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Scandinavian Journal of Medicine & Science in Sports

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https://www.readbyqxmd.com/read/28449386/influence-of-a-two-to-six-year-physical-education-intervention-on-scholastic-performance-the-champs-study-dk
#1
Anna Bugge, Sören Möller, Jakob Tarp, Charles H Hillman, Rodrigo Antunes Lima, Anne Kaer Gejl, Heidi Klakk, Niels Wedderkopp
AIM: To investigate the influence of a school-based intervention with a tripling of physical education (PE) lessons from two (90 min) to six lessons per week (270 min) on scholastic performance. METHODS: This study is part of the CHAMPS study-DK, a quasi-experimental study that began in 2008. The intervention group consisted of six schools and the control group consisted of four matched schools (mean age at baseline = 8.4 years, kindergarten class-4(th) grade). Academic performance was extracted from the national test system from 2010- 2014 (Math and Danish were measured at 3(rd) and 6(th) , and 2(nd) , 4(th) and 6(th) grades, respectively)...
April 27, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28449327/skeletal-muscle-il-15-il-15r%C3%AE-and-myofibrillar-protein-synthesis-after-resistance-exercise
#2
Alberto Pérez-López, James McKendry, Marcos Martin-Rincon, David Morales-Alamo, Bárbara Pérez-Köhler, David Valadés, Julia Buján, Jose A L Calbet, Leigh Breen
In vitro and in vivo studies described the myokine IL-15 and its receptor IL-15Rα as anabolic/anti-atrophy agents, however the protein expression of IL-15Rα has not been measured in human skeletal muscle and data regarding IL-15 expression remain inconclusive. The purpose of the study was to determine serum and skeletal muscle IL-15 and IL-15Rα responses to resistance exercise session and to analyse their association with myofibrillar protein synthesis (MPS). Fourteen participants performed a bilateral leg resistance exercise composed of 4 sets of leg press and 4 sets of knee extension at 75% 1RM to task failure...
April 27, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28449312/the-effect-of-sclerotherapy-and-prolotherapy-on-chronic-painful-achilles-tendinopathy-a-systematic-review-including-meta-analysis
#3
REVIEW
Oliver Morath, Eva Johanna Kubosch, Jan Taeymans, Jörn Zwingmann, Lukas Konstantinidis, Norbert P Südkamp, Anja Hirschmüller
Chronic painful AT is a common disorder among athletes. Sclerotherapy (ST) and prolotherapy (AT) are two promising options among the numerous other conservative therapies. Since their efficacy and potential adverse effects (AE) are still unclear, we systematically searched, analysed, and synthesised the available literature on ST and PT for treatingAT. Electronic databases, GoogleScholar and articles' reference lists were searched according to PRISMA guidelines. Eligibility criteria were set up according to the PICOS-scheme including human and animal studies...
April 27, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28449270/strong-association-between-cardiorespiratory-fitness-and-serum-lipoprotein-subclass-pattern-in-prepubertal-healthy-children
#4
Geir Kåre Resaland, Tarja Rajalahti, Eivind Aadland, Olav Martin Kvalheim
AIM: To reveal the lipoprotein subclass pattern associated to cardiorespiratory fitness (CRF) in healthy children. METHODS: Serum concentrations of lipoprotein subclasses and concentrations and average particle size of their main classes were quantified in 94 ethnic Norwegian children using high performance liquid chromatography (HPLC). Twenty-four lipoprotein features were used as input to multivariate regression analysis with CRF measured either as peak oxygen consumption (VO2peak) using a continuous treadmill protocol or indirectly by the 10 minute Andersen intermittent running field test...
April 27, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28415143/cardiorespiratory-fitness-and-health-related-quality-of-life-in-women-at-risk-for-gestational-diabetes
#5
Elina Engberg, Heikki O Tikkanen, Anne Koponen, Harriet Hägglund, Katriina Kukkonen-Harjula, Aila Tiitinen, Juha E Peltonen, Maritta Pöyhönen-Alho
This study examined the associations of cardiorespiratory fitness (CRF) and leisure-time physical activity (LTPA) with health-related quality of life (HRQoL) in women at risk for gestational diabetes mellitus (GDM). The participants were 39 women planning pregnancy with a history of GDM and/or BMI > 29 kg·m(-2) . We assessed CRF by measuring maximal oxygen consumption (O2max ) during incremental cycle ergometer exercise until voluntary fatigue. LTPA was self-reported, and HRQoL assessed with the SF-36 Health Survey (SF-36)...
April 17, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28382758/coaching-is-teamwork-the-role-of-need-supportive-coaching-and-the-motivational-climate-in-stimulating-proactivity-in-volleyball-teams
#6
Stef Van Puyenbroeck, Jeroen Stouten, Gert Vande Broek
Team sports settings are challenging, dynamic environments in which coaches often benefit from proactive players who take initiative in providing valuable suggestions and feedback. Based on self-determination theory and achievement goal theory, the present study examined the mediating role of a mastery and performance motivational climate in the positive relation between coaches' psychological need-supportive behavior and team athletes' proactivity. The study sample consisted of 75 male and 105 female volleyball players (Mage = 21...
April 6, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28378509/hamstring-to-quadriceps-fatigue-ratio-offers-new-and-different-muscle-function-information-than-the-conventional-non-fatigued-ratio
#7
Matheus Daros Pinto, Anthony J Blazevich, Lars L Andersen, Pedro Mil-Homens, Ronei Silveira Pinto
Commonly used injury risk prediction tests such as the hamstring-to-quadriceps (H:Q) strength ratio appear to be poor predictors of non-contact injury. However, these tests are typically performed in a non-fatigued state, despite accumulated fatigue being an important risk factor for both hamstring strain (HS) and anterior cruciate ligament (ACL) injuries in professional soccer players PURPOSE: To examine the influence of neuromuscular fatigue on the H:Q strength ratio and the association between fatigued and non-fatigued ratio scores, after the effect of different H:Q calculation methods were compared and contrasted METHODS: Thirty-five professional soccer players performed a 30-repetition isokinetic fatigue test protocol...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28378501/acl-reconstruction-does-not-induce-further-gamma-loop-abnormalities-on-the-intact-side-of-the-qf-a-longitudinal-study
#8
Yu Konishi
This study aimed to investigate the effect of surgery on the gamma-loop of the quadriceps on the side with an intact knee in patients with ACL injuries. We compared longitudinally the response of alpha motor neurons to vibration stimulation of the quadriceps on the side with an intact knee before and after ACL reconstruction. To evaluate alpha motor neuron response, we measured the maximal knee extension strength and integrated electromyography of the vastus medialis, vastus lateralis, and rectus femoris. After obtaining pre-vibration data from each subject, vibration stimulation was applied to the infrapatellar tendon, and the same measurements were performed immediately after stimulation...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28378465/cutoffs-of-isokinetic-strength-ratio-and-hamstring-strain-prediction-in-professional-soccer-players
#9
M Dauty, P Menu, A Fouasson-Chailloux
Hamstring strain injuries frequently occur during professional soccer practice. Low hamstring strength represents an intrinsic modifiable risk factor but cutoffs of isokinetic knee strength ratios are controversial to predict hamstring strain in professional soccer players. We aimed to predict hamstring strain in accordance with cutoffs of isokinetic knee strength ratios. Bilateral, conventional, and functional isokinetic strength ratios were calculated in 194 professional soccer players at the beginning of 15 consecutive seasons...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28378431/left-ventricular-biomechanics-in-professional-football-players
#10
Thomas G von Lueder, Anders Hodt, Gard F Gjerdalen, Kjetil Steine
Chronic exercise induces adaptive changes of left ventricular (LV) ejection and filling capacities which may be detected by novel speckle-tracking echocardiography (STE) and tissue Doppler imaging (TDI)-based techniques. 103 consecutive male elite Norwegian soccer players and 46 age-matched healthy controls underwent echocardiography at rest. STE was used to assess LV torsional mechanics and LV systolic longitudinal strain (LS). Diastolic function was evaluated by trans-mitral blood flow, mitral annular velocities by TDI, and LV inflow propagation velocity by colour M-mode...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28378372/microcirculation-after-achilles-tendon-rupture-correlates-with-functional-and-patient-reported-outcome
#11
Praxitelis Praxitelous, Gunnar Edman, Paul W Ackermann
INTRODUCTION: Patients with acute Achilles tendon rupture (ATR) display an extended healing process with varying clinical outcome. Poor microcirculatory blood flow has been suggested to be a significant factor for the healing process. However, whether microcirculation may predict healing outcome has been mostly unknown. Therefore, we investigated if blood flow in the Achilles tendon may be associated with patient-reported and functional outcomes after ATR. METHODS: In vivo laser Doppler flowmetry was used to assess microvascular blood flow bilateral in the Achilles tendons, during post-occlusive reactive hyperemia, of nine patients with acute total ATR at two weeks post-operatively...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28376240/the-development-of-the-physical-fitness-construct-across-childhood
#12
Till Utesch, Dennis Dreiskämper, Bernd Strauss, Roland Naul
The measurement of physical fitness (PF) is an important factor from many different perspectives. PF is a determinant of healthy child development as it is related to several health outcomes. However, existing taxonomies of the construct and frequently used fitness assessments vary concerning their theoretical assumptions and practical implications. From a theoretical perspective, the construct of physical fitness covers a variety of motor domains, such as cardiovascular endurance, strength, coordination, or flexibility (e...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28370538/shoulder-position-sense-in-volleyball-players-with-infraspinatus-atrophy-secondary-to-suprascapular-nerve-neuropathy
#13
Samuele Contemori, Andrea Biscarini
Isolated infraspinatus atrophy (IIA) is a common condition among overhead-activity athletes, which affects the hitting shoulder and is caused by suprascapular nerve injury. Since the suprascapular nerve is a mixed nerve, such damage could lead to reduced afferent proprioceptive information and impaired shoulder sensorimotor control. This study aims to evaluate the proprioception of the shoulder with IIA, through the assessment of shoulder position sense. The shoulder position sense was assessed in 24 professional volleyball players (12 players with IIA, and 12 healthy players) with a blind dynamic shoulder repositioning test (all participants were blindfolded during the test)...
March 29, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28345173/increasing-preferred-step-rate-during-running-reduces-plantar-pressures
#14
James M Gerrard, Daniel R Bonanno
Increasing preferred step rate during running is a commonly used strategy in the management of running-related injuries. This study investigated the effect of different step rates on plantar pressures during running. Thirty-two healthy runners ran at a comfortable speed on a treadmill at five step rates (preferred, ±5%, and ±10%). For each step rate, plantar pressure data were collected using the pedar-X in-shoe system. Compared to running with a preferred step rate, a 10% increase in step rate significantly reduced peak pressure (144...
March 27, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28345160/increasing-skeletal-muscle-carnitine-availability-does-not-alter-the-adaptations-to-high-intensity-interval-training
#15
Christopher E Shannon, Reza Ghasemi, Paul L Greenhaff, Francis B Stephens
Increasing skeletal muscle carnitine availability alters muscle metabolism during steady-state exercise in healthy humans. We investigated whether elevating muscle carnitine, and thereby the acetyl-group buffering capacity, altered the metabolic and physiological adaptations to 24 weeks of high-intensity interval training (HIIT) at 100% maximal exercise capacity (Wattmax ). Twenty-one healthy male volunteers (age 23±2 years; BMI 24.2±1.1 kg/m(2) ) performed 2x3 minute bouts of cycling exercise at 100% Wattmax , separated by five minutes rest...
March 27, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28329441/a-framework-for-the-etiology-of-running-related-injuries
#16
REVIEW
M L Bertelsen, A Hulme, J Petersen, R K Brund, H Sørensen, C F Finch, E T Parner, R O Nielsen
The etiology of running-related injury is important to consider as the effectiveness of a given running-related injury prevention intervention is dependent on whether etiologic factors are readily modifiable and consistent with a biologically plausible causal mechanism. Therefore, the purpose of the present article was to present an evidence-informed conceptual framework outlining the multifactorial nature of running-related injury etiology. In the framework, four mutually exclusive parts are presented: (a) Structure-specific capacity when entering a running session; (b) structure-specific cumulative load per running session; (c) reduction in the structure-specific capacity during a running session; and (d) exceeding the structure-specific capacity...
March 22, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28329413/physical-activity-muscular-strength-and-polypharmacy-among-older-multimorbid-persons-results-from-the-kora-age-study
#17
K A Volaklis, B Thorand, A Peters, M Halle, M Heier, B Strasser, U Amann, K H Ladwig, H Schulz, W Koenig, C Meisinger
The purpose of this study was to examine if physical activity (PA) and muscular strength (MS) are related to polypharmacy. Our cross-sectional analysis was based on 711 patients with multimorbidity (ΜΜΒ), aged 65-94 years, who participated in the KORA-Age study. Participants underwent a face to face interview and extensive physical examinations including anthropometric measurements, registration of chronic diseases, determination of health-related behaviors (smoking, alcohol intake, physical activity, etc), collection of blood samples and measurement of hand-grip strength...
March 22, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28329411/tv-viewing-time-is-associated-with-increased-all-cause-mortality-in-brazilian-adults-independent-of-physical-activity
#18
Bruna Camilo Turi, Henrique Luiz Monteiro, Ítalo Ribeiro Lemes, Jamile Sanches Codogno, Kyle Robinson Lynch, Camila Angélica Asahi Mesquita, Rômulo Araújo Fernandes
The purpose of this study was to investigate the association between television (TV) viewing and all-cause mortality among Brazilian adults after six years of follow-up. This longitudinal study started in 2010 in the city of Bauru, SP, Brazil, and involved 970 adults aged ≥ 50 years. Mortality was reported by relatives and confirmed in medical records of the Brazilian National Health System. Physical activity (PA) and TV viewing were assessed by the Baecke questionnaire. Health status, sociodemographic and behavioural covariates were considered as potential confounders...
March 22, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28321925/effects-of-6-month-aerobic-interval-training-on-skeletal-muscle-metabolism-in-middle-aged-metabolic-syndrome-patients
#19
A Guadalupe-Grau, V E Fernández-Elías, J F Ortega, F Dela, J W Helge, R Mora-Rodriguez
Aerobic interval training (AIT) improves the health of metabolic syndrome patients (MetS) more than moderate intensity continuous training. However, AIT has not been shown to reverse all metabolic syndrome risk factors, possibly due to the limited duration of the training programs. Thus, we assessed the effects of 6 months of AIT on cardio-metabolic health and muscle metabolism in middle-aged MetS. Eleven MetS (54.5±0.7 years old) underwent 6 months of 3 days a week supervised AIT program on a cycle ergometer...
March 21, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28314091/changes-in-muscle-architecture-of-biceps-femoris-induced-by-eccentric-strength-training-with-nordic-hamstring-exercise
#20
D Alonso-Fernandez, P Docampo-Blanco, J Martinez-Fernandez
Eccentric strength training alters muscle architecture, but it is also an important factor for the prevention of hamstring injuries. The purpose was to determine the architectural adaptations of the biceps femoris long head (BFlh) after eccentric strength training with nordic hamstring exercise (NHE), followed by a subsequent detraining period. The participants in this intervention (n=23) completed a period of 13 weeks consisting of a first week of control and prior training, followed by 8 weeks of eccentric strength training with NHE, and concluding with a 4-week period of detraining...
March 17, 2017: Scandinavian Journal of Medicine & Science in Sports
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