Article
Acoustics
Unggul Wasiwitono, Arif Wahjudi, Ari K. Saputra, Yohanes
Summary: In this study, a control strategy using a control moment gyroscope as an actuator is proposed to stabilize the inverted pendulum at the upright unstable equilibrium point while maintaining the gimbal angle as small as possible. The effectiveness of the proposed state-feedback control strategy is evaluated through simulation for both linear and nonlinear cases. It is shown that the controller effectively stabilizes the inverted pendulum.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Medicine, General & Internal
Nebojsa Trajkovic, Darjan Smajla, Ziga Kozinc, Nejc Sarabon
Summary: This study aimed to investigate the differences in postural stability among highly trained adolescents and young adult athletes based on sex and sport. The results showed significant interactions between sex and sport regarding postural stability. There was also a significant main effect of sport on postural stability. These findings suggest that optimal postural strategies for elite athletes may vary depending on the specific sport they participate in.
JOURNAL OF CLINICAL MEDICINE
(2022)
Article
Thermodynamics
Hussam K. Abdul-Ameer
Summary: This paper proposes a new approach to model and analyze erect posture by using a spherical inverted pendulum. The torque components in two oscillation directions were estimated using stabilometric data, and their effects on rejecting intrinsic perturbation and segregating foot deformities were investigated. The results showed that the torque components in direction ? can reject intrinsic perturbation, and the component in direction f is feasible for segregating foot deformities.
ADVANCES IN MECHANICAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Nebojsa Trajkovic, Ziga Kozinc, Darjan Smajla, Nejc Sarabon
Summary: This study aimed to determine the relationship between ankle strength and range of motion with postural balance in single-leg stance in trained athletes. Ankle RoM showed the greatest influence on CoP variables in the ML direction.
SCIENTIFIC REPORTS
(2021)
Article
Neurosciences
Nejc Sarabon, Ziga Kozinc, Goran Markovic
Summary: This study reveals that age and sex have task- and sex-specific effects on postural sway. Researchers and clinicians should consider these effects when comparing groups or monitoring changes over time.
Article
Neurosciences
Hui Lyu, Yong Fan, Anke Hua, Xueying Cao, Ying Gao, Jian Wang
Summary: The study found that both unilateral and bilateral fatiguing exercises led to increased sway velocity and total displacements, while bilateral fatiguing exercises resulted in early anticipatory onset of TrA/IO and increased co-activation index of the TrA/IO-LMF muscle pair during the CPAs phase. The results suggest that repetitive unilateral or bilateral fatiguing exercises may differently affect the anticipatory component of postural control.
HUMAN MOVEMENT SCIENCE
(2022)
Article
Engineering, Mechanical
Song Liang, Zaihua Wang, Gabor Stepan
Summary: This paper investigates the impact of rolling resistance on the control performance and dynamics of Two-Wheeled Inverted Pendulums (TWIPs) and proposes new design methods for angle, velocity, and position control. The effectiveness of these new designs is validated through theoretical analysis and numerical simulations.
NONLINEAR DYNAMICS
(2021)
Article
Rehabilitation
L. Labanca, M. Ghislieri, M. Knaflitz, G. Barone, L. Bragonzoni, V Agostini, M. G. Benedetti
Summary: The study found that in healthy young individuals, single-limb stance is characterized by four major muscle synergies, both in open- and closed-eyes conditions. Future research should investigate muscle synergies in participants of different age groups and pathological conditions.
BMC SPORTS SCIENCE MEDICINE AND REHABILITATION
(2021)
Article
Physiology
Dasa Gorjan, Nejc Sarabon, Jan Babic
Summary: Understanding the relation between the motion of the center of mass (COM) and the center of pressure (COP) is crucial for understanding how the body maintains equilibrium. Stabilizing the COM without constraining joint movements using an external stabilization method revealed significant variability in inter-individual postural control. Studying the postural parameters of quiet standing before the external stabilization did not explain the individual differences in postural responses.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Engineering, Chemical
Zhuang-Zhuang Xin, Jia-Jun Wang
Summary: X-Z IP is a complex nonlinear system that is difficult to control using traditional linear control theories. The underactuated nature of the pendulum adds complexity to control design.
Article
Robotics
Kyu-Chur Han, Jung-Yup Kim
Summary: This paper presents a posture stabilization algorithm for a quadruped robot that can respond to changes in slope caused by irregular ground obstacles and unexpected impacts during walking. The algorithm uses a cart-inverted pendulum model with double-input double-output (DIDO) to generate vertical and horizontal ground reaction forces on the robot's feet. A linear quadratic regulator (LQR) is used to generate stabilizing moment and stabilizing force for controlling the robot's inclinat ion and movement. The algorithm also adjusts the constraint conditions in the quadratic programming (QP) based on whether a foot is in contact with the ground to generate appropriate ground reaction forces. Furthermore, vertical speed control is implemented for the swing feet to ensure soft landing. The proposed algorithm is evaluated using GAZEBO simulation and compared with a previous inverted pendulum model-based algorithm.
INTELLIGENT SERVICE ROBOTICS
(2023)
Article
Computer Science, Information Systems
Arnaldo de Carvalho, Joao Francisco Justo, Bruno Augusto Angelico, Alexandre Manicoba de Oliveira, Joao Inacio da Silva Filho
Summary: Artificial neural networks have been widely used in various fields over the past few decades, but they may face challenges when dealing with uncertain situations. The family of paraconsistent logics, as a powerful tool for handling uncertainty and contradictory information, has attracted attention from researchers in the field of artificial intelligence.
Article
Computer Science, Information Systems
Yi-Jen Mon
Summary: This paper introduces the concept of intelligent control using Tikhonov regularization for nonlinear coupled systems. It explores the impact of Tikhonov regularization on these systems and aims to enhance intelligent control by determining the optimal regularization term and integrating it with other control methods. The proposed Tikhonov-tuned sliding neural network (TSN) controller ensures both stability and superior system performance. The results indicate that the proposed TSN methodologies are effective and feasible.
Article
Multidisciplinary Sciences
Sardor Israilov, Li Fu, Jesus Sanchez-Rodriguez, Franco Fusco, Guillaume Allibert, Christophe Raufaste, Mederic Argentina
Summary: Machine learning is a new paradigm in control theory, but often lacks intuition compared to classical model-based methods, especially for reinforcement learning. In this article, a general framework is proposed to reproduce successful experiments and simulations using the inverted pendulum as a benchmark. Two algorithms, basic Q-Learning and Deep Q-Networks (DQN), are introduced to provide a comprehensive understanding of the approach and its implementation on real systems.
Review
Neurosciences
Maria Pia Bucci, Philippe Villeneuve
Summary: This article reviews recent studies on postural control, specifically focusing on the role of foot and visual inputs in a static postural stance. The authors performed a search and synthesis of articles from electronic databases such as Scopus, Web of Science, EBSCO, PubMed, and ResearchGate published until 2021. The aim of this review is to provide reference values for future studies on postural control in both healthy individuals and patients, and to encourage the development of protocols that consider the specificity of different systems responsible for human balance control.
Article
Neurosciences
Talyene G. C. Correa, Stephanie V. S. Donato, Kaue C. A. Lima, Ronaldo Pereira, Mehmet Uygur, Paulo Barbosa de Freitas
Article
Neurosciences
Debora B. Carvalho, Sandra M. S. F. Freitas, Flavia A. D. Alencar, Maria Liliane Silva, Sandra R. Alouche
EXPERIMENTAL BRAIN RESEARCH
(2020)
Review
Clinical Neurology
Cintia C. G. Alonso, Fernanda G. Silva, Leonardo O. P. Costa, Sandra M. S. F. Freitas
Summary: Studies have shown that smell tests are able to distinguish PD patients from individuals with other neurological disorders, such as progressive supranuclear palsy and essential tremor, but not with idiopathic rapid eye movement sleep behavior disorder.
EXPERT REVIEW OF NEUROTHERAPEUTICS
(2021)
Article
Geriatrics & Gerontology
Leticia Pophal da Silva, Natalia Boneti Moreira, Paulo Barbosa de Freitas, Gleber Pereira, Andre Luiz Felix Rodacki
Summary: This study found that functional capacity significantly influences gait parameters in older adults, regardless of fall history. Older adults with high functional capacity performed better during walking, and spatiotemporal parameters were the main factors explaining gait variability.
Article
Neurosciences
Kaue C. A. Lima, Gabriela O. C. Santos, Stephanie S. V. Donato, Leandro Borges, Elaine Hatanaka, Paulo B. de Freitas
Summary: The coordination between grip and load force in dynamic manipulation tasks was not affected by diabetes, but grip force control was affected during static holding tasks. The relative safety margin was significantly lower in individuals with DPN compared to healthy controls and those without DPN.
HUMAN MOVEMENT SCIENCE
(2021)
Article
Orthopedics
Andreia Miana, Marianyi Paola, Marcos Duarte, Caio Nery, Marcio Freitas
Summary: Patients with advanced hallux rigidus may have limited range of motion in the first metatarsophalangeal joint during walking and higher pressure in the lateral metatarsal heads. However, their postural sway during quiet standing is not affected.
JOURNAL OF FOOT & ANKLE SURGERY
(2022)
Article
Neurosciences
Rafaela B. S. C. Garbus, Janina M. Prado-Rico, Alethea G. Nardini, Sandra M. S. F. Freitas
Summary: Training of arm reaching movements in standing has immediate effects on postural control for stroke survivors, with left stroke individuals showing greater improvements. More sessions may be required for right stroke survivors to achieve balance improvements.
JOURNAL OF STROKE & CEREBROVASCULAR DISEASES
(2021)
Article
Neurosciences
Rogerio Pessoto Hirata, Mikkel Jacobi Thomsen, Frederik Greve Larsen, Nicolai Stottrup, Marcos Duarte
Summary: The study showed that pain in the lower leg resulted in a decrease in postural sway area, an increase in velocity, frequency, and entropy. Completion of the secondary task reduced the effect of leg pain on postural sway.
HUMAN MOVEMENT SCIENCE
(2021)
Article
Rehabilitation
Cintia C. G. Alonso, Paulo B. de Freitas, Raquel S. Pires, Dalton L. De Oliveira, Sandra M. S. F. Freitas
Summary: This study compared the ability of different hand function tests to differentiate Parkinson's Disease (PD) patients from healthy controls, distinguish stages of the disease, and indicate changes over time. The results showed that the JTHFT(noW) test was highly accurate in discriminating hand function impairments in PD, while the 9HPT and some JTHFT subtests were sensitive to distinguish disease stages and progression.
PHYSIOTHERAPY THEORY AND PRACTICE
(2023)
Article
Multidisciplinary Sciences
Leonardo A. Afonseca, Renato N. Watanabe, Marcos Duarte
Summary: This study aimed to investigate the possible effects of the COVID-19 pandemic on long-distance running training. The analysis of running training records from athletes around the world revealed a decrease in the number of athletes, distance, and duration of running training in 2020 compared to 2019. There were significant variations in these variables throughout 2020, and running training in Brazil appeared to be the most affected by the pandemic and restriction measures.
Article
Rehabilitation
Heloise Borges, Sandra de Freitas, Richard Liebano, Sandra Alouche
Summary: Pain perception impairs aiming movements performed with the ipsilesional upper limb in individuals with unilateral chronic stroke, resulting in slower and less smooth trajectories, increased directional error, and decreased accuracy.
PHYSIOTHERAPY THEORY AND PRACTICE
(2022)
Article
Neurosciences
Paulo B. de Freitas, Sandra M. S. F. Freitas, Janina M. Prado-Rico, Mechelle M. Lewis, Guangwei Du, Jeff D. Yanosky, Xuemei Huang, Mark L. Latash
Summary: Motor synergies are affected by neurological conditions, and asymptomatic welders show impaired synergy controlling multi-finger actions. This impairment is associated with microstructural damage in the globus pallidus. Further analysis revealed that welding-related metal exposure affects posture-stabilizing synergy during a standing task, with higher brain iron and manganese content observed in welders.
Article
Nutrition & Dietetics
Gustavo Barquilha, Cesar Miguel Momesso Dos Santos, Kim Guimaraes Cacula, Vinicius Coneglian Santos, Tatiana Geraldo Polotow, Cristina Vardaris Vasconcellos, Jose Alberto Fernandes Gomes-Santos, Luiz Eduardo Rodrigues, Rafael Herling Lambertucci, Tamires Duarte Afonso Serdan, Adriana Cristina Levada-Pires, Elaine Hatanaka, Maria Fernanda Cury-Boaventura, Paulo Barbosa de Freitas, Tania Cristina Pithon-Curi, Laureane Nunes Masi, Marcelo Paes Barros, Rui Curi, Renata Gorjao, Sandro Massao Hirabara
Summary: In this study, the effects of fish oil supplementation combined with strength training on muscle damage induced by a single bout of exercise were investigated. The results showed that fish oil supplementation can alleviate muscle injury, inflammation, and redox imbalance, making it a beneficial strategy for young men intending to engage in strength training programs.
Article
Sport Sciences
Jamila Silva, Leandro Borges, Eleine Weimann, Beatriz Belmiro Dias, Flavio Gomes Faria, Beatriz Ferreira Salgado, Paulo de Freitas, Tania Cristina Pithon-Curi, Elaine Hatanaka
Summary: Prolonged wearing of high heels can lead to chronic injury and inflammation. This study investigated muscle injury, inflammation, and neutrophil function in young women after a single bout of stiletto dance class. The results showed that the class caused muscle damage but did not affect the plasma concentration of proinflammatory cytokines.
TRANSLATIONAL SPORTS MEDICINE
(2023)
Article
Neurosciences
John J. Buchanan, Alberto Cordova
Summary: Research has shown that spontaneous visual coupling supports frequency entrainment, phase attraction, and intermittent interpersonal coordination during the switch from a novision (NV) to vision (V) context among co-actors. The experiments demonstrate that similar self-paced frequencies result from same amplitude movements, while different amplitudes lead to disparate frequencies. In experiment 1, co-actors were instructed to maintain amplitude without explicit instructions for coordination, which limited frequency and phase entrainment in the V context. In experiment 2, co-actors were instructed to maintain amplitude and intentionally coordinate together, resulting in significant frequency modulations and the production of various stable relative phase patterns.
HUMAN MOVEMENT SCIENCE
(2024)
