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International Journal of Sports Medicine

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https://www.readbyqxmd.com/read/28068681/hypoxia-and-hyperoxia-affect-serum-angiogenic-regulators-in-t2dm-men-during-cycling
#1
C Brinkmann, A Metten, P Scriba, C V M Tagarakis, P Wahl, J Latsch, K Brixius, W Bloch
Exercise-induced transient increases in pro-angiogenic regulators can promote angiogenesis.This pilot study aims to analyze the potential of exercise to positively affect angiogenic regulators in patients with type 2 diabetes mellitus (T2DM), who often exhibit abnormal angiogenesis, under different environmental conditions. 9 overweight/obese men with uncomplicated T2DM (8 took anti-diabetic drugs) performed submaximal cycling for 40 min in normoxia (≈21 vol%O2), hypoxia (≈14 vol%O2) and during alternating hypoxia/hyperoxia (≈14 vol%O2/≈30 vol%O2, 5-min intervals) (3×3 crossover design)...
January 9, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28006829/influences-of-interelectrode-distance-and-innervation-zone-on-electromyographic-signals
#2
C M Smith, T J Housh, J M Zuniga, C L Camic, H C Bergstrom, D B Smith, T Herda, J P Weir, E C Hill, N D M Jenkins, R J Schmidt, G Johnson
The purpose of the present study was to examine the effects of electrode placements centered over and offset from the innervation zone (IZ) with different interelectrode distances (IED) on the time and frequency domain parameters of the electromyographic (EMG) signal during a fatiguing submaximal, isometric workout. 11 adults performed an isometric leg extension muscle action at 50% maximal voluntary isometric contraction (MVIC) to exhaustion. Electromyographic amplitude and frequency parameters were determined from electrode placements with different IED centered over, at proximal offset, at distal offset, and away from the IZ at 10, 50, and 100% of the time to exhaustion using an electrode array...
December 22, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27984844/beneficial-effects-of-cooling-during-constant-power-non-steady-state-cycling
#3
E P Homestead, B J Ryan, J A Goodrich, W C Byrnes
This study compared the effects of cooling on the energetic and associated physiological and perceptual responses to constant power, non-steady state cycling. Twelve males cycled at their lactate threshold power for 60 min or until exhaustion under 3 conditions: wearing a cooling vest and sleeves (COOL), a synthetic shirt embedded with an active particle technology claimed to facilitate evaporative heat loss (EVAP), and a standard synthetic shirt (CON). When adjusted for time, the increase in gastrointestinal temperature from baseline was reduced during COOL and EVAP compared to CON (1...
December 16, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27984843/acute-and-long-term-responses-to-different-rest-intervals-in-low-load-resistance-training
#4
J E Fink, B J Schoenfeld, N Kikuchi, K Nakazato
We investigated the effects of low-load resistance training to failure performed with different rest intervals on acute hormonal responses and long-term muscle and strength gains. In the acute study, 14 participants were assigned to either a short rest (S, 30 s) or long rest (L, 150 s) protocol at 40% one-repetition maximum. Blood samples were taken before and after the workout. Both groups showed significant (p<0.05) increases in growth hormone and insulin-like growth factor 1 immediately post-workout...
December 16, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27984842/asymmetry-of-inter-joint-coordination-during-single-leg-jump-after-anterior-cruciate-ligament-reconstruction
#5
Y Blache, B Pairot de Fontenay, S Argaud, K Monteil
Little is known about the contralateral asymmetry in inter-joint coordination after anterior cruciate ligament reconstruction (ACL-R) during multi-segmental movements. This study aimed to evaluate inter-joint coordination asymmetry between the injured (IL) and non-injured leg (NIL) in patients after ACL-R during single-leg jumping. 12 male patients having undergone ACL-R (7.3 months post-surgery) and 12 healthy males performed maximal vertical single-leg jumps with the right and left leg. The kinematics of each jump were recorded...
December 16, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27931053/hemodynamic-responses-to-blood-flow-restriction-and-resistance-exercise-to-muscular-failure
#6
C A Libardi, A M Catai, M Miquelini, A Borghi-Silva, V Minatel, I F Alvarez, J C Milan-Mattos, H Roschel, V Tricoli, C Ugrinowitsch
The aim of the present study was to compare hemodynamic responses between blood flow-restricted resistance exercise (BFR-RE), high-intensity resistance exercise (HI-RE) and low-intensity resistance exercise (LI-RE) performed to muscular failure. 12 men (age: 20±3 years; body mass: 73.5±9 kg; height: 174±6 cm) performed 4 sets of leg press exercises using BFR-RE (30% of 1-RM), HI-RE (80% of 1-RM) and LI-RE (30% of 1-RM) protocols. Systolic (SBP) and diastolic blood pressure (DBP), heart rate (HR), stroke volume (SV), cardiac output (CO) and total peripheral vascular resistance (TPR) were measured on a beat-to-beat continuous basis by a noninvasive photoplethysmographic arterial pressure device...
December 8, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27931052/a-6-week-sprint-interval-training-program-changes-anaerobic-power-quadriceps-moment-and-subcutaneous-tissue-thickness
#7
S Han, H Lee, H Kim, D Kim, C Choi, J Park
We examined the effects of a 6-week 40-m one-way sprint interval training program (based on sprint time). 13 untrained healthy male collegiate students performed six 40-m sprints with a 60-s resting interval between sprints during the first week, and one sprint was added each week until the sixth week. If the 40-m sprint time exceeded 110% of the fastest baseline 40-m sprint time, the run was repeated. Repeated-sprint cycling test (every 3 weeks), quadriceps moment (every 2 weeks), and abdominal and thigh subcutaneous tissue thickness (every 2 weeks) were measured...
December 8, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27931051/validity-of-a-jump-mat-for-assessing-countermovement-jump-performance-in-elite-rugby-players
#8
N Dobbin, R Hunwicks, J Highton, C Twist
This study determined the validity of the Just Jump System(®) (JJS) for measuring flight time, jump height and peak power output (PPO) in elite rugby league players. 37 elite rugby league players performed 6 countermovement jumps (CMJ; 3 with and 3 without arms) on a jump mat and force platform. A sub-sample (n=28) was used to cross-validate the equations for flight time, jump height and PPO. The JJS systematically overestimated flight time and jump height compared to the force platform (P<0.05), but demonstrated strong associations for flight time (with R(2)=0...
December 8, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28073123/effects-of-precooling-on-30-km-cycling-performance-and-pacing-in-hot-and-temperate-environments
#9
André Maia-Lima, Guilherme Passos Ramos, Michele Macedo Moraes, Diogo Antônio Soares Pacheco, Gustavo Guimarães Aguiar de Oliveira, Cristiano Lino Monteiro de Barros, Luciano Sales Prado, Emerson Silami Garcia
This study examined the effects of precooling on performance and pacing during 30-km cycling exercise in hot and temperate environments. 8 trained male cyclists performed 4 trials involving either cooling (PRECTEMP and PRECHOT) or no-cooling interventions (TEMP and HOT) prior to a 30-km self-paced cycling exercise in either a hot (35°C, 68% relative humidity) or temperate environment (24°C, 68% relative humidity). Exercise time was longer in HOT (60.62±3.47 min) than in TEMP (58.28±3.30 min; P<0...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28073122/central-%C3%AE-opioidergic-system-activation-evoked-by-heavy-and-severe-intensity-cycling-exercise-in-humans-a-pilot-study-using-positron-emission-tomography-with-11c-carfentanil
#10
Mikio Hiura, Muneyuki Sakata, Kenji Ishii, Jun Toyohara, Keiichi Oda, Tadashi Nariai, Kiichi Ishiwata
The central opioid receptor system likely contributes to the mechanism underlying the changes in affect elicited by exercise. Our aim was to use positron emission tomography (PET) to test whether exercise intensity influences activation of the μ-opioid receptor system in the brain, and whether changes in opioid receptor activation correlate with exercise-induced changes in affect. 7 healthy young male subjects (23±2 years) performed 20-min constant-load cycling exercises at heavy (ExH) and severe-intensity (ExS), and PET was performed using [(11)C]carfentanil as a tracer before and after each exercise...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27813047/effects-of-acute-aerobic-exercise-on-arterial-stiffness-before-and-after-glucose-ingestion
#11
R Kobayashi, S Yoshida, T Okamoto
The purpose of present study was to compare the acute effects of moderate-intensity aerobic exercise (65% peak oxygen uptake, 30 min) on arterial stiffness before and after glucose ingestion. 11 healthy young males completed 4 trials in random order. They started aerobic exercise at 90 min before (-90 min-EX), 60 min before (-60 min-EX), 30 min after (30 min-EX), and 60 min after (60 min-EX) the 75-g oral glucose tolerance test (OGTT). Aortic (carotid-femoral) and leg (femoral-ankle) pulse wave velocity (PWV), brachial and ankle blood pressure (BP), blood glucose (BG) and insulin levels were measured at 90 min (baseline) and 30 min before and at 30, 60 and 120 min after the 75-g OGTT...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27813046/the-association-between-mct1-t1470a-polymorphism-and-power-oriented-athletic-performance
#12
N Kikuchi, N Fuku, R Matsumoto, S Matsumoto, H Murakami, M Miyachi, K Nakazato
The purpose of this study was to investigate the effects of the MCT1 T1470A polymorphism (rs1049434) on power-oriented performance and lactate concentration during or after cycling sprints in Japanese wrestlers. Participants (199 wrestlers and 649 controls) were genotyped for the MCT1 T1470A genotype (rs1049434) using the TaqMan(®) Assay. All wrestlers were international (n=77) or national (n=122) level athletes. Among them, 46 wrestlers performed 2 anaerobic performance tests, a 30-s Wingate Anaerobic test (WAnT) and a series of 10 maximal effort 10-s sprints on a cycle ergometer...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27793064/hypertrophy-type-resistance-training-improves-phase-angle-in-young-adult-men-and-women
#13
A S Ribeiro, A Avelar, L Dos Santos, A M Silva, L A Gobbo, B J Schoenfeld, L B Sardinha, E S Cyrino
The main purpose of the present study was to investigate the effect of a hypertrophy-type resistance training protocol on phase angle, an indicator of cellular integrity, in young adult men and women. 28 men (22.2±4.3 years, 67.8±9.0 kg and 174.2±6.8 cm) and 31 women (23.2±4.1 years, 58.7±12.1 kg and 162.7±6.4 cm) underwent a progressive RT for 16 weeks (2 phases, 8 weeks each), 3 times per week, consisting of 10 to 12 whole body exercises with 3 sets of 8-12 repetitions maximum. Phase angle, resistance, reactance and total body water (intra and extracellular water compartments) were assessed by bioimpedance spectroscopy (Xitron 4200 Bioimpedance Spectrum Analyzer)...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27793063/electrostimulation-training-effects-on-diurnal-fluctuations-of-neuromuscular-performance
#14
H Gueldich, N Zarrouk, H Chtourou, F Zghal, S Sahli, H Rebai
This study examined the effects of electrostimulation (ES) strength training at the same time-of-day on the diurnal fluctuations of maximal voluntary isometric contractions (MVIC) and surface electromyography (EMG). 20 male performed 3 MVICs of knee extension coupled with surface EMG before and after 5 weeks of 3 ES training sessions per week. Each ES training session consisted in 45 isometric contractions. The participants were randomly assigned to either a morning (MTG, 07:00-08:00 h) or an evening (ETG, 17:00-18:00 h) training group...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27793062/variation-in-responses-to-sprint-training-in-male-youth-athletes-a-meta-analysis
#15
J Moran, G Sandercock, M C Rumpf, D A Parry
The trainability of youths and the existence of periods of accelerated adaptation to training have become key subjects of debate in exercise science. The purpose of this meta-analysis was to characterise youth athletes' adaptability to sprint training across PRE-, MID-, and POST-peak height velocity (PHV) groups. Effect sizes were calculated as a measure of straight-line sprinting performance with studies qualifying based on the following criteria: (a) healthy male athletes who were engaged in organised sports; (b) groups of participants with a mean age between 10 and 18 years; (c) sprint training intervention duration between 4 and 16 weeks...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27793060/rhinitis-in-elite-and-non-elite-field-hockey-players
#16
A Walker, P Surda, M Rossiter, S Little
Rhinitis has been demonstrated to impose a significant disease burden upon the general population. We sought to determine the prevalence of rhinitis in athletes; to investigate its relationship with co-existing allergic symptoms; and to quantify the impact of rhinitis on quality of life in the athlete.3 subgroups were studied: elite field hockey players (FHP); non-elite FHP; and a sedentary control group.Participants were asked to complete a rhinitis self-report questionnaire; the "Allergic Questionnaire for Athletes" (AQUA), and quality of life Sinonasal Outcome Test - 22 (SNOT-22)...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27737489/health-promoting-effects-of-serial-vs-integrated-combined-strength-and-aerobic-training
#17
K Karatrantou, V Gerodimos, K Häkkinen, A Zafeiridis
Combined strength and aerobic training programs are widely used for improving markers of physical fitness and health. We compared the efficiency of a serial and an integrated combined training program on health and overall fitness in middle-aged females. 54 females (46.7±4.5yrs) were assigned to a serial (SCG) or an integrated (ICG) combined training group or to a control group (CG). The SCG and ICG performed a 3-month training combining aerobic dance and calisthenics. The 2 training programs differ in the sequence of aerobic and strength exercises...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27737487/effects-of-pericardiectomy-on-training-and-myocardial-infarction-induced-left-ventricular-hypertrophy-chamber-dimensions-and-gene-expression
#18
A M Wolff, T P Rasmussen, C R Wichern, M R Peterson, M M Stayton, D P Thomas
The primary purpose of the study was to evaluate whether a pericardiectomy (PERI) alters training- or myocardial infarction (MI)-induced left ventricular hypertrophy (LVH), chamber geometry, gene expression and/or running performance. Mice were randomized into 6 groups: naïve control (CONT)-sedentary (Sed), CONT-trained (Tr), PERI-Sed, PERI-Tr, MI-Sed and MI-Tr. MI mice also received a pericardiectomy as part of the MI surgical procedure. 10 weeks of treadmill running resulted in enhanced running performance-to-exhaustion in all 3 trained groups (CONT-Tr, PERI-Tr, MI-Tr) compared to sedentary cohorts (P<0...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27737484/usefulness-of-video-review-of-possible-concussions-in-national-youth-rugby-league
#19
A J Gardner, R M N Kohler, C R Levi, G L Iverson
A new concussion interchange rule (CIR) was introduced in 2014 for the National Rugby League and National Youth Competition (NYC). The CIR allows a player suspected of having sustained a concussion to be removed from play and assessed without an interchange being tallied against the player's team. Participants included all NYC players who used the CIR during the 2014 season. 2 raters completed video analysis of 131 (of a total of 156 reported) uses of the CIR, describing injury characteristics, situational factors, and concussion signs...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28008582/breaking-up-prolonged-sitting-does-not-alter-postprandial-glycemia-in-young-normal-weight-men-and-women
#20
R K Hansen, J B Andersen, A S Vinther, U Pielmeier, R G Larsen
No abstract text is available yet for this article.
December 2016: International Journal of Sports Medicine
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