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International Journal of Sports Medicine

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https://www.readbyqxmd.com/read/28934805/ratings-of-perceived-exertion-and-physiological-responses-in-children-during-exercise
#1
Jennifer M Erichsen, Brandon J Dykstra, Mary C Hidde, Anthony D Mahon
OMNI ratings of perceived exertion (RPE) and physiological responses in children (n=7 boys, 8 girls, 11.1±1.0 years) were examined during estimation (graded exercise test [GXT] and steady-state) and production (steady-state) trials on a cycle ergometer. Peak oxygen consumption (VO2peak) was determined via a GXT with RPE estimated every 30 s. Later, two 6-min trials were completed: Participants 1) estimated RPE at ~75% of VO2peak, 2) produced a level of exertion corresponding to their RPE at ~75% of VO2peak during the GXT...
September 21, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28931173/hopping-and-landing-performance-in-male-youth-soccer-players-effects-of-age-and-maturation
#2
Paul James Read, Jon L Oliver, Gregory Myer, Mark De Ste Croix, Rhodri Lloyd
Quantifying hopping and landing performances can assist coaches in identifying young male soccer players who may be at increased risk of injury. The influence of chronological age and maturation on these measures in this population is unknown. Single leg hop for distance (SLHD) and 75% horizontal hop and stick landing force (75%Hop) were examined in a cross-sectional sample (N=400) of elite male youth soccer players. Between-group differences for both chronological age (U11-U18) and stage of maturation (pre-, circa- or post-peak height velocity (PHV)) were analyzed...
September 20, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28926870/cardiovascular-responses-to-resistance-exercise-performed-with-large-and-small-muscle-mass
#3
Lenifran Matos-Santos, Paulo Farinatti, Juliana P Borges, Renato Massaferri, Walace Monteiro
Prior research about the effects of the amount of exercised muscle mass upon cardiovascular responses (CVR) has neglected a potential bias related to total exercise and concentric/eccentric duration. Autonomic responses and perceived exertion (RPE) were compared in resistance exercises performed with larger and smaller muscle mass and matched for total exercise and concentric/eccentric duration. Twelve men performed 4 sets of 12 repetitions of unilateral (UNI) and bilateral (BIL) knee extensions at 70% of 12RM...
September 19, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28922683/reproducibility-reliability-and-agreement-of-post-exercise-hypotension
#4
Rafael Yokoyama Fecchio, Marcel Chehuen, Leandro Campos Brito, Tiago Peçanha, Andréia Cristiane Carrenho Queiroz, Claudia Lucia de Moraes Forjaz
This study determined the reproducibility of post-exercise hypotension (PEH) calculated by the following methods: PEH_I=post-exercise BP - pre-exercise BP; PEH_II=post-exercise BP - post-control BP; and PEH_III=[(post-exercise BP - pre-exercise BP)-(post-control BP - pre-control BP)]. Twenty-five participants underwent four sessions divided in two blocks (test and retest). Each block consisted of one exercise and one control session. BP pressure was measured before and after the interventions. The presence of systematic error (paired t-tests), reliability [intraclass coefficient correlation (ICC)], and agreement [typical error (TE) and minimal detectable difference (MDD)] were evaluated...
September 18, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28922682/the-energy-cost-of-running-with-the-ball-in-soccer
#5
Alessandro Piras, Milena Raffi, Charalampos Atmatzidis, Franco Merni, Rocco Di Michele
Running with the ball is a soccer-specific activity frequently used by players during match play and training drills. Nevertheless, the energy cost (EC) of on-grass running with the ball has not yet been determined. The purpose of this study was therefore to assess the EC of constant-speed running with the ball, and to compare it with the EC of normal running. Eight amateur soccer players performed two 6- min runs at 10 km/h on artificial turf, respectively with and without the ball. EC was measured with indirect calorimetry and, furthermore, estimated with a method based on players' accelerations measured with a GPS receiver...
September 18, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28922681/exercise-training-protects-cardiomyocytes-from-deleterious-effects-of-palmitate
#6
Marcia Netto Magalhães Alves, Danilo Roman-Campos, Amanda B Parreira, Pedro W M Almeida, Jader Santos Cruz, Silvia Guatimosim, Marco Fabricio Dias-Peixoto
We investigated the effects of palmitate, a high saturated fat, on Ca(2+), action potential and reactive oxygen species dynamics in cardiomyocytes from untrained and trained mice. Male mice were subjected to moderate intensity exercise training on a treadmill. Cardiomyocytes of untrained and trained mice were isolated, treated for 30 min with palmitate and intracellular calcium transient and action potential duration were recorded. Additionally, we assessed reactive oxygen species generation. Treatment of cardiomyocytes from untrained mice with palmitate induced a significant decrease in Ca(2+) transient magnitude by 34%...
September 18, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28895624/development-of-an-incremental-sit-to-stand-exercise-for-aerobic-fitness-evaluation
#7
Keisuke Nakamura, Yuya Nagasawa, Shoji Sawaki, Yoshiharu Yokokawa, Masayoshi Ohira
Incremental sit-to-stand exercise (ISTS) is an incremental exercise test using external signals to control the sit-to-stand rate in a given time frame. This study aimed to investigate the concurrent validity and reproducibility of the ISTS in aerobic fitness evaluation among healthy elderly women. Sixteen elderly women performed the ISTS and cycle ergometer test at 3-day to 2-week intervals, and six of the participants performed the ISTS twice. Peak oxygen uptake (VO2), peak heart rate and completion time on the ISTS and cycle ergometer test were determined...
September 11, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28895623/comprehensive-analytics-of-actovegin%C3%A2-and-its-effect-on-muscle-cells
#8
Franz-Xaver Reichl, Lesca Miriam Holdt, Daniel Teupser, Gregor Schütze, Alan J Metcalfe, Reinhard Hickel, Christof Högg, Wilhelm Bloch
The ingredients of Actovegin(®) were analyzed and its effects on the muscle cell proliferation were investigated. C2C12 myoblasts were cultured in medium. Actovegin(®) was added in five different concentrations (1, 5, 25, 125, and 250 µg) to the differentiation medium. The formations of proliferation factor Ki67 and myosin heavy chains were measured by immunofluorescence. The first primary antibody was anti-Ki67 and anti-Mf20. Cells were washed and treated with the second fluorochrome. Thirty-one Actovegin(®) ingredients were found to contain significantly higher concentrations and twenty-nine ingredients were found to contain significantly lower concentrations, compared to the mean ranges as described in the literature for the normal physiological concentrations in human adult serum/plasma...
September 11, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28895622/sciatic-nerve-conductivity-is-impaired-by-hamstring-strain-injuries
#9
Karina Kouzaki, Koichi Nakazato, Masuhiko Mizuno, Tooru Yonechi, Yusuke Higo, Yoshiaki Kubo, Tokuyoshi Kono, Kenji Hiranuma
The aim of this study was to assess sciatic nerve conductivity in athletes with a history of hamstring strain injuries. Twenty-seven athletes with a history of hamstring strain injuries were included in the injured group. The control group consisted of 16 uninjured participants. We measured the proximal and distal latencies and calculated the sciatic nerve conduction velocity to evaluate neuronal conductivity. The results were expressed as median values and interquartile ranges. Both proximal latency and distal latency of the injured limb in the injured group were significantly longer than those of the uninjured limb (p<0...
September 11, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28895621/optimum-drop-jump-height-in-division-iii-athletes-under-75-of-vertical-jump-height
#10
Hsien-Te Peng, Cong Toai Khuat, Thomas W Kernozek, Brian J Wallace, Shin-Liang Lo, Chen-Yi Song
Our purpose was to evaluate the vertical ground reaction force, impulse, moments and powers of hip, knee and ankle joints, contact time, and jump height when performing a drop jump from different drop heights based on the percentage of a performer's maximum vertical jump height (MVJH). Fifteen male Division III athletes participated voluntarily. Eleven synchronized cameras and two force platforms were used to collect data. One-way repeated-measures analysis of variance tests were used to examine the differences between drop heights...
September 11, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28895620/epidemiology-of-overuse-injuries-in-youth-team-sports-a-3-year-prospective-study
#11
Mari Leppänen, Kati Pasanen, Pekka Kannus, Tommi Vasankari, Urho M Kujala, Ari Heinonen, Jari Parkkari
Prospective studies on overuse injuries and their impact on athletic training among youth team sports are scarce. The purpose of this study was to investigate the incidence, severity and player related risk factors of overuse injuries among young (12-20 years) basketball and floorball players. A total of 387 players participated in a 3-year prospective study. Each player completed a baseline questionnaire regarding their background information. Overuse injuries that prevented players to fully or partly participate in their regular training were collected...
September 11, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28895619/symptoms-of-common-mental-disorders-in-professional-rugby-an-international-observational-descriptive-study
#12
Vincent Gouttebarge, Phil Hopley, Gino Kerkhoffs, Evert Verhagen, Wayne Viljoen, Paul Wylleman, Mike I Lambert
The aim of the study was to determine the prevalence of symptoms of common mental disorders among professional rugby players across countries. A cross-sectional analysis of the baseline questionnaires from an ongoing prospective cohort study was conducted. Nine national players' associations and three rugby unions distributed questionnaires based on validated scales for assessing symptoms of common mental disorders. Among the whole study sample (N=990; overall response rate of 28%), prevalence (4-week) of symptoms of common mental disorders ranged from 15% for adverse alcohol use to 30% for anxiety/depression...
September 11, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28799161/performance-factors-in-a-mountain-ultramarathon
#13
Pascal Balducci, Michel Clémençon, Robin Trama, Yoann Blache, Christophe Hautier
This study aimed to determine mountain ultra-marathon (MUM) performance factors in a large group of endurance mountain runners. Maximal aerobic speed (MAS) was assessed one week prior to the MUM. The level and graded (10%) energy cost of running, stiffness, knee extensors force (KEf), and jump height on a counter movement jump (CMJ) were measured in 24 male ultra runners before (pre) and immediately after (post) the Interlacs Trail (75 km and 3 930/3 700 m d+/d-). Performance time was correlated with MAS (r=- 0...
August 10, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28799160/intramuscular-perfusion-response-in-delayed-onset-muscle-soreness-doms-a-quantitative-analysis-with-contrast-enhanced-ultrasound-ceus
#14
Marion Kellermann, Rafael Heiss, Bernd Swoboda, Kolja Gelse, Jürgen Freiwald, Casper Grim, Armin Nagel, Michael Uder, Dane Wildner, Thilo Hotfiel
The purpose of this study was to analyse intramuscular perfusion response in ultrastructural muscle lesions, by applying contrast-enhanced ultrasound (CEUS) to a delayed onset muscle soreness (DOMS) model. Results of this analysis were compared to high-resolution 3 Tesla MRI T2-weighted sequences. 14 healthy participants were recruited. Average perfusion parameters, represented as Peak enhancement (contrast agent inflow) and wash-in area under curve (WiAUC) of the gastrocnemius (GM) and soleus muscle (SM) were assessed before (baseline) and 60 h after inducing DOMS by eccentric exercise...
August 10, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28783845/serotonin-shapes-the-migratory-potential-of-nk-cells-an-in-vitro-approach
#15
Philipp Zimmer, Wilhelm Bloch, Markus Kieven, Lukas Lövenich, Jonas Lehmann, Michelle Holthaus, Sebastian Theurich, Alexander Schenk
Increased serotonin (5-HT) levels have been shown to influence natural killer cell (NK cell) function. Acute exercise mobilizes and activates NK cells and further increases serum 5-HT concentrations in a dose-dependent manner. The aim of this study was to investigate the impact of different serum 5-HT concentrations on NK cell migratory potential and cytotoxicity.The human NK cell line KHYG-1 was assigned to 4 conditions, including 3 physiological concentrations of 5-HT (100, 130 or 170 µg/l 5-HT) and one control condition...
August 7, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28783849/multiple-measures-are-needed-to-quantify-training-loads-in-professional-rugby-league
#16
Daniel Weaving, Ben Jones, Phil Marshall, Kevin Till, Grant Abt
This study aims to investigate the effect of training mode (conditioning and skills) on multivariate training load relationships in professional rugby league via principal component analysis. Four measures of training load (internal: heart rate exertion index, session rating of perceived exertion; external: PlayerLoad™, individualised high-speed distance) were collected from 23 professional male rugby league players over the course of one 12 wk preseason period. Training was categorised by mode (skills or conditioning) and then subjected to a principal component analysis...
September 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28783848/effects-of-fatigue-on-voluntary-electromechanical-and-relaxation-electromechanical-delay
#17
Cory M Smith, Terry J Housh, Ethan C Hill, Joshua L Keller, Glen O Johnson, Richard J Schmidt
The purposes of the present study were to examine: 1) the effects of fatigue on electromechanical delay from the onsets of the electromyographic signal to force production (EMDE-F), the onsets of the electromyographic to mechanomyographic signals (EMDE-M), the onsets of the mechanomyographic signal to force production (EMDM-F), as well as the cessations of the electromyographic to force production (R-EMDE-F), cessation of the electromyographic to mechanomyographic signals (R-EMDE-M), and cessations of the mechanomyographic signal to force production (R-EMDM-F); and 2) the relative contributions from EMDE-M and EMDM-F to EMDE-F as well as R-EMDE-M and R-EMDM-F to R-EMDE-F from the vastus lateralis in non-fatigued and fatigued states...
September 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28783847/movement-patterns-of-a-u-20-national-women-s-soccer-team-during-competitive-matches-influence-of-playing-position-and-performance-in-the-first-half
#18
Guilherme Passos Ramos, Fábio Yuzo Nakamura, Lucas Adriano Pereira, Wanderley Brilhante Junior, Fábio Mahseredjian, Carolina Franco Wilke, Emerson Silami Garcia, Cândido Celso Coimbra
The aim of this study was to determine the match locomotor characteristics of a sample of U-20 Brazilian female soccer players. Seven international matches were analyzed during the 2015 U-20 South American Championship, using global positioning technology. During a typical match, fullbacks and forwards covered greater distances in high-intensity running and sprinting than central defenders and midfielders (effect size [ES]=1.42-3.69). In the final 15 min of a game, total and high-intensity running distance and player load were ≈20 to 35% (ES=0...
September 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28783846/cardiorespiratory-responses-to-continuous-and-intermittent-exercises-in-children
#19
Georges Baquet, François-Xavier Gamelin, Julien Aucouturier, Serge Berthoin
The aim of the study was to characterize aerobic responses to high intensity intermittent (HIIE) and continuous (CE) exercises in prepubertal children. 26 children aged 8 to 11-year-old took part in a preliminary session to determine peakVO2 and Maximal Aerobic Velocity (MAV). In 5 subsequent experimental visits, the participants completed 2 CE and 3 HIIE sessions in a randomized order. HIIE consisted of short intermittent 10-s and 20-s running bouts at 100 to 130% MAV, interspersed with recovery periods of equal duration (S-HIIE1 and S-HIIE2 respectively) and 5-s of sprinting and jumping at maximal intensity with 15-s recovery periods (S-HIIE3)...
September 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28772336/the-effect-of-clinical-pilates-on-functional-movement-in-recreational-runners
#20
Anna Laws, Sean Williams, Cassie Wilson
Biomechanical imbalances and inefficient functional movements are considered contributing factors to running-related injuries. Clinical Pilates uses a series of exercises focused on retraining normal movement patterns. This study investigated whether a 6-week course of Clinical Pilates improves functional movement and thereby, potentially, reduces the risk of running-related injuries associated with movement dysfunction. A modified functional movement screen was used to analyze the functional movement ability of forty runners...
September 2017: International Journal of Sports Medicine
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