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https://www.readbyqxmd.com/read/28422524/straight-line-and-change-of-direction-intermittent-running-in-professional-soccer-players
#1
Mohamed S Fessi, Fayçal Farhat, Alexandre Dellal, James J Malone, Wassim Moalla
PURPOSE: The present study aimed to investigate the difference between straight-line (STL) and change of direction (COD) intermittent running exercises in soccer players. METHODS: Seventeen male professional soccer players performed the agility T-test and 6 intermittent running exercises: 10s at 130% of maximal aerobic speed (MAS) alternated with 10s of rest (10-10), 15s at 120% of MAS alternated with 15s of rest (15-15) and 30s at 110% of MAS alternated with 30s of rest (30-30) both in STL and with COD...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28416892/anthropometric-and-physical-characteristics-allow-differentiation-of-young-female-volleyball-players-according-to-playing-position-and-level-of-expertise
#2
M Milić, Z Grgantov, K Chamari, L P Ardigò, A Bianco, J Padulo
The aim of our study was to determine the differences in some anthropometric and physical performance variables of young Croatian female volleyball players (aged 13 to 15) in relation to playing position (i.e., independent variable) and performance level within each position (i.e., independent variable). Players were categorized according to playing position (i.e., role) as middle blockers (n=28), opposite hitters (n=41), passer-hitters (n=54), setters (n=30), and liberos (n=28). Within each position, players were divided into a more successful group and a less successful group according to team ranking in the latest regional championship and player quality within the team...
March 2017: Biology of Sport
https://www.readbyqxmd.com/read/28397712/design-of-hair-like-appendages-and-comparative-analysis-on-their-coordination-toward-steady-and-efficient-swimming
#3
Bokeon Kwak, Joonbum Bae
Locomotion of water beetles have been widely studied in biology owing to their remarkable swimming skills. Inspired by the oar-like legs of water beetles, designing a robot that swims under the principle of drag-powered propulsion can lead to highly agile mobility. But its motion can easily be discontinuous and jerky due to backward motions (i.e., retraction) of the legs. Here we proposed novel hair-like appendages and considered their coordination to achieve steady and efficient swimming on the water surface...
April 11, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28368952/physical-determinants-of-division-1-collegiate-basketball-women-s-national-basketball-league-and-women-s-national-basketball-association-athletes-with-reference-to-lower-body-sidedness
#4
Tania Spiteri, Molly Binetti, Aaron T Scanlan, Vincent J Dalbo, Filippo Dolci, Christina Specos
In female basketball the assumed components of success include power, agility, and the proficiency at executing movements using each limb. However, the importance of these attributes in discriminating between playing levels in female basketball have yet to be determined. The purpose of this study was to compare lower body power, change of direction (COD) speed, agility, and lower-body sidedness between basketball athletes participating in Division 1 Collegiate basketball (United States), Women's National Basketball League (WNBL) (Australia), and Women's National Basketball Association (WNBA) (United States)...
March 31, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28345503/physical-fitness-and-shapes-of-subcortical-brain-structures-in-children
#5
Francisco B Ortega, Daniel Campos, Cristina Cadenas-Sanchez, Signe Altmäe, Cristina Martínez-Zaldívar, Miguel Martín-Matillas, Andrés Catena, Cristina Campoy
A few studies have recently reported that higher cardiorespiratory fitness is associated with higher volumes of subcortical brain structures in children. It is, however, unknown how different fitness measures relate to shapes of subcortical brain nuclei. We aimed to examine the association of the main health-related physical fitness components with shapes of subcortical brain structures in a sample of forty-four Spanish children aged 9·7 (sd 0·2) years from the NUtraceuticals for a HEALthier life project...
March 27, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28344461/within-session-sequence-of-balance-and-plyometric-exercises-does-not-affect-training-adaptations-with-youth-soccer-athletes
#6
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/28344446/prediction-of-tennis-performance-in-junior-elite-tennis-players
#7
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/28323803/patient-response-to-an-integrated-orthotic-and-rehabilitation-initiative-for-traumatic-injuries-the-prioriti-mtf-study
#8
Joseph R Hsu, Johnny G Owens, Jennifer DeSanto, John R Fergason, Kevin M Kuhn, Benjamin K Potter, Daniel J Stinner, Robert G Sheu, Sandra L Waggoner, Jason M Wilken, Yanjie Huang, Daniel O Scharfstein, Ellen J MacKenzie
Although limb salvage is now possible for many high-energy open fractures and crush injuries to the distal tibia, ankle, hindfoot, and midfoot, orthotic options are limited. The Intrepid Dynamic Exoskeletal Orthosis (IDEO) is a custom, energy-storing carbon fiber orthosis developed for trauma patients undergoing limb salvage. The IDEO differs from other orthoses in that it allows patients with ankle weakness to have more normal ankle biomechanics and increased ankle power. This article describes the design of a study to evaluate the effectiveness of the IDEO when delivered together with a high-intensity, sports medicine-based approach to rehabilitation...
April 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28315285/effects-of-plyometric-training-on-physical-fitness-in-prepuberal-soccer-athletes
#9
Yassine Negra, Helmi Chaabene, Senda Sammoud, Raja Bouguezzi, Mohamed Aymen Abbes, Younés Hachana, Urs Granacher
This study aimed at examining the effects of plyometric training on stable (SPT) vs. unstable (UPT) surfaces on physical fitness in prepuberal soccer players. Male athletes were randomly assigned to SPT (n=18; age=12.7±0.2 years) or UPT (n=16; age=12.2±0.5 years). Both groups conducted 3 regular soccer training sessions per week combined with either 2 SPT or UPT sessions. Assessment of jumping ability (countermovement jump [CMJ], and standing long jump [SLJ]), speed (10-m, 20-m, 30-m sprint), agility (Illinois agility test [IAT]), and balance (stable [SSBT], unstable [USBT] stork balance test; stable [SYBT], unstable [UYBT] Y balance test) was conducted pre-and post-training...
March 17, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28264903/longitudinal-quasi-static-stability-predicts-changes-in-dog-gait-on-rough-terrain
#10
Simon Wilshin, Michelle A Reeve, G Clark Haynes, Shai Revzen, Daniel E Koditschek, Andrew J Spence
Legged animals utilize gait selection to move effectively and must re-cover from environmental perturbations. We show that on rough terrain domestic dogs, Canis lupus familiaris, spend more time in longitudinal quasi-statically stable patterns of movement. Here longitudinal refers to the rostro-caudal, axis. We used an existing model in the literature to quantify the longitudinal quasi-static stability of gaits neighbouring the walk, and found that trot-like gaits are more stable. We thus hypothesized that when perturbed, the rate of return to a stable gait would depend on the direction of perturbation, such that perturbations towards less quasi-statically stable patterns of movement would be more rapid than those towards more stable patterns of movement...
March 6, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28263670/proximal-neuromuscular-control-protects-against-hamstring-injuries-in-male-soccer-players
#11
Joke Schuermans, Lieven Danneels, Damien Van Tiggelen, Tanneke Palmans, Erik Witvrouw
BACKGROUND: With their unremittingly high incidence rate and detrimental functional repercussions, hamstring injuries remain a substantial problem in male soccer. Proximal neuromuscular control ("core stability") is considered to be of key importance in primary and secondary hamstring injury prevention, although scientific evidence and insights on the exact nature of the core-hamstring association are nonexistent at present. HYPOTHESIS: The muscle activation pattern throughout the running cycle would not differ between participants based on injury occurrence during follow-up...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28231260/effects-of-the-skills4genius-sports-based-training-program-in-creative-behavior
#12
Sara Santos, Sergio Jiménez, Jaime Sampaio, Nuno Leite
Team Sports has been suggested as a suitable environment to investigate creative behavior. This study's purpose was two-fold: first, it intended to identify the effects of the Skills4Genius sports-bases training program in thinking, motor, and in-game creative behavior in team sports. Second, it aimed to investigate the relationship between creative thinking and in-game creativity. Forty children from primary school were allocated into control (n = 18, age: 9.2±0.4) and experimental (n = 22, age: 9.5±0.7) groups...
2017: PloS One
https://www.readbyqxmd.com/read/28211843/performance-and-metabolic-demand-of-a-new-repeated-sprint-ability-test-in-basketball-players-does-the-number-of-changes-of-direction-matter
#13
Alessandro M Zagatto, Luca P Ardigò, Fabio A Barbieri, Fabio Milioni, Antonio Dello Iacono, Bruno H F Camargo, Johnny Padulo
This study compared two repeated-sprint ability tests in basketball players. Both tests included 10×30-m sprints, with the difference that the previously validated test (RSA2COD) featured two changes of direction (COD) per sprint, while the experimental test (RSA5COD) featured five CODs per sprint. Tests` performances and metabolic demands were specifically assessed in 20 basketball players. Firstly, RSA5COD test-retest reliability was investigated. Then RSA2COD, RSA5COD sprint times, peak speeds, oxygen uptake (VO2) and post-test blood lactate concentration [La] were measured...
November 5, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28205417/muscle-activation-and-heart-rate-responses-to-a-side-step-interval-exercise
#14
Robert S Thiebaud, Takashi Abe, Jonathan C Bravo, Nicolas Giovannitti, Avery P Sullivan
BACKGROUND: The side-step test is commonly used to assess agility. Side-step interval exercise may also be a potential way to improve cardiorespiratory and muscular fitness. However, the acute heart rate and muscle activation response to this type of exercise is not well established. In addition, different tempos can influence these responses. The purpose of this study was to determine the acute heart rate and muscle activation responses of a side-step interval exercise to different exercise tempos...
February 16, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28193269/how-flies-are-flirting-on-the-fly
#15
Courtney Eichorn, Michael Hrabar, Emma C Van Ryn, Bekka S Brodie, Adam J Blake, Gerhard Gries
BACKGROUND: Flies have some of the most elaborate visual systems in the Insecta, often featuring large, sexually dimorphic eyes with specialized "bright zones" that may have a functional role during mate-seeking behavior. The fast visual system of flies is considered to be an adaptation in support of their advanced flight abilities. Here, we show that the immense processing speed of the flies' photoreceptors plays a crucial role in mate recognition. RESULTS: Video-recording wing movements of abdomen-mounted common green bottle flies, Lucilia sericata, under direct light at 15,000 frames per second revealed that wing movements produce a single, reflected light flash per wing beat...
February 14, 2017: BMC Biology
https://www.readbyqxmd.com/read/28186497/agility-in-young-athletes-is-it-a-different-ability-from-speed-and-power
#16
Yassine Negra, Helmi Chaabene, Mehréz Hammami, Samiha Amara, Senda Sammoud, Bessem Mkaouer, Younés Hachana
Negra, Y, Chaabene, H, Hammami, M, Amara, S, Sammoud, S, Mkaouer, B, and Hachana, Y. Agility in young athletes: is it a different ability from speed and power? J Strength Cond Res 31(3): 727-735, 2017-Agility is an important physical attribute for successful participation in team sports events. Illinois agility test (IAT) and T-test have been widely used within adult team sports players to assess agility performance. The purposes of this investigation are (a) to study the reliability and the sensitivity of both IAT and T-test scores and (b) to explore to what extend the agility is an independent physical ability from speed time and jumping ability...
March 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28176405/deficits-in-anthropometric-indices-of-nutritional-status-and-motor-performance-among-low-birth-weight-children-from-maputo-city-mozambique
#17
Mario Eugénio Tchamo, Marcos André Moura-Dos-Santos, Fernanda Karina Dos Santos, António Prista, Carol Góis Leandro
OBJECTIVE: To evaluate associations between low birth weight (LBW) and anthropometry, body composition, physical fitness, and gross motor coordination among schoolchildren from Maputo, Mozambique. METHODS: A total of 353 children aged 7 to 10 years old from both genders born in Maputo (Mozambique) were sampled. The sample was divided into two groups: LBW (n = 155) and normal birth weight (NBW, n = 198). Body composition measurements and indices weight-for-age, height-for-age, and weight-for-height were assessed...
February 8, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28169148/risk-factors-that-predict-severe-injuries-in-university-rugby-sevens-players
#18
Rezvan Mirsafaei Rizi, Simon S Yeung, Nathan J Stewart, Ella W Yeung
OBJECTIVES: To investigate injury incidence and the influence of physical fitness parameters on the risk of severe injuries in players on rugby sevens university teams. DESIGN: Prospective cohort study. METHODS: Rugby players from three universities (N=104; 90M:14F; 20.6±1.9years) were recruited before the beginning of the season. Players underwent pre-season assessments of power, strength, speed, agility, endurance, stability, and flexibility...
January 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28167806/turning-performance-of-brief-squid-lolliguncula-brevis-during-attacks-on-shrimp-and-fish
#19
Rachel Jastrebsky, Ian Bartol, Paul Krueger
Although squid are generally considered to be effective predators, little is currently known quantitatively about how squid maneuver and position themselves during prey strikes. In this study, high-speed video and kinematic analyses were used to study attacks by brief squid Lolliguncula brevis on both shrimp and fish. Squid attack success was high (>80%) and three behavioral phases were identified: (1) approach, (2) strike and (3) recoil. Lolliguncula brevis demonstrated greater maneuverability (i.e., a smaller length-specific turning radius) and employed more body adjustments (i...
February 6, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28166184/postactivation-potentiation-and-change-of-direction-speed-in-elite-academy-rugby-players
#20
Chris Bishop, Anthony N Turner, Jon Cree, Sean Maloney, James Marshall, Paul Jarvis
This study investigated the effect of preceding pro-agility sprints with maximal isometric squats to determine if postactivation potentiation (PAP) could be harnessed in change of direction speed. Sixteen elite under-17 rugby union players (age: 16 ± 0.41yrs; body mass: 88.7 ± 12.1kg, height: 1.83 ± 0.07m) from an Aviva Premiership rugby club were tested. Subjects performed a change of direction specific warm-up, followed by two baseline pro-agility tests. After 10 minutes recovery, 3 x 3-second maximal isometric squats with a 2 minute recovery between sets were completed as a conditioning activity (CA) on a force plate where peak force and mean rate of force development over 300 milliseconds were measured...
February 1, 2017: Journal of Strength and Conditioning Research
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