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International Journal of Sports Medicine

Stine Dahl Vest, Jacob Frandsen, Steen Larsen, Flemming Dela, Jørn Wulff Helge
The aim of the present study was to investigate if peak fat oxidation rate (PFO) is related to Ironman performance in female athletes. Thirty-six female Ironman athletes (age: 34±1 yrs, [21-45 yrs.] SEM [Range]) with a BMI of 22.1±2.0 kg/m2 [18.8-28.4 kg/m2 ], a body fat percentage of 24.8±1.0% [9.0-37.0%] and a V̇O2 peak of 53.0±1.3 ml/min/kg [36.5-70.5 ml/min/kg] were tested in the laboratory prior to the Ironman Copenhagen 2017. Race time ranged from 9:17:07 to 15:23:48 with mean race time being 11:57:26 h:min:s (717 min)...
September 18, 2018: International Journal of Sports Medicine
Hajime Miura, Miduki Ishikawa, Kenichi Deguchi
Endurance exercises, such as cycling or running, are useful for improving arterial function. However, people suffering from partial paralysis or arthritis are unable to perform these kinds of lower-limb exercises. In the present study, we explored the acute effect of upper-arm exercise on arterial stiffness in healthy men. Fourteen healthy adult men performed two experimental trials. The order of experiments was randomized between a 30-min arm-cranking exercise at 50% V̇O2max (A-trial) and a 30-min leg-cycling exercise at 50% V̇O2max (C-trial)...
September 18, 2018: International Journal of Sports Medicine
Yumeng Li, Jupil Ko, Marika Walker, Cathleen Brown, Julianne Schmidt, Seock-Ho Kim, Kathy Simpson
The primary purpose of the study was to determine whether atypical knee biomechanics are exhibited during landing on an inverted surface. A seven-camera motion analysis system and two force plates were used to collect lower extremity biomechanics from two groups of female participants: 21 subjects with chronic ankle instability (CAI) and 21 with pair-matched controls. Subjects performed ten landings onto inverted and flat platforms on the CAI/matched and non-test limbs, respectively. Knee and ankle joint angles, joint angular displacements, joint moments and eccentric work were calculated during the landing phase and/or at the initial contact...
September 18, 2018: International Journal of Sports Medicine
Sang Seok Yeo, Jung Won Kwon
Wheelchair skills training can improve independent wheeled mobility for daily living activities as well as functional and social participation of adults with cervical spinal cord injury (C-SCI). The objective of this study was to examine the effectiveness of wheelchair skills training in improving both wheelchair skills and upper arm skilled performance in adults with C-SCI. In a randomized controlled study, 24 adults with tetraplegia were randomized and allocated to training group (n=13) or control group (n=11)...
September 11, 2018: International Journal of Sports Medicine
Ethan C Hill, Terry J Housh, Cory M Smith, Joshua L Keller, Richard J Schmidt, Glen O Johnson
The primary purpose of the present investigation was to examine sex-related differences as a result of fatiguing eccentric muscle actions on torque, muscle blood flow, electromyography, and mechanomyography. Eighteen men and 18 women performed peak torque trials prior to (pretest), immediately after (posttest), and 5-min after (recovery) completing 50 submaximal (60% of eccentric peak torque), eccentric, isokinetic (180°·s -1 ) muscle actions of the elbow flexors. Electromyographic and mechanomyographic responses were simultaneously recorded from the biceps brachii muscle, and muscle blood flow was measured at pretest, posttest and recovery...
September 11, 2018: International Journal of Sports Medicine
Gretchen D Oliver, Gabrielle G Gilmer, Adam W Anz, Kenzie B Friesen, Abigail R Brittain, Michael D Goodlett, Jeffrey R Dugas, James R Andrews
The purpose of this study was to evaluate pitching mechanics between female softball pitchers with upper extremity pain and those without upper extremity pain. Specifically, the trunk, shoulder and elbow kinematics and shoulder kinetics during the change-up softball pitch were examined. Fifty-five collegiate softball pitchers participated, divided into those with upper extremity pain (20.0±1.3 yrs.; 174.4±6.9 cm; 82.9±12.4 kg; 11.1±2.6 yrs. of experience; n=23) and those who were pain-free (19.9±1...
September 11, 2018: International Journal of Sports Medicine
Riccardo Bravi, Erez James Cohen, Alessio Martinelli, Anna Gottard, Diego Minciacchi
We investigated whether a relationship exists between the inherent timing skill of subject and the magnitude of effect of KT on timing performance by expanding the examination of the dataset described in our previous work. Healthy subjects, tested with and without KT (NKT), performed sets of repetitive wrist's flexion-extensions (IWFEs) with the dominant limb (DL) and the non-dominant limb (NDL) in a synchronization-continuation task at two inter-onset intervals (IOIs): 550-ms and 800-ms. Standard deviation (SD) of IWFEs was used to measure the unevenness of performance...
September 11, 2018: International Journal of Sports Medicine
Stephanie S Lapierre, Brett D Baker, Hirofumi Tanaka
Age-related decreases in performance are thought to be driven by decreases in exercise training stimuli. We determined the influence of changes in training stimuli with advancing age on swimming performance using cross-sectional and longitudinal data analyses. Totals of 692 and 98 competitive swimmers belonging to the US Masters Swimming Association were analyzed in cross-sectional and longitudinal analyses. Swimming times increased with advancing age, and age was the strongest predictor of swimming performance, followed by training volume, in both the cross-sectional and longitudinal analyses...
August 21, 2018: International Journal of Sports Medicine
Hugo A Kerhervé, Benjamin Chatel, Sébastien Reboah, Jérémy Rossi, Pierre Samozino, Laurent A Messonnier
This study aimed to compare the effect of a 40-min submaximal rowing exercise performed on ergometers with fixed and free-floating designs. Heart rate, blood lactate concentration, force and rate of force development (RFD) at the handle, stroke rate, duty factor, movement kinematics of upper and lower limbs, and muscle activity of lumbar spine muscles iliocostalis and erector spinae (IC and ESL) were measured at the beginning and at the end of a 40-min rowing exercise at ~60% of peak power output, in eleven competitive rowers...
August 21, 2018: International Journal of Sports Medicine
Claudia Hacke, David Nunan, Burkhard Weisser
Non-pharmacological treatment, including exercise, is an important therapy option for patients with hypertension. The study assessed the reporting quality of exercise-based interventions included in the latest meta-analysis on that topic in order to evaluate the transferability of findings into clinical practice. Reporting quality of 24 randomised controlled trials from a meta-analysis assessing blood pressure lowering effects of endurance training in 1,195 hypertensive patients was evaluated using TIDieR (Template for Intervention Description and Replication) and CERT (Consensus on Exercise Reporting Template) guidelines...
August 21, 2018: International Journal of Sports Medicine
Jonggun Kim, JongEun Yim
This study aimed to examine the effects of a rehabilitation exercise combined with instrument-assisted soft tissue mobilization on the isokinetic power, muscle fatigue, and fitness of soccer players. An interventional study design was used to assess 40 subjects aged 15-17 years. Twenty participants each in instrument-assisted soft tissue mobilization and control groups completed several tests to determine player development. The results showed significant differences between the two groups with respect to the isokinetic power of the ankle (i...
August 21, 2018: International Journal of Sports Medicine
Patrick Fuerst, Albert Gollhofer, Heinz Lohrer, Dominic Gehring
Despite a considerable amount of research, the deficits causing recurrent sprains in people with chronic ankle instability are still unclear. Changes in frontal plane kinematics and decreased peroneal activation have been proposed as potential underlying mechanisms, but whether people with ankle instability show deficits in control of injury-relevant movements is not well understood. Therefore, the purpose of the present study was to analyse ankle joint kinematics and kinetics as well as neuromuscular activation during dynamic change-of-direction movements...
August 17, 2018: International Journal of Sports Medicine
Emmanuelle Rochette, Etienne Merlin, Christophe Hourdé, Bertrand Evrard, Bruno Peraira, Stephane Echaubard, Pascale Duché
The aim of this study was to measure the impact, at 24 h post-exercise, of a single exercise bout on plasma inflammatory markers such as calprotectin, IL-6, sIL-6 R, sgp130 and the hypothalamic-pituitary-adrenal (HPA) axis in children with juvenile idiopathic arthritis (JIA).Twelve children with JIA attended the laboratory on three consecutive days (control day, exercise day and 24 h post-exercise), including a 20-min exercise bout on a cycle-ergometer at 70% of max. HR at 8:30 a.m. on day 2. Plasma concentrations of calprotectin, IL-6, sIL-6 R, sgp130, cortisol, ACTH and DHEA were measured on venous blood samples taken every day...
August 17, 2018: International Journal of Sports Medicine
Ko Yanase, Satoshi Hasegawa, Masatoshi Nakamura, Taishi Yamauchi, Satoru Nishishita, Kojiro Araki, Jun Umehara, Kosuke Fujita, Ikuya Sato, Satoko Ibuki, Noriaki Ichihashi
The purpose of this study was to determine the effects of six weeks of electrical muscle stimulation (EMS) on the strength and muscle mass of the infraspinatus muscle. Twenty non-athletes (age: 24±3.4 years, height: 171.5±5.6 cm, mass: 65.2±8.1 kg) were randomly classified into two groups, an electrical muscle stimulation group (EMS group) and a control group (CON group). The EMS group completed a total of 18 20- min EMS sessions, three times per week over a period of six weeks, while the CON group received no intervention...
August 16, 2018: International Journal of Sports Medicine
Kerry J MacDonald, Luz Maria Palacios-Derflingher, Carolyn A Emery, Willem H Meeuwisse
A time-loss injury definition continues to be the most widely used injury definition despite evidence that it fails to accurately capture overuse injuries. An overuse injury questionnaire, using an "all complaints" definition has been created to address the limitation of a time-loss definition. The main aim of this work was to determine the effect that injury definition and registration methodology has on the collection of knee injuries among elite level volleyball players. To reach this goal, seventy-two volleyball players were prospectively followed over 32-weeks...
August 13, 2018: International Journal of Sports Medicine
Ana Cristina Corrêa Figueira, Mafalda Corrêa Figueira, Carina Silva, Ana Padrão, Paula Alexandra Oliveira, Rita Pinho Ferreira, Jose Alberto Duarte
Despite the importance attributed to exercise training in the breast cancer (BC) continuum, the underlying mechanisms modulating tumor behavior are unknown. We evaluated the effects of long-term moderate-exercise in the development of mammary tumors, and studied the microenvironment of infiltrative lesions, the amount of connective tissue, and balance between cellular proliferation/death.Fifty Sprague-Dawley rats, randomly assigned into four groups: two control groups (sedentary and exercised) and two models of BC groups (sedentary and exercised) induced by N-methyl-N-nitrosoureia (MNU), were sacrificed after 35 weeks of moderate-exercise, and all perceptible tumors were removed for histological and immunohistochemistry analysis...
August 10, 2018: International Journal of Sports Medicine
Pantelis Theodoros Nikolaidis, Elias Villiger, Thomas Rosemann, Beat Knechtle
The aim of the study was to examine the effect of performance group by race time (10 groups;<3 h, 3-4 h, and so on up to>12 h) on pacing in women (n=19,465) and men (n=164,454) finishers in the 'Vasaloppet' cross-country (XC) skiing race from 2004 to 2017. The speed in the fastest and slowest split was analysed as a percentage of the mean race speed and pacing was defined as the difference (%) between the fastest and slowest split. Women had a larger pace range than men (44.0±10.6% versus 41.1±12...
August 10, 2018: International Journal of Sports Medicine
Oscar García-García, Alba Cuba-Dorado, Diego Fernández-Redondo, José López-Chicharro
The aim was to determine the predictive capacity of neuromuscular parameters on physiological predictors of performance related to pedaling power. The sample comprised fifty elite cyclists. On the same day, they were given a neuromuscular evaluation with tensiomyography (TMG) and then performed an effort test on a cycle ergometer until exhaustion. The TMG recorded the maximum radial muscle belly displacement, contraction time, delay time, derivative normalized response speed, and lateral symmetry. Peak power output (Wpeak·kg-1 ), effort time, maximum lactate concentration, power in the first lactate threshold, and power in the second lactate threshold were recorded in the effort test...
August 7, 2018: International Journal of Sports Medicine
Victor Martin, Javier Sanchez-Sanchez, Rodrigo Ramírez-Campillo, Fábio Yuzo Nakamura, Oliver Gonzalo-Skok
The present study aimed to examine the reliability, usefulness, responsiveness, age-related differences and construct validity of a novel decision-making RSA test (RSA-RANDOM test) in young soccer players. Twenty-five young male soccer players performed the RSA-RANDOM test on 2 occasions separated by 5-7 days to assess test-retest reliability and determine a priori usefulness. Furthermore, the same players executed the RSA-RANDOM test 4 times throughout the season to analyse responsiveness. Forty-five players (U-13 to U-17) were evaluated in such test to examine age-related differences...
July 19, 2018: International Journal of Sports Medicine
Luke Donovan, Tyler M Miklovic, Mark A Feger
Currently, there is no clinical exam to evaluate ankle frontal plane kinematics. The purpose of this study was to determine whether individuals identified as "lateral" landing during a video-recorded step-down task have differences in ankle inversion as measured with 3-dimensional motion capture during walking, step-down, and jump-landing tasks compared to individuals identified as "non-lateral". Fifty-seven recreationally active adults completed the descriptive laboratory study. During walking, step-down, and jump-landing tasks, participants had their ankle frontal plane kinematics measured using a 3-dimensional motion capture system...
July 19, 2018: International Journal of Sports Medicine
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