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

16:10 EDT 17th October 2018 | BioPortfolio

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Showing PubMed Articles 1–25 of 234 from Scandinavian journal of medicine & science in sports

Neuroplastic Changes in ACLR Patients from Neuromechanical Decoupling.

The purpose of this study was to identify how the brain simultaneously perceives proprioceptive input during joint loading in anterior cruciate ligament reconstruction (ACLR) patients, when compared to healthy controls. Seventeen ACLR patients (ACLR) and seventeen controls (CONT) were tested for the somatosensory cortical activation using electroencephalography (EEG) while measuring knee laxity using a knee arthrometer. The relationship between cortical activation and joint laxity within group was also exam...

Dynamic stretching is not detrimental to neuromechanical and sensorimotor performance of ankle plantarflexors.

The acute effects of two dynamic stretching (DS) protocols on changes in the ankle range of motion (RoM), neuromechanical and sensorimotor properties of the plantarflexor muscle group were examined. Eighteen participants received slow (SDS) or fast dynamic stretching (FDS) on two separate days. Outcome measures were assessed pre- and 2 minutes post-interventions, and included maximum dorsiflexion angle, maximum isometric torque at neutral ankle position, maximum concentric and eccentric torques, force match...

Towards a Better Assessment of Perceived Social Influence: The Relative Role of Significant Others on Young Athletes.

The purpose of this three-study paper was to develop and validate the Perceived Social Influence in Sport Scale-2 (PSISS-2) that aimed to resolve the limitations of PSISS-1 in assessing the relative social influence of significant others in youth sport. In Study 1, a pool of 60 items generated from revisiting a qualitative dataset about significant others of young athletes were examined by two expert panel reviews in terms of content validity, clarity, coverage, and age-appropriateness, leading to the devel...

Effects of hydration status during heat acclimation on plasma volume and performance.

The impact of hydration status was investigated during a 5-day heat acclimation (HA) training protocol versus mild/cool control conditions on plasma volume (PV) and performance (20km time-trial (TT)). Sub-elite athletes were allocated to one of two heat training groups (90 min/day): 1) dehydrated to ~2% body weight (BW) loss in heat (35°C; DEH; n=14); 2) euhydrated heat (35°C; EUH; n=10), where training was isothermally clamped to 38.5°C core temperature (Tc). A euhydrated mild control group (22°C; CON;...

Increased vascular function and superoxide dismutase activity in physically active vs. inactive adults living with HIV.

This study compared macro- and microvascular endothelial function and redox status in active vs. inactive HIV-infected patients (HIVP) under antiretroviral therapy. Using a cross-sectional design, macro- and microvascular reactivity, systemic microvascular density, and oxidative stress were compared between 19 HIVP (53.1±6.1 yr) enrolled in a multimodal training program (aerobic, strength and flexibility exercises) for at least 12 months (60-min sessions performed 3 times/week with moderate intensity) vs. ...

The use of an IL1-Receptor Antagonist to Reverse the Changes Associated with Established Tendinopathy in a Rat Model.

Interleukin 1 (IL1) is a cytokine that plays a role in inflammation and is a potential contributor to the inflammation present in tendinopathy. Its inhibition may be of use in the treatment of tendinopathy and has been a target for treatment. To evaluate how an IL1-receptor antagonist (IL1-RA) reverses pathologic changes associated with established patellar tendinopathy we randomized 48 Sprague-Dawley retired-breeder rats into three groups having weekly bilateral patellar tendon injections for six weeks. Th...

Interactions between fascicles and tendinous tissues in gastrocnemius medialis and vastus lateralis during drop landing.

Animal tendons have been shown to act as shock absorbers to protect muscle fascicles from exercise-induced damage during landing tasks. Meanwhile, the contribution of tendinous tissues to damping activities such as landing has been less explored in humans. The aim of this study was to analyze in vivo fascicle-tendon interactions during drop landing to better understand their role in energy dissipation. Ultrafast ultrasound images of the gastrocnemius medialis (GM) and vastus lateralis (VL), lower limb elect...

Comparison of lower limb stiffness between male and female dancers and athletes during drop jump landings.

Repetition of jumps in dance and sport training poses a potential injury risk, however non-contact landing injuries are more common in athletes than dancers. This study aimed to compare the lower limb stiffness characteristics of dancers and athletes during drop landings to investigate possible mechanisms of impact-related injuries. Kinematics and kinetics were recorded as 39 elite modern and ballet dancers (19 men, 20 women) and 40 college level team sport athletes (20 men, 20 women) performed single-legge...

Eccentric cycling is more efficient in reducing fat mass than concentric cycling in adolescents with obesity.

The benefits of eccentric (ECC) training on fat mass (FM) remain underexplored. We hypothesized that in obese adolescents, ECC cycling training is more efficient for decreasing whole-body FM percentage compared to concentric (CON) performed at the same oxygen consumption (VO ). Twenty-four adolescents aged 13.4±1.3 yrs. (BMI >90 percentile) were randomized to ECC or CON. They performed 3 cyclo-ergometer sessions per week (30 min per session) for 12 weeks: 2 habituation, 5 at 50% VO , and 5 at 70% VO . A...

Determinants of maximal whole body fat oxidation in elite cross-country skiers: role of skeletal muscle mitochondria.

Elite endurance athletes possess a high capacity for whole body maximal fat oxidation (MFO). The aim was to investigate the determinants of a high MFO in endurance athletes. The hypotheses were that augmented MFO in endurance athletes is related to concomitantly increments of skeletal muscle mitochondrial volume density (Mito ) and mitochondrial fatty acid oxidation (FAO ), i.e. quantitative mitochondrial adaptations as well as intrinsic FAO per mitochondria, i.e. qualitative adaptations. Eight competitive ...

Can participants predict where ambulance-requiring cases occur at a half marathon?

Despite endurance races leading to a substantial number of ambulance-requiring cases (ARC), little is known regarding where they occur, meaning that knowing where to place medical teams, ambulance pick-up points, etc., is difficult. This article investigates if the location of ARCs can be identified by race participants.

Response to Nunes and colleagues letter: The data does not seem to support the effect of stretch training in increasing MT.

The letter by JP Nunes and colleagues raise concerns over the conclusions and results of the manuscript "Stretch training induces unequal adaptation in muscle fascicles and thickness of the medial and lateral gastrocnemii" published in Scand J Med Sci Sports 27(12):1597-1604, 2017 based on the statistical analysis employed. Nunes et al., are thanked for the careful consideration of our published work, which has given us the opportunity to provide additional data and statistics to address the published conc...

Time to redefine post-exercise pressure decrease and post-exercise ankle-brachial index to diagnose peripheral artery disease.

We read with interest the paper from Godet et al. entitled. "Post-exercise ankle blood pressure and ankle to brachial index (ABI) after heavy load bicycle exercise". In this paper, the authors suggest that the American Heart Association (AHA) criteria after an heavy load test on a cycle ergometer are inadequate for the diagnosis of lower extremity peripheral artery disease (LEPAD) This article is protected by copyright. All rights reserved.

Kinematic and electromyographic analysis of the Askling L-Protocol for hamstring training.

Hamstring injuries are common in field sport athletes. Eccentric strength training of the hamstring muscles is an integral component of rehabilitation programmes. The Askling L-Protocol comprises three exercises [Extender; Diver; Glider] that load the hamstrings during eccentric activity. When compared to a conventional exercise-based rehabilitation programme, the Askling L-Protocol has been shown to reduce the time to return to sport following hamstring injury and prevalence of injury recurrence. Neverthel...

Long-term determinants of changes in television viewing time in adults: Prospective analyses from the Young Finns Study.

The long-term effects of sociodemographic and health characteristics on television viewing (TV) time changes have not been identified in adulthood. We aimed to examine the modifiable and non-modifiable determinants of changes in TV-time in young adults over 10 years.

Patterns of accelerometer-based sedentary behavior and their association with cardiorespiratory fitness in adults.

We aimed to identify patterns of sedentary behavior (SB) and examined whether cardiorespiratory fitness differs between classes with distinct patterns of SB. One hundred seventy participants (57% women, mean age = 56.4 years) received accelerometry monitoring for seven days. Prior to accelerometry assessment, cardiorespiratory fitness was assessed by peak oxygen uptake (VO ). VO was directly measured during a symptom-limited cardiopulmonary exercise testing on a cycle ergometer. Patterns in accelerometer da...

Physiological responses and parasympathetic reactivation in rescue interventions: The effect of the breathing apparatus.

This study aimed to assess the effect of wearing a breathing apparatus during a simulated rescue intervention on psycho-physiological responses and parasympathetic reactivation of firefighters. Thirty-four firefighters participated in this study which consisted of four experimental sessions conducted randomly: a maximal fitness test and three rescue interventions performed 1) with personal protective clothing (PPC); 2) with PPC and the full self-contained breathing apparatus (SCBA), including cylinder, full...

Ankle pressure and ankle brachial index after heavy load incremental exercise.

We thank Stivalet et al. for their letter about our manuscript studying ankle pressure and ankle brachial index (ABI) after incremental heavy load exercise. The detailed description of procedures and populations of the previous studies are of interest and correct but the suggestion that we calmed that the "American Heart Association (AHA) criteria after a heavy load test on a cycle ergometer are inadequate for the diagnosis of lower extremity peripheral artery disease (PAD)" is not exact… Stivalet et al...

King-Devick test normative reference values and internal consistency in youth football and soccer athletes.

The King-Devick (K-D) test has gained popularity as a sideline concussion assessment tool, comprising of visual tracking and saccadic eye movements. However, limited normative data exists for youth athletes under the age of 13. The purpose of this study was to establish normative reference values and examine the internal consistency of the K-D test in youth athletes. The K-D test was administered to 422 youth football and soccer athletes prior to their respective season. The average K-D score was 54.29±11....

The data does not seem to support the effect of stretch training on increasing muscle thickness.

Scand J Med Sci Sports 27(12):1597-1604, 2017 describes the efficacy of stretch training on increasing gastrocnemii muscle thickness. However, the reported data does not seem to support the author's conclusions, based on the presented results. This letter discusses the issues with the paper. This article is protected by copyright. All rights reserved.

Corrigendum.

Metabolic and performance-related consequences of exercising at and slightly above MLSS.

Exercising at the maximal lactate steady state (MLSS) results in increased but stable metabolic responses. We tested the hypothesis that even a slight increase above MLSS (10 W), by altering the metabolic steady-state, would reduce exercise performance capacity. Eleven trained men in our study performed: one ramp-incremental tests; two to four 30-min constant-load cycling exercise trials to determine the PO at MLSS (MLSS ), and ten watts above MLSS (MLSS ), which were immediately followed by a time-to-exhau...

Functional Performance Tests Identify Lateral Ankle Sprain Risk: A Prospective Pilot Study in Adolescent Soccer Players.

Determining the clinical utility of functional performance tests (FPTs) and establishing cutoff scores could be useful in identifying those athletes who could benefit from effective injury prevention interventions. Our purpose was to determine the accuracy of FPTs in identifying adolescent athletes who go on to experience lateral ankle sprain(s) and establish specific cutoff scores capable of identifying those who sustain a lateral ankle sprain in the near future. Sixty-four participants (age = 15.5 ± 1.3y...

Hamstring and other thigh injuries in children and young athletes.

In adults, hamstring injuries may lead to long periods of rehabilitation, and carry a definite risk of recurrence. However, no studies detail how these injuries affect young athletes.

Drug treatments associated with Achilles tendon rupture. A case-control study involving 1118 Achilles tendon ruptures.

The incidence of Achilles tendon (AT) rupture, especially non-sport related rupture, is increasing, while the reasons for this increase are largely unknown. The association between AT rupture and the use of various drug treatments was studied. We collected AT rupture patients from the Finnish Hospital Discharge Register. We also acquired information about all the doctor-prescribed drugs they had purchased within one year before the rupture. For comparison, we randomly selected age- and sex-matched controls ...


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