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Scandinavian Journal of Medicine & Science in Sports

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https://www.readbyqxmd.com/read/29222948/force-coordination-strategies-in-on-water-single-sculling-are-asymmetries-related-to-better-rowing-performance
#1
John Warmenhoven, Richard Smith, Conny Draper, Andrew Harrison, Norma Bargary, Stephen Cobley
Asymmetries of the rowing stroke cycle have been assessed with reference to kinematics and foot-force measures in laboratory testing environments. It remains unclear how asymmetries in propulsive kinetic measures are related to on-water rowing performance. A new approach for the evaluation of both global and local asymmetries across the entire movement was used to assess the continuous role of asymmetries and whether these change according to level of competitive representation. Twenty seven highly skilled female rowers (national and international competition level), rowing at 32 strokes per minute in a single scull boat were evaluated...
December 9, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29205517/within-day-energy-deficiency-and-reproductive-function-in-female-endurance-athletes
#2
I L Fahrenholtz, A Sjödin, D Benardot, Å B Tornberg, S Skouby, J Faber, J Sundgot-Borgen, A Melin
We aimed to estimate and compare within-day energy balance (WDEB) in athletes with eumenorrhea and menstrual dysfunction (MD) with similar 24-hour energy availability/energy balance (EA/EB). Furthermore, to investigate whether within-day energy deficiency is associated with resting metabolic rate (RMR), body-composition, S-cortisol, estradiol, T3 , and fasting blood glucose. We reanalyzed 7-day dietary intake and energy expenditure data in 25 elite endurance athletes with eumenorrhea (n=10) and MD (n=15) from a group of 45 subjects where those with disordered eating behaviors (n=11), MD not related to low EA (n=5), and low dietary record validity (n=4) had been excluded...
December 5, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29205515/yoga-training-modulates-adipokines-in-adults-with-high-normal-blood-pressure-and-metabolic-syndrome
#3
Rashmi Supriya, Angus P Yu, Paul H Lee, Christopher W Lai, Kenneth K Cheng, Sonata Y Yau, Lawrence W Chan, Benjamin Y Yung, Parco M Siu
OBJECTIVES: Metabolic syndrome (MetS) is associated with diabetes mellitus and cardiovascular diseases. Our previous study indicated that people with MetS showed a decrease in waist circumference and a decreasing trend in blood pressure after 1 year of yoga. This study investigated the effect of yoga on MetS people with high-normal blood pressure by exploring modulations in pro-inflammatory adipokines (leptin, chemerin, visfatin and plasminogen activator inhibitor-1 or PAI-1) and an anti-inflammatory adipokine (adiponectin)...
December 5, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29197119/fundamental-movement-skills-in-adolescents-secular-trends-from-2003-to-2010-and-associations-with-physical-activity-and-bmi
#4
Pertti Huotari, Pilvikki Heikinaro-Johansson, Anthony Watt, Timo Jaakkola
The aim of this study was to examine the secular trends in fundamental movement skills (FMS) among 15-16-year-old adolescents at two assessment points scheduled in 2003 and 2010, and to investigate the associations between FMS, physical activity (PA) and body mass index (BMI). In 2003, self-reported PA, weight and height, and objective FMS scores were collected from 2390 students and in 2010, similar data was generated from a second sample of 1346 students. FMS were assessed during both assessment phases using three identical objective FMS tests that were figure 8 dribbling, jumping laterally, and coordination track tests...
December 2, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29193314/effects-of-wobble-board-training-on-single-leg-landing-neuromechanics
#5
Priscila de Brito Silva, Anderson Souza Castelo Oliveira, Natalie Mrachacz-Kersting, Uwe Gustav Kersting
Balance training programs have been shown to reduce ankle sprain injuries in sports, but little is known about the transfer from this training modality to motor coordination and ankle joint biomechanics in sport specific movements. This study aimed to investigate the effects of wobble board training on motor coordination and ankle mechanics during early single-leg landing from a lateral jump. Twenty-two healthy men were randomly assigned to either a control or a training group, who engaged in four weeks of wobble board training...
November 29, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29193343/response-to-considerations-on-achilles-and-patellar-tendinopathy-display-opposite-changes-in-elastic-properties
#6
Brooke Kaye Coombes, Kylie Tucker, Bill Vicenzino, Viana Vuvan, Rebecca Mellor, Luke Heales, Antoine Nordez, François Hug
We thank Wu (2017) and the editors for the opportunity to provide greater discussion on the association of tendon shear wave velocity (SWV) with potentially important covariates including sex and age. We would like to first clarify that we did not directly compare the Achilles and patellar tendinopathy groups. Instead, the (most) affected tendon from each tendinopathy group was compared with a matched tendon from the healthy control group. This article is protected by copyright. All rights reserved.
November 28, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29193329/a-few-considerations-on-achilles-and-patellar-tendinopathy-display-opposite-changes-in-elastic-properties
#7
Chueh-Hung Wu
I read with great interest the article by Coombes and colleagues1 , who utilized shear wave ultrasound elastography to measure shear wave velocity (SWV) of the patellar and Achilles tendons in those with patellar and Achilles tendinopathy. This article is protected by copyright. All rights reserved.
November 28, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29164685/vastus-intermedius-versus-vastus-lateralis-fascicle-behaviors-during-maximal-concentric-and-eccentric-contractions
#8
Ryosuke Ando, Kazunori Nosaka, Aya Tomita, Kohei Watanabe, Anthony J Blazevich, Hiroshi Akima
Vastus intermedius (VI) plays a major role in knee extension, but its fascicle behaviors during dynamic contractions are not well understood. The present study aimed to compare VI and vastus lateralis (VL) fascicle behaviors during singular maximal concentric and eccentric contractions. Thirteen men (27.1 ± 3.4 y) performed maximal isokinetic concentric contractions through knee joint angles of 105° to 35° (0° = full extension) and eccentric contractions from 35° to 105° at an angular velocity of 30°/s...
November 22, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29161769/influence-of-biceps-brachii-tendon-mechanical-properties-on-elbow-flexor-force-steadiness-in-young-and-old-males
#9
Rowan R Smart, Stéphane Baudry, Andrey Fedorov, Samantha L Kuzyk, Jennifer M Jakobi
Elbow flexor force steadiness (FS) depends on strength and decreases with age. Achilles tendon mechanics effect standing balance and isometric plantarflexion FS. This study investigated the influence of distal biceps brachii (BB) tendon mechanics and elbow flexor strength on age-related decline in FS. Nine young (23±2 years) and 9 old (77±5 years) males performed submaximal isometric elbow flexion tasks at low (2.5, 5, 10% maximal voluntary contraction (MVC)) and high (20, 40, 60, 80%MVC) forces in a neutral forearm position...
November 21, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29161767/effects-of-different-endurance-exercise-modalities-on-migraine-days-and-cerebrovascular-health-in-episodic-migraineurs-a-randomized-controlled-trial
#10
Henner Hanssen, Alice Minghetti, Stefano Magon, Anja Rossmeissl, Maria Rasenack, Athina Papadopoulou, Christopher Klenk, Oliver Faude, Lukas Zahner, Till Sprenger, Lars Donath
BACKGROUND: Aerobic exercise training is a promising complementary treatment option in migraine and can reduce migraine days and improve retinal microvascular function. Our aim was to elucidate whether different aerobic exercise programs at high vs. moderate intensities distinctly affect migraine days as primary outcome and retinal vessel parameters as a secondary. METHODS: In this randomized controlled trial, migraine days were recorded by a validated migraine diary in 45 migraineurs of which 36 (female: 28; age: 36 (SD:10)/ BMI: 23...
November 21, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29161759/asymmetry-during-functional-movement-screening-and-injury-risk-in-junior-football-players-a-replication-study
#11
Samuel Chalmers, Thomas A Debenedictis, Andrew Zacharia, Samuel Townsley, Cara Gleeson, Matthew Lynagh, Alex Townsley, Joel T Fuller
An indicator of movement quality and potential injury risk during Functional Movement Screen (FMS) testing is the presence of asymmetry when comparing the left and right sides of the body. The aim of the study was to investigate the reproducibility of the injury risk model proposed in our previous research (Chalmers et al. 2017; derivation study) that showed an increased injury risk for elite junior Australian football players demonstrating ≥2 asymmetrical FMS sub-tests. We used a direct replication design...
November 21, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29161758/young-athletes-health-knowledge-system-qualitative-analysis-of-health-learning-processes-in-adolescent-sportspersons
#12
Laura I Rodríguez-Serrano, Toomas Timpka, Joakim Ekberg, Örjan Dahlström, Jenny Jacobsson
Recognized side effects on health associated with sports participation in youth include overtraining, doping, and exposure to harassment and violence. Many of these effects originate in contexts where young athletes are beginning to make decisions about their sports practices on their own. This study set out to explore knowledge and reasoning about health among adolescent athletes and to describe how health knowledge management structures are associated with different social systems. Qualitative data were collected from focus groups involving 65 young Swedish athletes aged 16 to 17 years...
November 21, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29154407/exercise-dynamic-stability-under-unstable-conditions-increases-muscle-strength-and-balance-ability-in-the-elderly
#13
Azza Hamed, Sebastian Bohm, Falk Mersmann, Adamantios Arampatzis
The purpose of the current study was to assess the effectiveness of a specific exercise intervention of mechanisms to control dynamic postural stability under unstable conditions in old adults. Forty-seven old adults (65-80 years) were assigned to two experimental groups (muscle strength group, n=15, perturbation-based group, n=16) and a control group (n=16). The strength group performed resistance exercises for legs and trunk muscles, while the perturbation-based group exercised mechanisms of dynamic stability under unstable conditions...
November 20, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29144568/kinematic-analysis-of-pressing-situations-in-female-collegiate-football-games-new-insight-into-acl-injury-causation
#14
Shogo Sasaki, Hideyuki Koga, Tron Krosshaug, Satoshi Kaneko, Toru Fukubayashi
The most common events during which anterior cruciate ligament (ACL) injuries occur in football are pressing situations. This study aimed to describe the knee and hip joint kinematics during pressing situations in football games in order to identify kinematic patterns in actions with a high risk for ACL injuries. We filmed 5 female collegiate football matches and identified 66 pressing situations. Five situations with a large distance between the trunk and foot placements in the sagittal plane were analysed using a model-based image-matching technique...
November 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29144567/reliable-recognition-of-lying-sitting-and-standing-with-a-hip-worn-accelerometer
#15
Henri Vähä-Ypyä, Pauliina Husu, Jaana Suni, Tommi Vasankari, Harri Sievänen
Hip-worn accelerometers are widely used to estimate physical activity (PA), but the accuracy of acceleration-threshold based analysis is compromised when it comes to identifying stationary and sedentary behaviors, let alone classifying body postures into lying, sitting or standing. The purpose of this study was to devise a novel method for accurate classification of body posture using triaxial data from hip-worn accelerometer and to evaluate its performance in free-living conditions against a thigh-worn accelerometer...
November 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29143379/region-dependent-hamstrings-activity-in-nordic-hamstring-exercise-and-stiff-leg-deadlift-defined-with-high-density-emg
#16
András Hegyi, Annamária Péter, Taija Finni, Neil J Cronin
Recent studies suggest region-specific metabolic activity in hamstring muscles during injury prevention exercises, but the neural representation of this phenomenon is unknown. The aim of this study was to examine whether regional differences are evident in the activity of biceps femoris long head (BFlh) and semitendinosus (ST) muscles during two common injury prevention exercises. Twelve male participants without a history of hamstring injury performed the Nordic hamstring exercise (NHE) and stiff-leg deadlift (SDL) while BFlh and ST activity were recorded with high-density electromyography (HD-EMG)...
November 15, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29136305/neural-basis-of-exertional-fatigue-in-the-heat-a-review-of-magnetic-resonance-imaging-methods
#17
REVIEW
X R Tan, Ivan C C Low, Mary C Stephenson, T W Soong, Jason K W Lee
The central nervous system, specifically the brain, is implicated in the development of exertional fatigue under a hot environment. Diverse neuroimaging techniques have been used to visualize the brain activity during or after exercise. Notably, the use of magnetic resonance imaging (MRI) has become prevalent due to its excellent spatial resolution and versatility. This review evaluates the significance and limitations of various brain MRI techniques in exercise studies - brain volumetric analysis, functional MRI, functional connectivity MRI and arterial spin labelling...
November 14, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29130575/a-prospective-investigation-to-evaluate-risk-factors-for-lower-extremity-injury-risk-in-male-youth-soccer-players
#18
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
There is an inherent risk of injury in male youth football; however, pertinent risk factors for injury have yet to be examined. This study used a prospective cohort design with 357 elite male youth football players (aged 10-18 years) assessed during the pre-season period and then monitored during the season recording all non-contact lower extremity injuries. Screening tests included: single leg hop for distance (SLHD); 75% of maximum hop and stick (75%Hop); single leg countermovement jump (SLCMJ); and the tuck jump assessment (TJ)...
November 11, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29130570/cold-water-or-partial-body-cryotherapy-comparison-of-physiological-responses-and-recovery-following-muscle-damage
#19
Erich Hohenauer, Joseph T Costello, Rahel Stoop, Ursula M Küng, Peter Clarys, Tom Deliens, Ron Clijsen
The aim of this study was to compare i) the physiological responses following cold-water immersion (CWI) and partial-body cryotherapy (PBC) and ii) the effects on recovery following a muscle-damaging protocol (5 x 20 drop jumps). Nineteen healthy males were randomly allocated into either a CWI (10 °C for 10 min; n = 9) or a PBC (-60 °C for 30 sec, -135 °C for 2 min; n = 10) group. The physiological variables (thigh muscle oxygen saturation [SmO2 ], cutaneous vascular conductance [CVC], mean-arterial pressure [MAP] and local skin temperature) were assessed immediately prior and up to 60 min post-treatment (10 min intervals)...
November 11, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29130536/adoption-and-use-of-an-injury-prevention-exercise-programme-in-female-football-a-qualitative-study-among-coaches
#20
H Lindblom, S Carlfjord, M Hägglund
This study focuses on an injury prevention exercise programme (IPEP), Knee Control, which has been shown to reduce the incidence of acute knee injury in female adolescent football players. The aim was to explore the factors influencing coaches' adoption and use of Knee Control within female football in Sweden. This was a qualitative study involving interviews with 20 strategically selected coaches for female football teams, predominantly adolescent teams. The semi-structured interview guide was influenced by the Health Belief Model, and an ecological perspective was adopted during the interviews...
November 11, 2017: Scandinavian Journal of Medicine & Science in Sports
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