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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
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
https://www.readbyqxmd.com/read/28149421/physical-characteristics-of-elite-adolescent-female-basketball-players-and-their-relationship-to-match-performance
#9
Azahara Fort-Vanmeerhaeghe, Alicia Montalvo, Alexander Latinjak, Viswanath Unnithan
There were two aims of this study: first, to investigate physical fitness and match performance differences between under-16 (U16) and under-18 (U18) female basketball players, and second, to evaluate the relationship between physical fitness and game-related performances. Twenty-three young, female, elite Spanish basketball players (16.2 1.2 years) participated in the study. The sample was divided into two groups: U16 and U18 players. The average scores from pre- and post-season physical fitness measurements were used for subsequent analyses...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149399/a-systematic-review-of-the-main-factors-that-determine-agility-in-sport-using-structural-equation-modeling
#10
Vladimir Hojka, Petr Stastny, Tomas Rehak, Artur Gołas, Aleksandra Mostowik, Marek Zawart, Martin Musálek
While tests of basic motor abilities such as speed, maximum strength or endurance are well recognized, testing of complex motor functions such as agility remains unresolved in current literature. Therefore, the aim of this review was to evaluate which main factor or factor structures quantitatively determine agility. In methodological detail, this review focused on research that explained or described the relationships between latent variables in a factorial model of agility using approaches such as principal component analysis, factor analysis and structural equation modeling...
September 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149358/muscle-strength-and-speed-performance-in-youth-soccer-players
#11
Luis Peñailillo, Francisco Espíldora, Sebastián Jannas-Vela, Iñigo Mujika, Hermann Zbinden-Foncea
This study aimed to examine the relationship between maximum leg extension strength and sprinting performance in youth elite male soccer players. Sixty-three youth players (12.5 ± 1.3 years) performed 5 m, flying 15 m and 20 m sprint tests and a zigzag agility test on a grass field using timing gates. Two days later, subjects performed a one-repetition maximum leg extension test (79.3 ± 26.9 kg). Weak to strong correlations were found between leg extension strength and the time to perform 5 m (r = -0.39, p = 0...
April 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28145412/hydraulic-hydrogel-actuators-and-robots-optically-and-sonically-camouflaged-in-water
#12
Hyunwoo Yuk, Shaoting Lin, Chu Ma, Mahdi Takaffoli, Nicolas X Fang, Xuanhe Zhao
Sea animals such as leptocephali develop tissues and organs composed of active transparent hydrogels to achieve agile motions and natural camouflage in water. Hydrogel-based actuators that can imitate the capabilities of leptocephali will enable new applications in diverse fields. However, existing hydrogel actuators, mostly osmotic-driven, are intrinsically low-speed and/or low-force; and their camouflage capabilities have not been explored. Here we show that hydraulic actuations of hydrogels with designed structures and properties can give soft actuators and robots that are high-speed, high-force, and optically and sonically camouflaged in water...
February 1, 2017: Nature Communications
https://www.readbyqxmd.com/read/28129280/reliability-of-a-field-test-of-defending-and-attacking-agility-in-australian-football-and-relationships-to-reactive-strength
#13
Warren B Young, Mitch P Murray
Young, WB and Murray, MP. Reliability of a field test of defending and attacking agility in Australian football and relationships to reactive strength. J Strength Cond Res 31(2): 509-516, 2017-Defending and attacking agility tests for Australian football do not exist, and it is unknown whether any physical qualities correlate with these types of agility. The purposes of this study were to develop new field tests of defending and attacking agility for Australian Rules football, to determine whether they were reliable, and to describe the relationship between the agility tests to determine their specificity...
February 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28119883/the-relationship-between-the-behavior-problems-and-motor-skills-of-students-with-intellectual-disability
#14
Yangchool Lee, Bogja Jeoung
The purpose of this study was to determine the relationship between the motor skills and the behavior problems of students with intellectual disabilities. The study participants were 117 students with intellectual disabilities who were between 7 and 25 years old (male, n=79; female, n=38) and attending special education schools in South Korea. Motor skill abilities were assessed by using the second version of the Bruininks-Oseretsky test of motor proficiency, which includes subtests in fine motor control, manual coordination, body coordination, strength, and agility...
December 2016: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28117769/a-robotic-platform-to-study-the-foreflipper-of-the-california-sea-lion
#15
Aditya A Kulkarni, Rahi K Patel, Chen Friedman, Megan C Leftwich
The California sea lion (Zalophus californianus), is an agile and powerful swimmer. Unlike many successful swimmers (dolphins, tuna), they generate most of their thrust with their large foreflippers. This protocol describes a robotic platform designed to study the hydrodynamic performance of the swimming California sea lion (Zalophus californianus). The robot is a model of the animal's foreflipper that is actuated by motors to replicate the motion of its propulsive stroke (the 'clap'). The kinematics of the sea lion's propulsive stroke are extracted from video data of unmarked, non-research sea lions at the Smithsonian Zoological Park (SNZ)...
January 10, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28116111/a-review-of-the-physiological-and-psychological-health-and-wellbeing-of-naval-service-personnel-and-the-modalities-used-for-monitoring
#16
REVIEW
Cliodhna Sargent, Cormac Gebruers, Jim O'Mahony
Naval cohorts rely heavily on personnel to ensure the efficient running of naval organisations. As such, the wellbeing of personnel is essential. In an occupational setting, naval service personnel experience a variety of physiological and psychological stressors. Most naval services arrange annual physical fitness and body composition tests to ensure the physical readiness of personnel. However, these tests only evaluate a small amount of physiological capabilities. Components such as aerobic and strength capabilities are assessed, however, other components of physical fitness such as speed, agility, anaerobic capacity and flexibility are not...
2017: Military Medical Research
https://www.readbyqxmd.com/read/28108267/fitness-and-fatness-in-relation-with-attention-capacity-in-european-adolescents-the-helena-study
#17
Cristina Cadenas-Sanchez, Jeremy Vanhelst, Jonatan R Ruiz, Ruth Castillo-Gualda, Lars Libuda, Idoia Labayen, Pilar De Miguel-Etayo, Ascensión Marcos, Eszter Molnár, Andrés Catena, Luis A Moreno, Michael Sjöström, Frederic Gottrand, Kurt Widhalm, Francisco B Ortega
OBJECTIVES: To examine the association of health-related physical fitness components and accurate measures of fatness with attention in European adolescents. DESIGN: Cross-sectional study. METHODS: A sub-sample of 444 adolescents from the HELENA study (14.5±1.2years) from 6 different countries participated in this study. Adolescents underwent evaluations of fitness (20m shuttle run, handgrip strength, standing long jump and 4×10m shuttle run tests), fatness (body mass index, skinfold thicknesses, bioelectrical impedance, Bod Pod and dual-energy X-ray absorptiometry) and attention (d2-test)...
August 9, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28056914/effects-of-a-school-based-intervention-on-active-commuting-to-school-and-health-related-fitness
#18
Emilio Villa-González, Jonatan R Ruiz, Jason A Mendoza, Palma Chillón
BACKGROUND: Active commuting to school has declined over time, and interventions are needed to reverse this trend. The main objective was to investigate the effects of a school-based intervention on active commuting to school and health-related fitness in school-age children of Southern Spain. METHODS: A total of 494 children aged 8 to 11 years were invited to participate in the study. The schools were non-randomly allocated (i.e., school level allocation) into the experimental group (EG) or the control group (CG)...
January 5, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28056567/development-of-a-fast-lean-and-agile-direct-pelletization-process-using-experimental-design-techniques
#19
Stavros N Politis, Dimitrios M Rekkas
A novel hot melt direct pelletization method was developed, characterized and optimized, using statistical thinking and experimental design tools. Mixtures of carnauba wax (CW) and HPMC K100M were spheronized using melted gelucire 50-13 as a binding material (BM). Experimentation was performed sequentially; a fractional factorial design was set up initially to screen the factors affecting the process, namely spray rate, quantity of BM, rotor speed, type of rotor disk, lubricant-glidant presence, additional spheronization time, powder feeding rate and quantity...
April 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/28025086/exercise-training-on-skill-related-physical-fitness-in-adolescents-with-intellectual-disability-a-systematic-review-and-meta-analysis
#20
REVIEW
Shiau-Chian Jeng, Chia-Wei Chang, Wen-Yu Liu, Yu-Jen Hou, Yang-Hua Lin
BACKGROUND: Skill-related fitness (SRF) is a component of physical fitness related to sports or occupational performance. Adolescents with intellectual disability (ID) can take advantage of SRF for enhancing work performance and enjoying participation with peers in leisure activities. However, few studies have examined the benefits of exercise on SRF in adolescents with ID. OBJECTIVE: This study synthesized the results from the reviewed studies and determined whether exercise training improves SRF in adolescents with ID...
December 19, 2016: Disability and Health Journal
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