41. Limbic and fronto-cortical influence on the control of the maximum force

2009 ◽  
Vol 120 (1) ◽  
pp. e20
Author(s):  
M. Al Qawasmeh ◽  
W. Hermann ◽  
P. Günther ◽  
P. Baum
Keyword(s):  
Maximum Force ◽  
Cortical Influence

Limbic and fronto-cortical influence on the control of the maximum Force

2008 ◽  
Vol 39 (01) ◽  
Author(s):  
M Al Qawasmeh ◽  
W Hermann ◽  
P Günther ◽  
P Baum
Keyword(s):  
Maximum Force ◽  
Cortical Influence

scholarly journals Effect of Tai Chi Training on Plantar Loads during Walking in Individuals with Knee Osteoarthritis

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Zhiwang Zhang ◽  
Lingyan Huang ◽  
Yu Liu ◽  
Lin Wang
Keyword(s):  
Clinical Trials ◽  
Knee Osteoarthritis ◽  
Education Program ◽  
Tai Chi ◽  
Peak Pressure ◽  
Maximum Force ◽  
Control Group ◽  
Link Type ◽  
Wellness Education ◽  
Metatarsophalangeal Joints

Tai Chi is an available method for the treatment of knee osteoarthritis (KOA). The impacts of Tai Chi on plantar loads of individuals with KOA are not fully understood. 46 participants with knee osteoarthritis were randomly assigned into the Tai Chi group (n=23) or the control group (n=23). The Tai Chi group attended a 6-month Tai Chi program, and the control group participated in a wellness education program. Novel Pedar-X system was used to collect the peak pressure (PP) and maximum force (MF) during walking before and 6 months after the intervention. Significant higher peak pressure and maximum force were observed in the 4th and 5th metatarsophalangeal joints in the Tai Chi group. However, there were significant declines in the peak pressure of the whole foot and the 2nd and 3rd metatarsophalangeal joints and maximum force of the heel in the control group. These results suggested that individuals with KOA might change the pattern of plantar loads during walking through Tai Chi, and plantar loads would be useful as a parameter to assess the effect of Tai Chi on knee osteoarthritis. This trial is registered with Clinical Trials: CHiCTR-TRC-13003264.

scholarly journals The effects of 12 weeks of static stretch training on the functional, mechanical, and architectural characteristics of the triceps surae muscle–tendon complex

2021 ◽  
Author(s):  
Stefano Longo ◽  
Emiliano Cè ◽  
Angela Valentina Bisconti ◽  
Susanna Rampichini ◽  
Christian Doria ◽  
...  
Keyword(s):  
Muscle Activation ◽  
Maximum Voluntary Contraction ◽  
Muscle Stiffness ◽  
Triceps Surae ◽  
Maximum Force ◽  
Passive Stiffness ◽  
Electromechanical Delay ◽  
Fascicle Length ◽  
Generating Capacity ◽  
Plantarflexor Muscles

Abstract Purpose We investigated the effects of 12 weeks of passive static stretching training (PST) on force-generating capacity, passive stiffness, muscle architecture of plantarflexor muscles. Methods Thirty healthy adults participated in the study. Fifteen participants (STR, 6 women, 9 men) underwent 12-week plantarflexor muscles PST [(5 × 45 s-on/15 s-off) × 2exercises] × 5times/week (duration: 2250 s/week), while 15 participants (CTRL, 6 women, 9 men) served as control (no PST). Range of motion (ROM), maximum passive resistive torque (PRTmax), triceps surae architecture [fascicle length, fascicle angle, and thickness], passive stiffness [muscle–tendon complex (MTC) and muscle stiffness], and plantarflexors maximun force-generating capacity variables (maximum voluntary contraction, maximum muscle activation, rate of torque development, electromechanical delay) were calculated Pre, at the 6th (Wk6), and the 12th week (Wk12) of the protocol in both groups. Results Compared to Pre, STR ROM increased (P < 0.05) at Wk6 (8%) and Wk12 (23%). PRTmax increased at Wk12 (30%, P < 0.05), while MTC stiffness decreased (16%, P < 0.05). Muscle stiffness decreased (P < 0.05) at Wk6 (11%) and Wk12 (16%). No changes in triceps surae architecture and plantarflexors maximum force-generating capacity variables were found in STR (P > 0.05). Percentage changes in ROM correlated with percentage changes in PRTmax (ρ = 0.62, P = 0.01) and MTC stiffness (ρ = − 0.78, P = 0.001). In CTRL, no changes (P > 0.05) occurred in any variables at any time point. Conclusion The expected long-term PST-induced changes in ROM were associated with modifications in the whole passive mechanical properties of the ankle joint, while maximum force-generating capacity characteristics were preserved. 12 weeks of PST do not seem a sufficient stimulus to induce triceps surae architectural changes.

Variation in kinematics and dynamics of the landing flights of pigeons on a novel perch

1998 ◽  
Vol 201 (24) ◽  
pp. 3309-3316 ◽  
Author(s):  
P. R. Green ◽  
P. Cheng
Keyword(s):  
Body Weight ◽  
Kinetic Energy ◽  
Horizontal Velocity ◽  
Maximum Force ◽  
Kinematics And Dynamics ◽  
Video Recordings

Pigeons made 10 flights to a novel perch. Kinematic measurements of these flights were obtained from video recordings, and the forces exerted on the perch on each landing were measured. There was wide variation(20-fold range) in the kinetic energy of the pigeons just before landing,arising almost entirely from variation in horizontal velocity. The maximum force exerted on the perch varied in magnitude from approximately twice to eight times the pigeons' body weight, and in direction from 40 to 90 below the horizontal. In landings with high final kinetic energy, the maximum force exerted on the perch was larger and was applied at a shallower angle than in those with low final kinetic energy. Landing flights with high final kinetic energy showed straighter trajectories and a larger peak deceleration during the last 300 ms of approach flight than those with low final kinetic energy, which had downward-curving trajectories and a more prolonged and steady pattern of deceleration. Mean final kinetic energy was lower in the first two landings made on the perch than in subsequent landings, indicating that pigeons are more likely to adopt a slow,downward-curving approach to a novel perch and a fast, straight approach to a familiar one.

scholarly journals Applied Force during Piston Prosthesis Placement in a 3D-Printed Model: Freehand vs Robot-Assisted Techniques

2018 ◽  
Vol 160 (2) ◽  
pp. 320-325 ◽  
Author(s):  
Christopher R. Razavi ◽  
Paul R. Wilkening ◽  
Rui Yin ◽  
Nicolas Lamaison ◽  
Russell H. Taylor ◽  
...  
Keyword(s):  
Middle Ear ◽  
Force Sensor ◽  
Neck Surgery ◽  
Maximum Force ◽  
Maximum Magnitude ◽  
Robot Assisted ◽  
Freehand Technique ◽  
Stapes Prosthesis ◽  
3D Printed ◽  
The Mean

Objectives To describe a 3D-printed middle ear model that quantifies the force applied to the modeled incus. To compare the forces applied during placement and crimping of a stapes prosthesis between the Robotic ENT Microsurgery System ( REMS) and the freehand technique in this model. Study Design Prospective feasibility study. Setting Robotics laboratory. Subjects and Methods A middle ear model was designed and 3D printed to facilitate placement and crimping of a piston prosthesis. The modeled incus was mounted to a 6–degree of freedom force sensor to measure forces/torques applied on the incus. Six participants—1 fellowship-trained neurotologist, 2 neurotology fellows, and 3 otolaryngology–head and neck surgery residents—placed and crimped a piston prosthesis in this model, 3 times freehand and 3 times REMS assisted. Maximum force applied to the incus was then calculated for prosthesis placement and crimping from force/torque sensor readings for each trial. Robotic and freehand outcomes were compared with a linear regression model. Results Mean maximum magnitude of force during prosthesis placement was 126.4 ± 73.6 mN and 105.0 ± 69.4 mN for the freehand and robotic techniques, respectively ( P = .404). For prosthesis crimping, the mean maximum magnitude of force was 469.3 ± 225.2 mN for the freehand technique and 272.7 ± 97.4 mN for the robotic technique ( P = .049). Conclusions Preliminary data demonstrate that REMS-assisted stapes prosthesis placement and crimping are feasible with a significant reduction in maximum force applied to the incus during crimping with the REMS in comparison with freehand.

On Wave Force Coefficient Variability

1987 ◽  
Vol 109 (4) ◽  
pp. 295-306 ◽  
Author(s):  
J. H. Nath
Keyword(s):  
Phase Angle ◽  
Vortex Shedding ◽  
Vertical Cylinder ◽  
Wave Force ◽  
Maximum Force ◽  
Periodic Waves ◽  
Force Coefficient ◽  
Ambient Flow ◽  
Smooth Cylinder ◽  
Phase Differences

Wave force coefficient variability for cylinders, from wave to wave in a train of periodic waves, has been shown to be dependent on the phase of the force record relative to the ambient flow. The phase varies due to vortex shedding, but the maximum force is approximately constant as seen from this work and the work of other investigators. Thus, the maximum force coefficient is tightly organized according to the Keulegan-Carpenter number and scatter is seen in the phase angle versus Keulegan-Carpenter number. On the other hand, both Cd and Cm have scatter due to these phase differences from wave to wave. For unknown reasons, even when averaged over several wave cycles there is scatter in the results for Cd and Cm. This investigation shows that the maximum force coefficients for a heavily roughened vertical cylinder are tightly arranged according to the Keulegan-Carpenter number and the period parameter. Furthermore, the phase angle is similarly much more organized than for the smooth cylinder.

scholarly journals ANALYSIS OF BIOMECHANICAL PARAMETERS IN COLONIC ANASTOMOSIS

2016 ◽  
Vol 29 (2) ◽  
pp. 90-92 ◽  
Author(s):  
Tiago Cavalcanti IWANAGA ◽  
José Lamartine de Andrade AGUIAR ◽  
Euclides Dias MARTINS-FILHO ◽  
Flávio KREIMER ◽  
Fernando Luiz SILVA-FILHO ◽  
...  
Keyword(s):  
Modulus Of Elasticity ◽  
Treatment Time ◽  
Intestinal Wall ◽  
Maximum Force ◽  
Sugarcane Molasses ◽  
Rupture Force ◽  
Treatment Groups ◽  
Biomechanical Parameters ◽  
Medical Interest

ABSTRACT Background: The use of measures in colonic anastomoses to prevent dehiscences is of great medical interest. Sugarcane molasses, which has adequate tolerability and compatibility in vivo, has not yet been tested for this purpose. Aim: To analyze the biomechanical parameters of colonic suture in rats undergoing colectomy, using sugarcane molasses polysaccharide as tape or gel. Methods: 45 Wistar rats (Rattus norvegicus albinus) were randomized into three groups of 15 animals: irrigation of enteric sutures with 0.9% saline solution; application of sugarcane molasses polysaccharide as tape; and sugarcane molasses polysaccharide as gel. The rats underwent colon ressection, with subsequent reanastomosis using polypropylene suture; they were treated according to their respective groups. Five rats from each group were evaluated at different times after the procedure: 30, 90 and 180 days postoperatively. The following variables were evaluated: maximum rupture force, modulus of elasticity and specific deformation of maximum force. Results: The biomechanical variables among the scheduled times and treatment groups were statistically calculated. The characteristics of maximum rupture force and modulus of elasticity of the specimens remained identical, regardless of treatment with saline, polysaccharide gel or tape, and treatment time. However, it was found that the specific deformation of maximum force of the intestinal wall was higher after 180 days in the group treated with sugarcane polysaccharide gel (p=0.09). Conclusion: Compared to control, it was detected greater elasticity of the intestinal wall in mice treated with sugarcane polysaccharide gel, without changing other biomechanical characteristics, regardless of type or time of treatment.

Autonomy facilitates repeated maximum force productions

2017 ◽  
Vol 55 ◽  
pp. 264-268 ◽  
Author(s):  
Takehiro Iwatsuki ◽  
Reza Abdollahipour ◽  
Rudolf Psotta ◽  
Rebecca Lewthwaite ◽  
Gabriele Wulf
Keyword(s):  
Maximum Force
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