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Medicine and Science in Sports and Exercise

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https://www.readbyqxmd.com/read/28079648/acute-response-of-the-infraspinatus-and-biceps-tendons-to-pitching-in-youth-baseball
#1
Adam Popchak, Nathan Hogaboom, Dharmesh Vyas, John Abt, Anthony Delitto, James J Irrgang, Michael Boninger
PURPOSE: Youth baseball frequently results in repetitive strain injuries. Quantitative ultrasound allows real-time imaging with the ability to identify acute markers of tendon change. The study objective was to determine acute quantitative ultrasound changes in the long head of the biceps and infraspinatus tendons of the throwing and non-throwing shoulders during a pitching performance. We hypothesized the tendons of the pitching arm would exhibit an increased width and decreased echogenicity after pitching and that tendons of the non-pitching arm would not demonstrate such changes...
January 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28079707/effect-of-number-of-sprints-in-a-sit-session-on-change-in-vo2max-a-meta-analysis
#2
Niels Bj Vollaard, Richard S Metcalfe, Sean Williams
PURPOSE: Recent meta-analyses indicate that sprint interval training (SIT) improves cardiorespiratory fitness (V[Combining Dot Above]O2max), but the effects of various training parameters on the magnitude of the improvement remain unknown. The present meta-analysis examined the modifying effect of the number of sprint repetitions in a SIT session on improvements in V[Combining Dot Above]O2max. METHODS: The databases PubMed and Web of Science were searched for original studies that have examined pre- and post-training V[Combining Dot Above]O2max in adults following ≥2 weeks of training consisting of repeated (≥2) Wingate-type cycle sprints, published up to 1 May 2016...
January 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28079706/ibuprofen-before-exercise-does-not-prevent-cortical-bone-adaptations-to-training
#3
Vanessa D Sherk, R Dana Carpenter, Erin D Giles, Janine A Higgins, Robera M Oljira, Ginger C Johnson, Samuel Mills, Paul S MacLean
: Using a nonsteroidal anti-inflammatory drug (NSAID) before a single bout of mechanical loading can reduce bone formation response. It is unknown whether this translates to an attenuation of bone strength and structural adaptations to exercise training. PURPOSE: To determine whether NSAID use before exercise prevents increases in bone structure and strength in response to weight-bearing exercise. METHODS: Adult female Wistar rats (n=43) were randomized to Ibuprofen (IBU) or Vehicle (VEH) and Exercise (EX) or Sedentary (SED) groups in a 2x2 (drug, activity) ANCOVA design with body weight as the covariate, and data are reported as mean±SE...
January 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28079705/prescribed-drinking-leads-to-better-cycling-performance-than-ad-libitum-drinking
#4
Costas N Bardis, Stavros A Kavouras, J D Adams, Nickos D Geladas, Demosthenis B Panagiotakos, Labros S Sidossis
: Drinking ad libitum during exercise often leads to dehydration ranging from -1 to -3% of body weight. PURPOSE: To study the effect of a prescribed hydration protocol matching fluid losses on a simulated 30-km criterium-like cycling performance in the heat (31.6±0.5 °C). METHOD: Ten elite, heat-acclimatized, male endurance cyclists (30±5 y, 76.5±7.2 kg, 1.81±0.07 m, VO2peak: 61.3±5.2 ml[BULLET OPERATOR]min[BULLET OPERATOR]kg, body fat: 10...
January 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28079704/modeling-perceived-exertion-during-graded-arm-cycling-exercise-in-spinal-cord-injury
#5
Jason S Au, Julia O Totosy de Zepetnek, Maureen J MacDonald
PURPOSE: Ratings of perceived exertion (RPE) may be useful for exercise testing and prescription in individuals with spinal cord injury (SCI), though the roles of differentiated central and peripheral fatigue during exercise are not clear. We aimed to model differentiated RPE responses during graded arm cycling in individuals with SCI and describe their relationship to cardiorespiratory outcomes. METHODS: Thirty-six individuals with SCI (13 paraplegia; 23 tetraplegia) completed a maximal graded-arm cycling exercise test to volitional exhaustion (5W/min paraplegia; 10W/min tetraplegia)...
January 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28072633/visual-motion-processing-subserves-faster-visuomotor-reaction-in-badminton-players
#6
Thorben Hülsdünker, Heiko K Strüder, Andreas Mierau
INTRODUCTION: Athletes participating in ball or racquet sports have to respond to visual stimuli under critical time pressure. Previous studies used visual contrast stimuli to determine visual perception and visuomotor reaction in athletes and non-athletes however, especially ball and racquet sports are characterized by motion rather than contrast visual cues. Since visual contrast and motion signals are processed in different cortical regions, this study aimed to determine differences in perception and processing of visual motion between athletes and non-athletes...
January 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28072632/asc-methylation-and-interleukin-1%C3%AE-are-associated-with-aerobic-capacity-in-heart-failure
#7
Brittany Butts, Javed Butler, Sandra B Dunbar, Elizabeth Corwin, Rebecca A Gary
BACKGROUND: Aerobic capacity, as measured by peak oxygen uptake (V[Combining Dot Above]O2), is one of the most powerful predictors of prognosis in heart failure (HF). Inflammation is a key factor contributing to alterations in aerobic capacity, and interleukin (IL)-1 cytokines are implicated in this process. The adaptor protein ASC is necessary for inflammasome activation of IL-1β and IL-18. ASC expression is controlled through epigenetic modification; lower ASC methylation is associated with worse outcomes in HF...
January 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28072631/terbutaline-accumulates-in-blood-and-urine-following-daily-therapeutic-inhalation
#8
Nanna Krogh, Sebastian Rzeppa, Anders Dyreborg, Yvette Dehnes, Peter Hemmersbach, Vibeke Backer, Morten Hostrup
PURPOSE: This study investigated pharmacokinetics of terbutaline after single and seven consecutive days of inhalation in exercising trained men. METHODS: Twelve healthy young trained men underwent two pharmacokinetic trials comparing single dose (2 mg) and seven consecutive days (2 mg×d) of inhaled terbutaline. After inhalation of terbutaline at each trial, subjects performed 90 min of bike ergometer exercise at 65% of maximal oxygen consumption after which they stayed inactive...
January 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28072630/bracing-of-the-reconstructed-and-osteoarthritic-knee-during-high-dynamic-load-tasks
#9
Harvi F Hart, Kay M Crossley, Natalie J Collins, David C Ackland
PURPOSE: Lateral compartment osteoarthritis accompanied by abnormal knee biomechanics are frequently reported in individuals with knee osteoarthritis after anterior cruciate ligament reconstruction (ACLR). The aim of this study was to evaluate changes in knee biomechanics produced by an adjusted and unadjusted varus knee brace during high dynamic loading activities in individuals with lateral knee osteoarthritis after ACLR and valgus malalignment. METHODS: Nineteen participants who had undergone ACLR 5 to 20 years previously and had symptomatic and radiographic lateral knee osteoarthritis with valgus malalignment were assessed...
January 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28060033/the-effects-of-exercise-dose-on-stereotypical-behavior-in-children-with-autism
#10
Stefanie Schmitz Olin, Bridget A McFadden, Devon L Golem, Joseph K Pellegrino, Alan J Walker, David J Sanders, Shawn M Arent
INTRODUCTION: Autism Spectrum Disorder (ASD) is a prevalent neurological disorder in children characterized by restrictive, repetitive patterns of behavior that place an added burden on everyday functions. Aerobic exercise has the propensity to reduce stereotypic behaviors in children with ASD. This study sought to quantify the acute effect of exercise and assess the influence of duration and intensity on frequency of stereotypic behaviors in children with ASD. METHODS: Participants in this study (N=7, Mage=13...
January 4, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28060036/daily-weather-and-children-s-physical-activity-patterns
#11
Teun Remmers, Carel Thijs, Anna Timperio, Jo Salmon, Jenny Veitch, Stef P J Kremers, Nicola D Ridgers
INTRODUCTION: Understanding how the weather affects physical activity (PA) may help in the design, analysis and interpretation of future studies, especially when investigating PA across diverse meteorological settings and with long follow-up periods. The present longitudinal study first aims to examine the influence of daily weather elements on intra-individual PA patterns among primary school children across four seasons, reflecting day-to-day variation within each season. Second, we investigate whether the influence of weather elements differs by day of the week (weekdays vs...
January 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28060035/etiology-and-recovery-of-neuromuscular-fatigue-following-simulated-soccer-match-play
#12
Kevin Thomas, Jack Dent, Glyn Howatson, Stuart Goodall
PURPOSE: We profiled the etiology and recovery of neuromuscular fatigue post-simulated-soccer-match-play. METHODS: Fifteen semi-professional players completed a 90 min simulated soccer match. Pre-, immediately-post and at 24, 48 and 72 h participants completed a battery of neuromuscular, physical and perceptual tests. Perceived fatigue and muscle soreness were assessed via visual analogue scales. Maximum voluntary contraction (MVC) and twitch responses to electrical (femoral nerve) and magnetic (motor cortex) stimulation during isometric knee-extensor contractions and at rest were measured to assess central (voluntary activation, VA) and peripheral (quadriceps potentiated twitch force, Qtw,pot) fatigue, and responses to single and paired-magnetic stimuli were assessed to quantify corticospinal excitability and short-intracortical inhibition (SICI), respectively...
January 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28060034/physical-activity-sedentary-time-and-fatness-in-a-biethnic-sample-of-young-children
#13
Paul J Collings, Soren Brage, Daniel D Bingham, Silvia Costa, Jane West, Rosemary Rc McEachan, John Wright, Sally E Barber
PURPOSE: To investigate associations of objectively-measured physical activity (PA) and sedentary time (ST) with adiposity in a predominantly bi-ethnic (South Asian and White British) sample of young children. METHODS: The sample included 333 children aged 11 months to 5 years who provided 526 cross-sectional observations for PA and body composition. Total PA volume (vector magnitude counts per minute (cpm)), daily time at multiple intensity levels (the cumulative time in activity >500 cpm, >1000 cpm, >1500 cpm and so on up to >6000 cpm), and time spent sedentary (<820 cpm), in light PA (820-3907 cpm) and moderate-to-vigorous PA (MVPA: ≥3908 cpm) were estimated with tri-axial accelerometry...
January 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28009791/deriving-a-gps-monitoring-time-recommendation-for-physical-activity-studies-of-adults
#14
Katelyn M Holliday, Annie Green Howard, Michael Emch, Daniel A Rodríguez, Wayne D Rosamond, Kelly R Evenson
INTRODUCTION: Determining locations of physical activity (PA) is important for surveillance and intervention development, yet recommendations for using location recording tools like Geographic Positioning System (GPS) units are lacking. Specifically, no recommendation exists for the number of days study participants should wear a GPS to reliably estimate PA time spent in locations. METHODS: This study used data from participants (N=224, age 18-85) in five states who concurrently wore an ActiGraph GT1M accelerometer and a Qstarz BT-Q1000X GPS for three consecutive weeks to construct monitoring day recommendations through variance partitioning methods...
December 22, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28009790/exercise-training-reverses-extrapulmonary-impairments-in-smoke-exposed-mice
#15
T Scott Bowen, Lars Aakerøy, Sophia Eisenkolb, Patricia Kunth, Fredrik Bakkerud, Martin Wohlwend, Anne Marie Ormbostad, Tina Fischer, Ulrik Wisloff, Gerhard Schuler, Sigurd Steinshamn, Volker Adams, Eivind Bronstad
PURPOSE: Cigarette smoking is the main risk factor for chronic obstructive pulmonary disease and emphysema. However, evidence on the extrapulmonary effects of smoke exposure that precede lung impairments remains unclear at present, as are data on non-pharmacological treatments such as exercise training. METHODS: Three groups of mice including control (n=10), smoking (n=10), and smoking with 6 weeks of high-intensity interval treadmill running (n=11) were exposed to 20 weeks of fresh air or whole-body cigarette smoke...
December 22, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28009789/heat-strain-is-exacerbated-on-the-second-of-consecutive-days-of-fire-suppression
#16
Zachary J Schlader, Deanna Colburn, David Hostler
PURPOSE: We tested the hypothesis that physiological and perceptual heat strain is exacerbated on the second of back-to-back days of fire suppression work despite evidence of full recovery. METHODS: Twenty-six career and volunteer firefighters (age: 31± 8 y) completed 20 min of near maximal fire suppression work on consecutive days. Dependent variables were core temperature, heart rate, perceived exertion and thermal sensation, which were measured before and after fire suppression...
December 22, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28009788/effect-of-load-carriage-on-upper-limb-performance
#17
Amir Hadid, Inbar Katz, Tal Haker, Gabi Zeilig, Ruth Defrin, Yoram Epstein, Amit Gefen
: Carrying heavy backpacks are often associated with shoulder discomfort or pain, loss of sensorimotor functions, and brachial plexus injuries that might hamper performance. Based on previous research, the cause of these symptoms could be tissue deformations of the brachial plexus and the subclavian artery caused by the shoulder straps. PURPOSE: To evaluate the changes in the upper extremity hemodynamic and neural function, and to assess how they are associated with brachial plexus tissue deformation during heavy load carriage...
December 22, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28009787/prevalence-of-exercise-induced-arterial-hypoxemia-in-distance-runners-at-sea-level
#18
Keren Constantini, David A Tanner, Timothy P Gavin, Craig A Harms, Joel M Stager, Robert F Chapman
PURPOSE: It has been reported that ~50% of endurance-trained men demonstrate exercise induced arterial oxyhemoglobin hypoxemia (EIAH) during heavy exercise. However, this often-cited prevalence rate comes from a single study using a cohort of 25 highly trained men who completed maximal cycle ergometry. As arterial oxyhemoglobin saturation (SpO2) during maximal exercise is reported to be significantly lower during treadmill vs. cycle ergometry in the same subjects, we hypothesized that the prevalence of EIAH would be greater than previously reported (and commonly referenced) in a larger cohort of highly endurance-trained men during maximal treadmill running...
December 22, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28009786/low-force-muscle-activity-regulates-energy-expenditure-after-spinal-cord-injury
#19
Jessica R Woelfel, Amy L Kimball, Chu-Ling Yen, Richard K Shields
: Reduced physical activity is a primary risk factor for increased morbidity and mortality, People with spinal cord injury (SCI) have reduced activity for a lifetime, as they cannot volitionally activate affected skeletal muscles. We explored whether low force and low frequency stimulation is a viable strategy to enhance systemic energy expenditure in people with SCI. PURPOSE: To determine the effects of low stimulation frequency (1 Hz, 3 Hz) and stimulation intensity (50 mA and 100 mA) on energy expenditure in people with SCI...
December 22, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28009785/active-workstations-do-not-impair-executive-function-in-young-and-middle-age-adults
#20
Peter J Ehmann, Christopher J Brush, Ryan L Olson, Shivang N Bhatt, Andrea H Banu, Brandon L Alderman
PURPOSE: To examine the effects of self-selected low-intensity walking on an active workstation on executive functions in young and middle-aged adults. METHODS: Using a within-subjects design, 32 young (20.6 ± 2.0 yr) and 26 middle-aged (45.6 ± 11.8 yr) adults performed low-intensity treadmill walking and seated control conditions in randomized order on separate days, while completing an executive function test battery. Executive functions (EFs) were assessed using modified versions of the Stroop (inhibition), Sternberg (working memory), Wisconsin Card Sorting (cognitive flexibility), and Tower of London (global EF) cognitive tasks...
December 22, 2016: Medicine and Science in Sports and Exercise
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