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Beata Pożarowszczyk, Artur Gołaś, Aiguo Chen, Adam Zając, Adam Kawczyński
The purpose of this study is to examine and further understand the effects of post activation potentiation on Achilles tendon (AT) thickness, elasticity and stiffness among basketball players. Basketball is one of the world's most popular and widely viewed sports. One of the main factors which athletes depend on during their performance is elastic energy coming straight from the AT. Contractile activity increases the muscular force and is known in science as post activation potentiation (PAP). Twelve basketball players (aged 21...
October 12, 2018: Sports
Di Lin, Neda Baktash, Shaif-Ul Alam, David J Richardson
We report the generation of high average output power, high peak power, and high pulse energy radially polarized picosecond pulses from a compact gain-switched laser-diode-seeded Yb-doped fiber master oscillator power amplifier (MOPA) system. A q-plate was employed as a mode converter prior to the final power amplifier to efficiently convert the linearly polarized Gaussian-shaped beam into a donut-shaped radially polarized beam. The desired vector beam was efficiently amplified yielding ∼110  ps pulses with a maximum output pulse energy of ∼30...
October 15, 2018: Optics Letters
Wing-Kai Lam, Ki-Kwang Lee, Sang-Kyoon Park, Jaejin Ryue, Suk-Hoon Yoon, Jiseon Ryu
BACKGROUND: The rapid and repetitive badminton lunges would produce strenuous impact loading on the lower extremities of players and these loading are thought to be the contributing factors of chronic knee injuries. This study examined the impact loading characteristics in various groups of badminton athletes performing extreme lunges. METHODS: Fifty-two participants classified into male skilled, female skilled, male unskilled, and female unskilled groups performed badminton lunge with their maximum-effort...
2018: PloS One
Carlos Balsalobre-Fernández, Mario Muñoz-López, David Marchante, Amador García-Ramos
Balsalobre-Fernández, C, Muñoz-López, M, Marchante, D, and García-Ramos, A. Repetitions in reserve and rate of perceived exertion increase the prediction capabilities of the load-velocity relationship. J Strength Cond Res XX(X): 000-000, 2018-This study aimed to (a) analyze the relationships between relative load (i.e., %1 repetition maximum; 1RM) and movement velocity, repetitions in reserve (RIR) and rate of perceived exertion (RPE) in competitive powerlifters and (b) examine whether a multiple linear regression model with the movement velocity, RIR, and RPE as predictor variables could improve the goodness of fit of the load-velocity relationship...
October 10, 2018: Journal of Strength and Conditioning Research
Rose Khavari, Saba N Elias, Timothy Boone, Christof Karmonik
AIM: To investigate if Multiple Sclerosis (MS) lesion characteristics affect functional brain connectivity (FC) during bladder voiding. METHODS: Twenty-seven ambulatory female patients with MS completed our functional magnetic resonance imaging (fMRI)/urodynamic testing (UDS) platform. Individual fMRI activation maps were generated at initiation of voiding. FC patterns of these regions were calculated and compared. Similarity of the FC pattern from one patient relative to all others was expressed by a parameter FC_sim...
October 12, 2018: Neurourology and Urodynamics
Stephan Skornitzke, Jessica Hirsch, Hans-Ulrich Kauczor, Wolfram Stiller
OBJECTIVES: To assess the influence of image noise on computed tomography (CT) perfusion studies, CT perfusion software algorithms were evaluated for susceptibility to image noise and results applied to clinical perfusion studies. METHODS: Digital perfusion phantoms were generated using a published deconvolution model to create time-attenuation curves (TACs) for 16 different combinations of blood flow (BF; 30/60/90/120 ml/100 ml/min) and flow extraction product (FEP; 10/20/30/40 ml/100 ml/min) corresponding to values encountered in clinical studies...
October 11, 2018: European Radiology
Roberto Laza-Cagigas, Mark Goss-Sampson, Eneko Larumbe-Zabala, Leke Termkolli, Fernando Naclerio
This study analysed the validity and reliability of a new optoelectronic device (Velowin) for the measurement of vertical displacement and velocity as well as to estimate force and mechanical power. Eleven trained males with Mean (SD) age = 27.4 (4.8) years, completed an incremental squat exercise test with 5 different loads (<30-90% of their 1-repetition maximum) while displacement and vertical velocity of the barbell were simultaneously measured using an integrated 3D system (3D motion capture system + force platform) and Velowin...
October 11, 2018: Journal of Sports Sciences
Matti Peitz, Michael Behringer, Urs Granacher
INTRODUCTION: To date, several meta-analyses clearly demonstrated that resistance and plyometric training are effective to improve physical fitness in children and adolescents. However, a methodological limitation of meta-analyses is that they synthesize results from different studies and hence ignore important differences across studies (i.e., mixing apples and oranges). Therefore, we aimed at examining comparative intervention studies that assessed the effects of age, sex, maturation, and resistance or plyometric training descriptors (e...
2018: PloS One
Timothy Sowers, Don VanderLaan, Andrei Karpiouk, Eleanor M Donnelly, Ethan Smith, Stanislav Emelianov
OBJECTIVES: Intravascular photoacoustic (IVPA) imaging is being developed to image atherosclerotic plaques, a leading cause of morbidity and mortality in the United States. However, the safety of this imaging modality, which requires repeated irradiation with short laser pulses, has not yet been investigated. This study has two objectives. First, determine in vitro the limit of cumulative fluence that can be applied to cells before death at IVPA relevant wavelengths. Second, evaluate if high single pulse fluences are a potential cause of cell death during IVPA imaging...
October 10, 2018: Lasers in Surgery and Medicine
Jacob A Goldsmith, Cameron Trepeck, Jessica L Halle, Kristin M Mendez, Alex Klemp, Daniel M Cooke, Michael H Haischer, Ryan K Byrnes, Robert F Zoeller, Michael Whitehurst, Michael C Zourdos
PURPOSE: The aim of this study was to examine the validity of two linear position transducers, the Tendo Weightlifting Analyzer System (TWAS) and Open Barbell System (OBS), compared to a criterion device, the Optotrak Certus Three-Dimensional Motion Capture System (OC3D). METHODS: Twenty-five males (age: 25±3yrs, height: 174.0±6.7cm, body mass: 89.0±14.7kg, squat one-repetition maximum-1RM: 175.8±34.7kg) with ≥2yrs of resistance training experience completed a back 1RM and one set to failure at 70% of 1RM...
October 9, 2018: International Journal of Sports Physiology and Performance
Evgeny A Lysenko, Daniil V Popov, Tatiana F Vepkhvadze, Anna P Sharova, Olga L Vinogradova
Lysenko, EA, Popov, DV, Vepkhvadze, TF, Sharova, AP, and Vinogradova, OL. Moderate-intensity strength exercise to exhaustion results in more pronounced signaling changes in skeletal muscles of strength-trained compared with untrained individuals. J Strength Cond Res XX(X): 000-000, 2018-The aim of our investigation was to compare the response pattern of signaling proteins and genes regulating protein synthesis and degradation in skeletal muscle after strength exercise sessions performed to volitional fatigue in strength-trained and untrained males...
October 5, 2018: Journal of Strength and Conditioning Research
Hesam Akbari, Hamed Soleimani, Majid Radfard, Hamed Biglari, Hossein Faraji, Samira Nabavi, Hamed Akbari, Amir Adibzadeh
The aim of this study is to determine the Aluminum concentration in groundwater resources of Sistan and Baluchestan province, Iran. See the data in this article. For the purpose of this study, a total of 871 water samples were collected and values of quality parameters including pH, turbidity, total dissolved solids (TDS) and Aluminum concentration were measured (with two-time repetitions) according to Standard Methods for the Examination of Water and Wastewater, during the year 2016. The mean, maximum, minimum of Aluminum concentrations in all groundwater resources of Sistan and Baluchistan province, were: 0...
October 2018: Data in Brief
Terry L Grindstaff, Marcus R Palimenio, Matthew Franco, Dillon Anderson, Jennifer J Bagwell, Dimitrios Katsavelis
Grindstaff, TL, Palimenio, MR, Franco, M, Anderson, D, Bagwell, JJ, and Katsavelis, D. Optimizing between-session reliability for quadriceps peak torque and rate of torque development measures. J Strength Cond Res XX(X): 000-000, 2018-Quadriceps peak torque and rate of torque development (RTD) have relevance for athletic performance and recovery after knee injury. The number of repetitions performed to determine RTD varies between studies, and the associated measurement error has not been established. The purpose of this study was to determine the number of repetitions necessary to optimize the between-session reliability for isometric quadriceps peak torque and RTD measures and to quantify estimates of measurement error...
October 4, 2018: Journal of Strength and Conditioning Research
Felipe Damas, Cintia Barcelos, Sanmy R Nóbrega, Carlos Ugrinowitsch, Manoel E Lixandrão, Lucas M E D Santos, Miguel S Conceição, Felipe C Vechin, Cleiton A Libardi
Damas, F, Barcelos, C, Nóbrega, SR, Ugrinowitsch, C, Lixandrão, ME, Santos, LMEd, Conceição, MS, Vechin, FC, and Libardi, CA. Individual muscle hypertrophy and strength responses to high vs. low resistance training frequencies. J Strength Cond Res XX(X): 000-000, 2018-The aim of this short communication was to compare the individual muscle mass and strength gains with high (HF) vs. low (LF) resistance training (RT) frequencies using data from our previous study. We used a within-subject design in which 20 subjects had one leg randomly assigned to HF (5× per week) and the other to LF (2 or 3× per week)...
October 4, 2018: Journal of Strength and Conditioning Research
Neil A Schwarz, Sarah K McKinley-Barnard
Multi-ingredient preworkout supplements (MIPS) are marketed as a means to increase exercise performance. The purpose of this study was to determine the effect of a single serving of Bang Pre-Workout Master Blaster (BMB) on upper- and lower-body power output and local muscular endurance. Ten resistance-trained males participated in two exercise testing sessions consisting of the vertical jump (VJ), seated medicine ball throw (SMBT), and local muscular endurance tests for the bench press (BP) and leg extension (LE) exercises at 70% of one-repetition maximum...
October 4, 2018: Journal of Dietary Supplements
Hung Cao Dinh, Rose Njemini, Oscar Okwudiri Onyema, Ingo Beyer, Keliane Liberman, Liza De Dobbeleer, Wim Renmans, Sam Vander Meeren, Kristin Jochmans, Andreas Delaere, Veerle Knoop, Ivan Bautmans
Ageing is characterized by a progressive decline in immune function known as immunosenescence (IS). While the causes of IS are likely to be multi-factorial, an age-associated accumulation of senescent T-cells and decreased naïve T-cell repertoire are key contributors to the phenomenon. On the other hand, there is a growing consensus that physical exercise may improve immune response in ageing. However, the optimum training modality required to obtain beneficial adaptations in older subjects is lacking. Therefore, we aimed to investigate the effects of exercise modality on T-cell phenotypes in older women...
October 4, 2018: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
Florian Schellenberg, William R Taylor, Adam Trepczynski, Renate List, Ines Kutzner, Pascal Schütz, Georg N Duda, Silvio Lorenzetti
Standard musculoskeletal simulation tools now offer widespread access to internal loading conditions for use in improving rehabilitation concepts or training programmes. However, despite broad reliance on their outcome, the accuracy of such loading estimations, specifically in deep knee flexion, remains generally unknown. The aim of this study was to evaluate the error of tibio-femoral joint contact force (JCF) calculations using musculoskeletal simulation compared to in vivo measured JCFs in subjects with instrumented total knee endoprostheses during squat exercises...
September 30, 2018: Medical Engineering & Physics
Paulo R P Nunes, Fernanda M Martins, Aletéia P Souza, Marcelo A S Carneiro, Claudio L Orsatti, Márcia A Michelin, Eddie F C Murta, Erick P de Oliveira, Fábio L Orsatti
OBJECTIVES: This study tested whether high-intensity interval training is a time-efficient strategy for improving visceral adiposity tissue and inflammatory markers in obese postmenopausal women when compared with combined training. Moreover, we tested whether change in visceral adiposity tissue is associated with alterations in these inflammatory markers. METHODS: Postmenopausal women were randomized in two groups: combined training (n = 13) and high-intensity interval training (n = 13)...
October 1, 2018: Menopause: the Journal of the North American Menopause Society
Jan Wilke, Stefanie Kaiser, Daniel Niederer, Kristin Kalo, Tobias Engeroff, Christian Morath, Lutz Vogt, Winfried Banzer
PURPOSE: A small share of the world's population meets current physical activity guidelines, which recommend regular engagement in endurance, strength, and neuromotor exercise. As lack of time represents a major cause of inactivity, multidimensional training methods with short durations may provide a promising alternative to classical, volume-oriented approaches focusing on one biomotor ability. This trial examined the effects of a high-intensity functional circuit training (HIFCT) on motor performance and exercise motivation in untrained adults...
October 1, 2018: Scandinavian Journal of Medicine & Science in Sports
Chan-Ho Jin, Hyun-Seung Rhyu, Joo Young Kim
It is important to treat obesity and the related noncommunicable diseases. The main objective of this study is the effect of different training types on inflammatory and immune markers in obesity. Seventeen obese men with body mass index (BMI)≥26 kg/m2 were randomly divided into two groups: aerobic training group (AT; n=9) and combined aerobic and resistance training group (CT; n=8). Body composition (weight, BMI, %body fat), factors of physical performance (one-repetition maximum [1RM], maximal oxygen uptake [VO2max ]), inflammatory markers (interleukin-6, tumor necrosis factor-alpha [TNF-α]), immune markers (leukocyte, natural killer cell) were analyzed before and after 8-week training...
August 2018: Journal of Exercise Rehabilitation
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