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Journal of Sports Science & Medicine

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https://www.readbyqxmd.com/read/28344464/the-biomechanics-of-standing-start-and-initial-acceleration-reliability-of-the-key-determining-kinematics
#1
Regan J Standing, Peter S Maulder
The reliability of the key determining kinematic variables associated with short sprint performance provide insight into how and why movement may vary between individual trials. Currently, literature surrounding these determinants is scarce when investigating the first three strides of a sprint. The purpose of this study was to investigate the reliability of sprint acceleration and the key kinematic determinants involved during the first three steps of the movement. The aim was to use a practical method of kinematic analysis to help explain why changes may occur in sprint performance via the use of correlative statistics and to provide reference values for intervention research to make conclusions about their change scores...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344463/curcumin-and-piperine-supplementation-and-recovery-following-exercise-induced-muscle-damage-a-randomized-controlled-trial
#2
Barthélémy Delecroix, Abd Elbasset Abaïdia, Cédric Leduc, Brian Dawson, Grégory Dupont
The aim of this study was to analyze the effects of oral consumption of curcumin and piperine in combination on the recovery kinetics after exercise-induced muscle damage. Forty-eight hours before and following exercise-induced muscle damage, ten elite rugby players consumed curcumin and piperine (experimental condition) or placebo. A randomized cross-over design was performed. Concentric and isometric peak torque for the knee extensors, one leg 6 seconds sprint performance on a non-motorized treadmill, counter movement jump performance, blood creatine kinase concentration and muscle soreness were assessed immediately after exercise, then at 24h, 48h and 72h post-exercise...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344462/effects-of-neuromuscular-training-on-the-rear-foot-angle-kinematics-in-elite-women-field-hockey-players-with-chronic-ankle-instability
#3
Eunkuk Kim, Hokyung Choi, Jung-Hoon Cha, Jong-Chul Park, Taegyu Kim
The aims of this study were to investigate the ankle position, the changes and persistence of ankle kinematics after neuromuscular training in athletes with chronic ankle instability (CAI). A total of 21 national women's field hockey players participated (CAI = 12, control = 9). Ankle position at heel strike (HS), midstance (MS), and toe touch (TT) in the frontal plane during walking, running and landing were measured using 3D motion analysis. A 6-week neuromuscular training program was undertaken by the CAI group...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344461/within-session-sequence-of-balance-and-plyometric-exercises-does-not-affect-training-adaptations-with-youth-soccer-athletes
#4
Mehdi Chaouachi, Urs Granacher, Issam Makhlouf, Raouf Hammami, David G Behm, Anis Chaouachi
The integration of balance and plyometric training has been shown to provide significant improvements in sprint, jump, agility, and other performance measures in young athletes. It is not known if a specific within session balance and plyometric exercise sequence provides more effective training adaptations. The objective of the present study was to investigate the effects of using a sequence of alternating pairs of exercises versus a block (series) of all balance exercises followed by a block of plyometric exercises on components of physical fitness such as muscle strength, power, speed, agility, and balance...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344460/intra-and-inter-rater-reliability-of-the-modified-tuck-jump-assessment
#5
Azahara Fort-Vanmeerhaeghe, Alicia M Montalvo, Rhodri S Lloyd, Paul Read, Gregory D Myer
The Tuck Jump Assessment (TJA) is a clinician-friendly screening tool that was designed to support practitioners with identification of neuromuscular deficits associated with anterior cruciate ligament injury. This study aimed to evaluate the inter- and intra-rater reliability of the modified scoring (0 to 2) TJA to add an additional range of objectivity for each criterion. A total of 24 elite youth volleyball athletes (12 males and 12 females) were included in this study. Each participant's recorded performance of the TJA was scored independently by two raters across ten criteria using the modified scale...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344459/applied-sports-nutrition-support-dietary-intake-and-body-composition-changes-of-a-female-athlete-completing-26-marathons-in-26-days-a-case-study
#6
Chris J McManus, Kelly A Murray, David A Parry
The aim of this case study is to describe the nutrition practices of a female recreational runner (VO2max 48.9 ml·kg(-1)·min(-1)) who completed 26 marathons (42.195 km) in 26 consecutive days. Information relating to the nutritional intake of female runners during multi-day endurance events is extremely limited, yet the number of people participating year-on-year continues to increase. This case study reports the nutrition intervention, dietary intake, body composition changes and performance in the lead-up and during the 26 days...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344458/the-effects-of-non-contingent-feedback-on-the-incidence-of-plateau-at-v%C3%AC-o2max
#7
Dan Gordon, Marie Gernigon, James Baker, Viviane Merzbach, Adrian Scruton
The purpose of this study was to examine the effects of non-contingent feedback in the form of heart rate (HR) on the incidence of plateau at V̇O2max. Ten physically active males (age 24.8 yrs ± 4.2; mass 81.4 ± 9.0 kg; stature 1.80 ± 0.11 m, V̇O2max 53.2 ± 5.8 ml·kg(-1.)min(-1)) who were V̇O2max testing naïve but were cognisant as to the heart rate responses to exercise completed four incremental tests to volitional exhaustion, separated by ~72 h for the determination of V̇O2max and gas exchange threshold...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344457/bone-mineralization-in-rhythmic-gymnasts-entering-puberty-associations-with-jumping-performance-and-body-composition-variables
#8
Kristel Võsoberg, Vallo Tillmann, Anna-Liisa Tamm, Katre Maasalu, Jaak Jürimäe
This study examined bone mineral density (BMD) accrual in prepubertal rhythmic gymnasts entering puberty and their age-matched untrained control girls, and associations with baseline jumping performance and body composition over the 3-year period. Whole body (WB) and femoral neck (FN) BMD, WB fat mass (FM) and fat free mass (FFM), countermovement jump (CMJ) and rebound jumps for 15 s (RJ15s) were assessed in 25 rhythmic gymnasts and 25 untrained controls at baseline and after 3-year period. The changes over this period were calculated (Δ scores)...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344456/caffeine-ingestion-improves-repeated-freestyle-sprints-in-elite-male-swimmers
#9
Paul S R Goods, Grant Landers, Sacha Fulton
The purpose of this investigation was to determine the efficacy of a moderate dose of caffeine to improve repeat-sprint performance in elite freestyle sprinters. Nine highly trained male swimmers performed 6 x 75 m freestyle sprints on two occasions 1-h after consuming either 3 mg·kg(-1) caffeine (CAF), or placebo, in a cross-over manner. Capillary blood samples for the analysis of blood lactate concentration and pH were collected after the 1(st), 3(rd), and 5(th) sprint, while heart rate and perceived exertion (RPE) were collected after every sprint...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344455/running-and-metabolic-demands-of-elite-rugby-union-assessed-using-traditional-metabolic-power-and-heart-rate-monitoring-methods
#10
Romain Dubois, Thierry Paillard, Mark Lyons, David McGrath, Olivier Maurelli, Jacques Prioux
The aims of this study were (1) to analyze elite rugby union game demands using 3 different approaches: traditional, metabolic and heart rate-based methods (2) to explore the relationship between these methods and (3) to explore positional differences between the backs and forwards players. Time motion analysis and game demands of fourteen professional players (24.1 ± 3.4 y), over 5 European challenge cup games, were analyzed. Thresholds of 14.4 km·h(-1), 20 W.kg(-1) and 85% of maximal heart rate (HRmax) were set for high-intensity efforts across the three methods...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344454/the-effect-of-intermittent-head-cooling-on-aerobic-performance-in-the-heat
#11
Peter Walters, Nathaniel Thom, Kai Libby, Shelby Edgren, Amanda Azadian, Daniel Tannous, Elisabeth Sorenson, Brian Hunt
Thermoregulation is critical for athletes, particularly those for those who must perform in the heat. Most strategies aimed at reducing heat stress have cooled participants before or during activity. The objective of this study is to investigate whether seven minutes of head cooling applied between bouts of aerobic exercise in hot (35 ± 1.0 °C) and dry (14.68 ±4.29% rh) environmental conditions could positively effect participants peak power output (PP) on a maximal effort graded exercise test (GXT). Twenty-two recreational active men ages 18 to 23 (19...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344453/high-intensity-exercise-and-carbohydrate-supplementation-do-not-alter-plasma-visfatin
#12
Paul F Mellick, Bryan J Feger, Douglas J Oberlin, Paul G Davis, Laurie Wideman
The purpose of the study was to examine the effect of high-intensity exercise and carbohydrate supplementation (CHO) on plasma visfatin. On 2 separate days, 10 sprint-trained males (age = 26.4 ± 5.3 yr; Ht = 1.77 ± 0.03 m; Wt = 78.78 ± 9.10 kg; BF% = 13.96 ± 7.28%) completed 4, 3-min bouts of cycling at 50% mean anaerobic power, with 6 min of rest between bouts. On CHO day, subjects ingested 50g of CHO 30 min before exercise. On control day, subjects ingested a sugar-free drink (CON) 30 min before exercise...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344452/the-effects-of-a-sports-nutrition-education-intervention-on-nutritional-status-sport-nutrition-knowledge-body-composition-and-performance-during-off-season-training-in-ncaa-division-i-baseball-players
#13
Fabrício Eduardo Rossi, Andrew Landreth, Stacey Beam, Taylor Jones, Layne Norton, Jason Michael Cholewa
This study investigated the effects of a sport nutrition education intervention (SNEI) on dietary intake, knowledge, body composition, and performance in NCAA Division I baseball players. Resistance trained NCAA Division I baseball players (82.4 ± 8.2 kg; 1.83 ± 0.06 m; 13.7 ± 5 % body fat) participated in the study during 12 weeks of off-season training. Fifteen players volunteered for SNEI while 15 players matched for position served as controls (C) for body composition and performance. The nutrition intervention group (NI) received a 90 min SNEI encompassing energy intake (Kcal), carbohydrate (CHO), protein (PRO), fat, food sources, and hydration...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344451/retrospective-injury-epidemiology-and-risk-factors-for-injury-in-crossfit
#14
Alicia M Montalvo, Hilary Shaefer, Belinda Rodriguez, Tan Li, Katrina Epnere, Gregory D Myer
The objective of the study is to examine injury epidemiology and risk factors for injury in CrossFit athletes. A survey was administered to athletes at four owner-operated facilities in South Florida. Respondents reported number, location of injury, and training exposure from the preceding six months and answered questions regarding potential risk factors for injury. Fifty out of 191 athletes sustained 62 injuries during CrossFit participation in the preceding six months. The most frequently injured locations were the shoulder, knee, and lower back...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344450/test-re-test-reliability-of-four-versions-of-the-3-cone-test-in-non-athletic-men
#15
Jason G Langley, Robert D Chetlin
Until recently, measurement and evaluation in sport science, especially agility testing, has not always included key elements of proper test construction. Often tests are published without reporting reliability and validity analysis for a specific population. The purpose of the present study was to examine the test re-test reliability of four versions of the 3-Cone Test (3CT), and provide guidance on proper test construction for testing agility in athletic populations. Forty male students enrolled in classes in the Department of Physical Education at a mid-Atlantic university participated...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344449/the-effects-of-3-weeks-of-uphill-and-downhill-walking-on-blood-lipids-and-glucose-metabolism-in-pre-diabetic-men-a-pilot-study
#16
Marc Philippe, Hannes Gatterer, Erika Maria Eder, Alexander Dzien, Matthias Somavilla, Andreas Melmer, Christoph Ebenbichler, Tom Müller, Martin Burtscher
The prevention of type 2 diabetes in persons at risk for diabetes is of utmost importance. Physical activity in general and even exercises at moderate intensities such as walking significantly reduce the risk of the development of type 2 diabetes. However, it is still a matter of debate whether lipids and glucose metabolism are differently affected by regular concentric (e.g., uphill walking) and eccentric (e.g., downhill walking) endurance exercise. The aim of this study was to investigate the effects of short-term (3 weeks) uphill and downhill walking on glucose metabolism and blood lipids in pre-diabetic middle-aged men in a real world setting...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344448/is-empirical-research-on-periodization-trustworthy-a-comprehensive-review-of-conceptual-and-methodological-issues
#17
REVIEW
José Afonso, Pantelis T Nikolaidis, Patrícia Sousa, Isabel Mesquita
Periodization is a core concept in training. Recently, systematic reviews and meta-analyses have attempted to provide a comprehensive overview of the topic, but theoretical criticisms have arisen with regard to how such research has been conducted. The purpose of the study was to review comprehensively the conceptual and methodological issues surrounding empirical research on periodization in training with human subjects. A search was conducted late in February 2016 on Academic Search Complete, CINAHL Plus, MedicLatina, MEDLINE, PsycINFO, PubMed, Scielo, Scopus, SPORTDiscus and Web of Science...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344447/movement-demands-and-running-intensities-of-semi-professional-rugby-league-players-during-a-9-s-tournament-a-case-study
#18
Paul Inglis, Stephen P Bird
The objective of the study was to describe the movement demands and running intensities of semi-professional rugby league players during a rugby league 9's (RL9's) tournament. Six semi-professional rugby league players competed in a RL9's tournament over a two-day period comprising of six games. Movement demands and running intensities were recorded using Global Positioning System (GPS) devices providing data on distance and speeds. Data is presented as mean (95% Confidence Intervals) with changes (≥ 75%) likely to exceed the smallest worthwhile change (0...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344446/prediction-of-tennis-performance-in-junior-elite-tennis-players
#19
Tamara Kramer, Barbara C H Huijgen, Marije T Elferink-Gemser, Chris Visscher
Predicting current and future tennis performance can lead to improving the development of junior tennis players. The aim of this study is to investigate whether age, maturation, or physical fitness in junior elite tennis players in U13 can explain current and future tennis performance. The value of current tennis performance for future tennis performance is also investigated. A total of 86 junior elite tennis players (boys, n = 44; girls, n = 42) U13 (aged: 12.5 ± 0.3 years), and followed to U16, took part in this study...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28344445/effects-of-static-and-dynamic-stretching-on-the-isokinetic-peak-torques-and-electromyographic-activities-of-the-antagonist-muscles
#20
Abdullah Serefoglu, Ufuk Sekir, Hakan Gür, Bedrettin Akova
The aim of this study was to investigate if static and dynamic stretching exercises of the knee muscles (quadriceps and hamstring muscles) have any effects on concentric and eccentric isokinetic peak torques and electromyographic amplitudes (EMG) of the antagonist muscles. Twenty healthy male athletes (age between 18-30 years) voluntarily participated in this study. All of the subjects visited the laboratory to complete the following intervention in a randomized order on 5 separate days; (a) non-stretching (control), (b) static stretching of the quadriceps muscles, (c) static stretching of the hamstring muscles, (d) dynamic stretching of the quadriceps muscles, and (e) dynamic stretching of the hamstring muscles...
March 2017: Journal of Sports Science & Medicine
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