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Xiaoli Sun, Baitao Zhang, Bingzheng Yan, Guoru Li, Hongkun Nie, Kejian Yang, Chengqian Zhang, Jingliang He
Few-layered titanium carbide (Ti3 C2 Tx ), a novel two-dimensional (2D) Van der Waals material in the MXene family, was fabricated with a liquid-phase method and applied as a saturable absorber for a continuous-wave mode-locked femtosecond bulk laser. Pulses as short as 316 fs with a repetition rate of 64.06 MHz and maximum output power of 0.77 W were achieved at the central wavelength of 1053.2 nm, demonstrating the first known, to the best of our knowledge, application of MXene in an all-solid-state laser...
August 15, 2018: Optics Letters
Timothy J Suchomel, Christopher B Taber, Christopher J Sole, Michael H Stone
The purpose of this study was to examine the force-time differences between concentric-only half-squats (COHS) performed with ballistic (BAL) or non-ballistic (NBAL) intent across a range of loads. Eighteen resistance-trained men performed either BAL or NBAL COHS at 30%, 50%, 70%, and 90% of their one repetition maximum (1RM) COHS. Relative peak force (PF) and relative impulse from 0⁻50 ms (Imp50), 0⁻90 ms (Imp90), 0⁻200 ms (Imp200), and 0⁻250 ms (Imp250) were compared using a series of 2 × 4 (intent × load) repeated measures ANOVAs with Bonferroni post hoc tests...
August 12, 2018: Sports
Christopher M Myers, Jeong-Su Kim, Megan Musilli, Kevin McCully, John P Florian
Purpose: This study examined the effects of repeated long-duration water immersions (WI)s at 1.35 atmospheres absolute (ATA) on neuromuscular endurance performance. We hypothesized that, following 5 days of consecutive, resting, long-duration WIs, neuromuscular endurance performance would decrease. Methods: Fifteen well-trained, male subjects completed five consecutive 6-h resting WIs with 18-h surface intervals during the dive week while breathing compressed air at 1.35 ATA. Skeletal muscle endurance performance was assessed before and after each WI, and 24 and 72 h after the final WI...
2018: Frontiers in Physiology
Lucas Bet da Rosa Orssatto, Bruno Monteiro de Moura, Raphael Luiz Sakugawa, Regis Radaelli, Fernando Diefenthaeler
The aim of this study was to investigate whether 12 weeks of leg press strength training exercise could affect the conventional and functional hamstring:quadriceps ratios in the elderly. Twelve elderly participants were submitted to a 12 week progressive training protocol (two sessions/week) using a 45° leg press exercise. A significant increase in the one repetition maximum was observed after 4, 8, and 12 weeks (p = 0.001, p < 0.001, and p < 0.001, respectively) compared to week 0 and after 8 (p = 0...
July 2018: Journal of Bodywork and Movement Therapies
Lucas Bet da Rosa Orssatto, Ewertton de Souza Bezerra, Bruno Monteiro de Moura, João Antônio Chula de Castro, Diego Augusto Santos Silva, Antônio Renato Pereira Moro, Fernando Diefenthaeler
The aims of this pilot study were to verify which muscle strength tests better explain bone mineral content (BMC) of the femoral neck and lumbar spine and to develop predictive equations to estimate femoral neck and lumbar spine BMC. Twenty-nine subjects aged 56-76 years old (12 women and 17 men) participated in the study. Femoral neck and lumbar spine BMC was evaluated by Dual X-ray absorptiometry (DXA). Muscle strength measurements included maximal isometric voluntary contractions of knee extensors and flexors, vertical jump, 5-repetition maximum of the leg press (5-RMLP ) and seated leg curl (5-RMLC ), and handgrip strength...
July 2018: Journal of Bodywork and Movement Therapies
Brendyn B Appleby, Harry Banyard, Prue Cormie, Stuart J Cormack, Robert U Newton
Appleby, BB, Banyard, H, Cormie, P, Cormack, SJ, and Newton, RU. Validity and reliability of methods to determine barbell displacement in heavy back squats: Implications for velocity-based training. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to investigate the validity and reliability of methods for determining barbell displacement during heavy back squats. Twelve well-trained rugby union players (mean ± SD 1 repetition maximum [1RM] 90° squat = 196.3 ± 29.2 kg) completed 2 sets of 2 repetitions at 70, 80, and 90% of 1RM squats...
August 8, 2018: Journal of Strength and Conditioning Research
Igor Grabovac, Sandra Haider, Eva Winzer, Ali Kapan, Karin E Schindler, Christian Lackinger, Thomas E Dorner
OBJECTIVE: To measure health effects in lay volunteers who made home visits consisting of social interaction, nutritional and physical exercise interventions to pre-frail and frail older people (trial registration, NCT01991639). METHODS: After baseline, participants were followed-up at 12 (V1) and 24 (V2) weeks. A one-repetition maximum (1-RPM) and handgrip were measured with the Concept2®DYNO and a dynamometer. The Physical Activity Scale for the Elderly was used to assess physical activity, and Food Frequency Questionnaire and the Mediterranean Diet Adherence Screener for nutrition...
August 9, 2018: Wiener Klinische Wochenschrift
Treya M Long, Shoshana R Rath, Karen E Wallman, Erin K Howie, Leon M Straker, Andrew Bullock, Thomas S Walwyn, Nicholas G Gottardo, Catherine H Cole, Catherine S Choong, Louise H Naylor
Adolescent and young adult (AYA) survivors of pediatric oncology related cerebral insult are vulnerable to numerous treatment-induced deficits that significantly enhance cardiovascular disease risk. Regular exercise improves endothelial function, fitness, body composition and musculoskeletal function which may reduce predisposition for cardiovascular disease. Here we assessed the feasibility and effectiveness of a 24-week exercise intervention on cardiovascular, physical and metabolic outcomes in this population...
2018: PloS One
Jong-Chi Oh, Jae-Sung Kwon
OBJECTIVE: The effect of a resistive jaw-opening exercise using an elastic band on suprahyoid muscle activity and tongue strength was examined in healthy volunteers. METHODS: Twenty-one adults wore an elastic loop around their head and mandible. To prescribe the appropriate elastic band resistance, the 10-repetition maximum (10 RM) was measured among 4 bands at baseline. Band loops, starting with the highest resistance value band, were sequentially applied to determine the suitability for 10 RM...
August 8, 2018: Folia Phoniatrica et Logopaedica
Zohre Sadat Hosseinipour, Maryam Pirmoradian-Najafabadi, Sima Shahabi
Background: This study sought to assess the effect of Er,Cr:YSGG laser power on the surface roughness of lased radicular dentin using atomic force microscopy (AFM). Methods: Fifteen human radicular dentin samples were randomly divided into five groups: one control (G1, intact) and four experimental groups treated with 0.25W (G2), 0.5W (G3), 0.75W (G4) and 1W (G5) powers of Er,Cr:YSGG laser (2.78µm) at a repetition rate of 20 Hz, with a 600-µm-diameter sapphire tip. After irradiation, surface topography was analyzed by AFM using a Si probe in tapping mode...
2018: Journal of Dental Research, Dental Clinics, Dental Prospects
Carlo Fornaini, Elisabetta Merigo, Federica Poli, Jean-Paul Rocca, Stefano Selleri, Giuseppe Lagori, Annamaria Cucinotta
Background and Aim: An important surgical goal is to provide a first intention wound healing without trauma produced by sutures and for this aim in the past several methods have been tested. The aim of this ex vivo preliminary study was to demonstrate the capacity of a 1070 nm pulsed fiber laser to treat the dental fractures by enamel and dentine melting with the apposition of hydroxyapatite nanoparticles as filler. Methods: Out of thirty freshly-extracted human third molars, decay-free, twenty-four cylinders of 5 mm thickness were obtained to perform the test...
June 30, 2018: Laser Therapy
Jesús Vera, Raimundo Jiménez, Beatríz Redondo, Alejandro Torrejón, Carlos Gustavo De Moraes, Amador García-Ramos
BACKGROUND: We aimed to evaluate the influence of the level of effort during four basic resistance exercises leading to muscular failure on intraocular pressure (IOP) and ocular perfusion (OPP), as well as the role of exercise type and sex. METHODS: Twenty-five young adults (12 women) performed 10 repetitions against their 10-RM (repetition maximum) load in the squat, military press, biceps curl and calf raise exercises. IOP was measured before, during and after exercise, whereas OPP was indirectly assessed before and after each exercise...
August 7, 2018: European Journal of Sport Science
Katherine O Gotham, Greg J Siegle, Gloria T Han, Andrew J Tomarken, Rachel N Crist, David M Simon, James W Bodfish
BACKGROUND: Autism spectrum disorder (ASD) is marked by repetitive thinking and high rates of depression. Understanding the extent to which repetitive negative thinking in ASD reflects autistic stereotypy versus general depressive thinking patterns (e.g., rumination) could help guide treatment research to improve emotional health in ASD. We compared associations between rumination, depressive symptoms, and pupil response to social-emotional material in adults with ASD and typically developing (TD) adults with and without depression...
2018: PloS One
Juliane Mueller, Josefine Stoll, Steffen Mueller, Frank Mayer
BACKGROUND: Core-specific sensorimotor exercises are proven to enhance neuromuscular activity of the trunk, improve athletic performance and prevent back pain. However, the dose-response relationship and, therefore, the dose required to improve trunk function is still under debate. The purpose of the present trial will be to compare four different intervention strategies of sensorimotor exercises that will result in improved trunk function. METHODS/DESIGN: A single-blind, four-armed, randomized controlled trial with a 3-week (home-based) intervention phase and two measurement days pre and post intervention (M1/M2) is designed...
August 6, 2018: Trials
Harry G Banyard, James J Tufano, Jose Delgado, Steve W Thompson, Kazunori Nosaka
PURPOSE: This study compared kinetic and kinematic data from three different velocity-based training (VBT) sessions and a 1-repetition maximum (1RM) percent-based training (PBT) session using full-depth, free-weight back squats with maximal concentric effort. METHODS: Fifteen strength-trained men performed four randomized resistance-training sessions 96-hours apart: PBT session involved five sets of five repetitions using 80%1RM; load-velocity profile (LVP) session contained five sets of five repetitions with a load that could be adjusted to achieve a target velocity established from an individualized LVP equation at 80%1RM; fixed sets 20% velocity loss threshold (FSVL20) session that consisted of five sets at 80%1RM but sets were terminated once the mean velocity (MV) dropped below 20% of the threshold velocity or when five repetitions were completed per set; variable sets 20% velocity loss threshold (VSVL20) session comprised 25-repetitions in total, but participants performed as many repetitions in a set as possible until the 20% velocity loss threshold was exceeded...
August 6, 2018: International Journal of Sports Physiology and Performance
Grant W Ralston, Lon Kilgore, Frank B Wyatt, Duncan Buchan, Julien S Baker
BACKGROUND: The current recommendations for resistance training (RT) frequency range from 2 to 5 days per week (days week- 1 ) depending on the subjects' training status. However, the relationship between RT frequency and muscular strength remains controversial with reported variances existing across different population groups. We conducted a meta-analysis that (1) quantified the effects of low (LF; 1 day week- 1 ), medium (MF; 2 days week- 1 ), or high (HF; ≥ 3 days week- 1 ) RT frequency on muscular strength per exercise; (2) examined the effects of different RT frequency on one repetition maximum (1RM) strength gain profiles (multi-joint exercises and single joint exercises); (3) examined the effects of different RT frequency on 1RM strength gain when RT volume is equated; and (4) examined the effects of different RT frequency on 1RM strength gains on upper and lower body...
August 3, 2018: Sports Medicine—Open
Xiaodan Dou, Yanjun Ma, Min Zhu, Honghao Xu, Degao Zhong, Bing Teng, Junhai Liu
We report on a miniature Yb:LuPO4 crystal laser at 1.01 μm that is passively Q-switched with a sapphire-based few-layer WS2 saturable absorber, and that can be operated under very high output couplings (≥80%). With 12.6 W of pump power absorbed, an average output power of 4.35 W is generated at a repetition rate of 1.33 MHz with a slope efficiency of 47%. The maximum pulse energy and highest peak power achieved are 3.41 μJ and 110 W, respectively; while the shortest pulse duration obtained is 28.6 ns...
August 1, 2018: Optics Letters
Brin Freund, John C Probasco, Eva K Ritzl
OBJECTIVE Delay in diagnosis and subsequent treatment of nonconvulsive seizures can lead to worsened outcomes. The gold standard in detecting nonconvulsive seizures is continuous video-electroencephalography (cEEG). Compared to routine, 30-minute EEG, the use of cEEG increases the likelihood of capturing intermittent nonconvulsive seizures. Studies of critically ill patients in intensive care units demonstrate a particularly high rate of nonconvulsive seizures. Some of these studies included postneurosurgical patients, but often subanalyses of specific populations were not done...
June 1, 2018: Journal of Neurosurgery
Luke Carlson, Brandon Jonker, Wayne L Westcott, James Steele, James P Fisher
A key variable within resistance training (RT) is that of repetition duration; the time (seconds; s) taken to perform the concentric and eccentric muscle actions of a repetition. Research has produced equivocal results with regards to strength and muscle mass increases whilst many studies have created parity in the number of repetitions though there has been a disparity in load used and time-under-load (TUL). The purpose of this study was to compare load, and TUL matched groups performing resistance exercise using differing repetition durations...
August 1, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Ashish Kumar Singh, Makkhan Lal Meena, Himanshu Chaudhary
PURPOSE: Loss of static muscular strength is the most common work-related problem among handicraft workers involved in hand-intensive jobs. A cross-sectional comparative assessment was carried out to determine the muscular strength among the workers involved in the manufacturing of three different crafts, i.e., weaving, hand block printing, and imitation jewelry Methods: 120 female operatives' were selected, and digital grip dynamometers were used to measure their maximum handgrip and pinch strength...
July 31, 2018: International Journal of Occupational Safety and Ergonomics: JOSE
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