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Scandinavian Journal of Medicine & Science in Sports

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https://www.readbyqxmd.com/read/28730749/impact-of-the-dynamic-and-static-component-of-the-sport-practiced-for-electrocardiogram-analysis-in-screening-athletes
#1
Nicolas Maillot, Charles Guenancia, Nobila V Yameogo, Aurélie Gudjoncik, Fabien Garnier, Luc Lorgis, Frédéric Chagué, Yves Cottin
BACKGROUND: To interpret the electrocardiogram (ECG) of athletes, the recommendations of the ESC and the Seattle criteria define type-1 peculiarities, those induced by training, and type-2, those not induced by training, to rule out cardiomyopathy. The specificity of the screening was improved by Sheikh who definied "Refined Criteria", which includes a group of intermediate peculiarities. The aim of our study was to investigate the influence of static and dynamic components on the prevalence of different types of abnormalities...
July 21, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28730741/the-power-of-competence-support-the-impact-of-coaches-and-athlete-leaders-on-intrinsic-motivation-and-performance
#2
Katrien Fransen, Filip Boen, Maarten Vansteenkiste, Niels Mertens, Gert Vande Broek
Grounded in the Cognitive Evaluation Theory, a mini-theory of Self-Determination Theory, this experimental field study sought to examine the impact of competence support of both coaches and athlete leaders on athletes' competence satisfaction, intrinsic motivation, and subjective as well as objective performance. Male basketball players (N = 120) were allocated to groups of five players. These groups were then randomly assigned to a control group or to one of three experimental conditions. In these experimental conditions either the coach, the athlete leader, or both provided motivational feedback to their team...
July 21, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28685862/sprint-mechanics-evaluation-using-inertial-sensor-based-technology-a-laboratory-validation-study
#3
Igor Setuain, Pablo Lecumberri, Juha P Ahtiainen, Antti A Mero, Keijo Häkkinen, Mikel Izquierdo
Advances in micro-electromechanical systems have turned magnetic inertial measurement units (MIMUs) into a suitable tool for vertical jumping biomechanical evaluation. Thus, the presented study aimed to determine if appropriate reliability and agreement reports could also be obtained when analysing 20m sprint mechanics. Four bouts of 20 m sprints were evaluated to determine if the data provided by a MIMU placed at the lumbar spine could reliably assess sprint mechanics and to examine the validity of the MIMU sensor compared to force plate recordings...
July 7, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28685860/exercise-mediated-modulation-of-autophagy-in-skeletal-muscle
#4
REVIEW
Marcos Martin-Rincon, David Morales-Alamo, Jose A L Calbet
Although exercise exerts multiple beneficial health effects, it may also damage cellular structures. Damaged elements are continuously degraded and its constituents recycled to produce renovated structures through a process called autophagy, which is essential for the adaptation to training. Autophagy is particularly active in skeletal muscle, where it can be evaluated by using specific molecular markers of activation (unc-51-like kinase 1 (ULK1) phosphorylation) and specific proteins indicating increased autophagosome content (increased total LC3, LC3-II, LC3-II/LC3-I ratio)...
July 7, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28675778/hip-abductor-muscle-activity-during-walking-in-individuals-with-gluteal-tendinopathy
#5
Kim Allison, Sauro E Salomoni, Kim L Bennell, Tim V Wrigley, Francois Hug, Bill Vicenzino, Alison Grimaldi, Paul W Hodges
The external hip adduction moment during walking is greater in individuals with gluteal tendinopathy (GT) than pain-free controls. Although this likely represents a greater demand on the hip abductor muscles implicated in GT, no study has investigated activation of these muscles in GT. For this purpose, fine wire electrodes were inserted into the segments of the gluteus minimus and medius muscles, and surface electrodes placed on the tensor fascia lata, upper gluteus maximus and vastus lateralis muscles of thirteen individuals with, and thirteen without, GT...
July 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28675771/kinematic-chain-related-risk-factors-in-the-development-of-lower-extremity-injuries-in-women-a-prospective-study
#6
Ruth Verrelst, Damien Van Tiggelen, Roel De Ridder, Erik Witvrouw
The link between dynamic range of motion (dROM) parameters within the kinematic chain and the development of lower extremity (LE) injury have gained attention, however very few longitudinal studies have been conducted. Therefore, we wanted to prospectively determine dROM related risk factors for the development of LE injury. Within this study, 90 female physical education students aged 19.33±0.87 years were tested. Full-body kinematic and vertical ground reaction force (VGRF) parameters were measured during a triple hop jump (THJ)...
July 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28675760/association-of-perceived-physical-health-and-physical-fitness-in-two-swedish-national-samples-from-1990-and-2015
#7
S J G Olsson, E Ekblom-Bak, B Ekblom, L V Kallings, Ö Ekblom, M Börjesson
BACKGROUND: Perceived health and physical fitness have been shown to correlate, and low levels of either variable increase the risk for future illness and mortality. However, risk factors and their interrelationship may vary between societies and over time. In this study, the associations of physical fitness and perceived health were therefore assessed in two Swedish national samples 25 years apart. METHODS: Perceived physical health, dichotomized as "good" or "bad", maximal oxygen uptake (VO2 max), counter movement jump (CMJ), balance (one-legged 60 second stance), and self-reported demographics and lifestyle were recorded in two cross-sectional samples (sample size, number of eligible participants) of Swedish adults, aged 20 - 65 years, in 1990 - 1991 (2203, 1365), and 2013 - 2015 (3357, 422)...
July 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28665523/emotional-labor-and-professional-practice-in-sports-medicine-and-science
#8
Rebecca F Hings, Christopher R D Wagstaff, Richard C Thelwell, Sarah Gilmore, Valerie Anderson
The aim of the present study was to explore how sport medicine and science practitioners manage their emotions through emotional labor when engaging in professional practice in elite sport. To address the research aim a semi-structured interview design was adopted. Specifically, eighteen professional sport medicine and science staff provided interviews. The sample comprised sport and exercise psychologists (n = 6), strength and conditioning coaches (n = 5), physiotherapists (n = 5), one sports doctor and one generic sport scientist...
June 30, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28658509/relationship-between-achilles-tendon-length-and-running-performance-in-well-trained-male-endurance-runners
#9
Hiromasa Ueno, Tadashi Suga, Kenji Takao, Takahiro Tanaka, Jun Misaki, Yuto Miyake, Akinori Nagano, Tadao Isaka
The present study aimed to determine the relationship between Achilles tendon (AT) length and running performance, including running economy, in well-trained endurance runners. We also examined the reasonable portion of the AT related to running performance among AT lengths measured in three different portions. The AT lengths at three portions and cross-sectional area (CSA) of 30 endurance runners were measured using magnetic resonance imaging. Each AT length was calculated as the distance from the calcaneal tuberosity to the muscle-tendon junction of the soleus, gastrocnemius medialis (GMAT ), and gastrocnemius lateralis, respectively...
June 28, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28649805/cross-country-skiing-movement-factorization-to-explore-relationships-between-skiing-economy-and-athletes-skills
#10
Barbara Pellegrini, Chiara Zoppirolli, Gennaro Boccia, Lorenzo Bortolan, Federico Schena
We investigated the relationships between the biomechanics of the double poling (DP) technique in cross-country skiing, its economy and athletes' skill. To this aim, skiers' motion has been factorized into components through principal component analysis (PCA).Eight high-level (HL) and eight regional level (RL) male cross-country skiers performed a 5-min submaximal DP trial while roller skiing on a treadmill at 14 km h(-1) and 2° incline. Whole-body kinematics was recorded with a motion capture system. PCA was applied to markers coordinates to extract principal movements (PMk ), which were ranked by their variance...
June 26, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28649793/characteristics-of-acute-groin-injuries-in-the-hip-flexor-muscles-a-detailed-mri-study-in-athletes
#11
Andreas Serner, Adam Weir, Johannes L Tol, Kristian Thorborg, Frank Roemer, Ali Guermazi, Eduardo Yamashiro, Per Hölmich
Hip flexor injuries account for one third of acute groin injuries; however, little is known about specific injury characteristics. The aims of this study was to describe acute hip flexor injuries using magnetic resonance imaging (MRI) in athletes with acute groin pain, and to compare specific muscle injuries with reported injury situations. Male athletes with acute groin pain were prospectively and consecutively included during 3 sports seasons. MRI was performed within 7 days of injury using a standardized protocol and a reliable assessment approach...
June 26, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28649743/l-arginine-modulates-inflammation-and-muscle-regulatory-genes-after-a-single-session-of-resistance-exercise-in-rats
#12
Samuel R L Morais, Victor Gustavo B Brito, Wagner G Mello, Sandra H P Oliveira
We investigated the skeletal muscle adaptation to L-arginine supplementation prior to a single session of resistance exercise (RE) during the early phase of muscle repair. Wistar rats were randomly assigned into non-exercised (Control), RE plus vehicle (RE); RE plus L-arginine (RE+L-arg) and RE plus aminoguanidine (RE+AG) groups. Animals received four doses of either vehicle (0.9%NaCl), L-arg (1g/b.w.), or AG (iNOS inhibitor) (50mg/b.w.). The animals performed a single RE session until the concentric failure (ladder climbing; 80% overload) and the skeletal muscles were harvested at 0, 8, 24 and 48h post RE...
June 26, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28649720/in-season-changes-in-heart-rate-recovery-are-inversely-related-to-time-to-exhaustion-but-not-aerobic-capacity-in-rowers
#13
Kristin Haraldsdottir, Stacey Brickson, Jennifer Sanfilippo, Warren Dunn, Andrew Watson
PURPOSE: Determine if in-season changes in heart rate recovery (HRR) are related to aerobic fitness and performance in collegiate rowers. METHODS: 22 female collegiate rowers completed testing before and after their competitive season. Body fat percentage (BF%) was determined by dual-energy x-ray absorptiometry. Maximal aerobic capacity (VO2max ) and time to exhaustion (Tmax ) were determined during maximal rowing ergometer testing followed by 1 minute of recovery...
June 26, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28649714/exercise-during-short-term-exposure-to-hypoxia-or-hyperoxia-novel-treatment-strategies-for-type-2-diabetic-patients
#14
REVIEW
C Brinkmann, W Bloch, K Brixius
Both hypoxia (decreased oxygen availability) and hyperoxia (increased oxygen availability) have been shown to alter exercise adaptations in healthy subjects. This review aims to clarify the possible benefits of exercise during short-term exposure to hypoxia or hyperoxia for patients with type 2 diabetes mellitus (T2DM). There is evidence that exercise during short-term exposure to hypoxia can acutely increase skeletal muscle glucose uptake more than exercise in normoxia, and that post-exercise insulin sensitivity in T2DM patients is more increased when exercise is performed under hypoxic conditions...
June 26, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28649700/characteristics-of-acute-groin-injuries-in-the-adductor-muscles-a-detailed-mri-study-in-athletes
#15
Andreas Serner, Adam Weir, Johannes L Tol, Kristian Thorborg, Frank Roemer, Ali Guermazi, Eduardo Yamashiro, Per Hölmich
Acute adductor injuries account for the majority of acute groin injuries; however, little is known about specific injury characteristics, which could be important for the understanding of etiology and management of these injuries. The study aim was to describe acute adductor injuries in athletes using magnetic resonance imaging (MRI). Male athletes with acute groin pain and an MRI confirmed acute adductor muscle injury were prospectively included. MRI was performed within 7 days using a standardized protocol and a reliable assessment approach...
June 26, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28628245/effects-of-resistance-training-using-known-vs-unknown-loads-on-eccentric-phase-adaptations-and-concentric-velocity
#16
J L Hernández-Davó, R Sabido, D G Behm, A J Blazevich
The aims of this study were to compare both eccentric- and concentric-phase adaptations in highly trained handball players to 4 weeks of twice-weekly rebound bench press throw training with varying loads (30%, 50% and 70% of one-repetition maximum [1-RM]) using either known (KL) or unknown (UL) loads and to examine the relationship between changes in eccentric- and concentric-phase performance. Twenty-eight junior team handball players were divided into two experimental groups (KL or UL) and a control group...
June 19, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28621884/young-athletes-with-ventricular-premature-beats-continuing-or-not-intense-training-and-competition
#17
Attilio Parisi, Eliana Tranchita, Carlo Minganti, Fabio Sperandii, Emanuele Guerra, Leonardo Calò, Paolo Borrione, Fabio Pigozzi
INTRODUCTION: Isolated ventricular premature beats (VPBs) are commonly found during pre-participation screening in athletes. Currently the debate about the role of detraining in reducing the number of VPBs is still open. This study evaluated the arrhythmic risk in a population of young competitive athletes who showed VPBs during eligibility evaluation and that did not undergo detraining but continued practicing competitive sports. METHODS: 3746 consecutive subjects underwent pre-participation screening...
June 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28605148/effects-of-a-dynamic-core-stability-program-on-the-biomechanics-of-cutting-maneuvers-a-randomized-controlled-trial
#18
E F Whyte, C Richter, S O'Connor, K A Moran
Deficits in trunk control predict ACL injuries which frequently occur during high-risk activities such as cutting. However, no existing trunk control/core stability program has been found to positively affect trunk kinematics during cutting activities. This study investigated the effectiveness of a 6-week dynamic core stability program (DCS) on the biomechanics of anticipated and unanticipated side and crossover cutting maneuvers. Thirty-one male, varsity footballers participated in this randomized controlled trial...
June 12, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28605065/injuries-in-youth-track-and-field-are-perceived-to-have-multiple-level-causes-that-call-for-ecological-holistic-developmental-interventions-a-national-sporting-community-perceptions-and-experiences
#19
Jenny Jacobsson, Daniel Bergin, Toomas Timpka, James M Nyce, Örjan Dahlström
Engaging in competitive sports as a youth can have many health benefits, but recent studies also report a high risk for injury. The long-term purpose of this Swedish research program is to develop a framework for safe track and field training for young athletes (aged 12-15 years). The aim of this study was to establish what is perceived to contribute and cause injuries in youth track and field by compiling the best available experiential knowledge about the underlying factors and use this knowledge to identify appropriate areas to handle these in practical ways...
June 12, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28603874/impact-of-rest-duration-on-achilles-tendon-structure-and-function-following-isometric-training
#20
C M Waugh, T Alktebi, A de Sa, A Scott
Intervention programs are often sought to strengthen the Achilles tendon (AT) due to its high injury rate. Long rest periods between loading cycles have been found to increase collagen synthesis by tenocytes, suggesting rest duration may be important for tendon adaptation in vivo, however exercise programs comparing long and short rest duration have not been directly compared. Fourteen adults completed a 12-week progressive training intervention; training sessions consisted of 5 x 10 isometric plantarflexion contractions each of 3-s duration performed at 90% of MVC three times weekly...
June 12, 2017: Scandinavian Journal of Medicine & Science in Sports
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