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"Force-velocity"

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https://www.readbyqxmd.com/read/29669825/single-cardiac-ventricular-myosins-are-autonomous-motors
#1
Yihua Wang, Chen-Ching Yuan, Katarzyna Kazmierczak, Danuta Szczesna-Cordary, Thomas P Burghardt
Myosin transduces ATP free energy into mechanical work in muscle. Cardiac muscle has dynamically wide-ranging power demands on the motor as the muscle changes modes in a heartbeat from relaxation, via auxotonic shortening, to isometric contraction. The cardiac power output modulation mechanism is explored in vitro by assessing single cardiac myosin step-size selection versus load. Transgenic mice express human ventricular essential light chain (ELC) in wild- type (WT), or hypertrophic cardiomyopathy-linked mutant forms, A57G or E143K, in a background of mouse α-cardiac myosin heavy chain...
April 2018: Open Biology
https://www.readbyqxmd.com/read/29659583/a-modelling-approach-for-exploring-muscle-dynamics-during-cyclic-contractions
#2
Stephanie A Ross, Nilima Nigam, James M Wakeling
Hill-type muscle models are widely used within the field of biomechanics to predict and understand muscle behaviour, and are often essential where muscle forces cannot be directly measured. However, these models have limited accuracy, particularly during cyclic contractions at the submaximal levels of activation that typically occur during locomotion. To address this issue, recent studies have incorporated effects into Hill-type models that are oftentimes neglected, such as size-dependent, history-dependent, and activation-dependent effects...
April 16, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29570595/influence-of-a-cluster-set-configuration-on-the-adaptations-to-short-term-power-training
#3
Antonio J Morales-Artacho, Paulino Padial, Amador García-Ramos, Alejandro Pérez-Castilla, Belén Feriche
Morales-Artacho, AJ, Padial, P, García-Ramos, A, Pérez-Castilla, A, and Feriche, B. Influence of a cluster set configuration on the adaptations to short-term power training. J Strength Cond Res 32(4): 930-937, 2018-This study investigated the effects of a traditional (TT) vs. cluster (CT) resistance training on the lower-body force, velocity, and power output. Nineteen males were allocated to a CT or a TT group and took part of a 3-week resistance training (2 weekly sessions). CT involved 6 sets of 3 × 2 repetitions (30 seconds rest every 2 repetitions and 4 minutes 30 seconds between sets)...
April 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29567999/operating-length-and-velocity-of-human-vastus-lateralis-muscle-during-walking-and-running
#4
S Bohm, R Marzilger, F Mersmann, A Santuz, A Arampatzis
According to the force-length-velocity relationships, the muscle force potential during locomotion is determined by the operating fibre length and velocity. We measured fascicle and muscle-tendon unit length and velocity as well as the activity of the human vastus lateralis muscle (VL) during walking and running. Furthermore, we determined the VL force-length relationship experimentally and calculated the force-length and force-velocity potentials (i.e. fraction of maximum force according to the force-length-velocity curves) for both gaits...
March 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29567100/force-velocity-profiling-in-older-adults-an-adequate-tool-for-the-management-of-functional-trajectories-with-aging
#5
Julian Alcazar, Carlos Rodriguez-Lopez, I Ara, Ana Alfaro-Acha, Irene Rodríguez-Gómez, Roberto Navarro-Cruz, Jose Losa-Reyna, Francisco J García-García, Luis M Alegre
INTRODUCTION: The actual mechanisms leading to a reduced muscle power and functional ability in older adults are poorly understood. We investigated the association between different force-velocity (F-V) profiles and impaired muscle power, physical and cognitive function, frailty, and health-related quality of life (HRQoL) in older people. METHODS: Physical function (habitual gait speed, timed up-and-go test, sit-to-stand and stair-climbing ability), cognitive function, HRQoL and frailty were evaluated in 31 older subjects (70-85 years)...
March 19, 2018: Experimental Gerontology
https://www.readbyqxmd.com/read/29558255/comparison-of-different-regression-models-to-fit-the-force-velocity-relationship-of-a-knee-extension-exercise
#6
Eliseo Iglesias-Soler, Juan Fariñas, Xian Mayo, Luis Santos, Slobodan Jaric
The aims of this study were to compare the goodness of fit and the concurrent validity of three regression models of the force-velocity relationship in a unilateral knee extension exercise. The force-velocity relationship and the one-repetition-maximum load in the dominant and non-dominant leg were obtained in 24 male sports sciences students by a progressive protocol. Additionally, the maximum voluntary contraction (MVC) of the knee extensor muscles was recorded. Individual force-velocity relationships were obtained by the linear, quadratic polynomial and exponential regression models...
March 20, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29504934/mechanochemical-coupling-and-bi-phasic-force-velocity-dependence-in-the-ultra-fast-ring-atpase-spoiiie
#7
Ninning Liu, Gheorghe Chistol, Yuanbo Cui, Carlos Bustamante
Multi-subunit ring-shaped ATPases are molecular motors that harness chemical free energy to perform vital mechanical tasks such as polypeptide translocation, DNA unwinding, and chromosome segregation. Previously we reported the intersubunit coordination and stepping behavior of the hexameric ring-shaped ATPase SpoIIIE (Liu et al., 2015). Here we use optical tweezers to characterize the motor's mechanochemistry. Analysis of the motor response to external force at various nucleotide concentrations identifies phosphate release as the likely force-generating step...
March 5, 2018: ELife
https://www.readbyqxmd.com/read/29489715/force-velocity-relationship-in-three-different-variations-of-prone-row-exercises
#8
Irineu Loturco, Timothy Suchomel, Ronaldo Kobal, Ademir F S Arruda, Aristide Guerriero, Lucas A Pereira, Chi Nan Pai
This study examined the force-velocity relationship and tested the possibility of determining the relative loading intensity (% 1RM) in three different variations of prone row exercises. Thirty male top-level athletes from two different sports (National Team rugby union players and professional mixed martial arts fighters) were submitted to maximum dynamic strength assessments in the free prone bench pull, bent over barbell row, and bent over Smith-machine row, following standard procedures encompassing lifts performed from 40 to 100% of 1RM...
February 27, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29489712/using-load-velocity-relationships-to-predict-1rm-in-free-weight-exercise-a-comparison-of-the-different-methods
#9
Liam J Hughes, Harry G Banyard, Alasdair R Dempsey, Brendan R Scott
The purpose of this study was to investigate the reliability and validity of predicting 1-repetition maximum (1RM) in trained individuals using a load-velocity relationship. Twenty strength-trained men (age: 24.3±2.9 years, height: 180.1±5.9 cm, body mass: 84.2±10.5 kg) were recruited and visited the laboratory on three occasions. The load-velocity relationship was developed using the mean concentric velocity of repetitions performed at loads between 20% and 90% 1RM. Predicted 1RM was calculated using 3 different methods discussed in existing research; minimal velocity threshold 1RM (1RMMVT), load at zero velocity 1RM (1RMLD0) and force-velocity 1RM methods (1RMFV)...
February 27, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29474490/reproducibility-of-estimated-optimal-peak-output-using-a-force-velocity-test-on-a-cycle-ergometer
#10
Manuel J Coelho-E-Silva, Ricardo Rebelo-Gonçalves, Diogo Martinho, Alexis Ahmed, Leonardo G O Luz, João P Duarte, Vítor Severino, Rafael C Baptista, João Valente-Dos-Santos, Vasco Vaz, Rui S Gonçalves, Antonio Tessitore, António J Figueiredo
The current study aimed to examine the reproducibility of estimated peak power and estimated pedal velocity in a multi-trial 10-s all-out cycling test among adult athletes (n = 22; aged 23.50±4.73 years). Stature, sitting height and body mass were measured. Leg length was estimated as stature minus sitting height. Body volume was obtained from air displacement plethysmography and was subsequently used to calculate body density. Fat mass and fat-free mass were derived. The short-term power outputs were assessed from the force-velocity test (FVT), using a friction-braked ergometer on two separated occasions...
2018: PloS One
https://www.readbyqxmd.com/read/29466274/dissociated-time-course-of-recovery-between-strength-and-power-after-isoinertial-resistance-loading-in-rugby-union-players
#11
Rodney A Kennedy, David Drake
Kennedy, RA and Drake, D. Dissociated time course of recovery between strength and power after isoinertial resistance loading in rugby union players. J Strength Cond Res 32(3): 748-755, 2018-There is a substantial amount of research on the responses to isometric and eccentric loading. However, only a paucity of literature exists on the responses to isoinertial loading, especially in trained athletic populations using realistic loading protocols. The purpose of this study was to examine the acute neuromuscular response to a bout of isoinertial resistance loading in elite rugby players...
March 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29443085/mimicking-and-measuring-occlusal-erosive-tooth-wear-with-the-rub-roll-and-non-contact-profilometry
#12
Jan L Ruben, Gert-Jan Truin, Bas A C Loomans, Marie-Charlotte D N J M Huysmans
Chewing, drinking, and occasional tooth grinding will result in physiological tooth wear during a lifetime. Extreme challenges, such as bruxism or habitual chewing on foreign objects, may lead to excessive wear. Recently, the role of erosion in accelerating mechanical tooth wear has been recognized, but the interplay between chemical and mechanical wear processes has not been extensively studied. Our laboratory recently introduced a novel oral wear simulation device, the Rub&Roll, that enables the user to perform wear and loading studies separately or simultaneously in an erosive and/or abrasive environment...
February 2, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29391409/a-neuro-musculo-skeletal-model-for-insects-with-data-driven-optimization
#13
Shihui Guo, Juncong Lin, Toni Wöhrl, Minghong Liao
Simulating the locomotion of insects is beneficial to many areas such as experimental biology, computer animation and robotics. This work proposes a neuro-musculo-skeletal model, which integrates the biological inspirations from real insects and reproduces the gait pattern on virtual insects. The neural system is a network of spiking neurons, whose spiking patterns are controlled by the input currents. The spiking pattern provides a uniform representation of sensory information, high-level commands and control strategy...
February 1, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29370027/muscular-strength-is-associated-with-higher-intraocular-pressure-in-physically-active-males
#14
Jesús Vera, Raimundo Jiménez, Amador García-Ramos, David Cárdenas
SIGNIFICANCE: The positive association between intraocular pressure (IOP) and relative maximum force may have relevance for exercise recommendations when IOP is a concern. PURPOSE: The relationship between exercise and IOP has been approached in several studies. However, the influence of muscle function on IOP remains underexplored. This study aimed to determine the relationship between the maximal mechanical capabilities of muscles to generate force, velocity, and power with IOP...
February 2018: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/29361644/correction-relationship-between-force-velocity-profiles-and-1-500-m-ergometer-performance-in-young-rowers
#15
Caroline Giroux, Hugo Maciejewski, Amal Ben-Abdessamie, Frédéric Chorin, Julien Lardy, Sebastien Ratel, Abderrahmane Rahmani
No abstract text is available yet for this article.
November 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29357495/force-velocity-test-on-a-stationary-cycle-ergometer-methodological-recommendations
#16
Briar L Rudsits, Will G Hopkins, Christophe A Hautier, David M Rouffet
Force-velocity tests performed on stationary cycle ergometers are widely used to assess the torque- and power-generating capacities of the lower limbs. The aim of this study was to identify how testing and modeling procedures influence the assessment of individual torque-cadence and power-cadence relationships. Seventeen males completed 62 ± 16 pedal cycles from six 6-s all-out efforts interspersed with 5 min of rest. True measures of maximal power for a particular cadence were obtained for 24 ± 3 pedal cycles, while power was only 94 ± 3% of the true maximum in 19 ± 5 pedal cycles...
April 1, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29357487/the-effect-of-muscle-tendon-unit-vs-fascicle-analyses-on-vastus-lateralis-force-generating-capacity-during-constant-power-output-cycling-with-variable-cadence
#17
Scott F Brennan, Andrew G Cresswell, Dominic J Farris, Glen A Lichtwark
The maximum force-generating capacity of a muscle is dependent on the lengths and velocities of its contractile apparatus. Muscle-tendon unit (MTU) length changes can be estimated from joint kinematics; however, contractile element length changes are more difficult to predict during dynamic contractions. The aim of this study was to compare vastus lateralis (VL) MTU and fascicle level force-length and force-velocity relationships, and dynamic muscle function while cycling at a constant submaximal power output (2...
April 1, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29351163/comparison-of-the-force-velocity-and-power-time-curves-between-the-concentric-only-and-eccentric-concentric-bench-press-exercises
#18
Alejandro Pérez-Castilla, Paul Comfort, John J McMahon, Francisco Luis Pestaña-Melero, Amador García-Ramos
The aim of this study was to compare the temporal and mechanical variables between the concentric-only and eccentric-concentric bench press (BP) variants. Twenty-one men (age: 22.0±4.2 years, body mass: 73.4±7.7 kg, height: 177.2±8.0 cm; one-repetition maximum [1RM]: 1.12±0.12 kg⋅kg) were evaluated during the concentric-only and eccentric-concentric BP variants using 80% 1RM. Temporal (concentric phase duration, propulsive phase duration, and time to reach the maximum values of force, velocity, and power) and mechanical variables (force, velocity, and power), determined using a linear velocity transducer, were compared between both BP variants...
January 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29351161/effects-of-contrast-strength-vs-plyometric-training-on-lower-limb-explosive-performance-ability-to-change-direction-and-neuromuscular-adaptation-in-soccer-players
#19
Mehrez Hammami, Nawel Gaamouri, Roy J Shephard, Mohamed Souhaiel Chelly
The aim was to compare the effects of two differing 8-week in-season strength training programs (contrast strength training [CST] vs. plyometric training [PT]) on selected performance tests (5 and 40m sprints, S 4 X 5 m change of direction test, squat (SJ) and countermovement (CMJ) jumps , leg peak power on a cycle ergometer force-velocity test, 1-repetition maximal (1-RM) half squat, and electromyographic [EMG] activity of the vastus lateralis, vastus medialis and rectus femoris muscles during vertical jump tests)...
January 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29339982/relationships-between-mechanical-variables-in-the-traditional-and-close-grip-bench-press
#20
Robert G Lockie, Samuel J Callaghan, Matthew R Moreno, Fabrice G Risso, Tricia M Liu, Alyssa A Stage, Samantha A Birmingham-Babauta, John J Stokes, Dominic V Giuliano, Adrina Lazar, DeShaun L Davis, Ashley J Orjalo
The study aim was to determine relationships between mechanical variables in the one-repetition maximum (1RM) traditional bench press (TBP) and close-grip bench press (CGBP). Twenty resistance-trained men completed a TBP and CGBP 1RM. The TBP was performed with the preferred grip; the CGBP with a grip width of 95% biacromial distance. A linear position transducer measured: lift distance and duration; work; and peak and mean power, velocity, and force. Paired samples t-tests (p < 0.05) compared the 1RM and mechanical variables for the TBP and CGBP; effect sizes (d) were also calculated...
December 2017: Journal of Human Kinetics
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