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rate of force development training

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https://www.readbyqxmd.com/read/28291764/delayed-effects-of-a-low-volume-power-type-resistance-exercise-session-on-explosive-performance
#1
Athanasios Tsoukos, Panagiotis Veligekas, Lee E Brown, Gerasimos Terzis, Gregory C Bogdanis
This study examined the delayed effects of a power type training session on explosive performance. Seventeen well-trained male power and team sport athletes (age: 22.7±5.5 y, height: 181±8 cm, body mass: 80.7±8.6 kg, body fat: 9.2±1.7 %, 1-RM half-squat: 163±29 kg) performed four sessions (2 experimental and 2 control) one week apart in a randomized and counterbalanced order. Explosive performance was assessed before, 24 and 48 h following a low-volume, power-type training session (5 x 4 jump squats at 40% 1RM with 3 min rest), as well as before and after 24 and 48 h of rest (control)...
January 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28290931/prophylactic-ankle-bracing-in-military-settings-a-review-of-the-literature
#2
Thomas M Newman, Michael R Gay, W E Buckley
BACKGROUND: Within athletics and the military, ankle sprains are one of the most common injuries with the potential for long-term functional deficits. Incidence rates for ankle sprains within the military are one of the leading causes of limited duty days, especially during basic combat training, parachute training exercises, and in cadet populations. In 2008, the Department of Defense U.S. Army Center for Health Promotion and Preventative Medicine report recommended that military personnel should wear semirigid ankle braces during parachuting, basketball, soccer, and other similar high-risk activities to reduce ankle sprain injuries...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28281112/performance-of-kymerax%C3%A2-precision-drive-articulating-surgical-system-compared-to-conventional-laparoscopic-instruments-in-a-pelvitrainer-model
#3
Marco Alain Sieber, Bernhard Fellmann-Fischer, Michael Mueller
BACKGROUND: The Kymerax© Precision-Drive Articulating Surgical System by Terumo© is a handheld laparoscopic robot which permits motion in two additional degrees of freedom (deflection and rotation in the instrument tip). In a pelvitrainer model, we compared the performance of participants with different laparoscopic experiences and compared Kymerax© to conventional laparoscopic instruments. METHODS: 20 expert surgeons, performing more than 50 laparoscopic procedures per year, and 25 medical students without any experience in surgery at all were selected...
March 9, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28277422/neuromuscular-adaptations-to-short-term-high-intensity-interval-training-in-female-ice-hockey-players
#4
Juho-Ville Kinnunen, Harri Piitulainen, Jarmo M Piirainen
High-intensity interval training (HIIT) related neuromuscular adaptations, changes in force production and on-ice performance were investigated in female ice-hockey players during pre-season. Fourteen Finnish championship level ice hockey players (average age 22 ± 3 years) participated in 2½-week HIIT. Both spinal (H-reflex) and supraspinal (V-wave) neuromuscular responses of the soleus muscle were recorded before and after the training period. Static jump (SJ) and countermovement jump (CMJ) heights, plantar flexor maximal voluntary contraction (MVC) and rate of force development (RFD) were measured...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28269975/effects-of-detraining-on-neuromuscular-performance-in-a-selected-group-of-elite-women-pole-vaulters-a-case-study
#5
Irineu Loturco, Lucas A Pereira, Ronaldo Kobal, Henrique C Martins, Katia Kitamura, Cesar C Abad, Fabio Y Nakamura
The aim of this paper was to determine the effects of 28 days of inactivity on neuromuscular performance of elite women pole-vaulters. Four athletes undertook measurements of rate of force development (RFD), unloaded and loaded vertical jump tests, drop jumps and a 45 m sprint test before and after a transition period of planned inactivity. The RFD, the ability to accelerate over very short distances (5 m) and sprinting capacity improved after training cessation. Acceleration over longer distances (5-45 m) was impaired, while unloaded and loaded vertical jump tests suffered trivial to small changes...
April 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28263414/assessment-of-propulsive-pin-force-and-oar-angle-time-series-using-functional-data-analysis-in-on-water-rowing
#6
John Warmenhoven, Stephen Cobley, Conny Draper, Andrew Harrison, Norma Bargary, Richard Smith
The graphical presentation of the propulsive force applied at the pin plotted relative to the horizontal angle of the oar has been used practically in on-water rowing for the qualitative assessment of skill. How the pattern is related to performance variables has not been well identified, particularly for highly trained sculling athletes. Bivariate functional principal components analysis (bfPCA) was used on force-angle data to identify the main modes of variance in curves representing twenty seven female rowers of different competition levels (national and international level), rowing at 32 strokes per minute in a single scull boat...
March 6, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28240708/movement-patterns-and-muscle-damage-during-simulated-rugby-sevens-matches-in-national-team-players
#7
Lucas A Pereira, Fábio Y Nakamura, José E Moraes, Katia Kitamura, Solange P Ramos, Irineu Loturco
The aim of this study was to analyze the match performance (i.e., distance covered in different intensities), signs of muscle damage (assessed by means of creatine kinase [CK] activity and rate of force development [RFD]), and neuromuscular fatigue (using linear sprint and vertical jump performances) following three single-day simulated matches performed by rugby sevens players from the Brazilian National Team. Ten male rugby sevens players (25.2 ± 3.6 years; 88.7 ± 7.1 kg; 182.2 ± 6.3 cm) participated in this study...
February 23, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28223945/toward-respiratory-assessment-using-depth-measurements-from-a-time-of-flight-sensor
#8
Charles Sharp, Vahid Soleimani, Sion Hannuna, Massimo Camplani, Dima Damen, Jason Viner, Majid Mirmehdi, James W Dodd
Introduction: There is increasing interest in technologies that may enable remote monitoring of respiratory disease. Traditional methods for assessing respiratory function such as spirometry can be expensive and require specialist training to perform and interpret. Remote, non-contact tracking of chest wall movement has been explored in the past using structured light, accelerometers and impedance pneumography, but these have often been costly and clinical utility remains to be defined. We present data from a 3-Dimensional time-of-flight camera (found in gaming consoles) used to estimate chest volume during routine spirometry maneuvres...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28212963/clinician-reported-outcome-assessments-of-treatment-benefit-report-of-the-ispor-clinical-outcome-assessment-emerging-good-practices-task-force
#9
John H Powers, Donald L Patrick, Marc K Walton, Patrick Marquis, Stefan Cano, Jeremy Hobart, Maria Isaac, Spiros Vamvakas, Ashley Slagle, Elizabeth Molsen, Laurie B Burke
A clinician-reported outcome (ClinRO) assessment is a type of clinical outcome assessment (COA). ClinRO assessments, like all COAs (patient-reported, observer-reported, or performance outcome assessments), are used to 1) measure patients' health status and 2) define end points that can be interpreted as treatment benefits of medical interventions on how patients feel, function, or survive in clinical trials. Like other COAs, ClinRO assessments can be influenced by human choices, judgment, or motivation. A ClinRO assessment is conducted and reported by a trained health care professional and requires specialized professional training to evaluate the patient's health status...
January 2017: Value in Health: the Journal of the International Society for Pharmacoeconomics and Outcomes Research
https://www.readbyqxmd.com/read/28209802/doublet-stimulation-increases-ca-2-binding-to-troponin-c-to-ensure-rapid-force-development-in-skeletal-muscle
#10
Anthony J Bakker, Tanya R Cully, Catherine D Wingate, Christopher J Barclay, Bradley S Launikonis
Fast-twitch skeletal muscle fibers are often exposed to motor neuron double discharges (≥200 Hz), which markedly increase both the rate of contraction and the magnitude of the resulting force responses. However, the mechanism responsible for these effects is poorly understood, likely because of technical limitations in previous studies. In this study, we measured cytosolic Ca(2+) during doublet activation using the low-affinity indicator Mag-Fluo-4 at high temporal resolution and modeled the effects of doublet stimulation on sarcoplasmic reticulum (SR) Ca(2+) release, binding of Ca(2+) to cytosolic buffers, and force enhancement in fast-twitch fibers...
March 6, 2017: Journal of General Physiology
https://www.readbyqxmd.com/read/28194084/civil-construction-work-the-unseen-contributor-to-the-occupational-and-global-disease-burden
#11
R Sitalakshmi, P Saikumar, P Jeyachandran, Manoharan, Thangavel, Jayakar Thomas
BACKGROUND: Construction industry is the second largest employment giving industry in India with many semi-skilled or unskilled workers taking up the occupation for livelihood without any training and proper guidance. AIM: To evaluate the pathogenic association of cement exposure to occupational contact dermatoses as evidenced by immune markers and to correlate their pulmonary functions with years of exposure to cement. SETTING AND DESIGN: This was a cross-sectional study conducted among randomly selected cement workers...
May 2016: Indian Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28188061/evidence-based-guides-in-tracheostomy-use-in-critical-patients
#12
N Raimondi, M R Vial, J Calleja, A Quintero, A Cortés Alban, E Celis, C Pacheco, S Ugarte, J M Añón, G Hernández, E Vidal, G Chiappero, F Ríos, F Castilleja, A Matos, E Rodriguez, P Antoniazzi, J M Teles, C Dueñas, J Sinclair, L Martínez, I Von der Osten, J Vergara, E Jiménez, M Arroyo, C Rodriguez, J Torres, S Fernandez-Bussy, J L Nates
OBJECTIVES: Provide evidence based guidelines for tracheostomy in critically ill adult patients and identify areas needing further research. METHODS: A task force composed of representatives of 10 member countries of the Pan-American and Iberic Federation of Societies of Critical and Intensive Therapy Medicine and of the Latin American Critical Care Trial Investigators Network developed recommendations based on the Grading of Recommendations Assessment, Development and Evaluation system...
March 2017: Medicina Intensiva
https://www.readbyqxmd.com/read/28151781/acute-effects-of-eccentric-overload-on-concentric-front-squat-performance
#13
Cameron N Munger, David C Archer, Whitney D Leyva, Megan A Wong, Jared W Coburn, Pablo B Costa, Lee E Brown
Eccentric overload is used to enhance performance. The purpose of this study was to investigate the acute effects of eccentric overload on concentric front squat performance. Twenty resistance-trained males (age=23.80±1.82yrs, ht=176.95±5.21cm, mass=83.49±10.43kg, 1 Repetition Maximum [1RM] front squat=131.02±21.32kg) volunteered. A dynamic warm-up and warm-up sets of front squat were performed. Eccentric hooks were added to the barbell. They descended for 3 seconds, until eccentric hooks released, and performed the concentric phase as fast as possible...
January 30, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28149424/effect-of-8-weeks-of-free-weight-and-machine-based-strength-training-on-strength-and-power-performance
#14
Klaus Wirth, Michael Keiner, Hagen Hartmann, Andre Sander, Christoph Mickel
The aim of this study was to evaluate the effectiveness of free-weight and machine-based exercises to increase different strength and speed-strength variables. One hundred twenty male participants (age: 23.8 ± 2.5 years; body height: 181.0 ± 6.8 cm; body mass: 80.2 ± 8.9 kg) joined the study. The 2 experimental groups completed an 8 week periodized strength training program that included 2 training sessions per week. The exercises that were used in the strength training programs were the parallel barbell squat and the leg press...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149372/intramuscular-fiber-conduction-velocity-isometric-force-and-explosive-performance
#15
Spyridon Methenitis, Gerasimos Terzis, Nikolaos Zaras, Angeliki-Nikoletta Stasinaki, Nikolaos Karandreas
Conduction of electrical signals along the surface of muscle fibers is acknowledged as an essential neuromuscular component which is linked with muscle force production. However, it remains unclear whether muscle fiber conduction velocity (MFCV) is also linked with explosive performance. The aim of the present study was to investigate the relationship between vastus lateralis MFCV and countermovement jumping performance, the rate of force development and maximum isometric force. Fifteen moderately-trained young females performed countermovement jumps as well as an isometric leg press test in order to determine the rate of force development and maximum isometric force...
June 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28145919/chronic-effects-of-different-rest-intervals-between-sets-on-dynamic-and-isometric-muscle-strength-and-muscle-activity-in-trained-older-women
#16
José Claudio Jambassi Filho, André Luiz Demantova Gurjão, Marilia Ceccato, Alexandre Konig Garcia Prado, Luiza Herminia Gallo, Sebastião Gobbi
OBJECTIVE: This study investigated the chronic effects of different rest intervals (RIs) between sets on dynamic and isometric muscle strength and muscle activity. DESIGN: We used a repeated-measures design (pretraining and posttraining) with independent groups (different RI). Twenty-one resistance-trained older women (66.4 ± 4.4 years) were randomly assigned to either a 1-minute RI group (G-1 min; n = 10) or 3-minute RI group (G-3 min; n = 11). Both groups completed 3 supervised sessions per week during 8 weeks...
January 31, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28121802/delayed-effect-of-blood-flow-restricted-resistance-training-on-rapid-force-capacity
#17
Jakob Lindberg Nielsen, Ulrik Frandsen, Tatyana Prokhorova, Rune Dueholm Bech, Tobias Nygaard, Charlotte Suetta, Per Aagaard
PURPOSE: The aim of the present study was to investigate the effect and time course of high-frequent low-load resistance training with blood-flow restriction (BFR) on rapid force capacity (i.e. rate of torque development (RTD)). METHODS: Ten male subjects (22.8±2.3 years) performed four sets of knee extensor exercise (20%1RM) to concentric failure during concurrent BFR of the thigh (100mmHg), while eight work-matched controls (21.9±3.0 years) trained without BFR (CON)...
January 23, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28121227/reliability-of-a-new-medicine-ball-throw-power-test
#18
Mark G L Sayers, Stephen Bishop
The purpose of this study was to examine the reliability of a new upper body medicine ball push-press (MBP-P) test. Twenty-three strength trained volunteers performed a series of supine MBP-P throws using loads representing 5% and10% of their 5RM bench press (5 repetitions at each load). Throws were performed on a force platform (2000 Hz), with medicine ball kinematic data collected using a high-speed motion capture (500 Hz). Testing was repeated after 7-10 days to quantify inter-test reliability. Maximal force (Fmax), impulse at Fmax, time to Fmax, maximum rate of force development (RFDmax) were all calculated from the force platform outputs, with maximum ball velocity (Velmax) and maximum ball acceleration (Accelmax) developed from the kinematic data...
January 25, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28108648/reduced-firing-rates-of-high-threshold-motor-units-in-response-to-eccentric-overload
#19
Tom G Balshaw, Madhu Pahar, Ross Chesham, Lewis J Macgregor, Angus M Hunter
Acute responses of motor units were investigated during submaximal voluntary isometric tasks following eccentric overload (EO) and constant load (CL) knee extension resistance exercise. Ten healthy resistance-trained participants performed four experimental test sessions separated by 5 days over a 20 day period. Two sessions involved constant load and the other two used eccentric overload. EO and CL used both sessions for different target knee eccentric extension phases; one at 2 sec and the other at 4 sec...
January 2017: Physiological Reports
https://www.readbyqxmd.com/read/28098712/business-education-for-plastic-surgeons-a-systematic-review-development-and-implementation-of-a-business-principles-curriculum-in-a-residency-program
#20
Bahar Zarrabi, Karen K Burce, Stella M Seal, Scott D Lifchez, Richard J Redett, Kevin Frick, Amir H Dorafshar, Carisa M Cooney
BACKGROUND: Rising healthcare costs, decreasing reimbursement rates, and changes in American healthcare are forcing physicians to become increasingly business-minded. Both academic and private plastic surgeons can benefit from being educated in business principles. We conducted a systematic review to identify existing business curricula and integrated a business principles curriculum into residency training. METHODS: We anonymously surveyed our department regarding perceived importance of business principles and performed a systematic literature review from 1993-2013 using PubMed and Embase to identify residency training programs that had designed/implemented business curricula...
January 13, 2017: Plastic and Reconstructive Surgery
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