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https://www.readbyqxmd.com/read/27918677/a-comparison-of-isometric-mid-thigh-pull-strength-vertical-jump-sprint-speed-and-change-of-direction-speed-in-academy-netball-players
#1
Christopher Thomas, Paul Comfort, Paul A Jones, Thomas Dos'Santos
PURPOSE: To investigate (a) the relationships between maximal isometric strength, vertical jump (VJ), sprint speed, and change of direction speed (CODS) in academy netball players, and (b) determine whether players who have high performance in isometric strength testing would demonstrate superior performance in VJ, sprint speed, and CODS measures. METHODS: Twenty-six young female netball players (age = 16.1 ± 1.2 years; height = 173.9 ± 5.7 cm; body mass = 66...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918670/combined-plyometric-strength-training-improves-ice-hockey-players-on-ice-sprint
#2
Torstein E Dæhlin, Ole C Haugen, Simen Haugerud, Ivana Hollan, Truls Raastad, Bent R Rønnestad
: Combined plyometric and strength training have previously been suggested as a strategy to improve skating performance in ice hockey players. However, the effects of combined plyometric and strength training has not been previously been compared to the effects of strength training only. PURPOSE: To compare the effects of combined plyometric and strength training on ice hockey players' skating sprint performance with strength training only. METHODS: Eighteen participants were randomly assigned to two groups that completed 5 strength-training sessions per week for 8 weeks...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918668/the-influence-of-changes-in-acute-training-load-on-daily-sensitivity-of-morning-measured-fatigue-variables-in-elite-soccer-players
#3
Robin T Thorpe, Anthony J Strudwick, Martin Buchheit, Greg Atkinson, Barry Drust, Warren Gregson
PURPOSE: To determine the sensitivity of a range of potential fatigue measures to daily training load accumulated over the previous two, three and four days during a short in-season competitive period in elite senior soccer players (n=10). METHODS: Total high-speed running distance, perceived ratings of wellness (fatigue, muscle soreness, sleep quality), counter-movement jump height (CMJ), submaximal heart rate (HRex), post-exercise heart rate recovery (HRR) and heart rate variability (HRV: Ln rMSSD) were analysed during an in-season competitive period (17 days)...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918240/circadian-rhythm-effect-on-physical-tennis-performance-in-trained-male-players
#4
Álvaro López-Samanes, Diego Moreno-Pérez, José L Maté-Muñoz, Raúl Domínguez, Jesús G Pallarés, Ricardo Mora-Rodriguez, Juan F Ortega
To determine the effect of circadian rhythm on neuromuscular responses and kinematics related to physical tennis performance, after a standardised warm-up, 13 highly competitive male tennis players were tested twice for serve velocity/accuracy (SVA), countermovement vertical jump (CMJ), isometric handgrip strength (IS), agility T-test (AGIL) and a 10-m sprint (10-m RUN). In a randomised, counter-balance order, tennis players underwent the test battery twice, either in the morning (i.e., AM; 9:00 h) and in the afternoon (i...
December 5, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27904797/preseason-jump-and-hop-measures-in-male-collegiate-basketball-players-an-epidemiologic-report
#5
Jason Brumitt, Amy Engilis, Dale Isaak, Amy Briggs, Alma Mattocks
BACKGROUND: Injuries are inherent in basketball with lower extremity (LE) injury rates reported as high as 11.6 per 1000 athletic exposures (AEs); many of these injuries result in time loss from sport participation. A recent trend in sports medicine research has been the attempt to identify athletes who may be at risk for injury based on measures of preseason fitness. HYPOTHESIS/PURPOSE: The purpose of this prospective cohort study was to determine if the standing long jump (SLJ) and/or the single-leg hop (SLH) for distance functional performance tests (FPT) are associated with non-contact time loss lower quadrant (LQ, defined as lower extremities or low back) injury in collegiate male basketball players...
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27904796/functional-hop-tests-and-tuck-jump-assessment-scores-between-female-division-i-collegiate-athletes-participating-in-high-versus-low-acl-injury-prone-sports-a-cross-sectional-analysis
#6
Philipp Hoog, Meghan Warren, Craig A Smith, Nicole J Chimera
BACKGROUND: Although functional tests including the single leg hop (SLH), triple hop (TH), cross over hop (COH) for distance, and the tuck jump assessment (TJA) are used for return to play (RTP) criteria for post anterior cruciate ligament (ACL) injury, sport-specific baseline measurements are limited. PURPOSE: The purpose of this study was to examine differences in SLH, TH, and COH distance and limb symmetry index (LSI), as well as total scores, number of jumps, and individual flaws of the TJA in 97 injury-free Division I (DI) collegiate female student athletes participating in ACL injury prone vs...
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27900175/free-fall-acrobatics-to-reduce-neck-loads-during-parachute-opening-shock-evaluation-of-an-intervention-acropose
#7
Anton Westman, Björn O Äng
INTRODUCTION: Neck pain is a widespread health problem in the skydiver athlete population, epidemiologically linked to repeated exposure to parachute opening shock (POS). During POS, a parachutist is subjected to considerable deceleration forces. This study aims to evaluate the use of preventive free fall acrobatics to reduce the biomechanical load on the neck of parachutists during parachute opening. METHODS AND ANALYSIS: Interventional study with a cross-over, within-subject, repeated measures design...
2016: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/27894973/is-there-nothing-new-under-the-sun-the-influence-of-herbals-and-pharmacopoeias-on-ethnobotanical-traditions-in-albacete-spain
#8
Diego Rivera, Alonso Verde, Concepción Obón, Francisco Alcaraz, Candelaria Moreno, Teresa Egea, José Fajardo, José Antonio Palazón, Arturo Valdés, Maria Adele Signorini, Piero Bruschi
ETHNOPHARMACOLOGICAL RELEVANCE: This paper has two overarching aims: (1) presenting the results of studying the Albacete tariff of medicines of 1526 and (2) broadly analyzing the origin and influences of medicinal traditional knowledge in the region of Albacete, Spain. We use historical and modern literature that may have influenced this knowledge. Our primary goal was to determine the ingredients used in the pharmacy in the 16th century CE in Albacete through the analysis of the tariff, and our secondary goal was to investigate until when ingredients and uses present in pharmacy and herbals persisted in later periods...
November 25, 2016: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/27886590/pelvic-floor-dynamics-during-high-impact-athletic-activities-a-computational-modeling-study
#9
Nicholas Dias, Yun Peng, Rose Khavari, Nissrine A Nakib, Robert M Sweet, Gerald W Timm, Arthur G Erdman, Timothy B Boone, Yingchun Zhang
BACKGROUND: Stress urinary incontinence is a significant problem in young female athletes, but the pathophysiology remains unclear because of the limited knowledge of the pelvic floor support function and limited capability of currently available assessment tools. The aim of our study is to develop an advanced computer modeling tool to better understand the dynamics of the internal pelvic floor during highly transient athletic activities. METHODS: Apelvic model was developed based on high-resolution MRI scans of a healthy nulliparous young female...
November 18, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27882617/heritability-estimates-of-muscle-strength-related-phenotypes-a-systematic-review-and-meta-analysis
#10
H Zempo, E Miyamoto-Mikami, N Kikuchi, N Fuku, M Miyachi, H Murakami
The purpose of this study was to clarify the heritability estimates of human muscle strength-related phenotypes (H(2) -msp). A systematic literature search was conducted using PubMed (through August 22, 2016). Studies reporting the H(2) -msp for healthy subjects in a sedentary state were included. Random-effects models were used to calculate the weighted mean heritability estimates. Moreover, subgroup analyses were performed based on phenotypic categories (eg, grip strength, isotonic strength, jumping ability)...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27882600/muscular-fitness-and-metabolic-and-inflammatory-biomarkers-in-adolescents-results-from-labmed-physical-activity-study
#11
C A Agostinis-Sobrinho, C Moreira, S Abreu, L Lopes, L B Sardinha, J Oliveira-Santos, A Oliveira, J Mota, R Santos
This study aimed to evaluate the associations between muscular fitness and inflammatory biomarkers and to investigate the relationship between muscular fitness and selected clustered inflammatory biomarkers in adolescents. This is a cross-sectional analysis with 529 adolescents (267 girls) aged 12-18 years. Handgrip strength and standing long jump tests assessed MF. Continuous scores of clustered inflammatory biomarkers (sum of Z-scores of C-reactive protein [CRP], C3, C4, fibrinogen, and leptin); metabolic risk factor (MRF) score (sum of Z-scores of SBP, triglycerides, ratio total cholesterol [TC]/HDL, HOMA-IR, and waist circumference [WC]) were computed...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27881413/the-drosophila-indirect-flight-muscle-myosin-heavy-chain-isoform-is-insufficient-to-transform-the-jump-muscle-into-a-highly-stretch-activated-muscle-type
#12
Cuiping Zhao, Douglas M Swank
Stretch activation (SA) is a delayed increase in force that enables high power and efficiency from a cyclically contracting muscle. SA exists in various degrees in almost all muscle types. In Drosophila, the indirect flight muscle (IFM) displays exceptionally high SA force production (FSA), whereas the jump muscle produces only minimal FSA We previously found that expressing an embryonic (EMB) myosin heavy chain (MHC) isoform in the jump muscle transforms it into a moderately SA muscle type and enables positive cyclical power generation...
November 23, 2016: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/27877843/thermally-conductive-polyamide-6-carbon-filler-composites-based-on-a-hybrid-filler-system
#13
Sung Min Ha, O Hwan Kwon, Yu Gyeong Oh, Yong Seok Kim, Sung-Goo Lee, Jong Chan Won, Kwang Soo Cho, Byoung Gak Kim, Youngjae Yoo
We explored the use of a hybrid filler consisting of graphite nanoplatelets (GNPs) and single walled carbon nanotubes (SWCNTs) in a polyamide 6 (PA 6) matrix. The composites containing PA 6, powdered GNP, and SWCNT were melt-processed and the effect of filler content in the single filler and hybrid filler systems on the thermal conductivity of the composites was examined. The thermal diffusivities of the composites were measured by the standard laser flash method. Composites containing the hybrid filler system showed enhanced thermal conductivity with values as high as 8...
December 2015: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27876280/validity-and-intra-rater-reliability-of-myjump-app-on-iphone-6s-in-jump-performance
#14
Robert Stanton, Sally-Anne Wintour, Crystal O Kean
OBJECTIVES: Smartphone applications are increasingly used by researchers, coaches, athletes and clinicians. The aim of this study was to examine the concurrent validity and intra-rater reliability of the smartphone-based application, MyJump, against laboratory-based force plate measurements. DESIGN: Cross sectional study. METHODS: Participants completed counter-movement jumps (CMJ) (n=29) and 30cm drop jumps (DJ) (n=27) on a force plate which were simultaneously recorded using MyJump...
November 11, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27874298/volitional-spine-stabilization-during-a-drop-vertical-jump-from-different-landing-heights-implications-for-anterior-cruciate-ligament-injury
#15
Ram Haddas, Troy Hooper, C Roger James, Phillip S Sizer
CONTEXT:  Volitional spine stabilization (VSS) during dynamic activities may alter trunk motion, but the role of the core musculature in positioning the trunk during landing tasks is unclear. OBJECTIVE:  To determine whether volitional core-muscle activation incorporated during a drop vertical jump alters lower extremity kinematics and kinetics, as well as trunk and lower extremity muscle activity at different landing heights. DESIGN:  Controlled laboratory study...
November 22, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27872795/heterogeneous-autoregressive-model-with-structural-break-using-nearest-neighbor-truncation-volatility-estimators-for-dax
#16
Wen Cheong Chin, Min Cherng Lee, Grace Lee Ching Yap
High frequency financial data modelling has become one of the important research areas in the field of financial econometrics. However, the possible structural break in volatile financial time series often trigger inconsistency issue in volatility estimation. In this study, we propose a structural break heavy-tailed heterogeneous autoregressive (HAR) volatility econometric model with the enhancement of jump-robust estimators. The breakpoints in the volatility are captured by dummy variables after the detection by Bai-Perron sequential multi breakpoints procedure...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27871652/epidemiology-and-diagnosis-of-anterior-cruciate-ligament-injuries
#17
REVIEW
Christopher C Kaeding, Benjamin Léger-St-Jean, Robert A Magnussen
Anterior cruciate ligament (ACL) injuries are increasingly common in the United States. This may be related to the increase in high school sports participation, particularly in female athletes. A significant proportion of these injuries are caused by noncontact mechanisms. The incidence of these noncontact injuries may be significantly reduced by enrolling young athletes in jump-training programs. The diagnosis of ACL injuries involves a focused history and physical examination, which can provide a high index of suspicion...
January 2017: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/27869529/low-fundamental-movement-skill-proficiency-is-associated-with-high-bmi-and-body-fatness-in-girls-but-not-boys-aged-6-11-years-old
#18
Michael J Duncan, Elizabeth Bryant, David Stodden
This study examined differences in children's body mass index (BMI) and body fatness (BF%) as a function of gender and fundamental movement skill (FMS) proficiency. Following ethics approval and parental consent, 248, 6-11 year-old children (112 boys, 136 girls) underwent assessment of 7 FMS: sprint run, side gallop, hop, kick, catch, throw and vertical jump. FMS tertiles ("high", "medium" or "low" FMS) were created based on the summed components of the FMS. Skinfold measures were used to calculate BF%. Physical activity (PA) was assessed using pedometry and maturation predicted using anthropometry...
November 21, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27865349/whey-protein-increases-muscle-weight-gain-through-inhibition-of-oxidative-effects-induced-by-resistance-exercise-in-rats
#19
Kely R Teixeira, Marcelo E Silva, Wanderson G de Lima, Maria L Pedrosa, Fabiano K Haraguchi
Whey protein (WP) is known for its nutritional value and antioxidant properties. The aim of this study was to evaluate whether the antioxidant properties of WP could contribute to muscle weight gain in response to resistance exercise (RE). We hypothesized that WP ingestion could increase muscle weight gain in rats subjected to an RE program, through inhibition of oxidative effects induced by high-intensity RE. Thirty-two male Fischer rats were randomly assigned to control sedentary, control exercised, WP sedentary, and WP exercised groups (n=8/group)...
October 2016: Nutrition Research
https://www.readbyqxmd.com/read/27857692/endurance-training-intensity-does-not-mediate-interference-to-maximal-lower-body-strength-gain-during-short-term-concurrent-training
#20
Jackson J Fyfe, Jonathan D Bartlett, Erik D Hanson, Nigel K Stepto, David J Bishop
We determined the effect of concurrent training incorporating either high-intensity interval training (HIT) or moderate-intensity continuous training (MICT) on maximal strength, counter-movement jump (CMJ) performance, and body composition adaptations, compared with single-mode resistance training (RT). Twenty-three recreationally-active males (mean ± SD: age, 29.6 ± 5.5 y; [Formula: see text], 44 ± 11 mL kg(-1)·min(-1)) underwent 8 weeks (3 sessions·wk(-1)) of either: (1) HIT combined with RT (HIT+RT group, n = 8), (2) work-matched MICT combined with RT (MICT+RT group, n = 7), or (3) RT performed alone (RT group, n = 8)...
2016: Frontiers in Physiology
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