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Yongzhong Li, Xuyang Zhang, Jie Dai, Jiasheng Wang, Hao Wu, Junhui Liu, Jian Chen, Yixiao Zhu, Fengdong Zhao
BACKGROUND: Previous studies of percutaneous endoscopic lumbar discectomy (PELD) for the treatment of lumbar disc herniation (LDH) have shown good clinical results. However, there is limited information about the post-operative improvement in back muscle function. We aimed to determine whether changes in neuromuscular patterns, assessed using the flexion-relaxation phenomenon (FRP), could be observed following PELD surgery. METHODS: Thirty patients participated in the study...
February 15, 2019: World Neurosurgery
Michelle Willcox, Amnesty LeFevre, Enid Mwebaza, Josephine Nabukeera, Gabrielle Conecker, Peter Johnson
Background: Many countries in sub-Saharan Africa still face significant challenges in maternal and child health where low numbers, uneven distribution, and training deficits of the health workforce impede quality care. Low-dose, high-frequency training (LDHF), an innovative approach to in-service training, focuses on competency, team-based repetitive learning and practice in the clinical setting. In Uganda, we conducted cost analyses of local organization LDHF training programs for Post-abortion care (PAC) and Pediatric HIV to assess cost drivers and cost efficiency and compare costs to traditional workshop based training...
June 2019: Journal of Global Health
Dsg Scrimgeour, R Patel, N Patel, J Cleland, A J Lee, A J McKinley, Fct Smith, G Griffiths, P A Brennan
INTRODUCTION: Healthcare professionals increasingly recognise how human factors (HF) can contribute to medical error. An understanding of HF is also important during other high stakes activities such as summative assessments or examinations. National organisations hosting such events need to be aware of potential fatigue, boredom and stress that can occur in interviewers during these often repetitive activities. METHODS: A previously validated questionnaire based around the well known HF analysis and classification system (HFACS) was used to evaluate four factors (care and support, asking questions about the role as an interviewer, working within the rules and boundaries, and stress and pressure) at the 2018 UK general and vascular surgery trainee national selection process...
February 18, 2019: Annals of the Royal College of Surgeons of England
Jonathan D Miller, Adam J Sterczala, Michael A Trevino, Mandy E Wray, Hannah L Dimmick, Trent J Herda
PURPOSE: Previous research has indicated greater muscle activation is needed for children (CH) to match relative intensity submaximal contractions in comparison with adults (AD). However, no study has compared motor unit (MU) firing and recruitment patterns between children and adults. Therefore, MU action potential amplitudes (MUAPAMP ) and firing rates were examined during two repetitive submaximal contractions of the first dorsal interosseous in children and adults. METHODS: Twenty-two children (age 9...
February 15, 2019: European Journal of Applied Physiology
Tianhao Xian, Li Zhan, Lirun Gao, Wenyan Zhang, Wenchao Zhang
We propose and demonstrate a passively Q-switched Er-doped fiber laser based on pure water as the saturable absorber (SA). The SA is made of two optical ferrules matched with a cannula, and the gap between the end-facets is filled with pure water. The nonlinear response of this SA has been characterized, and stable Q-switching operation at 1558.03 nm has been achieved. The maximum output power is 21.1 mW with 65.0 kHz repetition rate. The duration is 1.44 μs, and the pulse energy reaches 324.8 nJ. To the best of our knowledge, this is the first demonstration of the passively Q-switched laser with pure water as the SA...
February 15, 2019: Optics Letters
Michał Wilk, Małgorzata Michalczyk, Artur Gołaś, Michał Krzysztofik, Adam Maszczyk, Adam Zając
The aim of this study was to determine the effect of carbohydrate-protein supplementation with whey protein (CHO-PROw) after resistance training, and casein protein (PROc) before bedtime on the concentration of growth hormone (GH), insulin (I) and insulin-like growth factor (IGF-1), as well as serum creatine kinase (CK) activity. Twelve strength trained male subjects (age: 25.8 ± 4.7 years; training experience 6.1 ± 0.79 years; body mass 75.9 ± 2.7 kg; body height 171.8 ± 13.3 cm) were recruited for the study...
December 2018: Biology of Sport
Chelsea C McKean, Brandon A Baiamonte, Robert R Kraemer, Daniel B Hollander
The primary goal of this study was to investigate the effects of attention-deficit/hyperactivity disorder (ADHD) medications on exercise-induced hypoalgesia (EIH), heart rate, and perceived exertion. Thirty college-age students (10 Controls, 10 ADHD diagnosis, and 10 ADHD diagnosis with medications) completed 2 sessions: 1) a maximal testing session and 2) an experimental session consisting of 3 consecutive dynamic resistance exercise circuits comprised of 12 repetitions of 9 exercises at 60% of 1-repetition maximum using a 1:1 work to rest ratio...
December 2018: Biology of Sport
Ibrahim H Abu-Tahun, Sang Won Kwak, Jung-Hong Ha, Asgeir Sigurdsson, Mehmet Baybora Kayahan, Hyeon-Cheol Kim
This study compared the torque generation during canal shaping with a nickel-titanium endodontic instrument according to the extent of glide-path establishment. Seventy-five simulated S-shaped canal blocks were divided into five groups (n = 15) according to the number of repetitive insertions to the working length using a One G glide-path instrument: groups with 5, 10, 15, and 20 insertions as well as group Z without glide-path establishment. When the tip of the One G file reached the working length, the file was moved back and forth repetitively at the working length for the designated number of times for each group...
February 5, 2019: Materials
Michael C Zourdos, Jacob A Goldsmith, Eric R Helms, Cameron Trepeck, Jessica L Halle, Kristin M Mendez, Daniel M Cooke, Michael H Haischer, Colby A Sousa, Alex Klemp, Ryan K Byrnes
Zourdos, MC, Goldsmith, JA, Helms, ER, Trepeck, C, Halle, JL, Mendez, KM, Cooke, DM, Haischer, MH, Sousa, CA, Klemp, A, and Byrnes, RK. Proximity to failure and total repetitions performed in a set influences accuracy of intraset repetitions in reserve-based rating of perceived exertion. J Strength Cond Res XX(X): 000-000, 2019-The aim of this study was to assess the accuracy of predicting repetitions in reserve (RIR) intraset using the RIR-based rating of perceived exertion (RPE) scale. Twenty-five men (age: 25...
February 7, 2019: Journal of Strength and Conditioning Research
Alejandro Pérez-Castilla, Dejan Suzovic, Aleksandra Domanovic, John F T Fernandes, Amador García-Ramos
Pérez-Castilla, A, Suzovic, D, Domanovic, A, Fernandes, JFT, and García-Ramos, A. Validity of different velocity-based methods and repetitions-to-failure equations for predicting the 1 repetition maximum during 2 upper-body pulling exercises. J Strength Cond Res XX(X): 000-000, 2019-This study aimed to compare the accuracy of different velocity-based methods and repetitions-to-failure equations for predicting the 1 repetition maximum (i.e., maximum load that can be lifted once; 1RM) during 2 upper-body pulling exercises...
February 6, 2019: Journal of Strength and Conditioning Research
Estêvão R Monteiro, Pablo B Costa, Victor Gonçalves Corrêa Neto, Barbara J Hoogenboom, James Steele, Jefferson da Silva Novaes
Monteiro, ER, Costa, PB, Corrêa Neto, VG, Hoogenboom, BJ, Steele, J, and da Silva Novaes, J. Posterior thigh foam rolling increases knee extension fatigue and passive shoulder range-of-motion. J Strength Cond Res XX(X): 000-000, 2019-The purpose of this study was to analyze the acute effects of different foam rolling (FR) volumes on knee extensors fatigue and shoulder passive range-of-motion (PROM). Twelve recreationally active women were recruited for participation in 2 experiments separated by 3 weeks, and the same subjects performed all procedures in each experiment...
February 6, 2019: Journal of Strength and Conditioning Research
Simon A Feros, Warren B Young, Brendan J OʼBrien
Feros, SA, Young, WB, and O'Brien, BJ. Efficacy of combined general, special, and specific resistance training on pace bowling skill in club-standard cricketers. J Strength Cond Res XX(X): 000-000, 2018-This study investigated the efficacy of combined "general," "special," and "specific" resistance training on pace bowling skill. Twelve male, club-standard pace bowlers were randomly allocated to a combined resistance training (CRT) program or traditional cricket training (TCT) program for 8 weeks...
February 6, 2019: Journal of Strength and Conditioning Research
David B Copithorne, Charles L Rice
PURPOSE: Blood flow restriction (BFR) with low-intensity (< 30% of 1 repetition maximum strength) muscle contraction has been used chronically (> 4 weeks) to enhance resistance training. However, mechanisms underlying muscle adaptations following BFR are not well understood. To explore changes related to chronic BFR adaptations, the current study used blood flow occlusion (BFO) during an acute bout of low-intensity isometric fatiguing contractions to assess peripheral (muscle) factors affected...
February 8, 2019: European Journal of Applied Physiology
Yang Shi, Chunqing Gao, Shuo Wang, Shanghua Li, Rui Song, Meng Zhang, Mingwei Gao, Qing Wang
A high-energy, single-frequency, injection-seeded, Q-switched Er:YAG laser oscillating at 1645 nm is demonstrated. For obtaining high output energy, a double-crystals-end-pumping architecture is utilized. The maximum output energies of single-frequency pulses are 12.84 mJ, 16.87 mJ, and 20.3 mJ at pulse repetition rates of 500 Hz, 300 Hz and 200 Hz, respectively. Correspondingly, the pulse widths are 162 ns, 125 ns, and 110 ns, respectively. The half-width of the pulse spectrum at the pulse repetition rate of 200 Hz is 4...
February 4, 2019: Optics Express
Andrew M Holwerda, Kevin J M Paulussen, Maarten Overkamp, Joy P B Goessens, Irene Fleur Kramer, Will K W H Wodzig, Lex B Verdijk, Luc J C van Loon
Background: Age-related decline in skeletal muscle mass is at least partly attributed to anabolic resistance to food intake. Resistance exercise sensitizes skeletal muscle tissue to the anabolic properties of amino acids. Objective: The present study assessed protein digestion and amino acid absorption kinetics, whole-body protein balance, and the myofibrillar protein synthetic response to ingestion of different amounts of protein during recovery from resistance exercise in older men...
February 4, 2019: Journal of Nutrition
Ozkan Isik, Ilkay Dogan
BACKGROUND: It is known that different intensity exercises create skeletal muscle damage at different levels. The purpose of the study was to compare effects of bilateral or unilateral lower body resistance exercise on markers of skeletal muscle damage. METHODS: The Brzycki Formula was used to calculate participants' one repetition maximum strength for each movement and limb, separately. Blood samples were obtained before exercise, immediately after exercise, and 30 min after exercise for both types of exercise...
December 2018: Biomedical Journal
Brendyn B Appleby, Robert U Newton, Stuart J Cormack
Appleby, BB, Newton, RU, and Cormack, SJ. Kinetics and kinematics of the squat and step-up in well-trained rugby players. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to compare and contrast the kinetics and kinematics of squat and step-up performance in well-trained athletes. Triaxial ground reaction force (GRF) and 3D kinematic data were collected in 4 maximal effort repetitions each at 70, 80, and 90% of 1 repetition maximum (1RM) of squat and step-up. The difference in concentric phase kinetics and kinematics between the squat and step-up was compared using effect sizes (ES ± 90% confidence limits [CLs]) classified as: less than 0...
January 30, 2019: Journal of Strength and Conditioning Research
Mohamed Nashrudin Bin Naharudin, Ashril Yusof, Harry Shaw, Matthew Stockton, David J Clayton, Lewis J James
Bin Naharudin, MN, Yusof, A, Shaw, H, Stockton, M, Clayton, DJ, and James, LJ. Breakfast omission reduces subsequent resistance exercise performance. J Strength Cond Res XX(X): 000-000, 2019-Although much research has examined the influence of morning carbohydrate intake (i.e., breakfast) on endurance performance, little is known about its effects on performance in resistance-type exercise. Sixteen resistance-trained men (age 23 ± 4 years, body mass 77.56 ± 7.13 kg, and height 1.75 ± 0.04 m) who regularly (≥3 day/wk) consumed breakfast completed this study...
January 30, 2019: Journal of Strength and Conditioning Research
Brad Griffiths, James Grant, Louis Langdown, Paulo Gentil, James Fisher, James Steele
PURPOSE: Resistance training is often performed in a traditional training style using deliberate relatively longer repetition durations or in an explosive training style using maximal intended velocities and relatively shorter repetition durations. Both improve strength, "power" (impulsivity), and speed. This study compared explosive and traditional training over a 6-week intervention in 30 healthy young adult male recreational soccer players. METHOD: Full body supervised resistance training was performed 2 times a week using 3 sets of each exercise at 80% of one repetition maximum to momentary failure...
February 1, 2019: Research Quarterly for Exercise and Sport
Chuan-Peng Qian, Bao-Quan Yao, Ben-Rui Zhao, Gao-You Liu, Xiao-Ming Duan, Tong-Yu Dai, You-Lun Ju, Yue-Zhu Wang
We demonstrate a 102 W middle infrared ZnGeP2 (ZGP) optical parametric amplifier (OPA) pumped by a 2097-nm Q-switched Ho:YAG laser at a pulse repetition frequency of 10 kHz. The seed middle infrared laser was produced by a ZGP optical parametric oscillator. Its average power was 28.4 W pumped by a 50 W 2097-nm laser. By thermal lens compensation, the beam factor M2 reduced from 3.1 to 2.1. When the incident Ho pump power was 120 W, the middle infrared ZGP OPA yielded the maximum average output power of 102 W and slope efficiency of 61...
February 1, 2019: Optics Letters
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