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https://www.readbyqxmd.com/read/29912079/impact-of-physical-performance-and-anthropometric-characteristics-on-serve-velocity-in-elite-junior-tennis-players
#1
Janina Fett, Alexander Ulbricht, Alexander Ferrauti
Fett, J, Ulbricht, A, and Ferrauti, A. Impact of physical performance and anthropometric characteristics on serve velocity in elite junior tennis players. J Strength Cond Res XX(X): 000-000, 2018-This study aimed to investigate the impact of physical performance components and anthropometric characteristics on serve velocity (SV) in elite junior tennis players depending on the sex and age group. A sample of the best 1,019 (male = 625, female = 394) junior squad tennis players of the German Tennis Federation participated in the study involving complex anthropometric measurements (body height, body mass, sitting height, and arm span) and physical tests (e...
June 14, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29905532/chronic-vitamin-d-insufficiency-impairs-physical-performance-in-c57bl-6j-mice
#2
Kenneth L Seldeen, Manhui Pang, Merced M Leiker, Jonathan E Bard, Maria Rodríguez-Gonzalez, Mireya Hernandez, Zachary Sheridan, Norma Nowak, Bruce R Troen
Vitamin D insufficiency (serum 25-OH vitamin D < 30 ng/ml) affects 70-80% of the general population, yet the long-term impacts on physical performance and the progression of sarcopenia are poorly understood. We therefore followed 6-month-old male C57BL/6J mice ( n =6) consuming either sufficient (STD, 1000 IU) or insufficient (LOW, 125 IU) vitamin D3/kg chow for 12 months (equivalent to 20-30 human years). LOW supplemented mice exhibited a rapid decline of serum 25-OH vitamin D levels by two weeks that remained between 11-15 ng/mL for all time points thereafter...
June 14, 2018: Aging
https://www.readbyqxmd.com/read/29796193/effects-of-acute-sleep-deprivation-and-caffeine-supplementation-on-anaerobic-performance
#3
Joss Moore, Ciaran McDonald, Alan McIntyre, Kevin Carmody, Bernard Donne
Purpose: Athletes involved in team sports may be subject to varying degrees of sleep deprivation either before or after training and competition. Despite the belief among athletes and coaches of the importance of adequate sleep for ensuing performance, the effect of sleep loss on team-sport anaerobic performance remains unclear. There is conflicting evidence in the scientific literature as to the impact of acute sleep deprivation and caffeine supplementation on anaerobic performance indices...
January 2018: Sleep Science
https://www.readbyqxmd.com/read/29793108/manganese-contamination-affects-the-motor-performance-of-wild-northern-quolls-dasyurus-hallucatus
#4
Ami Fadhillah Amir Abdul Nasir, Skye F Cameron, Amanda C Niehaus, Christofer J Clemente, Frank A von Hippel, Robbie S Wilson
Neuromotor deficits are an important sign of manganese (Mn) toxicity in humans and laboratory animals. However, the impacts of Mn exposure on the motor function of wild animals remains largely unknown. Here, we assessed the impact of chronic exposure to Mn from active mining operations on Groote Eylandt, Australia on the motor function of the semi-arboreal northern quoll (Dasyurus hallucatus), an endangered species. The three motor tests conducted-maximum sprint speed on a straight run, manoeuvrability around a corner, and motor control on a balance beam-showed that elevated Mn body burden did not diminish performance of these traits...
May 21, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29727016/metabolic-stress-dependent-regulation-of-the-mitochondrial-biogenic-molecular-response-to-high-intensity-exercise-in-human-skeletal-muscle
#5
M Fiorenza, T P Gunnarsson, M Hostrup, F M Iaia, F Schena, H Pilegaard, J Bangsbo
KEY POINTS: Low-volume high-intensity exercise training promotes muscle mitochondrial adaptations that resemble the ones associated with high-volume moderate-intensity exercise training. These training-induced mitochondrial adaptations stem from the cumulative effects of transient transcriptional responses to each acute exercise bout. However, whether metabolic stress is a key mediator of the acute molecular responses to high-intensity exercise is still incompletely understood. Herein we show that, by comparing different work-matched low-volume high-intensity exercise protocols, more marked metabolic perturbations were associated with enhanced mitochondrial biogenesis-related muscle mRNA responses...
May 4, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29543081/positional-comparisons-in-the-impact-of-fatigue-on-movement-patterns-in-hockey
#6
Esther Morencos, Blanca Romero-Moraleda, Carlo Castagna, David Casamichana
PURPOSE: The aim of this study was to examine the influence of match period on the movement patterns of hockey players according to their playing position under the introduction of quarters. METHODS: Sixteen sub-elite level Spanish National League male hockey players participated in the study (age: 25.5 ± 2.9 years; body mass: 74.6 ± 5.5 kg). Global Positioning Systems (GPS) devices were used to monitor players running performance during 17 competitive matches (113 match-play profiles)...
March 15, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29489719/vertical-and-horizontal-asymmetries-are-related-to-slower-sprinting-and-jump-performance-in-elite-youth-female-soccer-players
#7
Chris Bishop, Paul Read, Jermaine McCubbine, Anthony Turner
Inter-limb asymmetries have been shown to be greater during vertical jumping compared to horizontal jumping. Notable inter-limb differences have also been established at an early age in male youth soccer players. Furthermore, given the multi-planar nature of soccer, establishing between-limb differences from multiple jump tests is warranted. At present, a paucity of data exists regarding asymmetries in youth female soccer players and their effects on physical performance. The aims of this study were to quantify inter-limb asymmetries from unilateral jump tests and examine their effects on speed and jump performance...
February 27, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29249083/effects-of-strength-training-on-the-physiological-determinants-of-middle-and-long-distance-running-performance-a-systematic-review
#8
REVIEW
Richard C Blagrove, Glyn Howatson, Philip R Hayes
BACKGROUND: Middle- and long-distance running performance is constrained by several important aerobic and anaerobic parameters. The efficacy of strength training (ST) for distance runners has received considerable attention in the literature. However, to date, the results of these studies have not been fully synthesized in a review on the topic. OBJECTIVES: This systematic review aimed to provide a comprehensive critical commentary on the current literature that has examined the effects of ST modalities on the physiological determinants and performance of middle- and long-distance runners, and offer recommendations for best practice...
May 2018: Sports Medicine
https://www.readbyqxmd.com/read/29176387/effects-of-plyometric-and-directional-training-on-speed-and-jump-performance-in-elite-youth-soccer-players
#9
Marco Beato, Mattia Bianchi, Giuseppe Coratella, Michele Merlini, Barry Drust
Beato, M, Bianchi, M, Coratella, G, Merlini, M, and Drust, B. Effects of plyometric and directional training on speed and jump performance in elite youth soccer players. J Strength Cond Res 32(2): 289-296, 2018-Soccer players perform approximately 1,350 activities (every 4-6 seconds), such as accelerations/decelerations and changes of direction (CODs) during matches. It is well established that COD and plyometric training have a positive impact on fitness parameters in football players. This study analyzed the effect of a complex COD and plyometric protocol (CODJ-G) compared with an isolated COD protocol (COD-G) training on elite football players...
February 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28859419/complex-reproductive-traits-and-whole-organism-performance
#10
T J Orr, Theodore Garland
Arnold's 1983 path-analytic paradigm, considering "morphology, performance, and fitness," has been elaborated in several ways. For example, current versions recognize the level of "behavior" (including aspects of motivation) as a filter between performance abilities (only measurable if motivation is maximal) and fitness components. Performance abilities constrain behavior, but behavioral choices may shield performance from selection. Conceptual and empirical issues remain, such as the extent to which individual variation in lower-level subordinate traits (e...
August 1, 2017: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/28623425/effects-of-a-20-week-high-intensity-strength-and-sprint-training-program-on-tibial-bone-structure-and-strength-in-middle-aged-and-older-male-sprint-athletes-a-randomized-controlled-trial
#11
T H Suominen, M T Korhonen, M Alén, A Heinonen, A Mero, T Törmäkangas, H Suominen
This randomized, controlled, high-intensity strength and sprint training trial in middle-aged and older male sprint athletes showed significant improvements in mid-tibial structure and strength. The study reveals the adaptability of aging bone, suggesting that through a novel, intensive training stimulus it is possible to strengthen bones during aging. INTRODUCTION: High-load, high-speed and impact-type exercise may be an efficient way of improving bone strength even in old age. We evaluated the effects of combined strength and sprint training on indices of bone health in competitive masters athletes, who serve as a group of older people who are likely to be able to participate in vigorous exercise of this kind...
September 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28595870/high-speed-running-and-sprinting-as-an-injury-risk-factor-in-soccer-can-well-developed-physical-qualities-reduce-the-risk
#12
Shane Malone, Adam Owen, Bruno Mendes, Brian Hughes, Kieran Collins, Tim J Gabbett
OBJECTIVES: This study investigated the association between high-speed running (HSR) and sprint running (SR) and injuries within elite soccer players. The impact of intermittent aerobic fitness as measured by the end speed of the 30-15 intermittent fitness test (30-15VIFT ) and high chronic workloads (average 21-day) as potential mediators of injury risk were also investigated. DESIGN: Observational Cohort Study. METHODS: 37 elite soccer players from one elite squad were involved in a one-season study...
March 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28557851/decrements-in-neuromuscular-performance-and-increases-in-creatine-kinase-impact-training-outputs-in-elite-soccer-players
#13
Shane Malone, Bruno Mendes, Brian Hughes, Mark Roe, Simon Devenney, Kieran Collins, Adam Owen
Malone, S, Mendes, B, Hughes, B, Roe, M, Devenney, S, Collins, K, and Owen, A. Decrements in neuromuscular performance and increases in creatine kinase impact training outputs in elite soccer players. J Strength Cond Res 32(5): 1342-1351, 2018-The aim of the current investigation was to understand the impact of pretraining neuromuscular performance and creatine kinase (CK) status on subsequent training performance in elite soccer players. Thirty soccer players (age: 25.3 ± 3.1 years; height: 183 ± 7 cm; mass: 72 ± 7 kg) were involved in this observational study...
May 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486330/the-impact-of-dry-land-sprint-start-training-on-the-short-track-speed-skating-start
#14
William B Haug, Eric J Drinkwater, Nicholas J Cicero, J Anthony Barthell, Dale W Chapman
This investigation sought to determine the effects of dry-land sprint start training on short track speed skating (STSS) start performance. Nine highly trained short track athletes completed a control period of normal STSS training followed by a four-week training intervention. Before and after the control and intervention periods, athletes performed three electronically timed dry-land and on-ice 14.43 m maximal sprint start efforts. The intervention consisted of two sprint sessions per week consisting of nine electronically timed 14...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28406104/institutionalized-physical-activity-curriculum-benefits-of-medical-students-in-colombia
#15
Gustavo Tovar, Gabriel López, Milcíades Ibáñez, Ricardo Alvarado, Felipe Lobelo, John Duperly
BACKGROUND: Health authorities internationally have recommended implementing physical activity and exercise for health training programs within the curriculum of medical schools. The purpose of this evaluation was to determine the changes in physical fitness and health (Fitnessgram criteria) of a sports medicine and physical activity course implemented for 3rd year students in a private medical school in Bogotá, Colombia. METHODS: Intervention was targeted to 13 medical student cohorts...
September 2016: Education for Health: Change in Training & Practice
https://www.readbyqxmd.com/read/28387540/n-3-fatty-acid-supplementation-during-4-weeks-of-training-leads-to-improved-anaerobic-endurance-capacity-but-not-maximal-strength-speed-or-power-in-soccer-players
#16
RANDOMIZED CONTROLLED TRIAL
Leyre Gravina, Frankie F Brown, Lee Alexander, James Dick, Gordon Bell, Oliver C Witard, Stuart D R Galloway
Omega-3 fatty acid (n-3 FA) supplementation could promote adaptation to soccer-specific training. We examined the impact of a 4-week period of n-3 FA supplementation during training on adaptations in 1RM knee extensor strength, 20-m sprint speed, vertical jump power, and anaerobic endurance capacity (Yo-Yo test) in competitive soccer players. Twenty six soccer players were randomly assigned to one of two groups: n-3 FA supplementation (n-3 FA; n = 13) or placebo (n = 13). Both groups performed two experimental trial days...
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28103523/anthropogenic-chemical-cues-can-alter-the-swimming-behaviour-of-juvenile-stages-of-a-temperate-fish
#17
Carlos Díaz-Gil, Lucy Cotgrove, Sarah Louise Smee, David Simón-Otegui, Hilmar Hinz, Amalia Grau, Miquel Palmer, Ignacio A Catalán
Human pressure on coastal areas is affecting essential ecosystems including fish nursery habitats. Among these anthropogenic uses, the seasonal increment in the pressure due to leisure activities such as coastal tourism and yachting is an important environmental stressor in many coastal zones. These pressures may elicit understudied impacts due to, for example, sunscreens or other seasonal pollutants. The island of Majorca, northwest Mediterranean Sea, experiences one of the highest number of tourist visits per capita in the world, thus the surrounding coastal habitat is subject to high anthropogenic seasonal stress...
April 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28004133/tail-autotomy-affects-bipedalism-but-not-sprint-performance-in-a-cursorial-mediterranean-lizard
#18
Pantelis Savvides, Maria Stavrou, Panayiotis Pafilis, Spyros Sfenthourakis
Running is essential in all terrestrial animals mainly for finding food and mates and escaping from predators. Lizards employ running in all their everyday functions, among which defense stands out. Besides flight, tail autotomy is another very common antipredatory strategy within most lizard families. The impact of tail loss to sprint performance seems to be species dependent. In some lizard species, tail shedding reduces sprint speed, in other species, increases it, and, in a few species, speed is not affected at all...
February 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/27992260/improvement-of-elite-female-athletes-physical-performance-with-a-3-week-unexpected-disturbance-program
#19
RANDOMIZED CONTROLLED TRIAL
Jorg Teichmann, Edin K Suwarganda, C Martyn Beaven, Kim Hébert-Losier, Jin Wei Lee, Florencio Tenllado Vallejo, Philip Chun Foong Lew, Ramlan Abdul Aziz, Yeo Wee Kian, Dietmar Schmidtbleicher
CONTEXT: Sensorimotor training is commonly used in a rehabilitative setting; however, the effectiveness of an unexpected disturbance program (UDP) to enhance performance measures in uninjured elite athletes is unknown. OBJECTIVE: To assess the impact of a 3-wk UDP program on strength, power, and proprioceptive measures. DESIGN: Matched-group, pre-post design. SETTING: National sport institute. PARTICIPANTS: 21 international-level female field hockey athletes...
January 1, 2018: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27918679/movement-patterns-and-metabolic-responses-during-an-international-rugby-sevens-tournament
#20
Anthony Couderc, Claire Thomas, Mathieu Lacome, Julien Piscione, Julien Robineau, Rémi Delfour-Peyrethon, Rachel Borne, Christine Hanon
PURPOSE: To investigate the running demands and associated metabolic perturbations during an official rugby sevens tournament. METHODS: Twelve elite players participated in 7 matches wearing GPS units. Maximal sprinting speed (MSS) and maximal aerobic speed (MAS) were measured. High-intensity threshold was individualized relative to MAS (>100% of MAS), and very-high-intensity distance was reported relative to both MAS and MSS. Blood samples were taken at rest and after each match...
August 2017: International Journal of Sports Physiology and Performance
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