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rate of force development training

Gerald T Mangine, Jay R Hoffman, Ran Wang, Adam M Gonzalez, Jeremy R Townsend, Adam J Wells, Adam R Jajtner, Kyle S Beyer, Carleigh H Boone, Amelia A Miramonti, Michael B LaMonica, David H Fukuda, Nicholas A Ratamess, Jeffrey R Stout
PURPOSE: To compare the effects of two different resistance training programs, high intensity (INT) and high volume (VOL), on changes in isometric force (FRC), rate of force development (RFD), and barbell velocity during dynamic strength testing. METHODS: Twenty-nine resistance-trained men were randomly assigned to either the INT (n = 15, 3-5 RM, 3-min rest interval) or VOL (n = 14, 10-12 RM, 1-min rest interval) training group for 8 weeks. All participants completed a 2-week preparatory phase prior to randomization...
October 15, 2016: European Journal of Applied Physiology
Xiaoyun Hu, Xiuming Xi, Penglin Ma, Haibo Qiu, Kaijiang Yu, Yaoqing Tang, Chuanyun Qian, Qiang Fang, Yushan Wang, Xiangyou Yu, Yuan Xu, Bin Du
BACKGROUND: The aim of this study is to develop consensus on core competencies required for postgraduate training in intensive care medicine. METHODS: We used a combination of a modified Delphi method and a nominal group technique to create and modify the list of core competencies to ensure maximum consensus. Ideas were generated modified from Competency Based Training in Intensive Care Medicine in Europe collaboration (CoBaTrICE) core competencies. An online survey invited healthcare professionals, educators, and trainees to rate and comment on these competencies...
October 16, 2016: Critical Care: the Official Journal of the Critical Care Forum
S Tsitkanou, K Spengos, A-N Stasinaki, N Zaras, G Bogdanis, G Papadimas, G Terzis
Aim of the study was to investigate whether high-intensity interval cycling performed immediately after resistance training would inhibit muscle strength increase and hypertrophy expected from resistance training per se. Twenty-two young men were assigned into either resistance training (RE; N = 11) or resistance training plus high-intensity interval cycling (REC; N = 11). Lower body muscle strength and rate of force development (RFD), quadriceps cross-sectional area (CSA) and vastus lateralis muscle architecture, muscle fiber type composition and capillarization, and estimated aerobic capacity were evaluated before and after 8 weeks of training (2 times per week)...
September 23, 2016: Scandinavian Journal of Medicine & Science in Sports
Michelle Chiu, Jordan Tarshis, Andreas Antoniou, T Laine Bosma, Jessica E Burjorjee, Neil Cowie, Simone Crooks, Kate Doyle, David Dubois, Tobias Everett, Rachel Fisher, Megan Hayter, Genevieve McKinnon, Diana Noseworthy, Noel O'Regan, Greg Peachey, Arnaud Robitaille, Michael Sullivan, Marshall Tenenbein, Marie-Helene Tremblay
The specialty of anesthesiology will soon adopt the Competence By Design (CBD) approach to residency education developed by the Royal College of Physicians and Surgeons of Canada (RCPSC). A foundational component of CBD is frequent and contextualized assessment of trainees. In 2013, the RCPSC Anesthesiology Specialty Committee assembled a group of simulation educators, representing each of the 17 Canadian anesthesiology residency programs, to form the Canadian National Anesthesiology Simulation Curriculum (CanNASC) Task Force...
September 16, 2016: Canadian Journal of Anaesthesia, Journal Canadien D'anesthésie
John S Ikonomidis
BACKGROUND: The Society of Thoracic Surgeons (STS) has intermittently surveyed its workforce, providing isolated accounts of the current state of thoracic surgical practice. METHODS: The 63-question survey instrument was received by 4,343 surgeon members of the STS, and responses were gathered between October 1 and November 5, 2014. The return rate was 29.1%. RESULTS: The median age of the active United States thoracic surgeons is 54 years...
September 7, 2016: Annals of Thoracic Surgery
Zbidi Sana, Badrane Zinoubi, Omar Hammouda, Henry Vandewalle, Virgile Serrau, Tarak Driss
BACKGROUND: The effects of a six-week maximal voluntary isometric co-contraction (MIVCC) training program of the elbow flexor and extensor muscles on maximal and explosive muscle strength have been studied. METHODS: Ten active men underwent 6-week MIVCC. Maximal rate of force development (MRFD) of the elbow flexor (MRFDflex) and extensor (MRFDext) were measured in addition to maximal voluntary contraction (MVC) of these muscles (MVCflex and MVCext) before (T0), after 4-week (T1) and 6-week (T2) MIVCC training program...
September 14, 2016: Journal of Sports Medicine and Physical Fitness
Jacob E Earp, Robert U Newton, Prue Cormie, Anthony J Blazevich
INTRODUCTION: Tendon dynamics influence movement performance and provide the stimulus for long-term tendon adaptation. As tendon strain increases with load magnitude and decreases with loading rate, changes in movement speed during exercise should influence tendon strain. METHODS: Ten resistance-trained men [squat one repetition maximum (1RM) to body mass ratio: 1.65 ± 0.12] performed parallel-depth back squat lifts with 60% of 1RM load at three different speeds: slow fixed-tempo (TS: 2-s eccentric, 1-s pause, 2-s concentric), volitional-speed without a pause (VS) and maximum-speed jump (JS)...
2016: Frontiers in Physiology
Yanping Lin, Huajiang Chen, Dedong Yu, Ying Zhang, Wen Yuan
PURPOSE: Bone drilling simulators with virtual and haptic feedback provide a safe, cost-effective and repeatable alternative to traditional surgical training methods. To develop such a simulator, accurate haptic rendering based on a force model is required to feedback bone drilling forces based on user input. Current predictive bone drilling force models based on bovine bones with various drilling conditions and parameters are not representative of the bone drilling process in bone surgery...
August 22, 2016: International Journal of Computer Assisted Radiology and Surgery
Ashkan Radmand, Erik Scheme, Kevin Englehart
Several multiple degree-of-freedom upper-limb prostheses that have the promise of highly dexterous control have recently been developed. Inadequate controllability, however, has limited adoption of these devices. Introducing more robust control methods will likely result in higher acceptance rates. This work investigates the suitability of using high-density force myography (HD-FMG) for prosthetic control. HD-FMG uses a high-density array of pressure sensors to detect changes in the pressure patterns between the residual limb and socket caused by the contraction of the forearm muscles...
2016: Journal of Rehabilitation Research and Development
Erika Zemková, Oľga Kyselovičová, Michal Jeleň, Zuzana Kováčiková, Gábor Ollé, Gabriela Štefániková, Tomáš Vilman, Miroslav Baláž, Timea Kurdiová, Jozef Ukropec, Barbara Ukropcová
This study evaluates the effect of 3 months resistance and aerobic training on muscle strength and power in 17 male overweight and obese men. Subjects underwent either a resistance or aerobic training for a period of 3 months (three sessions per week). Peak isometric force, rate of force development, peak power and height of countermovement and squat jumps, reactive strength index, and mean power in the concentric phase of bench presses were all assessed prior to and after completing the training program. Results identified a significant increase of mean power during both countermovement bench presses at 30 kg (18...
August 15, 2016: American Journal of Men's Health
Lin Liu, Karen Messer, John A Baron, David A Lieberman, Elizabeth T Jacobs, Amanda J Cross, Gwen Murphy, Maria Elena Martinez, Samir Gupta
PURPOSE: Following colonoscopic polypectomy, US Multisociety Task Force (USMSTF) guidelines stratify patients based on risk of subsequent advanced neoplasia (AN) using number, size, and histology of resected polyps, but have only moderate sensitivity and specificity. We hypothesized that a state-of-the-art statistical prediction model might improve identification of patients at high risk of future AN and address these challenges. METHODS: Data were pooled from seven prospective studies which had follow-up ascertainment of metachronous AN within 3-5 years of baseline polypectomy (combined n = 8,228)...
October 2016: Cancer Causes & Control: CCC
Dean L Mayfield, Andrew G Cresswell, Glen A Lichtwark
Compliant tendons permit mechanically unfavourable fascicle dynamics during fixed-end contractions. The purpose of this study was to reduce the effective compliance of tendon and investigate how small reductions in active shortening affect twitch kinetics and contractile performance in response to a second stimulus. The series elastic element (SEE) of the human triceps surae (N=15) was effectively stiffened by applying a 55 ms rotation to the ankle, through a range of 5°, at the onset of twitch and doublet [interstimulus interval (ISI) of 80 ms] stimulation...
August 10, 2016: Journal of Experimental Biology
Björn A Alkner, Lena Norrbrand, Per A Tesch
INTRODUCTION: This study examined the effects of long-term bed rest with or without a concurrent resistance exercise protocol on different muscle function indices of the knee extensors and their influence on previously shown atrophy, neural impairment, and slow-to-fast phenotype shift. METHODS: Nine men underwent 90 d of bed rest only (BR), while eight men in addition performed maximal supine squats every third day (BRE). Before and at day 1 and 5 following bed rest, surface quadriceps electromyographic (EMG) activity was measured during a sustained (60-s) submaximal isometric action and rate of force development (RFD) was assessed during a maximal isometric action, both in the supine squat position...
July 2016: Aerospace Medicine and Human Performance
N Ihalainen-Tamlander, A Vähäniemi, E Löyttyniemi, T Suominen, M Välimäki
UNLABELLED: WHAT IS KNOWN ON THE SUBJECT?: Stigma related to mental illnesses is a great burden on societies globally. Factors associated with nurses' attitudes towards people with mental illness in health-care settings are discrepant. Stigmatized attitudes among staff members towards patients with mental illness have widely been studied in various specialized health care contexts, but less often in primary health-care settings. WHAT THIS PAPER ADDS TO THE EXISTING KNOWLEDGE?: Nurses' attitudes towards people with mental illness in general were positive in primary care health settings...
August 2016: Journal of Psychiatric and Mental Health Nursing
Rohit Abraham, Dinesh Vyas, Mayur Narayan, Arpita Vyas
Trauma-related injury in fast developing countries are linked to 90% of international mortality rates, which can be greatly reduced by improvements in often non-existent or non-centralized emergency medical systems (EMS)-particularly in the pre-hospital care phase. Traditional trauma training protocols-such as Advanced Trauma Life Support (ATLS), International Trauma Life Support (ITLS), and Basic Life Support (BLS)-have failed to produce an effective pre-hospital ground force of medical first responders. To overcome these barriers, we propose a new four-tiered set of trauma training protocols: Massive Open Online Course (MOOC) Trauma Training, Acute Trauma Training (ATT), Broad Trauma Training (BTT), and Cardiac and Trauma Training (CTT)...
December 2015: American Journal of Robotic Surgery
Timothy J Suchomel, Christopher J Sole
The force production characteristics of three weightlifting derivatives were examined by comparing the force-time curves of each exercise. Sixteen resistance-trained men performed repetitions of the hang power clean (HPC), jump shrug (JS), and hang high pull (HHP) on a force platform at several relative loads. Relative peak force (PFRel), relative impulse (IMPRel), peak rate of force development (PRFD), and time normalized force-time curves of each exercise were compared. The JS produced greater PFRel compared to the HPC (p < 0...
August 24, 2016: International Journal of Sports Physiology and Performance
Paola Contessa, Carlo J DeLuca, Joshua C Kline
Throughout the literature different observations of motor unit firing behavior during muscle fatigue have been reported and explained with varieties of conjectures. The disagreement amongst previous studies has resulted in part from the limited number of available motor units, and from the misleading practice of grouping motor unit data across different subjects, contractions, and force levels. To establish a more clear understanding of motor unit control during fatigue we investigated the firing behavior of motor units from the Vastus Lateralis muscle of individual subjects during a fatigue protocol of repeated voluntary constant-force isometric contractions...
July 6, 2016: Journal of Neurophysiology
Gregory C Bogdanis, Olga Kaloheri, Athanasios Tsoukos, Gerasimos Terzis, Panagiotis Veligekas
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Julius Fink, Naoki Kikuchi, Shou Yoshida, Kentaro Terada, Koichi Nakazato
BACKGROUND: In this study, we investigated the effects of resistance training protocols with different loads on muscle hypertrophy and strength. METHODS: Twenty-one participants were randomly assigned to 1 of 3 (n = 7 for each) resistance training (RT) protocols to failure: High load 80 % 1RM (8-12 repetitions) (H group), low load 30 % 1RM (30-40 repetitions) (L group) and a mixed RT protocol (M group) in which the participants switch from H to L every 2 weeks...
2016: SpringerPlus
Runar Unhjem, Mona Nygård, Lene T van den Hoven, Simranjit K Sidhu, Jan Hoff, Eivind Wang
Recently, we documented age-related attenuation of efferent drive to contracting skeletal muscle. It remains elusive if this indication of reduced muscle strength is present with lifelong strength training. For this purpose, we examined evoked potentials in the calf muscles of 11 [71 ± 4 (SD) yr] strength-trained master athletes (MA) contrasted with 10 (71 ± 4 yr) sedentary (SO) and 11 (73 ± 6 yr) recreationally active (AO) old subjects, as well as 9 (22 ± 2 yr) young controls. As expected, MA had higher leg press maximal strength (MA, 185 ± 32 kg; AO, 128 ± 15 kg; SO, 106 ± 11 kg; young, 147 ± 22 kg, P < 0...
August 1, 2016: Journal of Applied Physiology
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