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https://www.readbyqxmd.com/read/28339350/the-effect-of-initial-knee-angle-on-concentric-only-squat-jump-performance
#1
Lachlan J Mitchell, Christos K Argus, Kristie-Lee Taylor, Jeremy M Sheppard, Dale W Chapman
PURPOSE: There is uncertainty as to which knee angle during a squat jump (SJ) produces maximal jump performance. Importantly, understanding this information will aid in determining appropriate ratios for assessment and monitoring of the explosive characteristics of athletes. METHOD: This study compared SJ performance across different knee angles-90º, 100º, 110º, 120º, 130º, and a self-selected depth-for jump height and other kinetic characteristics. For comparison between SJ and an unconstrained dynamic movement, participants also performed a countermovement jump from a self-selected depth...
March 24, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28332113/the-critical-power-concept-applications-to-sports-performance-with-a-focus-on-intermittent-high-intensity-exercise
#2
REVIEW
Andrew M Jones, Anni Vanhatalo
The curvilinear relationship between power output and the time for which it can be sustained is a fundamental and well-known feature of high-intensity exercise performance. This relationship 'levels off' at a 'critical power' (CP) that separates power outputs that can be sustained with stable values of, for example, muscle phosphocreatine, blood lactate, and pulmonary oxygen uptake ([Formula: see text]), from power outputs where these variables change continuously with time until their respective minimum and maximum values are reached and exercise intolerance occurs...
March 22, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28328719/predicting-the-maximum-dynamic-strength-in-bench-press-the-high-precision-of-the-bar-velocity-approach
#3
Irineu Loturco, Ronaldo Kobal, José E Moraes, Katia Kitamura, César C Cal Abad, Lucas A Pereira, Fábio Y Nakamura
Loturco, I, Kobal, R, Moraes, JE, Kitamura, K, Cal Abad, CC, Pereira, LA, and Nakamura, FY. Predicting the maximum dynamic strength in bench press: the high precision of the bar velocity approach. J Strength Cond Res 31(4): 1127-1131, 2017-The aim of this study was to determine the force-velocity relationship and test the possibility of determining the 1 repetition maximum (1RM) in "free weight" and Smith machine bench presses. Thirty-six male top-level athletes from 3 different sports were submitted to a standardized 1RM bench press assessment (free weight or Smith machine, in randomized order), following standard procedures encompassing lifts performed at 40-100% of 1RM...
April 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28328717/perceived-sleep-quality-mood-states-and-their-relationship-with-performance-among-brazilian-elite-athletes-during-a-competitive-period
#4
Ricardo Brandt, Guilherme G Bevilacqua, Alexandro Andrade
Brandt, R, Bevilacqua, GG, and Andrade, A. Perceived sleep quality, mood states, and their relationship with performance among Brazilian elite athletes during a competitive period. J Strength Cond Res 31(4): 1033-1039, 2017-We described the perceived sleep quality and mood states of elite athletes during a competitive period, and clarified their relationship to athletes' sport performance. Participants were 576 Brazilian elite athletes (404 men and 172 women) of individual and team sports. Mood states were evaluated using the Brunel Mood Scale, whereas perceived sleep quality was evaluated using a single question ("How would you evaluate the quality of your sleep in the last few days?")...
April 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28320567/gender-differences-in-concussion-and-postinjury-cognitive-findings-in-an-older-and-younger-pediatric-population
#5
Sarah Tanveer, Nassim Zecavati, Elizabeth Bronson Delasobera, Temitayo Oyefunmike Oyegbile
BACKGROUND: Studies have documented gender differences associated with concussion. The purpose of this study was to determine if these gender differences are also noted within a pediatric population. METHODS: This prospective study analyzed 1971 patients who had completed preconcussion and postconcussion neuropsychological testing within the Washington, DC, area. RESULTS: Our results showed that children and adolescents with concussion exhibit gender differences with respect to risk factors, recovery, and symptomatology...
February 9, 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/28303895/total-extracellular-small-rna-profiles-from-plasma-saliva-and-urine-of-healthy-subjects
#6
Ashish Yeri, Amanda Courtright, Rebecca Reiman, Elizabeth Carlson, Taylor Beecroft, Alex Janss, Ashley Siniard, Ryan Richholt, Chris Balak, Joel Rozowsky, Robert Kitchen, Elizabeth Hutchins, Joseph Winarta, Roger McCoy, Matthew Anastasi, Seungchan Kim, Matthew Huentelman, Kendall Van Keuren-Jensen
Interest in circulating RNAs for monitoring and diagnosing human health has grown significantly. There are few datasets describing baseline expression levels for total cell-free circulating RNA from healthy control subjects. In this study, total extracellular RNA (exRNA) was isolated and sequenced from 183 plasma samples, 204 urine samples and 46 saliva samples from 55 male college athletes ages 18-25 years. Many participants provided more than one sample, allowing us to investigate variability in an individual's exRNA expression levels over time...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303544/intervention-strategies-used-in-sport-injury-prevention-studies-a-systematic-review-identifying-studies-applying-the-haddon-matrix
#7
REVIEW
Ingrid Vriend, Vincent Gouttebarge, Caroline F Finch, Willem van Mechelen, Evert A L M Verhagen
BACKGROUND: Prevention of sport injuries is crucial to maximise the health and societal benefits of a physically active lifestyle. To strengthen the translation and implementation of the available evidence base on effective preventive measures, a range of potentially relevant strategies should be considered. OBJECTIVE: Our aim was to identify and categorise intervention strategies for the prevention of acute sport injuries evaluated in the scientific literature, applying the Haddon matrix, and identify potential knowledge gaps...
March 16, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28303338/blood-glucose-kinetics-and-physiological-changes-in-a-type-1-diabetic-finisher-of-the-ultraman-triathlon-a-case-study
#8
Christopher W Bach, Daniel A Baur, William S Hyder, Michael J Ormsbee
PURPOSE: To investigate the blood glucose kinetics and physiological effects experienced by a type 1 diabetic (T1D) finisher of a 3-day, multi-stage ultra endurance triathlon consisting of a 10 km swim and 144.8 km bike (stage 1), a 275.4 km bike (stage 2), and an 84.4 km run (stage 3). METHODS: The athlete self-monitored blood glucose (SMBG) levels via fingerstick blood draw and hand-held glucometer. Researchers evaluated blood glucose kinetics via a continuous glucose monitoring device...
March 16, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28296943/new-approaches-to-determine-fatigue-in-elite-athletes-during-intensified-training-resting-metabolic-rate-and-pacing-profile
#9
Amy L Woods, Laura A Garvican-Lewis, Bronwen Lundy, Anthony J Rice, Kevin G Thompson
BACKGROUND: Elite rowers complete a high volume of training across a number of modalities to prepare for competition, including periods of intensified load, which may lead to fatigue and short-term performance decrements. As yet, the influence of substantial fatigue on resting metabolic rate (RMR) and exercise regulation (pacing), and their subsequent utility as monitoring parameters, has not been explicitly investigated in elite endurance athletes. METHOD: Ten National-level rowers completed a four-week period of intensified training...
2017: PloS One
https://www.readbyqxmd.com/read/28282761/gait-variability-and-symmetry-in-world-class-senior-and-junior-race-walkers
#10
Catherine B Tucker, Brian Hanley
The aim of this study was to analyse gait variability and symmetry in race walkers. Eighteen senior and 17 junior athletes race walked on an instrumented treadmill (for 10 km and 5 km, respectively) at speeds equivalent to 103% of season's best time for 20 km and 10 km, respectively. Spatio-temporal and ground reaction force (GRF) data were recorded at 2.5 km, and at 4.5, 6.5 and 8.5 km for a subsection of athletes. Gait variability was measured using median absolute deviation (MAD) whereas inter-leg symmetry was measured using the symmetry angle...
September 22, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28282750/evening-electronic-device-use-the-effects-on-alertness-sleep-and-next-day-physical-performance-in-athletes
#11
Maddison J Jones, Peter Peeling, Brian Dawson, Shona Halson, Joanna Miller, Ian Dunican, Michael Clarke, Carmel Goodman, Peter Eastwood
The aim of the present study was to investigate the influence of different types of tasks performed with or without an electronic device (tablet) on pre-sleep alertness, subsequent sleep quality and next-day athletic performance. Eight highly trained netball players attended a sleep laboratory for pre-sleep testing, polysomnographic sleep monitoring and next-day physical performance testing on 5 separate occasions (1 familiarisation and 4 experimental sessions). For 2 h prior to bedtime, athletes completed cognitively stimulating tasks (puzzles) or passive tasks (reading) with or without a tablet...
February 14, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28281095/a-national-study-on-the-effects-of-concussion-in-collegiate-athletes-and-us-military-service-academy-members-the-ncaa-dod-concussion-assessment-research-and-education-care-consortium-structure-and-methods
#12
Steven P Broglio, Michael McCrea, Thomas McAllister, Jaroslaw Harezlak, Barry Katz, Dallas Hack, Brian Hainline
BACKGROUND: The natural history of mild traumatic brain injury (TBI) or concussion remains poorly defined and no objective biomarker of physiological recovery exists for clinical use. The National Collegiate Athletic Association (NCAA) and the US Department of Defense (DoD) established the Concussion Assessment, Research and Education (CARE) Consortium to study the natural history of clinical and neurobiological recovery after concussion in the service of improved injury prevention, safety and medical care for student-athletes and military personnel...
March 9, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28271802/growth-maturation-and-exercise-during-youth-2016
#13
Jaak Jürimäe
For The Year that Was-2016, I have selected three papers in the area of growth, maturation, and exercise during youth. The year of 2016 was a successful year and it was not an easy task to highlight the most significant publications in this specific area of pediatric exercise science. The first paper has been chosen because it provides, for the first time, the growth and maturational status of elite junior tennis players belonging to the top eight players in the National rankings in various ages and compares against population norms...
February 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28271579/self-reported-sleep-quantity-quality-and-sleep-hygiene-in-elite-athletes
#14
Melanie Knufinke, Arne Nieuwenhuys, Sabine A E Geurts, Anton M L Coenen, Michiel A J Kompier
Sleep is essential for recovery and performance in elite athletes. While actigraphy-based studies revealed suboptimal sleep in athletes, information on their subjective experience of sleep is scarce. Relatively unexplored is also the extent to which athletes' sleep is adversely affected by environmental conditions and daytime behaviours, that is sleep hygiene. This study aimed to provide insight in sleep quantity, quality and its putative association with sleep hygiene. Participants were 98 elite (youth) athletes competing at the highest (inter-)national level...
March 8, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28269460/monitoring-of-paces-and-gaits-using-binary-pir-sensors-with-rehabilitation-treadmill
#15
Jiang Lu, Ting Zhang, Qingquan Sun, Sanobar Kadiwal, Ishaq Unwala, Fei Hu
Recently, rehabilitation treadmills are designed for helping injured persons such as stroke patients and injury athletes in the process of physical therapy. By monitoring the changes of paces and gaits, one can estimate the progress of rehabilitation. At present, most devices that can estimate paces and gaits are wearable and/or expensive. This paper presents an inexpensive, non-intrusive wireless binary sensor system for pace estimation and lower-extreme gait recognition with low data throughput and high energy efficiency...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268857/hrv4training-large-scale-longitudinal-training-load-analysis-in-unconstrained-free-living-settings-using-a-smartphone-application
#16
Marco Altini, Oliver Amft
We describe an approach to support athletes at various fitness levels in their training load analysis using heart rate (HR) and heart rate variability (HRV). A smartphone-based application (HRV4Training) was developed that captures heart activity over one to five minutes using photoplethysmography (PPG) and derives HR and HRV features. HRV4Training integrated a guide for an early morning spot measurement protocol and a questionnaire to capture self-reported training activity. The smartphone application was made publicly available for interested users to quantify training effect...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268724/development-of-a-head-impact-monitoring-intelligent-mouthguard
#17
Daniel S Hedin, Paul L Gibson, Adam J Bartsch, Sergey Samorezov
The authors present the development and laboratory system-level testing of an impact monitoring "Intelligent Mouthguard" intended to help with identification of potentially concussive head impacts and cumulative head impact dosage. The goal of Intelligent Mouthguard is to provide an indicator of potential concussion risk, and help caregiver identify athletes needing sideline concussion protocol testing. Intelligent Mouthguard may also help identify individuals who are at higher risk based on historical dosage...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268423/dynamic-cerebral-autoregulation-in-young-athletes-following-concussion
#18
Kyriaki Kostoglou, Alexander D Wright, Jonathan D Smirl, Kelsey Bryk, Paul van Donkelaar, Georgios D Mitsis
The purpose of this study was to examine cerebral autoregulation (CA) in young athletes experiencing concussion. The subjects were monitored and repeatedly tested 72 hours, 2 weeks and 1 month post-injury. Mean arterial blood pressure (MABP), end-tidal partial pressure of carbon dioxide (PETCO2) and cerebral blood flow velocity (CBFV) in the middle and posterior cerebral arteries were monitored during mental activation paradigms. In order to characterize CA we employed autoregressive models with exogenous inputs (ARX) and impulse response models based on the Laguerre expansion technique (LET)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28253038/monitoring-training-loads-the-past-the-present-and-the-future
#19
Carl Foster, Jose A Rodriguez-Marroyo, Jos J de Koning
Training monitoring is about keeping track of what athletes accomplish in training, for the purpose of improving the interaction between coach and athlete. Over history there have been several basic schemes of training monitoring. In the earliest days training monitoring was about observing the athlete during standard workouts. However, difficulty in standardizing the conditions of training made this process unreliable. With the advent of interval training, monitoring became more systematic. However, imprecision in the measurement of HR evolved interval training toward index workouts, where the main monitored parameter was average time required to complete index workouts...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28253031/the-relationship-between-training-load-and-injury-in-men-s-professional-basketball-players
#20
Kaitlyn J Weiss, Sian V Allen, Mike R McGuigan, Chris S Whatman
PURPOSE: To establish the relationship between the acute:chronic workload ratio and lower extremity overuse injuries in professional basketball players over the course of a competitive season. METHODS: The acute:chronic workload ratio was determined by calculating the sum of the current week's session rate of perceived exertion (sRPE) training load (acute load) and dividing it by the average weekly training load over the previous four weeks (chronic load). All injuries were recorded weekly using a self-reported injury questionnaire (Oslo Sports Trauma Research Centre Injury Questionnaire(20)) Workload ratios were modelled against injury data using a logistic regression model with unique intercepts for each player...
March 2, 2017: International Journal of Sports Physiology and Performance
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