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Scandinavian Journal of Medicine & Science in Sports

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https://www.readbyqxmd.com/read/28805932/muscle-thickness-correlates-to-muscle-cross-sectional-area-in-the-assessment-of-strength-training-induced-hypertrophy
#1
Martino V Franchi, Stefano Longo, Joanne Mallinson, Jonathan I Quinlan, Tariq Taylor, Paul L Greenhaff, Marco V Narici
AIM: Muscle thickness (MT) measured by ultrasound has been used to estimate cross-sectional area (measured by CT and MRI) at a single time-point. We tested whether MT could be used as a valid marker of MRI determined muscle anatomical cross-sectional area (ACSA) and volume changes following resistance training (RT). METHODS: Nine healthy, young, male volunteers (24±2 y.o., BMI 24.1±2.8 kg/m(2) ) had vastus lateralis (VL) muscle volume (VOL) and ACSA mid (at 50% of femur length, FL) assessed by MRI, and VL MT measured by ultrasound at 50% FL...
August 14, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28801988/prompt-scanning-and-quantification-of-lumbar-muscles-seeing-the-butterly
#2
Eda Gürçay, Murat Kara, Bayram Kaymak, Abdullah Ruhi Soylu, Levent Özçakar
We have taken interest in the article by Hides and Stanton which has been published in your journal (Hides et al., 2017). First, we congratulate the authors for their effort in calling attention to the use of ultrasound (US) for scanning the multifidus and quadratus lumborum (QL) muscles. Errors in quantification might stem mainly from two reasons; failure to capture an appropriate image and failure to technically quantify it (Özçakar et al., 2011 and 2013). This article is protected by copyright. All rights reserved...
August 12, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28801974/heritability-estimates-of-endurance-related-phenotypes-a-systematic-review-and-meta-analysis
#3
Eri Miyamoto-Mikami, Hirofumi Zempo, Noriyuki Fuku, Naoki Kikuchi, Motohiko Miyachi, Haruka Murakami
The aim of this study was to clarify heritability estimates for endurance-related phenotypes and the underlying factors affecting these estimates. A systematic literature search was conducted for studies reporting heritability estimates of endurance-related phenotypes using the PubMed database (up to September 30, 2016). Studies that estimated the heritability of maximal oxygen uptake (VO2 max), submaximal endurance phenotypes, and endurance performance were selected. The weighted mean heritability for endurance-related phenotypes was calculated using a random-effects model...
August 12, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28801950/can-chronic-stretching-change-the-muscle-tendon-mechanical-properties-a-review
#4
REVIEW
Sandro R Freitas, Bruno Mendes, Guillaume Le Sant, Ricardo J Andrade, Antoine Nordez, Zoran Milanovic
PURPOSE: It is recognized that stretching is an effective method to chronically increase the joint range of motion. However, the effects of stretching training on the muscle-tendon structural properties remain unclear. This systematic review with meta-analysis aimed to determine whether chronic stretching alter the muscle-tendon structural properties. METHODS: Published papers regarding longitudinal stretching (static, dynamic and/or PNF) intervention (either randomized or not) in humans of any age and health status, with more than 2 weeks in duration and at least 2 sessions per week, were searched in PubMed, PEDro, ScienceDirect and ResearchGate databases...
August 12, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28782303/incidence-and-body-location-of-reported-acute-sports-injuries-in-seven-sports-using-a-national-insurance-database
#5
Malin Åman, Magnus Forssblad, Karin Larsén
Sports with high numbers of athletes and acute injuries are an important target for preventive actions at a national level. Both for the health of the athlete and to reduce costs associated with injury. The aim of the present study was to identify injuries where injury prevention should focus, in order to have major impact on decreasing acute injury rates at a national level. All athletes in the seven investigated sport federations (automobile sports, basketball, floorball, football (soccer), handball, ice hockey, and motor sports) were insured by the same insurance company...
August 7, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28759130/the-joint-impact-of-prediagnostic-inflammatory-markers-and-cardiorespiratory-fitness-on-the-risk-of-cancer-mortality
#6
Perfenia Paul Pletnikoff, Jari A Laukkanen, Tomi-Pekka Tuomainen, Sudhir Kurl
Independently, cardiorespiratory fitness (CRF), C-reactive protein (CRP) and leukocyte count have been shown to predict cancer death. Little is known about the joint impact of CRF and prediagnostic markers of inflammation, particularly leukocyte count and CRP, and their prognostic value with cancer death. The aim of this study was to explore the association between prediagnostic inflammatory markers and CRF with cancer mortality. A population-based cohort of 2270 men from Eastern Finland with no cancer history at baseline participated in the study...
July 31, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28759129/the-effect-of-a-two-year-school-based-daily-physical-activity-intervention-on-a-clustered-cvd-risk-factor-score-the-sogndal-school-intervention-study
#7
G K Resaland, E Aadland, A K O Nilsen, J B Bartholomew, L B Andersen, S A Anderssen
PURPOSE: To evaluate changes in clustered cardiovascular disease (CVD) risk factors in 9-year-old children following a 2-year school-based physical activity intervention. METHODS: In total, 259 children (age 9.3 ± 0.3 years) were invited, of whom 256 participated. The intervention group (63 boys, 62 girls) carried out 60-minute teacher-controlled daily physical activity over two school years. The control group (62 boys, 69 girls) had the curriculum-defined amount of physical education (45 minutes twice each week)...
July 31, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28759127/kinematic-stride-cycle-asymmetry-is-not-associated-with-sprint-performance-and-injury-prevalence-in-athletic-sprinters
#8
Thomas Haugen, Jørgen Danielsen, David McGhie, Øyvind Sandbakk, Gertjan Ettema
The aims of this study were to i) quantify the magnitude of kinematic stride cycle asymmetry in high-level athletic sprinters, ii) explore the association between kinematic asymmetry and maximal sprint running performance, and iii) investigate possible associations between kinematic asymmetry and injury prevalence. Twenty-two competitive sprinters (age 23 ±3 yr, height 1.81 ±0.06 m, body mass 75.5 ±5.6 kg, personal best 100-m 10.86 ±0.22 s) performed 2-3 flying sprints over 20 m. Kinematics were recorded in 3D using a motion tracking system with 21 cameras at a 250 Hz sampling rate, allowing assessment of six consecutive steps for each athlete...
July 31, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28759126/ep2-receptor-plays-pivotal-roles-in-generating-mechanical-hyperalgesia-after-lengthening-contraction
#9
Hiroki Ota, Kimiaki Katanosaka, Shiori Murase, Tomoyuki Furuyashiki, Shuh Narumiya, Kazue Mizumura
INTRODUCTION: We previously demonstrated that nerve growth factor (NGF) and glial cell line-derived neurotrophic factor (GDNF) were upregulated after lengthening contraction (LC) in exercised muscle through B2 bradykinin receptor activation and cyclooxygenase (COX)-2 upregulation, respectively, and that these trophic factors sensitized nociceptors resulting in mechanical hyperalgesia (delayed-onset muscle soreness, DOMS). Here we examined the prostaglandin receptor subtype involved in DOMS...
July 31, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28742272/longitudinal-associations-between-exercise-identity-and-exercise-motivation-a-multilevel-growth-curve-model-approach
#10
Nikos Ntoumanis, Andreas Stenling, Cecilie Thøgersen-Ntoumani, Symeon Vlachopoulos, Magnus Lindwall, Daniel F Gucciardi, Christos Tsakonitis
OBJECTIVES: Past work linking exercise identity and exercise motivation has been cross-sectional. This is the first study to model the relations between different types of exercise identity and exercise motivation longitudinally. Understanding the dynamic associations between these sets of variables has implications for theory development and applied research. DESIGN: Longitudinal survey study. METHODS: Participants were 180 exercisers (79 men, 101 women) from Greece, who were recruited from fitness centres and were asked to complete questionnaires assessing exercise identity (exercise beliefs and role identity) and exercise motivation (intrinsic, identified, introjected, external motivation, and amotivation) three times within a six month period...
July 25, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28730749/impact-of-the-dynamic-and-static-component-of-the-sport-practiced-for-electrocardiogram-analysis-in-screening-athletes
#11
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
#12
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
#13
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
#14
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
#15
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
#16
R Verrelst, D Van Tiggelen, R De Ridder, E Witvrouw
The link between dynamic range of motion (dROM) parameters within the kinematic chain and the development of lower extremity (LE) injury has 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
#17
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
#18
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
#19
Hiromasa Ueno, Tadashi Suga, Kenji Takao, Takahiro Tanaka, Jun Misaki, Yuto Miyake, Akinori Nagano, Tadao Isaka
This 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
#20
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
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