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PubMed Journal Database | Scandinavian journal of medicine & science in sports RSS

11:23 EDT 23rd July 2018 | BioPortfolio

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Showing PubMed Articles 1–25 of 204 from Scandinavian journal of medicine & science in sports

Does normalization of voluntary EMG amplitude to M account for the influence of electrode location and adiposity?

Voluntary surface electromyography (sEMG) amplitude is known to be influenced by both electrode position and subcutaneous adipose tissue thickness, and these factors likely compromise both between- and within-individual comparisons. Normalization of voluntary sEMG amplitude to evoked maximum M-wave parameters [M peak-to-peak (P-P) and Area] may remove the influence of electrode position and subcutaneous tissue thickness. The purpose of this study was to: (i) assess the influence of electrode position on vol...

Longitudinal associations between weather, season, and mode of commuting to school amongst Spanish youths.

To study the associations of weather conditions with the travel mode choice for commuting to and from school.

Altitude-induced responses observed in the control group.

The study by Robach et al. aimed to test the hypothesis that LHTL in hypobaric hypoxia improves exercise performance in elite endurance athletes. The authors have to be commended for this logistical challenge of having two VO -matched groups training together between 600 and 1500m but either sleeping at 2207m (LHTL, n = 11) or at 1035 m (Control, n = 8). This protocol allows a good matching of the training loads and it was expected that it could "isolate" the specific effects of hypoxia in the LHTL group....

Response to Millet and Brocherie.

Millet and Brocherie argue that responses to altitude could have occurred in our control group living and training at 1000-1500 m. First, their argumentation is somewhat imprecise since the participants lived at 1035 m and spent 82% of total training time between 550 and 1100 m. Second, their statement is surprising since in one of their own studies the authors deemed it acceptable to compare a control group living and training at 1150 m to a LHTL group living at 2250 m. Most importantly, however, Millet an...

Effects of Football Simulated Fatigue on Neuromuscular Function and Whole-body Response to Disturbances in Balance.

The effect of football specific fatigue on explosive neuromuscular performance and dynamic balance has received little attention in the literature despite the potential consequences for injury risk. This study aimed to investigate the effect of fatigue induced by simulated football match-play on maximal and explosive knee flexor (KF) and knee extensor (KE) torque, and thus the maximal and explosive KF/KE ratio, as well as the effect of fatigue induced by simulated football match-play on whole-body response ...

Exercise training in overweight and obese children: Recreational football and high-intensity interval training provide similar benefits to physical fitness.

This study compared the effects of recreational football and high-intensity interval training (HIIT) on body composition, muscular fitness, and cardiorespiratory fitness in overweight and obese children. Forty-two overweight/obese males aged 11-13 years [body mass index (BMI) >20.5 kg/m ] were randomly assigned to a recreational football training group (n = 14; 157.9 ± 5.8 cm; 63.7 ± 12.6 kg), HIIT group (n = 14; 163.8 ± 9.4 cm; 71.5 ± 10.5 kg), or nontraining control group (n = 14; ...

Whole body biomechanical differences between limbs exist 9 months after ACL reconstruction across jump/landing tasks.

Previous studies examining jump tasks after anterior cruciate ligament reconstruction (ACLR) have focused on performance measures without examining joint kinematic and kinetic variables. The aim of this study was to identify differences in biomechanical and performance measures between limbs across tests nine months after surgery.

Left ventricular function during exercise in trained pre-adolescent soccer players.

It is unclear, what the underlying cardiovascular mechanisms are that give rise to the high level of aerobic fitness seen in youth soccer players. The aim of the study was to evaluate global and regional markers of systolic and diastolic function in a group of pre-adolescent soccer players during an incremental exercise test. Twenty-two, male soccer players (SP) from two professional soccer clubs (age: 12.0 ± 0.3 years) volunteered for the study. Fifteen recreationally active boys (CON), of similar age (ag...

Effects of Interval Aerobic Training Program with Recovery bouts on cardiorespiratory and endurance fitness in seniors.

Interval aerobic training programs (IATP) improve cardiorespiratory and endurance parameters. They are however unsuitable to seniors as frequently associated with occurrence of exhaustion and muscle pain. The purpose of this study was to measure the benefits of an IATP designed with recovery bouts (IATP-R) in terms of cardiorespiratory and endurance parameters and its acceptability among seniors (≥70 years). Sedentary healthy volunteers were randomly assigned either to IATP-R or sedentary lifestyle. All p...

Examination of muscle morphology and neuromuscular function in normal weight and overfat children aged 7 to 10 years.

Neuromuscular function in young overweight/obese (OF) children is not well described.

Identifying the best body weight-status index associated with metabolic risk in youth.

This study investigated the association of six different anthropometric markers with metabolic syndrome to find the most suited to predict children at risk. Sample comprises 1324 Portuguese youth (701 girls, 623 boys), aged 10-17 years. Six anthropometric markers were included: body mass index (BMI), BMI z-score, tri-ponderal index (TPI), waist circumference (WC), WC/height ratio (WC/H), and WC/H adjusted ratio (WC/H ). A standardized metabolic risk score (zMR) was computed by summing of standardized values...

Validity of Hip-worn Inertial Measurement Unit Compared to Jump Mat for Jump Height Measurement in Adolescents.

Jump tests assess lower body power production capacity, and can be used to evaluate athletic ability and development during growth. Wearable inertial measurement units (IMU) seem to offer a feasible alternative to laboratory-based equipment for jump height assessments. Concurrent validity of these devices for jump height assessments has only been established in adults. Therefore, the purpose of this study was to evaluate the concurrent validity of IMU-based jump height estimate compared to contact mat-based...

Evidence of balance training-induced improvement in soccer-specific skills in U11 soccer players.

The present study aim was to determine the role of balance training in improving technical soccer skills in young players. Two U11 soccer teams were randomly assigned one to either balance training (BT; n=22) or control group (Ctrl; n=21). At the end of their habitual soccer training (identical in BT and Ctrl), BT underwent additional balance training for 12 weeks (3sessions/week, 20 min per session), while Ctrl had a 20-min scrimmage. Before and after the intervention, BT and Ctrl underwent two soccer-spec...

Inflection points in longitudinal models: Tracking recovery and return to play following concussion.

The return to play (RTP) process may occur during longitudinal studies tracking recovery after concussion. This factor, which is often omitted within statistical designs, could affect the fit and overall interpretation of the statistical model. This paper demonstrates the difference in results and interpretation between two linear mixed-model designs; 1) a between-group longitudinal (GROUP) analysis; and 2) a between-group longitudinal model that used an inflection point to account for changes around the ti...

Incidence and risk factors for back pain in young floorball and basketball players: a prospective study.

The aim of this study was to investigate the incidence of back pain in young basketball and floorball players under 21 years of age. The secondary aim was to examine risk factors especially for low back pain (LBP). Nine basketball and nine floorball teams (n=396) participated in this prospective follow-up study (2011-2014). Young athletes (mean age 15.8±1.9) performed physical tests and completed a questionnaire at baseline. The follow-up lasted one to three years per player. During the follow-up, back pai...

Influence of averaging method on muscle deoxygenation interpretation during repeated-sprint exercise.

Near-infrared spectroscopy (NIRS) is a common tool used to study oxygen availability and utilisation during repeated-sprint exercise. However, there are inconsistent methods of smoothing and determining peaks and nadirs from the NIRS signal, which make interpretation and comparisons between studies difficult. To examine the effects of averaging method on deoxy-haemoglobin concentration ([HHb]) trends, nine males performed ten 10-s sprints, with 30 s of recovery, and six analysis methods were used for determ...

The validity of the 4-Skills Scan: A double validation study.

Adequate gross motor skills are an essential aspect of a child's healthy development. Where physical education (PE) is part of the primary school curriculum, a strong curriculum-based emphasis on evaluation and support of motor skill development in PE is apparent. Monitoring motor development is then a task for the PE teacher. In order to fulfil this task, teachers need adequate tools. The 4-Skills Scan is a quick and easily manageable gross motor skill instrument; however, its validity has never been asses...

Correlations between resistance training-induced changes on phase angle and biochemical markers in older women.

The main purpose of this study was to investigate the effects of 12 weeks of resistance training (RT) on Phase Angle (PhA), inflammatory and oxidative stress biomarkers, and to evaluate whether these RT-induced adaptations are related to PhA changes. Fifty-one older women (70.6±5.1 years; 26.9±4.2 kg/m ) were randomly allocated into: a training group (TG) that performed 12-week RT or a non-exercising control group (CG). The PhA (Xitron), body composition (DXA), and blood sample measurements (after a 12 h ...

Skeletal maturation, fundamental motor skills and motor performance in preschool children.

Relationships among skeletal age (SA), body size and fundamental motor skills (FMS) and motor performance were considered in 155 boys and 159 girls 3-6 years of age. Stature and body mass were measured. SA of the hand-wrist was assessed with the Tanner-Whitehouse II 20 bone method. The Test of Gross Motor Development, 2 edition (TGMD-2) and the Preschool Test Battery were used, respectively, to assess FMS and motor performance. Based on hierarchical regression analyses, the standardized residuals of SA on c...

Post-exercise ankle blood pressure and ankle to brachial index after heavy load bicycle exercise.

The American Heart Association (AHA) recommendations for diagnosing peripheral artery disease (PAD) after exercise are a decrease > 20% of ankle brachial index (ABI) or > 30 mmHg of ankle systolic blood pressure (ASBP) from resting values. We evaluated ABI and ASBP values during incremental maximal exercise in physically active and asymptomatic patients.

Non-uniformity in pre-insertional Achilles tendon is not influenced by changing knee angle during isometric contractions.

Achilles tendinopathy remains a prevalent condition among recreational and high-level athletes. Mechanical loading has become the gold standard in managing these injuries, but exercises are often generic and prescribed in a "one-size-fits-all" principle. The aim of this study was to evaluate the impact of knee angle changes and different levels of force production on the non-uniform behaviour in the Achilles tendon during isometric contractions. It was hypothesized that a flexed knee position would lead to ...

Kinetic Risk Factors of Running-Related Injuries in Female Recreational Runners.

Our objective was to prospectively investigate the association of kinetic variables with running-related injury (RRI) risk. Seventy-four healthy female recreational runners ran on an instrumented treadmill while 3D kinetic and kinematic data were collected. Kinetic outcomes were vertical impact transient, average vertical loading rate, instantaneous vertical loading rate, active peak, vertical impulse, and peak braking force (PBF). Participants followed a 15-week half-marathon training program. Exposure tim...

A novel method to guide classification of para swimmers with limb deficiency.

The International Paralympic Committee has directed International Federations that govern Para sports to develop evidence-based classification systems. This study defined the impact of limb deficiency impairment on 100 m freestyle performance to guide an evidence-based classification system in Para Swimming, which will be implemented following the 2020 Tokyo Paralympic games. Impairment data and competitive race performances of 90 international swimmers with limb deficiency were collected. Ensemble partial ...

Effect of high-intensity resistance circuit-based training in hypoxia on aerobic performance and repeat sprint ability.

Recent acute studies have shown that high-intensity resistance circuit-based (HRC) training in hypoxia increases metabolic stress. However, no intervention studies have yet proven their effectiveness. This study aimed to analyse the effect of 8 weeks of HRC in hypoxia on aerobic performance, resting energy expenditure (REE), repeat sprint ability (RSA) and haematological variables. Twenty-eight subjects were assigned to hypoxia (FiO =15%; HRC : n=15; age: 24.6±6.8 years; height: 177.4±5.9 cm; weight: 74.9...

No association between rate of torque development and onset of muscle activity with increased risk of hamstring injury in elite football.

Hamstring injuries remain a significant burden in sports that involve high speed running. In elite male football, hamstring injury has repeatedly been identified as the most common noncontact injury, representing 12% of all injuries. As the incidence remains high, investigations are aimed at better understanding how to improve prevention efforts. Intrinsic risk factors such as strength have been investigated extensively in a cohort of professional football players; however, other intrinsic measures of neuro...


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