODS: Seventeen female cancer survivors (mean: 62.9±7.8years) were randomised into three groups: high-intensity interval training (HIIT, n=6); moderate-intensity continuous training (MOD, n=5); or wait-list control (CON, n=6). The HIIT and MOD groups exercised on a cycle ergometer 3days/week for 12-weeks...
December 6, 2018: Journal of Science and Medicine in Sport
Sebastian Ludyga, Sabrina Köchli, Uwe Pühse, Markus Gerber, Henner Hanssen
OBJECTIVES: To investigate the effect of combined aerobic and coordinative exercise on retinal microcirculation and its association with changes in cognitive performance in healthy adolescents. DESIGN: Using cluster-randomization (on class-level), 36 participants were allocated to an exercise group (EX) performing a 20-min aerobic and coordinative exercise session on each school day over a period of 8 weeks or a control group, which was encouraged to have social interactions (CON)...
December 6, 2018: Journal of Science and Medicine in Sport
L Leventer, F Eek, M Lames
OBJECTIVE: High fluctuations in injury-risk during the playing season in soccer have been reported. As seasons are structured in periods with homogenous loads and intensities, we investigated injury-risk over season periods, contrarily to previous studies adopting a month-based approach. DESIGN: Cohort study; Level of evidence, 2. METHODS: Incidence-rate ratios (IRRs) for match and training injuries were compared across six consecutive seasons of German Bundesliga, divided into six periods each: Pre-season (PS), winter-break (WB), quarter 1-4: (Q1-Q4)...
December 6, 2018: Journal of Science and Medicine in Sport
Benjamin E Scott, Paul B Laursen, Lewis J James, Benjamin Boxer, Zoe Chandler, Elliot Lam, Tom Gascoyne, Jack Messenger, Stephen A Mears
OBJECTIVES: Ingested ketogenic agents offer the potential to enhance endurance performance via the provision of an alternative exogenous, metabolically efficient, glycogen-sparing fuel (i.e. ketone bodies). This study aimed to assess the impact of combined carbohydrate and 1,3-butanediol (CHO-BD) supplementation on endurance performance, blood beta-hydroxybutyrate (βHB) concentration and glycolytic activity, in comparison to carbohydrate supplementation alone (CHO). DESIGN: Eleven male runners (age 38±12years, mass 67...
December 6, 2018: Journal of Science and Medicine in Sport
Timothy E Hewett
No abstract text is available yet for this article.
December 5, 2018: Journal of Science and Medicine in Sport
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