Muscle Stiffness Estimation Using Center of Pressure Fluctuations Induced by Electrical Stimulation

2018 ◽  
pp. 569-572 ◽  
Author(s):  
Takanori Uchiyama ◽  
Ayana Sugiyama
Keyword(s):  
Electrical Stimulation ◽  
Center Of Pressure ◽  
Pressure Fluctuations ◽  
Muscle Stiffness

scholarly journals Can Muscle Stiffness Alone Stabilize Upright Standing?

1999 ◽  
Vol 82 (3) ◽  
pp. 1622-1626 ◽  
Author(s):  
Pietro G. Morasso ◽  
Marco Schieppati
Keyword(s):  
Center Of Pressure ◽  
Center Of Mass ◽  
Muscle Stiffness ◽  
The Body ◽  
Ankle Muscles ◽  
Upright Standing ◽  
Stiffness Control ◽  
Control Patterns ◽  
Physiological Values

A stiffness control model for the stabilization of sway has been proposed recently. This paper discusses two inadequacies of the model: modeling and empiric consistency. First, we show that the in-phase relation between the trajectories of the center of pressure and the center of mass is determined by physics, not by control patterns. Second, we show that physiological values of stiffness of the ankle muscles are insufficient to stabilize the body “inverted pendulum.” The evidence of active mechanisms of sway stabilization is reviewed, pointing out the potentially crucial role of foot skin and muscle receptors.

Effect of adding neuromuscular electrical stimulation training to pulmonary rehabilitation in patients with chronic obstructive pulmonary disease: randomized clinical trial

2018 ◽  
Vol 33 (2) ◽  
pp. 195-206 ◽  
Author(s):  
Marwa Mekki ◽  
Thierry Paillard ◽  
Sonia Sahli ◽  
Zouhair Tabka ◽  
Yassine Trabelsi
Keyword(s):  
Electrical Stimulation ◽  
Pulmonary Rehabilitation ◽  
Center Of Pressure ◽  
Intervention Group ◽  
Neuromuscular Electrical Stimulation ◽  
Berg Balance Scale ◽  
Voluntary Contraction ◽  
Control Group ◽  
Chronic Obstructive ◽  
Obstructive Pulmonary Disease

Objective: To investigate the effectiveness of neuromuscular electrical stimulation added to pulmonary rehabilitation on walking tolerance and balance in patients with chronic obstructive pulmonary disease (COPD). Design: Randomized clinical trial. Setting: Outpatient, Faculty of Medicine of Sousse, Tunisia. Subjects: A total of 45 patients with COPD were assigned to an intervention group ( n = 25) or a control group ( n = 20). Interventions: The intervention group underwent a neuromuscular electrical stimulation added to pulmonary rehabilitation, and the control group underwent only a pulmonary rehabilitation, three times per week during six months. Main Measures: Measures were taken at baseline and after six months of training. A stabilometric platform, time up and go, Berg balance scale tests, 6 minute walking test, and the maximal voluntary contraction were measured. Results: In the intervention group, an increase in an exercise tolerance manifested by a longer distance walked in 6 minute walking test 619.5 (39.6) m was observed in comparison to the control group 576.3 (31.5) m. The values of the time up and go, Berg balance scale, and maximal voluntary contraction in the intervention group at follow-up were significantly higher than those in the control group ( P  = 0.02, P  = 0.01, P  = 0.0002, respectively). The center of pressure in the mediolateral and in the anteroposterior directions, as well as the center of pressure area was significantly more improved in open eyes and closed eyes in the intervention group compared to the control group ( P < 0.001). Conclusion: The neuromuscular electrical stimulation added to pulmonary rehabilitation group benefited from better walking tolerance and greater balance improvement than the only pulmonary rehabilitation.

The Amount and Temporal Structure of Center of Pressure Fluctuations During Quiet Standing in Patients With Chronic Low Back Pain

Motor Control ◽  
2020 ◽  
Vol 24 (1) ◽  
pp. 91-112
Author(s):  
Fatemeh Azadinia ◽  
Ismail Ebrahimi-Takamjani ◽  
Mojtaba Kamyab ◽  
Morteza Asgari ◽  
Mohamad Parnianpour
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Chronic Low Back Pain ◽  
Healthy Subjects ◽  
Postural Sway ◽  
Center Of Pressure ◽  
Pressure Fluctuations ◽  
Quiet Standing ◽  
Low Back ◽  
Nonlinear Parameters

The characteristics of postural sway were assessed in quiet standing under three different postural task conditions in 14 patients with nonspecific chronic low back pain and 12 healthy subjects using linear and nonlinear center of pressure parameters. The linear parameters consisted of area, the mean total velocity, sway amplitude, the SD of velocity, and the phase plane portrait. The nonlinear parameters included the Lyapunov exponent, sample entropy, and the correlation dimension. The results showed that the amount of postural sway was higher in the patients with low back pain compared with the healthy subjects. Assessing the nonlinear parameters of the center of pressure showed a lower sample entropy and a higher correlation dimension in the patients with low back pain compared with the healthy subjects. The results of this study demonstrate the greater regularity and higher dimensionality of the center of pressure fluctuations in patients with nonspecific chronic low back pain, which suggests that these patients adopt different postural control strategies to maintain an upright stance.

Dynamical structure of center of pressure fluctuations in elderly people

2009 ◽  
Vol 30 (2) ◽  
pp. 223-226 ◽  
Author(s):  
Benoît Seigle ◽  
Sofiane Ramdani ◽  
Pierre Louis Bernard
Keyword(s):  
Elderly People ◽  
Center Of Pressure ◽  
Pressure Fluctuations ◽  
Dynamical Structure

scholarly journals The Effects of National Academy of Sports Medicine and Sahrmann Training on Foot Pressure Distribution in Flexed Posture Students

2021 ◽  
Vol 19 (1) ◽  
pp. 99-100
Author(s):  
Karim Mohammad Jabbar1 ◽  
◽  
Farzaneh Gandomi ◽  
Keyword(s):  
Standard Deviation ◽  
Pressure Distribution ◽  
Sports Medicine ◽  
Center Of Pressure ◽  
Muscle Stiffness ◽  
Analysis Of Covariance ◽  
Foot Pressure ◽  
Symmetry Index ◽  
Significant Difference ◽  
Axis Length

Objectives: Flexed posture with Hyperkyphosis (HKP) and Forward Head Posture (FHP), due to changes in the spine alignment, lead to the displacement of the center of pressure and increased postural sways; ultimately, this condition disrupts the distribution of foot pressure. Therefore, the present study aimed to compare the effects of 8 weeks of National Academy of Sports Medicine (NASM) and Sharman training on Foot Pressure Distribution (FPD) in flexed posture students. Methods: In this double-blind randomized clinical trial, 30 students with HKP and FHP were randomly assigned in two groups of NASM and Sahrmann (n=15/group). The angle of HKP and FHP were evaluated by Spinal Mouse and Image J software. FPD was also assessed by a Payatek foot scaner (PT-scan) device. The obtained data were analyzed in SPSS using one-way Analysis of Covariance (ANCOVA). Results: The present research results suggested that both intervention groups presented significant differences in reducing the angle of HKP (P<0.001) and FHP (P<0.001), COP minor axis length (P<0.05), COP major axis length (P<0.001), COP path length (P<0.001), the standard deviation of internal-external sways (P<0.001), and standard deviation of anterior-posterior sways (P<0.001); however, t there was no significant difference concerning the COP area (P>0.05) and symmetry index between the two legs (P>0.05). Discussion: Both provided corrective exercises reduced HKP and FHP angles and reduced postural sways. However, Sahrmann intervention with adjusted muscle stiffness and reduced electromechanical latency was more effective than NASM exercises in improving postural control and foot pressure symmetry index.

scholarly journals Trunk muscle co-activation using functional electrical stimulation modifies center of pressure fluctuations during quiet sitting by increasing trunk stiffness

2021 ◽  
Author(s):  
Matija Milosevic ◽  
Kei Masani ◽  
Noel Wu ◽  
Kristiina M. V. McConville ◽  
Milos R. Popovic
Keyword(s):  
Experimental Study ◽  
Electrical Stimulation ◽  
Simulation Study ◽  
Center Of Pressure ◽  
The Body ◽  
Trunk Muscles ◽  
Analytical Simulation ◽  
Co Activation ◽  
The Mean ◽  
Quiet Sitting

Background The purpose of this study was to examine the impact of functional electrical stimulation (FES) induced co-activation of trunk muscles during quiet sitting. We hypothesized that FES applied to the trunk muscles will increase trunk stiffness. The objectives of this study were to: 1) compare the center of pressure (COP) fluctuations during unsupported and FES-assisted quiet sitting - an experimental study and; 2) investigate how FES influences sitting balance - an analytical (simulation) study. Methods The experimental study involved 15 able-bodied individuals who were seated on an instrumented chair. During the experiment, COP of the body projected on the seating surface was calculated to compare sitting stability of participants during unsupported and FES-assisted quiet sitting. The analytical (simulation) study examined dynamics of quiet sitting using an inverted pendulum model, representing the body, and a proportional-derivative (PD) controller, representing the central nervous system control. This model was used to analyze the relationship between increased trunk stiffness and COP fluctuations. Results In the experimental study, the COP fluctuations showed that: i) the mean velocity, mean frequency and the power frequency were higher during FES-assisted sitting; ii) the frequency dispersion for anterior-posterior fluctuations was smaller during FES-assisted sitting; and iii) the mean distance, range and centroidal frequency did not change during FES-assisted sitting. The analytical (simulation) study showed that increased mechanical stiffness of the trunk had the same effect on COP fluctuations as the FES. Conclusions The results of this study suggest that FES applied to the key trunk muscles increases the speed of the COP fluctuations by increasing the trunk stiffness during quiet sitting.

Functional Electrical Stimulation‐Induced Surface Muscle Stiffness Captured by Computer‐Controlled Tonometry

2002 ◽  
Vol 26 (3) ◽  
pp. 244-247 ◽  
Author(s):  
Dietmar Rafolt ◽  
Eugen Gallasch ◽  
Martin Fend ◽  
Manfred Bijak ◽  
Hermann Lanmüller ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Functional Electrical Stimulation ◽  
Muscle Stiffness ◽  
Computer Controlled
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