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International Journal of Sports Medicine

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https://www.readbyqxmd.com/read/28315285/effects-of-plyometric-training-on-physical-fitness-in-prepuberal-soccer-athletes
#1
Yassine Negra, Helmi Chaabene, Senda Sammoud, Raja Bouguezzi, Mohamed Aymen Abbes, Younés Hachana, Urs Granacher
This study aimed at examining the effects of plyometric training on stable (SPT) vs. unstable (UPT) surfaces on physical fitness in prepuberal soccer players. Male athletes were randomly assigned to SPT (n=18; age=12.7±0.2 years) or UPT (n=16; age=12.2±0.5 years). Both groups conducted 3 regular soccer training sessions per week combined with either 2 SPT or UPT sessions. Assessment of jumping ability (countermovement jump [CMJ], and standing long jump [SLJ]), speed (10-m, 20-m, 30-m sprint), agility (Illinois agility test [IAT]), and balance (stable [SSBT], unstable [USBT] stork balance test; stable [SYBT], unstable [UYBT] Y balance test) was conducted pre-and post-training...
March 17, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28315284/the-potential-of-established-fitness-cut-off-points-for-monitoring-women-with-fibromyalgia-the-al-%C3%A3-ndalus-project
#2
José Castro-Piñero, Virginia A Aparicio, Fernando Estévez-López, Inmaculada C Álvarez-Gallardo, Milkana Borges-Cosic, Alberto Soriano-Maldonado, Manuel Delgado-Fernández, Víctor Segura-Jiménez
The aim of the present study was to determinate whether fitness cut-off points discriminate the severity of major fibromyalgia symptoms and health-related quality of life. Additionally, we investigated which American Colleague of Rheumatology (ACR) fibromyalgia criteria (1990 vs. modified 2010) better discriminate fibromyalgia symptomatology. A total of 488 women with fibromyalgia and 200 non-fibromyalgia (control) women participated. All participants underwent both the 1990 and the modified 2010 ACR preliminary criteria (hereinafter 1990c and m-2010c, respectively)...
March 17, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28303562/association-between-actn3-r577x-polymorphism-and-trunk-flexibility-in-2-different-cohorts
#3
Naoki Kikuchi, Hirofumi Zempo, Noriyuki Fuku, Haruka Murakami, Mikako Sakamaki-Sunaga, Takanobu Okamoto, Koichi Nakazato, Motohiko Miyachi
α-Actinin-3 (ACTN3) R577X polymorphism is associated with muscular strength and power. This study was performed to investigate the association between ACTN3 R577X polymorphisms and flexibility as another component of fitness in 2 cohorts. Cohort 1 consisted of 208 men and 568 women (ages 23-88), while Cohort 2 consisted of 529 men and 728 women (ages 23-87). All participants were recruited from the Tokyo metropolitan area and underwent a battery of tests to assess their grip strength and sit-and-reach flexibility...
March 16, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28255967/aerobic-and-anaerobic-swimming-force-evaluation-in-one-single-test-session-for-young-swimmers
#4
Filipe Antônio de Barros Sousa, Natalia Almeida Rodrigues, Leonardo Henrique Dalcheco Messias, Jair Borges Queiroz, Fulvia Barros Manchado-Gobatto, Claudio Alexandre Gobatto
This study aims to propose and validate the tethered swimming lactate minimum test (TSLacmin) estimating aerobic and anaerobic capacity in one single test session, using force as measurement parameter. 6 male and 6 female young swimmers (age=15.7±1.1 years; height=173.3±9.5 cm; weight=66.1±9.5 kg) performed 4 sessions comprising i) an all-out 30 s test and incremental test (TSLacmin); ii) 30 min of tethered swimming at constant intensity (2 sessions); iii) free-swimming time trials used to calculate critical velocity...
March 2, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28255966/effect-of-resistance-exercise-on-arterial-stiffness-during-the-follicular-and-luteal-phases-of-the-menstrual-cycle
#5
Takanobu Okamoto, Ryota Kobayashi, Mikako Sakamaki-Sunaga
Acute high-intensity resistance exercise increases arterial stiffness. Changes in blood concentrations of estrogen and progesterone associated with the menstrual cycle affect the degree of arterial stiffness. Therefore, high-intensity resistance exercise may affect arterial stiffness differently depending on the phase of the menstrual cycle. The purpose of this study was to investigate the effects of different phases of the menstrual cycle on arterial stiffness after one session of resistance exercise. The participants were 9 eumenorrheic females (21...
March 2, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28255965/high-intensity-exercise-in-men-with-type-1-diabetes-and-mode-of-insulin-therapy
#6
Andrzej Gawrecki, Dariusz Naskret, Pawel Niedzwiecki, Anna Duda-Sobczak, Aleksandra Araszkiewicz, Dorota Zozulinska-Ziolkiewicz
The purpose of this study was to evaluate the impact of high intensity exercise on glucose levels and risk of metabolic decompensation in males with type 1 diabetes (T1D), depending on the method of insulin administration. The study comprised 29 males (aged 25.3±5.1 years; duration of diabetes 10.3±3.2 years) treated with continuous subcutaneous insulin infusion (CSII) or multiple daily insulin injections (MDI). Treadmill exercise test was performed twice in each patient until subjective exhaustion as maximum according to the Borg scale...
March 2, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28249346/increased-training-volume-improves-bone-density-and-cortical-area-in-adolescent-football-players
#7
Ian Varley, David C Hughes, Julie P Greeves, William D Fraser, Craig Sale
Habitual football participation has been shown to be osteogenic, although the specific volume of football participation required to cause bone adaptations are not well established. The aim of the present study is to investigate tibial bone adaptations in response to 12 weeks of increased training volume in elite adolescents who are already accustomed to irregular impact training. 99 male adolescent elite footballers participated (age 16±0 y; height 1.76±0.66 m; body mass 70.2±8.3 kg). Tibial scans were performed using peripheral quantitative computed tomography immediately before and 12 weeks after an increase in football training volume...
March 1, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28249345/mechanical-alterations-during-800-m-self-paced-track-running
#8
Olivier Girard, Gregoire P Millet, Jean-Paul Micallef
We assessed the time course of running mechanical alterations during an 800-m. On a 200-m indoor track, 18 physical education students performed an 800-m self-paced run. Once per lap, ground reaction forces were measured by a 5-m-long force platform system, and used to determine running kinetics/kinematics and spring-mass characteristics. Compared with 100 m (19.4±1.8 km.h(-1)) running velocity progressively decreased at 300, 500 m but levelled-off at 700 m marks (-5.7±4.6, -10.4±8.3, and -9.1±13...
March 1, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28249344/psychotropic-drug-use-in-recreational-scuba-divers-and-its-effect-on-severe-narcosis
#9
Thierry Krummel, Alicia Thiery, Marion Villain, Bernard Schittly, Benoit Brouant
Recreational scuba diving is no longer reserved for young healthy individuals, and as a result, medical drug consumption is on the rise in the diving population. Due to the possible potentiation of nitrogen narcosis by psychotropic drugs, the latter are hence discouraged and are subject to contraindications for practice. However, there are no available experimental data to support this theoretical assumption. The objective of this study is to investigate whether psychotropic drug users are more at risk of severe narcosis...
March 1, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28219107/chronic-blood-pressure-reductions-and-increments-in-plasma-nitric-oxide-bioavailability
#10
Crisieli M Tomeleri, Alexandre J Marcori, Alex Silva Ribeiro, Aline Mendes Gerage, Camila de Souza Padilha, Durcelina Schiavoni, Mariana F Souza, Jerry L Mayhew, Matheus Amarante do Nascimento, Danielle Venturini, Decio Sabbatini Barbosa, Edilson Serpeloni Cyrino
This study analyzed the effects of 12 weeks of resistance training (RT) on resting blood pressure (BP) and plasma levels of nitric oxide metabolites (NOx) in pre- and hypertensive older women, and evaluated the relationship between these 2 parameters. Thirty-five older women (68.2±5.7 years, 70.0±14.4 kg, 157.1±6.4 cm, 28.3±5.0 kg.m(-2)) were randomly allocated into a training group (TG; n=17), which performed a 12-week RT program, and a control group (CG; n=18), which did not perform any physical exercise...
February 20, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28219106/reliability-and-validity-of-a-self-paced-cardiopulmonary-exercise-test-in-post-mi-patients
#11
Lauren Ann Jenkins, Alexis Mauger, Jane Fisher, James Hopker
A self-paced peak oxygen uptake (V̇O2peak) test (SPV) has been shown to produce higher V̇O2peak values compared to standard cardiopulmonary exercise tests (sCPET), but has not been tested on any clinical population. This study aimed to assess the reliability of the SPV in a healthy population (study 1), and the validity and reliability of the SPV in post-myocardial infarction (post-MI) patients (study 2). For study 1, 25 healthy participants completed 3 SPV's. For study 2, 28 post-MI patients completed one sCPET and 2 SPV's...
February 20, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28219105/effects-of-resistance-training-volume-on-mmps-in-circulation-muscle-and-adipose-tissue
#12
Ivo Vieira de Sousa Neto, Ramires Alsamir Tibana, Dahan da Cunha Nascimento, Denis César Leite Vieira, Joao Luiz Quagliotti Durigan, Guilherme Borges Pereira, James Wilfred Navalta, Rita de Cássia Marqueti, Jonato Prestes
The aim of this study was to investigate the effects of different resistance training (RT) volumes on MMP activity in skeletal muscle, visceral adipose tissue and circulation. 21 Wistar rats were randomly divided into 3 groups (n=7 per group): sedentary control (SC); RT with 4 ladder climbs (RT-4; 50, 75, 90 and 100% of their maximal carrying capacity) and RT with 8 ladder climbs (RT-8 with 2 sets for each load). The 8-week RT consisted of climbing a 1.1-m vertical ladder with weights secured to the animals' tails...
February 20, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28219104/captopril-does-not-potentiate-post-exercise-hypotension-a-randomized-crossover-study
#13
Andréia Cristiane Carrenho Queiroz, Julio Cesar Silva Sousa, Natan Daniel Silva, Eleonora Tobaldini, Katia Coelho Ortega, Edilamar Menezes de Oliveira, Patricia Chakur Brum, Nicola Montano, Decio Mion, Taís Tinucci, Claudia Lucia de Moraes Forjaz
To evaluate whether captopril (3×50 mg/day) potentiates post-resistance exercise hypotension (PREH) in hypertensives (HT), 12 HT men received captopril and placebo for 4 weeks each in a double-blinded, randomized-crossover design. On each therapy, subjects underwent 2 sessions: Control (C - rest) and Resistance Exercise (RE - 7 exercises, 3 sets to moderate fatigue, 50% of 1 RM -repetition maximum). Measurements were taken before and after 30-60 min (Post1) and 7 h (Post2), and ambulatory blood pressure (BP) was monitored for 24 h...
February 20, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28219103/digoxin-induces-cardiac-hypertrophy-without-negative-effects-on-cardiac-function-and-physical-performance-in-trained-normotensive-rats
#14
Claodete Hasselstrom Neves, Ramires Alsamir Tibana, Jonato Prestes, Fabricio Azevedo Voltarelli, Andreo Fernando Aguiar, Gustavo Augusto Ferreira Mota, Sergio Luiz Borges de Sousa, Andre Soares Leopoldo, Ana Paula Lima Leopoldo, Andre Mueller, Danilo Henrique Aguiar, James Wilfred Navalta, Mario Mateus Sugizaki
Cardiotonic drugs and exercise training promote cardiac inotropic effects, which may affect training-induced cardiac adaptations. This study investigated the effects of long-term administration of digoxin on heart structure and function, and physical performance of rats submitted to high-intensity interval training (HIIT). Male Wistar rats, 60 days old, were divided into control (C), digoxin (DIGO), trained (T), and trained with digoxin (TDIGO). Digoxin was administered by gavage (30 µg/kg/day) for 75 days...
February 20, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28192831/training-effects-of-the-fifa-11-and-harmoknee-on-several-neuromuscular-parameters-of-physical-performance-measures
#15
Francisco Ayala, Carlos Pomares-Noguera, Francisco Javier Robles-Palazón, Maria Del Pilar García-Vaquero, Ignacio Ruiz-Pérez, Sergio Hernández-Sánchez, Mark De Ste Croix
The main purpose of this study was to analyse the training effects of the FIFA 11+ and Harmoknee on several parameters of physical performance measures in youth amateur football players. 41 adolescent players were randomised within each team into 2 groups (team 1: control vs. FIFA 11+; team 2: control vs. Harmoknee). The FIFA 11+ and Harmoknee groups performed the program 3 times a week for 4 weeks; the control groups completed their usual warm-up routines. 13 physical performance measures (joint range of motion, dynamic postural control, single legged hop limb symmetry, sprint time, jumping height and agility) were assessed...
February 13, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28282663/reliability-and-validity-of-a-new-specific-field-test-of-aerobic-capacity-with-the-ball-for-futsal-players
#16
Ricardo Barbieri, Fabio Barbieri, Fabio Milioni, Julio Dos-Santos, Marcelo Soares, Alessandro Zagatto, Marcelo Papoti
The aim of this study was to establish the validity and reliability and verification of the reproducibility of the lactate minimum test (LM) to predict the maximal lactate steady state exercise intensity (MLSS) on a futsal-specific circuit (Futsal_circuit) which takes into consideration the technical movements performed. 16 male Brazilian futsal players (body mass: 67.7±8.3 kg; height: 1.73±0.05 m) were distributed randomly into 2 studies with 8 athletes in each (Study A - reproducibility; Study B - validity)...
March 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28219108/relative-age-maturation-and-physical-biases-on-position-allocation-in-elite-youth-soccer
#17
Chris Towlson, Stephen Cobley, Adrian Wayne Midgley, Andrew Garrett, Guy Parkin, Ric Lovell
This study assessed the contribution of relative age, anthropometry, maturation, and physical fitness characteristics on soccer playing position (goalkeeper [GK], central-defender [CD], lateral-defender [LD], central-midfield [CM], lateral-midfielder [LM], and forward [FWD]) for 465 elite-youth players (U13-U18's). U13-14 CD were relatively older than LD and CM (likely small effects). CD and GK were generally taller and heavier (likely small to very-likely moderate effects) than other players at each developmental stage and were advanced maturers at U13-14 (very-likely small to likely moderate effects)...
March 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28219102/no-evidence-of-racial-differences-in-endothelial-function-and-exercise-blood-flow-in-young-healthy-males-following-acute-antioxidant-supplementation
#18
Rebecca M Kappus, Kanokwan Bunsawat, Alexander J Rosenberg, Bo Fernhall
This study investigated the effects of acute antioxidant supplementation on endothelial function, exercise blood flow and oxidative stress biomarkers in 9 young African American compared to 10 Caucasian males (25.7±1.2 years). We hypothesized that African American males would have lower exercise blood flow and endothelial responsiveness compared to Caucasian males, and these responses would be improved following antioxidant supplementation. Ultrasonography was used to measure blood flow during handgrip exercise...
March 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28212587/prevalence-of-urinary-incontinence-in-females-performing-high-impact-exercises
#19
Magdaléna Hagovska, Ján Švihra, Alena Buková, Agáta Hrobacz, Dana Dračková, Viera Švihrová, Lenka Kraus
The aim of this cross-sectional study was to monitor the prevalence of symptoms of stress (SUI) and mixed urinary incontinence (MUI) in sportswomen performing high-impact exercises. A further objective was to compare the symptoms of urinary incontinence (UI) and quality of life in sportswomen. We used the International Consultation on Incontinence Questionnaire (ICIQ-SF), the Overactive Bladder Questionnaire (OAB-q), the Urinary Incontinence Quality of Life Scale (I-QOL) and the International Physical Activity Questionnaire (IPAQ), short version...
March 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28212586/effects-of-resistance-band-exercise-on-vascular-activity-and-fitness-in-older-adults
#20
Mark F Smith, Mistrelle Ellmore, Geoff Middleton, Paul M Murgatroyd, Thomas I Gee
This study investigated the effects of a low to moderately intense resistance-band exercise intervention on cutaneous microvascular function in an older population. 18 sedentary healthy participants (age: 58±5) were assessed for their upper and lower-limb endothelial cutaneous vascular conductance using laser Doppler fluximetry with endothelial-dependent (80 μl acetylcholine chloride), and -independent vasodilation (80 μl sodium nitroprusside). In addition, participants underwent a range of functional assessments (cardiopulmonary fitness, strength, flexibility), and completed a perceived quality of life questionnaire...
March 2017: International Journal of Sports Medicine
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