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Scandinavian Journal of Medicine & Science in Sports

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https://www.readbyqxmd.com/read/27917543/is-motivation-for-marathon-a-protective-factor-or-a-risk-factor-of-injury
#1
A Chalabaev, R Radel, I Ben Mahmoud, B Massiera, T Deroche, F d'Arripe-Longueville
This research investigated whether and how self-determined motivation predicts perceived susceptibility to injury during competition (marathon). Two correlational studies including 378 (Study 1) and 339 (Study 2) marathon runners were conducted. Participants filled out a questionnaire the day before the race measuring self-determined motivation, perceived susceptibilities to marathon-related injury and to keep running through pain, and control variables. Study 1 showed that self-determined motivation was negatively related to perceived susceptibility to marathon-related injury...
December 5, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27905148/simultaneous-validation-of-five-activity-monitors-for-use-in-adult-populations
#2
C Powell, B P Carson, K P Dowd, A E Donnelly
Numerous cut-points exist to measure physical activity by accelerometry. The ability to compare accelerometer findings from different devices from different locations may be advantageous to researchers. This study aimed to develop and validate cut-points for 1.5, 3, and 6 METs in five activity monitors simultaneously. Fifty-six participants (mean age=39.9 [±11.5] years) performed six activities while wearing a CosMED K4b(2) and five activity monitors: activPAL3 Micro, activPAL, ActiGraph GT1M, ActiGraph wGT3X-BT, and GENEActiv...
December 1, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27905147/reduced-nondominant-lumbar-multifidi-cross-sectional-area-is-a-precursor-of-low-back-injury-in-cricket-fast-bowlers
#3
B Olivier, N Gillion, A V Stewart, W McKinon
Asymmetry in the lumbar multifidi muscle (LM) cross-sectional area (CSA) is associated with low back injury. The aim of this prospective cohort study was to investigate the symmetry of the CSA of LM at L3, L4, and L5, in the context of simultaneous injury monitoring. Injury free, male, right-handed cricket fast bowlers playing at a nonprofessional level participated in this study. LM CSA at L3, L4, and L5 vertebral levels was measured through the use of ultrasound imaging in prone. The primary outcome measure of the study was the incidence of an injury during a cricket season of eight-month duration...
December 1, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27882632/rocking-the-boat-does-perfect-rowing-crew-synchronization-reduce-detrimental-boat-movements
#4
L S Cuijpers, P J M Passos, A Murgia, A Hoogerheide, K A P M Lemmink, H J de Poel
In crew rowing, crew members need to mutually synchronize their movements to achieve optimal crew performance. Intuitively, poor crew coordination is often deemed to involve additional boat movements such as surge velocity fluctuations, heave, pitch, and roll, which would imply lower efficiency (eg, due to increased hydrodynamic drag). The aim of this study was to investigate this alleged relation between crew coordination and boat movements at different stroke rates. Fifteen crews of two rowers rowed in a double scull (ie, a two-person boat) at 18, 22, 26, 30, and 34 strokes per minute...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27882617/heritability-estimates-of-muscle-strength-related-phenotypes-a-systematic-review-and-meta-analysis
#5
H Zempo, E Miyamoto-Mikami, N Kikuchi, N Fuku, M Miyachi, H Murakami
The purpose of this study was to clarify the heritability estimates of human muscle strength-related phenotypes (H(2) -msp). A systematic literature search was conducted using PubMed (through August 22, 2016). Studies reporting the H(2) -msp for healthy subjects in a sedentary state were included. Random-effects models were used to calculate the weighted mean heritability estimates. Moreover, subgroup analyses were performed based on phenotypic categories (eg, grip strength, isotonic strength, jumping ability)...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27882611/chronic-lactate-supplementation-does-not-improve-blood-buffering-capacity-and-repeated-high-intensity-exercise
#6
L F Oliveira, V de Salles Painelli, K Nemezio, L S Gonçalves, G Yamaguchi, B Saunders, B Gualano, G G Artioli
Since there is conflicting data on the buffering and ergogenic properties of calcium lactate (CL), we investigated the effect of chronic CL supplementation on blood pH, bicarbonate, and high-intensity intermittent exercise performance. Sodium bicarbonate (SB) was used as a positive control. Eighteen athletes participated in this double-blind, placebo-controlled, crossover, fully counterbalanced study. All participants underwent three different treatments: placebo (PL), CL, and SB. The dose was identical in all conditions: 500 mg/kg BM divided into four daily individual doses of 125 mg/kg BM, for five consecutive days, followed by a 2-7-day washout period...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27882607/fear-of-failure-psychological-stress-and-burnout-among-adolescent-athletes-competing-in-high-level-sport
#7
H Gustafsson, S S Sagar, A Stenling
The purpose of this study was to investigate fear of failure in highly competitive junior athletes and the association with psychological stress and burnout. In total 258 athletes (152 males and 108 females) ranged in age from 15 to 19 years (M = 17.4 years, SD = 1.08) participated. Athletes competed in variety of sports including both team and individual sports. Results showed in a variable-oriented approach using regression analyses that one dimension, fear of experiencing shame and embarrassment had a statistically significant effect on perceived psychological stress and one dimension of burnout, reduced sense of accomplishment...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27882605/placebo-in-sports-nutrition-a-proof-of-principle-study-involving-caffeine-supplementation
#8
B Saunders, L F de Oliveira, R P da Silva, V de Salles Painelli, L S Gonçalves, G Yamaguchi, T Mutti, E Maciel, H Roschel, G G Artioli, B Gualano
We investigated the effects of supplement identification on exercise performance with caffeine supplementation. Forty-two trained cyclists (age 37 ± 8 years, body mass [BM] 74.3 ± 8.4 kg, height 1.76 ± 0.06 m, maximum oxygen uptake 50.0 ± 6.8 mL/kg/min) performed a ~30 min cycling time-trial 1 h following either 6 mg/kgBM caffeine (CAF) or placebo (PLA) supplementation and one control (CON) session without supplementation. Participants identified which supplement they believed they had ingested ("caffeine", "placebo", "don't know") pre- and post-exercise...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27882600/muscular-fitness-and-metabolic-and-inflammatory-biomarkers-in-adolescents-results-from-labmed-physical-activity-study
#9
C A Agostinis-Sobrinho, C Moreira, S Abreu, L Lopes, L B Sardinha, J Oliveira-Santos, A Oliveira, J Mota, R Santos
This study aimed to evaluate the associations between muscular fitness and inflammatory biomarkers and to investigate the relationship between muscular fitness and selected clustered inflammatory biomarkers in adolescents. This is a cross-sectional analysis with 529 adolescents (267 girls) aged 12-18 years. Handgrip strength and standing long jump tests assessed MF. Continuous scores of clustered inflammatory biomarkers (sum of Z-scores of C-reactive protein [CRP], C3, C4, fibrinogen, and leptin); metabolic risk factor (MRF) score (sum of Z-scores of SBP, triglycerides, ratio total cholesterol [TC]/HDL, HOMA-IR, and waist circumference [WC]) were computed...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27878845/evaluation-of-raw-acceleration-sedentary-thresholds-in-children-and-adults
#10
Maria Hildebrand, Bjørge H Hansen, Vincent T van Hees, Ulf Ekelund
The aim was to develop sedentary (sitting/lying) thresholds from hip and wrist worn raw tri-axial acceleration data from the ActiGraph and GENEActiv, and to examine the agreement between free-living time spent below these thresholds with sedentary time estimated by the activPAL. Sixty children and adults wore an ActiGraph and GENEActiv on the hip and wrist while performing six structured activities, before wearing the monitors, in addition to an activPAL, for 24 h. Receiver operating characteristic (ROC) curves were used to determine sedentary thresholds based on activities in the laboratory...
November 22, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27859725/effects-of-menthol-application-on-the-skin-during-prolonged-immersion-in-swimmers-and-controls
#11
P G Botonis, N D Geladas, S N Kounalakis, E D Cherouveim, M D Koskolou
We hypothesized that menthol application on the skin would enhance vasoconstriction of subjects immersed in cool water, which would reduce heat loss and rectal temperature (Tre) cooling rate. Furthermore, it was hypothesized that this effect would be greater in individuals acclimatized to immersion in 24 °C water, such as swimmers. Seven swimmers (SW) and seven physical education students (CON) cycled at 60% VO2 max until Tre attained 38 °C, and were then immediately immersed in stirred water maintained at 24 °C on two occasions: without (NM) and with (M; 4...
November 18, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27859723/how-stressors-are-dynamically-appraised-within-a-team-during-a-game-an-exploratory-study-in-basketball
#12
J Doron, J Bourbousson
Little is known about how team sport athletes individually and collectively experience sources of stress during competitive sport encounters. This study aimed to examine the nature of the stressors team sport athletes appraised during games at individual and team levels, as well as their degree of synchronization during an unfolding game. Through individual self-confrontation interviews, the activities of nine basketball players of the same team were examined in detail. The results revealed that 12 categories of stressors were reported, and categorized into two larger units reflecting stressors perceived as affecting (a) "the team functioning as a whole" and (b) "a player's own functioning"...
November 18, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27859711/red-cell-volume-response-to-exercise-training-association-with-aging
#13
REVIEW
D Montero, C Lundby
Red blood cell volume (RBCV) is a main determinant of cardiorespiratory fitness in healthy individuals. However, it remains controversial to what extent exercise training (ExT) enhances RBCV. Therefore, we sought to systematically review and determine the effect of ExT on RBCV in healthy individuals across all ages. We conducted a systematic search of MEDLINE, Scopus, and Web of Science, since their inceptions until February 2016 for articles assessing the effect of ExT interventions (not including hypoxic training) on blood volumes in healthy individuals...
November 18, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27790760/acute-exercise-and-motor-memory-consolidation-does-exercise-type-play-a-role
#14
R Thomas, M Flindtgaard, K Skriver, S S Geertsen, L Christiansen, L Korsgaard Johnsen, D V P Busk, E Bojsen-Møller, M J Madsen, C Ritz, M Roig, J Lundbye-Jensen
A single bout of high-intensity exercise can augment off-line gains in skills acquired during motor practice. It is currently unknown if the type of physical exercise influences the effect on motor skill consolidation. This study investigated the effect of three types of high-intensity exercise following visuomotor skill acquisition on the retention of motor memory in 40 young (25.3 ±3.6 years), able-bodied male participants randomly assigned to one of four groups either performing strength training (STR), circuit training (CT), indoor hockey (HOC) or rest (CON)...
October 27, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27781314/changes-in-physical-activity-and-sedentary-time-in-the-finnish-schools-on-the-move-program-a-quasi-experimental-study
#15
Henna L Haapala, Mirja H Hirvensalo, Janne Kulmala, Harto Hakonen, Anna Kankaanpää, Kaarlo Laine, Lauri Laakso, Tuija H Tammelin
The aim of the Finnish Schools on the Move program is to create a more active and pleasant school day through physical activity (PA). In this quasi-experimental design, we compared changes in moderate-to-vigorous-intensity physical activity (MVPA) and sedentary time (ST) during the school day and outside school hours for Grades 1-9 over two academic years in four program schools and two reference schools. Altogether 319 girls and boys aged 7-15 participated in the study between 2010 and 2012. MVPA and ST were measured four times over the 1...
October 26, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27781307/composition-and-adaptation-of-human-myotendinous-junction-and-neighboring-muscle-fibers-to-heavy-resistance-training
#16
J R Jakobsen, A L Mackey, A B Knudsen, M Koch, M Kjaer, M R Krogsgaard
The myotendinous junction (MTJ) is a common site of strain injury and yet understanding of its composition and ability to adapt to loading is poor. The main aims of this study were to determine the profile of selected collagens and macrophage density in human MTJ and adjoining muscle fibers, and to investigate whether heavy exercise loading would alter this profile. Fifteen individuals scheduled for anterior cruciate ligament repair surgery were randomized into three groups: control, acute or 4 weeks heavy resistance training...
October 26, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27781306/flexibility-is-associated-with-motor-competence-in-schoolchildren
#17
L Lopes, S Póvoas, J Mota, A D Okely, M J Coelho-E-Silva, D P Cliff, V P Lopes, R Santos
Available data on the associations between motor competence (MC) and flexibility are limited and result inconclusive. This study aims to examine the relationship between flexibility and MC in children. The sample comprised 596 Portuguese children (47.1% girls) aged 9.7 ± 0.6 years. Motor competence was evaluated with the body coordination test, Körperkoordination Test für Kinder. Cardiorespiratory fitness (20-m shuttle run), muscular strength (curl-up and push-up tests), and flexibility (back-saver sit and reach and trunk-lift tests) were evaluated using the Fitnessgram Test Battery...
October 26, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27747944/validity-of-a-single-question-to-assess-habitual-physical-activity-of-community-dwelling-older-people
#18
E Portegijs, S Sipilä, A Viljanen, M Rantakokko, T Rantanen
The aim is to determine concurrent validity of a single self-report habitual physical activity (PA) question against accelerometer-based PA and mobility variables, and corresponding changes in self-reported PA and mobility. Cross-sectional and longitudinal data of the "Life-space mobility in old age" (LISPE) cohort and its substudy on PA were utilized. At baseline, 848 community-dwelling, 75- to 90-year-old people living independently in central Finland participated in home-based interviews. One and 2 years later, 816 and 761 of them were reassessed by phone, respectively...
October 17, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27747938/health-problems-in-former-elite-female-football-players-prevalence-and-risk-factors
#19
A Prien, B Prinz, J Dvořák, A Junge
The aim of this study was to assess the prevalence of health problems and associated risk factors in former elite female football players. A cross-sectional research design was employed, using an online questionnaire on personal characteristics and health complaints during/after the career. One hundred fifty-two (response rate: 62.0%) former first German league players answered the survey. Around 70% described their current health as good or very good. Over half (57.9%) reported knee problems during the last 4 weeks while exercising and a third (33...
October 17, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27747935/biomechanical-differences-related-to-leg-dominance-were-not-found-during-a-cutting-task
#20
E K Greska, N Cortes, S I Ringleb, J A Onate, B L Van Lunen
Previous studies have shown conflicting information regarding leg dominance as an etiological factor for the risk of anterior cruciate ligament (ACL) injuries. It remains unclear if lower extremity neuromechanical limb asymmetries exist in experienced athletes. The purpose of this study was to evaluate lower extremity neuromechanical effects of leg dominance in female collegiate soccer athletes during an unanticipated side-step cutting task. Twenty female collegiate soccer players completed an unanticipated side-step cutting task, using their dominant and non-dominant legs...
October 17, 2016: Scandinavian Journal of Medicine & Science in Sports
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