Mass Displacement Research Articles

A Comparison of the Specific Facial Trauma Cases at the Department of Maxillofacial Surgery, Gdansk, Poland, from March 2019 to August 2023.

Background: Accidents involving the maxillofacial area are sudden and unforeseen, such as traffic accidents and physical altercations. The COVID-19 pandemic was a critical threat to the public in aspects not only involving physical health but also those affecting psychological health due to isolation, leading to a higher incidence of stress and depression among the general population and specifically in patients with OMF trauma. This study assessed the relationship between the impact of the COVID-19 pandemic and the quantity and severity of maxillofacial injuries. Methods: Data were retrieved from the Department of Maxillofacial Surgery of the University Clinical Centre in Gdansk from March 2019 to August 2023. Results: There was an increased risk of injury occurrence to the condylar process of the mandible, especially the left side, Le Fort type II/III fractures, injuries of the maxillary alveolar process, and displacement of the upper facial mass. Simultaneously, a decreased occurrence of certain injuries i.e., Le Fort type III fractures and Le Fort type I/II fractures, was recorded. Conclusions: The COVID-19 pandemic led to an increased occurrence of high-energy injuries, including displacement of the upper facial mass (p = 0.010).

Optimization and comparative analysis of an AISD suspension system with inerter element for enhanced ride and handling

This paper presents a comprehensive study on the modeling and optimization of an advanced suspension system, known as the Air Springs Inerter-Spring-Damper (AISD) system, incorporating an inerter element. A linear quarter car model is utilized to analyze the vibrational behavior of the AISD system when subjected to harmonic road disturbances. The steady-state response of the system is investigated by deriving the root mean square (RMS) values of the absolute relative displacement and acceleration of the sprung mass. To optimize the quarter car model, a criterion based on minimizing the absolute acceleration RMS while considering the relative displacement RMS is employed to calculate the inerter coefficient. The performance of the AISD suspension system is compared to that of both conventional quarter car systems and traditional air quarter car systems, with a focus on ride comfort and handling. The results demonstrate that the proposed AISD system outperforms the other two suspension systems, exhibiting a significant improvement in ride quality. Specifically, the AISD system achieves a 45% enhancement over the air suspension and an 82% improvement over the classic suspension system.

Navigating a world in conflict: The mental health implications of contemporary geopolitical crises.

Throughout history, armed conflicts have profoundly affected individuals and societies, with recent events in Ukraine, the Middle East, and beyond bringing into sharp focus the severe mental health and humanitarian consequences of geopolitical crises. Such situations often result in mass fatalities, destruction, displacement, forced migration, and other critical life events. Amid these scenarios, the adverse outcomes for mental health and well-being in both the short and long term must be emphasized. As a conceivable example of the latter, the proposed concept of intergenerational trauma could have far-reaching implications. In particular, in certain regions, civilians have repeatedly experienced instances of violence and may have continually been exposed to critical life events and traumatic stress. In this context, the consequences of these events for individual well-being and global mental health will likely be registered for years to come. Accordingly, urgent help and actions to address the mental health burdens within contemporary conflicts should be accentuated in humanitarian, political, and diplomatic interventions. Equally, health policies must adopt a long-term approach to support initiatives under the purview of global and public mental health objectives.

Exploring the Agony of the 1947 Partition and its Socio-Political Impacts Through Poetry

Exploring the Agony of the 1947 Partition and its Socio-Political Impacts Through Poetry

Sagnac-type neutron displacement-noise-free interferometeric gravitational-wave detector

The detection of low-frequency gravitational waves on Earth requires the reduction of displacement noise, which dominates the low-frequency band. One method to cancel test mass displacement noise is a neutron displacement-noise-free interferometer (DFI). This paper proposes a new neutron DFI configuration, a Sagnac-type neutron DFI, which uses a Sagnac interferometer in place of the Mach–Zehnder interferometer. We demonstrate that a sensitivity of the Sagnac-type neutron DFI is higher than that of a conventional neutron DFI with the same interferometer scale. This configuration is particularly significant for neutron DFIs with limited space for construction and limited flux from available neutron sources.

On the Local Available Potential Energy Perspective of Baroclinic Wave Development

Abstract Extratropical cyclones convert available potential energy (APE) to kinetic energy. However, our current understanding of APE conversion on synoptic scales is limited, as the well-established Lorenz APE framework is only applicable in a global, volume-integrated sense. Here, we employ a recently developed local APE framework to investigate APE and its tendencies in a highly idealized, dispersive baroclinic wave, which leads to the formation of a primary and a downstream cyclone. By utilizing a Lagrangian approach, we demonstrate that locally the downstream cyclone not only consumes APE but also generates it. Initially, APE is transported from both poleward and equatorward reservoirs into the baroclinic zone, where it is then consumed by the vertical displacement of air parcels associated with the developing cyclone. To a lesser extent, APE is also created within the cyclone when air parcels overshoot their reference state; i.e., air colder than its reference state is lifted and air warmer than its reference state is lowered. The volume integral of the APE tendency is dominated by slow vertical displacements of large air masses, whereas the dry intrusion (DI) and warm conveyor belt (WCB) of the cyclone are responsible for the largest local APE tendencies. Diabatic effects within the DI and WCB contribute to the generation of APE in regions where it is consumed adiabatically, thereby enhancing baroclinic conversion in situ. Our findings provide a comprehensive and mechanistic understanding of the local APE tendency on synoptic scales within an idealized setting and complement existing frameworks explaining the energetics of cyclone intensification.

Modelling and simulation of anisotropic growth in brain tumours through poroelasticity: A study of ventricular compression and therapeutic protocols

Malignant brain tumours represent a significant medical challenge due to their aggressive nature and unpredictable locations. The growth of a brain tumour can result in a mass effect, causing compression and displacement of the surrounding healthy brain tissue and possibly leading to severe neurological complications. In this paper, we propose a multiphase mechanical model for brain tumour growth that quantifies deformations and solid stresses caused by the expanding tumour mass and incorporates anisotropic growth influenced by brain fibres. We employ a sharp interface model to simulate localised, non-invasive solid brain tumours, which are those responsible for substantial mechanical impact on the surrounding healthy tissue. By using patient-specific imaging data, we create realistic three-dimensional brain geometries and accurately represent ventricular shapes, to evaluate how the growing mass may compress and deform the cerebral ventricles. Another relevant feature of our model is the ability to simulate therapeutic protocols, facilitating the evaluation of treatment efficacy and guiding the development of personalized therapies for individual patients. Overall, our model allows to make a step towards a deeper analysis of the complex interactions between brain tumours and their environment, with a particular focus on the impact of a growing cancer on healthy tissue, ventricular compression, and therapeutic treatment.

Evolution Law and Grouting Treatment of Water Inrush in Hydraulic Tunnel Approaching Water-Rich Fault: A Case Study

Tunnel construction adjacent to the fault fracture zone is prone to water inrush disasters, which pose a serious threat to the safety of tunnel construction. To provide theoretical support for the early warning and prevention of water inrush disasters of the tunnel adjacent to the water-rich faults, a numerical analysis based on the three-dimensional discrete element method (DEM) was performed to study the evolution of the displacement and seepage fields of the water-resistant rock mass of a tunnel adjacent to a water-rich fault during the water inrush process by taking the Xianglushan tunnel as the research project. With reference to the obtained results, a grouting reinforcement scheme was developed, and its effectiveness was evaluated. The results indicated that as the tunnel face approached the water-rich fault fracture zone, the effect of water pressure gradually became obvious, and the displacement at the face continuously increased. When the tunnel face was excavated to the position 5 m from the fault, the displacement at the center of the face changed suddenly with a sudden increase in water pressure. The water-resistant rock mass ahead of the center of the face was damaged, and a water inrush disaster occurred in the tunnel. Numerical simulation results demonstrated the feasibility of the grouting reinforcement scheme. The assessment based on the borehole acoustic waves, borehole TV, geological radar detection, and convergence monitoring as well as the excavation results confirmed that the water inrush disasters in the 2# adit of Xianglushan tunnel adjacent to the water-rich fault were effectively prevented and controlled, which can provide a reference for the prevention and treatment of the frequent water inrush disasters in underground projects constructed in the water-rich fault area.

Monoaxial Screws Versus Polyaxial Screws Osteosynthesis for Unstable Atlas Fractures: A Retrospective, Comparative Study With a Minimum Follow-Up of 3 years.

Retrospective cohort study. The study aimed to compare the radiological parameters, clinical outcomes, and long-term effects of the posterior osteosynthesis with polyaxial screw-rod system and the monoaxial screw-rod system in the treatment of unstable atlas fractures. We retrospectively analyzed the clinical data of 33 patients with posterior ORIF for unstable atlas fractures in our hospital from August 2013 to June 2020, with a minimum of 3years of follow-up. Polyaxial screws (group A) were used in 12 patients and monoaxial screws (group B) in 21 patients. Perioperative data, radiological parameters, and clinical outcomes were collected and compared between the 2 surgical approaches. The operative time, blood loss, time of screw-rod system placement, and hospital stay were significantly lower in group A than in group B. At the last follow-up, the visual analog scale (VAS) score and anterior arch reduction rate of the atlas in group A were lower than those in group B, while the lateral mass displacement (LMD) in group A was higher than that in group B. There was no significant difference between Group A and Group B in terms of the anterior atlantodental interval (AADI), posterior arch reduction rate of the atlas, range of motion (ROM), and neck disability index (NDI). Monoaxial screws can achieve better reduction results for unstable atlas fractures, especially for the anterior arch of atlas. However, the surgical operation of monoaxial screws is more complicated than that of polyaxial screws and has more complications. Appropriate implants should be selected for the treatment of unstable atlas fractures based on the type of atlas fracture, the experience of surgeons, and the demands of patients.

Slope stability analysis of an open pit mine with considering the weathering agent: Field, laboratory and numerical studies

Freezing-thawing (F-T) processes can affect the slope instability of open pit mine wall in cold regions, resulting the increase of mining operations cost and decrease the safety of personnel and equipment. Therefore, estimating the degradation of rockmass geomechanical properties under the weathering agent is crucial for slope stability analysis of an open pit mine in mountain areas. Accordingly, for optimal slope stability analysis of Angouran open-pit mine in this research, variations of physico-mechanical properties of pit wall schist rock including dry density, and uniaxial and triaxial compressive strengths were firstly measured during the defined F-T cycles. Then, the related properties of slope rock mass were determined using the generalized Hoek-Brown criterion. Based on the estimated rock mass characteristics, a numerical model of mine slope was constructed and pit stability conditions was analyzed. According to the obtained results, the displacement of slope rock mass varied from 0 to 14.6 m, occurred in highly weathered schist, indicating the low probability of large collapses. To validate the achieved results, 30 prisms were installed in the north-west wall of mine and in-situ displacements were recorded three times in week for one year. Results indicated that the measured displacements from in-situ monitoring and numerical model are in good agreement, so that the determination coefficient (R2) was obtained 0.80.

Test-retest reliability of lower limb muscle strength, jump and sprint performance tests in elite female team handball players.

This study aimed to assess the reliability of lower limb muscle function (knee extensor/flexor peak torque, rate of torque development (RTD), impulse, and countermovement jump (CMJ) performance) and sprint performance (acceleration capacity). CMJ performance was evaluated on a force plate. MVIC, RTD and impulse variables were investigated using a portable isometric dynamometer and sprint performance was assessed with dual-beam photocells in elite female athletes. CMJ test variables maximal vertical jump height, peak and mean power, concentric work, and body center of mass displacement demonstrated good-to-excellent test-retest correlations between Test 1 and Test 2 (ICC ≥ 0.70, CWw-s = 3.4-11.0%). Peak MVIC torque for the knee extensors and flexors demonstrated excellent test-retest correlations (both ICC = 0.84) along with CVw-s values of 6.8 and 6.0%, respectively. Late-phase (0-100ms, 0-200ms) RTD for the knee flexors demonstrated excellent test-retest correlations (ICC = 0.89-0.91, CVw-s = 4.8-8.5%). Sprint times at 10- and 20-m demonstrated excellent test-retest reproducibility (ICC = 0.83 and ICC = 0.90, respectively) with CVw-s values of 1.9 and 1.5%. For 5-m sprint times, test-retest reproducibility was good (ICC = 0.71) with CVw-s of 2.8%. Sprint testing performed while dribbling a handball improved (p < 0.05) from test to retest at 5-, 10- and 20-m. In conclusion, the force plate, the mobile isometric dynamometer, and dual-beam photocells provide reproducible tools for field-based testing of countermovement jump performance, knee extensor and flexor strength and sprint performance.

COMPLEX ASSESSMENT AND FORMATION OF SCENARIOS ENSURING THE BUSINESS ENTITIES INVESTMENT ATTRACTIVENESS IN THE GLOBAL CHALLENGES CONDITIONS

The new global challenges that Ukraine has faced have an ambiguous effect on the process of attracting investments in the development of the economy. The key negative factors are war and related violations of international logistics due to the destruction and closure of airports, ports, closed borders; liquidation of vital infrastructure; mass displacement of the population, which is caused by active hostilities, which creates economic threats for investing in any projects of the country due to the risks of their freezing or disruption; the annexation of certain regions, as a result of which the process of business relocation from dangerous regions became more active, causing the emergence of additional risks and losses; decrease in economic indicators and the potential of economic development, lack of a system of guaranteeing and protecting foreign investments at the state level. Therefore, ensuring investment attractiveness at the macro and micro levels is complicated by existing global challenges and requires special attention, taking into account the fact that the post-war recovery of Ukraine's economy requires attracting a sufficient level of investment on mutually beneficial terms.&#x0D; The article assesses the investment attractiveness level on the example of one of the business entities using various methods, compares the results obtained, and forms scenarios for ensuring investment attractiveness. Depending on the level of investment attractiveness of the enterprise and the corresponding type of investment potential, as well as the investment attractiveness of the industry, it is proposed to use one of the basic scenarios for ensuring investment attractiveness and the formation and realization of investment potential, which involve the implementation of one or another strategy

ENVIRONMENTAL MANAGEMENT AND JUSTICE SYSTEM IN BANGLADESH: ISSUES AND LEGAL FRAMEWORK

This paper presents environmental justice in Bangladesh which is connected with the human development, implementation and enforcement of environmental laws, regulations and policies. Environmental justice means the fair treatment of all people without discrimination of race, color, national origin and also include the development, implementation and enforcement of environmental laws, regulations, and policies. Environmental justice is very essential for the human rights which effects human lives as well as sustainable development of the country. Environmental justice also include protection against natural disasters, mass displacement, maintenance of natural resources, protection against health threats and livelihood of the Human being. Environmental justice ensures all people’s enjoyment of human rights, economic development, health protection above all healthy environment for life. There are also various environmental issues like global warming, over population, Waste disposal, Ocean acidification, loss of biodiversity, deforestation which are harmful for human lives. The Environmental problems in Bangladesh are climate change, cyclone, flood, drought, earthquake, riverbank erosion, air pollution, water pollution, soil pollution, and noise pollution etc. Environmental Justice System is the burning issues of the world and human existence depends on the sustainable development of the environment.&#x0D; &#x0D;

Progress on treatment of acetabular quadrilateral plate injury

Acetabular quadrilateral plate injury has become a hot spot and focus in the field of orthopaedic trauma and pelvic floor function in recent years. Although there are five fracture types,they are all based on fracture morphology,without considering the pulling force of ligaments,joint capsular and muscles. A perfect classification needs to describe the displacement of bone mass in three-dimensional space to better guide reduction and fixation. The seven incision and exposure methods are still the traditional open-eye surgery,and how to protect the criss-crossing vascular neural network and pelvic organs is still the focus. Quadrilateral defect causes dislocation of artificial hip joint,and quantitative evaluation of quadrilateral defect volume and revision techniques are still a hot topic. In this paper,the viewpoints of three-dimensional network structure of acetabular pelvic vascular anatomy,anatomical surgical target channel and fixation anchor point of acetabular fracture reduction are proposed to design new techniques for accurate and minimally invasive surgical operations,in order to realize the requirements of rapid orthopedic rehabilitation.

The Lower Limb Muscle Co-Activation Map during Human Locomotion: From Slow Walking to Running.

The central nervous system (CNS) controls movements and regulates joint stiffness with muscle co-activation, but until now, few studies have examined muscle pairs during running. This study aims to investigate differences in lower limb muscle coactivation during gait at different speeds, from walking to running. Nineteen healthy runners walked and ran at speeds ranging from 0.8 km/h to 9.3 km/h. Twelve lower limb muscles' co-activation was calculated using the time-varying multi-muscle co-activation function (TMCf) with global, flexor-extension, and rostro-caudal approaches. Spatiotemporal and kinematic parameters were also measured. We found that TMCf, spatiotemporal, and kinematic parameters were significantly affected by gait speed for all approaches. Significant differences were observed in the main parameters of each co-activation approach and in the spatiotemporal and kinematic parameters at the transition between walking and running. In particular, significant differences were observed in the global co-activation (CIglob, main effect F(1,17) = 641.04, p < 0.001; at the transition p < 0.001), the stride length (main effect F(1,17) = 253.03, p < 0.001; at the transition p < 0.001), the stride frequency (main effect F(1,17) = 714.22, p < 0.001; at the transition p < 0.001) and the Center of Mass displacement in the vertical (CoMy, main effect F(1,17) = 426.2, p < 0.001; at the transition p < 0.001) and medial-lateral (CoMz, main effect F(1,17) = 120.29 p < 0.001; at the transition p < 0.001) directions. Regarding the correlation analysis, the CoMy was positively correlated with a higher CIglob (r = 0.88, p < 0.001) and negatively correlated with Full Width at Half Maximum (FWHMglob, r = -0.83, p < 0.001), whereas the CoMz was positively correlated with the global Center of Activity (CoAglob, r = 0.97, p < 0.001). Positive and negative strong correlations were found between global co-activation parameters and center of mass displacements, as well as some spatiotemporal parameters, regardless of gait speed. Our findings suggest that walking and running have different co-activation patterns and kinematic characteristics, with the whole-limb stiffness exerted more synchronously and stably during running. The co-activation indexes and kinematic parameters could be the result of global co-activation, which is a sensory-control integration process used by the CNS to deal with more demanding and potentially unstable tasks like running.

Girls on the Move

As we write these words to introduce this Special Issue, scores of girls and young women around the world are facing a myriad of challenges as they are forced to flee their homes, leaving behind friends, family, communities, and being propelled into uncertain and very often precarious migratory journeys. Without a doubt, we live in deeply troubling times. While numbers provide a mere glimpse into the devastating humanitarian crisis of forced displacement, they are shocking. Forced displacement, migration, and (re)settlement following conflict, violence, human rights violations, persecution, disasters, and the impacts of climate change, both in nations and across borders, is an ever-escalating crisis affecting tens of millions of people worldwide. Acknowledging that these numbers are unprecedented, the United Nations High Commissioner for Refugees (2023a) reported that by the end of June 2023, over 110 million people were forcibly displaced worldwide and projected that this number would increase to 130 million by the end of 2024. This projected increase takes into account the mass displacement caused by the war between Israel and Hamas as well as ongoing and escalating conflicts in Sudan, Ukraine, and Afghanistan. While current headlines focus principally on the continuing crises in the Middle East and Ukraine, we cannot lose sight of the millions of forcibly displaced persons elsewhere in the world, including those in Eritrea, the Democratic Republic of the Congo, Somalia, Syria, Türkiye, Myanmar, India, Venezuela, and Haiti. Recognizing regional diversity in the staggering numbers serves to underscore forced displacement as a transnational issue that requires urgent global attention.

Application of hybrid control algorithm on the vehicle active suspension system to reduce vibrations

This research proposes a hybrid control algorithm to enhance smoothness in a vehicle’s motion. The control signal is synthesized from two separate controllers, Proportional Integral Derivative (PID) and Sliding Mode Control (SMC), to achieve superior control performance. The novelty of the proposed control algorithm lies in using a double-loop algorithm to determine the controller parameters. The algorithm proposed in this research involves two computational processes to determine the model’s optimal values including the raw value and the acceptable value. The proposed control algorithm has been simulated considering three specific cases corresponding to the three types of road stimuli. The results demonstrate that the values of sprung mass displacement and acceleration dropped considerably with the application of the proposed algorithm. Moreover, the change in vertical force at the wheel is also reduced with the application of the algorithm particularly in the third case where the vertical force at the wheel has reached to zero. The average values of vehicle body displacement are found to be 166.17 mm (for passive case), 54.20 mm (for PID), and 42.52 mm (for SMC). The proposed control algorithm managed to reduce this value to 8.95 mm as evidenced by simulation results. Finally, the response of the control system when subjected to an excitation signal from the road surface further demonstrates efficacy of the proposed hybrid control algorithm.

Exploring countermovement jump variables across competitive levels and playing positions in futsal.

The aims of this study were to compare several countermovement jump (CMJ) kinetic variables between professional (PRO) and semi-professional (SEMI-PRO) futsal players and examine the differences amongst playing positions. CMJ performance from 56 male futsal players (25.2 ± 4.8 years; weight: 74.4 ± 6.4 kg) was analysed. Players were separated into PRO (n = 29; 27.0 ± 4.4 years; 75.4 ± 6.0 kg) and SEMI-PRO (n = 27; 22.7 ± 4.3 years; 73.1 ± 6.8 kg), and according to playing position: defenders (n = 16; 25.4 ± 3.7 years; 75.2 ± 6.0 kg), wingers (n = 26; 23.5 ± 4.5 years; 72.0 ± 6.9 kg), and pivots (n = 14; 28.0 ± 5.6 years; 77.8 ± 4.3 kg). Linear mixed models and effect sizes were used for the analyses based on the mean of two jumps for each variable. PRO players presented a deeper center of mass (COM) displacement (p = 0.002, ES = 0.83), greater eccentric (Ecc) absolute (p = 0.019, ES = 0.61) and relative peak power (p = 0.046, ES = 0.52), and achieved greater Ecc peak velocities (p = 0.004, ES = 0.76) when compared to SEMI-PRO. Non-significant and trivial-to-small differences were observed in all the other CMJ variables according to the competitive level and playing position. Ecc capabilities (i.e., deeper COM displacement, greater Ecc absolute and relative peak power, and peak velocity) during vertical jump seem to differentiate PRO and SEMI-PRO players. However, CMJ variables do not discriminate amongst playing positions in futsal players.

From compassion to controversy: Unraveling the impact of societal resilience on the tapestry of attitudes towards Ukrainian refugees

BackgroundGlobal conflicts and geopolitical tensions are causing mass displacement, making refugee integration a pressing issue. The aftermath of Russia's 2022 invasion of Ukraine has resulted in over 5 million internally displaced Ukrainians and more than 8 million refugees settling across Europe. The success of their integration relies on the hospitality and attitudes of citizens of host nations. This study investigates factors influencing attitudes toward Ukrainian refugees in seven nearby countries, focusing on resilience, and both positive and negative coping mechanisms. MethodsA cross-sectional questionnaire study gathered data mostly through Internet panel samples from Georgia, Lithuania, Poland, Slovakia, the Czech Republic, Estonia, and Romania. The instruments employed in this present study include: attitudes towards refugees, societal resilience, individual resilience, community resilience, hope, morale, feeling safe at home, well-being, sense of danger, distress symptoms, post-traumatic stress disorder, perceived threats, and government support. ResultsAttitudes toward Ukrainian refugees vary across nations, with Georgia and Estonia displaying the highest acceptance (3.92 and 3.29, respectfully), and Slovakia and the Czech Republic (2.63 and 2.5, respectfully) exhibiting lower levels of positivity. Societal resilience emerged as a key factor influencing positive attitudes towards refugees. Other predictors included hope, individual and community resilience, PTSD, education, gender, and perceived threats. Females and higher-educated individuals expressed more favorable attitudes. ConclusionsFostering societal resilience and positive coping strategies is essential for refugees' integration, with targeted interventions, educational programs, and awareness campaigns playing a significant role in building empathy and aiding their acceptance. Policies should encourage social inclusion and economic opportunities for refugees and host communities, addressing negative societal attitudes. These findings may inform crisis support and policies enhancing attitudes toward refugees in host communities.

Effects of Positive and Negative Self-Talk on Balance and Postural Sway in College Students

Self-talk pertains to phrases individuals recite aloud or internally to increase motivation and focus and is a frequently used psychological skill that promotes enhanced sport performance. Several studies have examined how different these forms of self-talk can affect the execution of specific tasks in sport, but few have examined if self-talk can improve performance in basic activities of daily living, such as balance. The purpose of this study was to examine the effects of two different self-talk strategies on static balance and body stability during a single-leg balance task. Twenty-nine participants were divided into three groups (control group, positive self-talk group, negative self-talk group) and performed a single-leg balance task on the right and left leg while donning inertial measurement units and standing on a force platform and while reciting a positive, negative, or no self-talk strategy (i.e., control). No significant differences (p &gt; 0.05) were detected in the anterior-posterior center of pressure displacement and velocity, and the anterior-posterior center of mass displacement and velocity of the right and left legs. The findings of this study do not suggest that positive or negative self-talk impacts performance during a single-leg balance task.