Stability Parameters Research Articles

External validation and revision of the Lafontaine criteria for unstable distal radius fractures: a retrospective study

BackgroundThe Lafontaine criteria are the most commonly cited criteria for predicting unstable distal radius fractures. However, formal validation of the performance of these criteria remains limited. Therefore, we aimed to evaluate the Lafontaine criteria as a diagnostic prediction rule for distal radius fractures, assess the inter-rater reliability and predictive ability of various parameters for distal radius instability, and develop new criteria for fracture instability using reliable and highly predictive factors.MethodsThis retrospective study included 274 adult patients with acute distal radius fractures treated with closed reduction and immobilisation between January 2019 and December 2022. Patients who underwent immediate surgery, were lost to follow-up before 4 weeks, or had unacceptable alignment after reduction were excluded. The Lafontaine criteria were validated using the area under the receiver operating characteristic curve (AUROC). Criteria with an AUROC > 0.7 were considered acceptable. The criteria were updated using risk factors with stronger associations in the multivariable logistic regression analysis, and the inter-rater reliability of potential predictors was evaluated.ResultsThe median age of the patients was 63 years; 78% were female. Redisplacement occurred in 39% of the cases. The AUROC for the Lafontaine criteria was 0.65 (95% confidence interval [CI] 0.57–0.74). Multivariable logistic regression showed that age 56–74 years (odds ratio [OR] 3.92, 95% CI 1.82–9.16, p < 0.001) age > 74 years (OR 6.34, 95% CI 2.66–16.2, p < 0.001), associated ulna fracture (OR 1.61, 95% CI 0.92–2.84, p = 0.10), and initial radial shortening > 3 mm (OR 5.78, 95% CI 3.11–11.2, p < 0.001) were the strongest predictive factors of fracture instability. These predictors demonstrated substantial inter-rater reliability, making them suitable for clinical use. Updating the model with these risk factors resulted in an AUROC of 0.74 (95% CI 0.66–0.82).ConclusionsThe performance of the Lafontaine criteria in discriminating unstable distal radius fractures was unacceptable in our study cohort. The updated criteria using age group (< 56 years, 56–74 years, and > 74 years), associated ulnar fractures, and initial radial shortening > 3 mm was found to have moderate discrimination; however, further research is warranted to improve the prediction and measurement reliability of fracture instability.

Comparative study of stability models for identifying stable spring wheat genotypes in diverse conditions

To assess the agronomic performance and genetic stability for grain yield, a set of 36 spring wheat genotypes were grown consecutively for two crop seasons in six environments with varying sowing dates at ICAR-Indian Agricultural Research Institute, New Delhi using randomized complete block design with three replications. Significant genotypic differences were observed for all the studied morpho-physiological characters in both the crop seasons suggesting the presence of substantial genetic variability among the genotypes studied. Parametric and nonparametric stability analysis methods, along with advanced techniques like AMMI and GGE biplot analysis, were employed to understand genotype-environment interactions. Positive correlations were found between yield and stability parameters, highlighting the importance of selecting genotypes with both high yield and stability. Based on the wide-ranging evaluations, three out of 36 genotypes viz., DW1615, HD3262, and DW1631, emerged most promising ones consistently demonstrated superior performance across multiple methodologies. The study underscores the need to follow a multifaceted approach for genotype evaluation to ensure sustainable improvement in wheat production systems, enabling breeders to make informed decisions for resilience and productivity in diverse/varying environmental conditions.

Correlation between multiple geometric parametric instability sidebands and sidelobes in periodically modulated graded-index multimode fibers

Correlation between multiple geometric parametric instability sidebands and sidelobes in periodically modulated graded-index multimode fibers

The Influence of Different Hot-Dip Zinc Coating Types on the Gas Metal Arc Welding of Galvanized Steel Sheets

Abstract The work was focused on evaluating the influence of the structure of the protective Zn coating on steel sheets on arc welding. Two types of galvanized steel sheets were used in the experiments, HX340LAD + ZF (GA type) and HX300LAD + Z (GI type), with a thickness of 2 mm. First, the analysis of the structure of the Zn protective layer was carried out on the selected materials. After that, test welds were made using the gas metal arc (GMA) welding in the short-circuit metal transfer. The influence of the type of protective Zn coating on the occurrence of defects, the geometry of the weld, and the stability of the welding process was evaluated. From the achieved results, it can be concluded that the protective Zn layer on the HX340LAD + ZF sheet was formed by intermetallic phases FexZny-Fe concentration ranged from 19.0 wt.% (at the steel plate coating interface) up to 9.5 wt.% (on the coating surface). An Fe-Al inhibitor layer was observed at the steel sheet-coating interface of the HX300LAD + Z material, while the Fe content in the Zn coating decreased from 8.2 to 0.8 wt.% towards the surface. Better weld evaluation results were achieved on samples made on HX340LAD + ZF galvanized sheet. The welds were without porosity, and the stability parameter (electric arc stability criterion) was almost two times smaller than the stability parameter in the evaluation of the HX300LAD + Z sheet metal welding process.

Optimizing the thermostability of triketone dioxygenase for engineering tolerance to mesotrione herbicide in soybean and cotton

Optimized triketone dioxygenase (TDO) variants with enhanced temperature stability parameters were engineered to enable robust triketone tolerance in transgenic cotton and soybean crops. This herbicide tolerance trait, which can metabolize triketone herbicides such as mesotrione and tembotrione, could be useful for weed management systems and provide additional tools for farmers to control weeds. TDO has a low melting point (~39°C–40°C). We designed an optimization scheme using a hypothesis-based rational design to improve the temperature stability of TDO. Temperature stabilization resulted in enzymes with Kcat values less than half of wild-type TDO. The best variant TDO had a Kcat of 1.2 min−1 compared to wild-type TDO, which had a Kcat of 2.7 min−1. However Km values did not change much due to temperature stabilization. Recovery of the Kcat without losing heat stability was the focus of additional optimization. Multiple variants were found that had better heat stability in vitro and efficacies against mesotrione equaling the wild-type (WT) TDO in greenhouse and field tests.

Learning and Uncertainty Compensation in Robotic Motion Systems using Li-Slotine Adaptive Tracking and Intelligent Adaptive Control

This paper examines adaptive control strategies for stabilizing robots, focusing on Li-Slotine adaptive control and Iterative Learning Control (ILC). Both methods handle uncertainties through learning and compensation, ensuring stability and precision. Li-Slotine control, based on Lyapunov theory, dynamically adjusts parameters for asymptotic stability in uncertain systems. ILC improves performance in repetitive tasks by refining control inputs using tracking errors, making it suitable for robotics and manufacturing. While Li-Slotine excels in real-time adaptation and robustness to disturbances, its computational demands challenge high-degree-of-freedom systems. ILC enhances accuracy through iterative learning but is sensitive to noise and requires careful tuning. MATLAB simulations and experimental results demonstrate the effectiveness of both approaches. Future work will explore hybrid frameworks that combine the adaptability of Li-Slotine with the data-driven refinement of ILC to provide robust solutions for complex, dynamic robotic systems.

Use of aluminum nitride ceramic plates to ensure the temperature stability of measurement amplifiers

Analysis of recent research and publications. The outlined scientific issues are pre-sented from different angles in the works of many modern scholars. For example, the peculi-arities of the production of ceramic boards made of aluminum nitride and the possibilities of their use in various devices are presented in the articles of such researchers as J. Raueneker , G. Okada. Raucheneker, T. Konegger, H. Okada, K. Fukuda, S. Kasap, T. Yanagida, M. Signor, G. Reschio, C. DePasquale, V. Iacovacci, P. Dario, A. Leone, F. Quaranta, L. Francioso. The main dynamic physical and chemical properties, in particular, the thermal conduc-tivity parameters of crystal lines, thin (thick) films and ceramic boards of the AIN type, as well as the possibilities of their application in various fields of electronics production, are covered in the works of the following scientists: Y. Tuz, O. Kozyr, A. Porhun, Y. Chen, H. Song, D. Li, X. Sun, H. Jiang, G. Miao, Y. Zhou, Z. Cheng, Y. Ko, A. Mamun, T. Bai K. Hein L. Yates S. Graham, N. Kim, M. Yarali, M. Moradnya, M. Aqib, S. Liao, F. Al-Qatar M. Nong, J. Rhee, Y. Ko, Z. Cheng A. Mamun, Z. Liu T. Bai, K. Hussein, P. Hopkins, M. Neger, M. Herman, O. Fabrishna, D. Pavlyuchkov, H. Seifert, S. Pandit, M. Schneider, S. Berger, S. Schwartz, U. Schmid, H. Shi, W. Li, W. Kao, Y. Chuang, R. Lin, H. Lin, M. Shiojiri, M. Chen, M. Signor, L. Velardi, C. Depascali, I. Kuznetsova, L. Blasi, F. Biscaglia, F. Quaranta, L. Francioso, R. Xu, M. Rojo, S. Islam, A. Sud, B. Vareskic, A. Catre, N. Mingo, E. Pop. The aim of the study is to obtain temperature-stable nitride-aluminum ceramic boards that would ensure the temperature stability of measuring amplifiers Summary of the main material. The article presents the results of synthesis and manu-facturing technology of aluminum nitride ceramics. It has been established that the introduc-tion of various additives into the initial mixture increases the toxicity of gaseous emissions, complicates the work, and increases the cost of aluminum nitride. Large-sized parts (60×70×5 mm) with a thermal conductivity of 160 W/(m K) from a temperature-stable ce-ramic composite based on AlN were obtained by free sintering for use in the development of a broadband high-voltage amplifier. It is proved that the most effective removal of oxygen from the crystal lattice of aluminum nitride is achieved at an equivalent ratio of yttrium oxide in the amount of 5%. The effect of yttrium oxide additive on the thermal conductivity of a func-tional composite with a ceramic matrix based on aluminum nitride obtained by free sintering was studied. Conclusions. Based on the studies of the samples and the analysis of the data obtained, it can be argued that the effect of static error can be compensated for by using iterative cor-rection. To use iterative correction, the system must be stable and its parameters must not change over time. A rational method of parameter stabilization is proposed to ensure a com-mon and homogeneous temperature field that will affect all components equally by using highly thermally conductive materials.

Acute effects of voluntary breathing patterns on postural control during walking.

Breathing and postural control is reported to be both neuromuscularly and mechanically interdependent. To date, the effects of voluntary abdominal and thoracic breathing (VAB and VTB) on the EMG activity of muscles involved in both respiratory and postural functions, as well as gait biomechanics related to these breathing patterns, have not been investigated in young, healthy adults. The aim of the study was to evaluate the EMG responses of neck and trunk muscles, as well as the kinematic, stability, and kinetic parameters of gait induced by VAB and VTB compared to involuntary breathing (INB). Twenty-four healthy, physically active participants (12 men and 12 females) were required to complete three two-minute walking sessions on an instrumented treadmill (e.g. devices with capacitive sensors embedded beneath the running belt) at 5.0kmh-1, first with INB and then alternatively with VAB and VTB. A respiratory inductive plethysmography unit was used to provide real-time visual feedback of the breathing pattern performed by each participant. The EMG activity of the sternocleidomastoid (SCM), upper trapezius (UT), thoracic and lumbar erector spinae (TES and LES), as well as spatiotemporal (step width, stride length, stride time, stance phase, swing phase, and cadence), stability (anteroposterior and mediolateral center of pressure trajectory), and dynamic gait parameters (vertical ground reaction forces, vGRF) were recorded during each testing condition. Our findings revealed that both voluntary breathing patterns significantly affected the EMG activity of the SCM (p<0.01) and UT (p<0.05), with the activity between these muscles, as expressed by the SCM:UT ratio, being more balanced during VAB (0.94) and VTB (1.05) compared to INB (0.73). Additionally, VAB walking led to a narrower step width (p<0.01) and reduced vGRF over the forefoot (p<0.01) compared to INB walking. Neither VAB nor VTB influenced the activation levels of the LES and TES, nor did they affect other spatiotemporal, stability, or dynamic gait parameters (p>0.05). Our findings suggest that certain gait parameters (e.g. step width, forefoot vGRFs) are primarily influenced by VAB compared to INB, likely due to the more balanced activation of the SCM and UT muscles. This balanced activation may enhance head stability and control during walking, thereby contributing to improved postural control.

A many-facet Rasch measurement model approach to investigating objective structured clinical examination item parameter drift.

Objective Structured Clinical Examinations (OSCEs) are widely used for assessing clinical competence, especially in high-stakes environments such as medical licensure. However, the reuse of OSCE cases across multiple administrations raises concerns about parameter stability, known as item parameter drift (IPD). AIMS &OBJECTIVES: This study aims to investigate IPD in reused OSCE cases while accounting for examiner scoring effects using a Many-facet Rasch Measurement (MFRM) model. Data from 12 OSCE cases, reused over seven administrations of the Internationally Educated Nurse Competency Assessment Program (IENCAP), were analyzed using the MFRM model. Each case was treated as an item, and examiner scoring effects were accounted for in the analysis. The results indicated that despite accounting for examiner effects, all cases exhibited some level of IPD, with an average absolute IPD of 0.21 logits. Three cases showed positive directional trends. IPD significantly affected score decisions in 1.19% of estimates, at an invariance violation of 0.58 logits. These findings suggest that while OSCE cases demonstrate sufficient stability for reuse, continuous monitoring is essential to ensure the accuracy of score interpretations and decisions. The study provides an objective threshold for detecting concerning levels of IPD and underscores the importance of addressing examiner scoring effects in OSCE assessments. The MFRM model offers a robust framework for tracking and mitigating IPD, contributing to the validity and reliability of OSCEs in evaluating clinical competence.

Sodium Bicarbonate Irrigation for Dissolving Obstructive Bronchial Clots in a Polytrauma Patient: A Case Report

The management of bronchial clots in polytrauma patients remains challenging, with limited efficacy of current methods. This case report details the successful use of sodium bicarbonate (NaHCO₃) irrigation to dissolve obstructive bronchial clots in a 27-year-old male with ARDS secondary to trauma. Pre-intervention, the patient exhibited severe hypoxemia with a P/F ratio of 50, requiring FiO₂ 60% and PEEP 10 cmH₂O. Bronchoscopic irrigation with 8.4% NaHCO₃ dissolved organized clots resistant to saline lavage, facilitating their removal. Within 48 hours, oxygenation improved significantly, with a P/F ratio rising to 230. By day 11, the patient was successfully extubated and maintained stable respiratory parameters. This case highlights the potential utility of NaHCO₃ in addressing complex respiratory complications, warranting further research.

Sodium Bicarbonate Irrigation for Dissolving Obstructive Bronchial Clots in a Polytrauma Patient: A Case Report

The management of bronchial clots in polytrauma patients remains challenging, with limited efficacy of current methods. This case report details the successful use of sodium bicarbonate (NaHCO₃) irrigation to dissolve obstructive bronchial clots in a 27-year-old male with ARDS secondary to trauma. Pre-intervention, the patient exhibited severe hypoxemia with a P/F ratio of 50, requiring FiO₂ 60% and PEEP 10 cmH₂O. Bronchoscopic irrigation with 8.4% NaHCO₃ dissolved organized clots resistant to saline lavage, facilitating their removal. Within 48 hours, oxygenation improved significantly, with a P/F ratio rising to 230. By day 11, the patient was successfully extubated and maintained stable respiratory parameters. This case highlights the potential utility of NaHCO₃ in addressing complex respiratory complications, warranting further research.

Saturation of a Quasi-mode parametric instability in an inhomogeneous plasma

Saturation of a Quasi-mode parametric instability in an inhomogeneous plasma

Can the combination of citicoline and vitamin B12 be beneficial in the healing of corneal nerves after corneal cross-linking?

To evaluate the effect of topical citicoline, vitamin B12 and hyaluronic acid (OMK2 eye drops; Omikron Italia Srl, Italy) on the healing of corneal nerve after corneal cross-linking (CXL) treatment in patients with keratoconus (KC). A total of 44 eyes of 22 patients with KC who underwent CXL were included in this prospective study. After CXL, one eye of these patients received OMK2 eye dropandstandard post-CXL treatment (OMK2 group), while the fellow eye received onlystandard post-CXL treatment (control group). The following parameters were analyzed in the pre- and post-CXL procedure periods (1st, 3rd and 6th months): corneal sensitivity, tear film stability, central corneal thickness (CCT), and the corneal sub-basal nerve plexus (sbNP) parameters (including corneal nerve fiber density [CNFD], corneal nerve branch density [CNBD], corneal nerve fiber length [CNFL], corneal total branch density [CTBD], corneal nerve fiber area [CNFA], corneal nerve fiber width [CNFW]). Following CXL, a comparison of the baseline and month 6 data revealed that CNFA decreased in the control group (p < 0.001) and did not differ in the OMK2 group (p = 0.283). Other corneal sbNP parameters exhibited a decrease when comparing baseline and 6months in each group (all p < 0.05). In addition, CCT in the OMK2 group was not significantly different between baseline and month 6 (p = 0.052). However, a decline in CCT of the control groups was observed during this specified time interval (p = 0.009). Corneal sensitivity or tear film stability parameters did not differ significantly between groups at any time point or over time within each group (all p > 0.05). The use of OMK2 eye drop after CXL may provide more stable CNFA. In addition, it may also provide faster recovery in CCT.

MODELLING NIGERIAN STOCK RETURNS WITH ARMA-EGARCH: A VOLATILITY ANALYSIS

This study analyzes the volatility of Nigerian stock returns from January 2, 2010, to December 31, 2022, using ARMA-EGARCH models with Generalized Error Distribution (GED). Four model specifications are assessed: ARMA-EGARCH (1,1), ARMA-EGARCH (1,2), ARMA-EGARCH (2,1), and ARMA-EGARCH (2,2). The focus is on model selection, parameter estimation, and diagnostic testing to determine the best model for capturing volatility dynamics. The ARMA-EGARCH (2,2) GED model emerges as the best based on AIC, BIC, and high log-likelihood values, offering a good balance of fit and complexity. The ARMA-EGARCH (1,1) GED model is noted for effectively balancing simplicity and fit while capturing volatility and asymmetric effects. However, all models show limitations in fully capturing volatility dynamics and maintaining parameter stability, particularly concerning volatility clustering. The ARMA-EGARCH (2,2) model consistently performs best across various statistical criteria, including AIC and BIC. Although it provides a robust fit, it has some limitations in serial correlation and model stability. This indicates the need for further model refinement and exploration to enhance forecasting accuracy and address intrinsic limitations. These findings are valuable for investors and policymakers in understanding stock market volatility modelling both in Nigeria and globally.

Multi-band photometric study of the short period eclipsing binary ATO J007.0177+43.4841: physical properties and evolutionary status

We present a detailed photometric analysis of the newly identified binary system, ATOJ007.0177+43.4841, based on observations from the Kottamia Astronomical Observatory and the Zwicky Transient Facility. The system is classified as an A-type W UMa binary with a low mass ratio of q=0.182±0.001. A temperature difference of approximately 450 K between the components is observed, along with evidence of magnetic activity (manifested as the O’Connell effect) in the secondary star. This activity is attributed to a cool spot with a radius of 16 degrees and a temperature 30% lower than the surrounding region. The system’s geometry, characterized by an almost zero fill-out ratio, suggests that it is in a transient phase between detached and contact configurations, commonly referred to as shallow contact. This interpretation is further supported by an analysis of the system’s dynamical evolution and its thermal stability parameter, S=-0.02, indicating marginal stability. Additionally, the evolutionary status of the system is examined in the context of its position along the zero-age main sequence and terminal-age main sequence. The analysis suggests that the system’s evolution is primarily driven by angular momentum loss due to magnetic stellar wind and tidal coupling mechanisms.

Sub-Daily Performance of a Convection-Permitting Model in Simulating Decade-Long Precipitation over Northwestern Türkiye

One of the main differences between regional climate model and convection-permitting model simulations is not just how well topographic characteristics are represented, but also how deep convection is treated. The convection process frequently occurs within hours, thus a sub-daily scale becomes appropriate to evaluate these changes. To do this, a series of simulations has been carried out at different spatial resolutions (0.11 and 0.025) using the COSMO-CLM (CCLM) climate model forced by the ECMWF Reanalysis v5 (ERA5) between 2011 and 2020 over a domain covering northwestern Türkiye. Hourly precipitation and heavy precipitation simulated by both models were compared with the observations by Turkish State Meteorological Service (TSMS) stations and Integrated Multi-satellitE Retrievals for GPM (IMERG). Subsequently, we aimed to identify the reasons behind these differences by computing several atmospheric stability parameters and conducting event-scale analysis using atmospheric sounding data. CCLM12 displays notable discrepancies in the timing of the diurnal cycle, exhibiting a premature shift of several hours when compared to the TSMS. CCLM2.5 offers an accurate representation of the peak times, considering all hours and especially those occurring during the wet hours of the warm season. Despite this, there is a tendency for peak intensities to be overestimated. In both seasons, intensity and extreme precipitation are highly underestimated by CCLM12 compared to IMERG. In terms of statistical metrics, the CCLM2.5 model performs better than the CCLM12 model under extreme precipitation conditions. The comparison between CCLM12 and CCLM2.5 at 12:00 UTC reveals differences in atmospheric conditions, with CCLM12 being wetter and colder in the lower troposphere but warmer at higher altitudes, overestimating low-level clouds and producing lower TTI and KI values. These conditions can promote faster air saturation in CCLM12, resulting in lower LCL and CCL, which foster the development of low-level clouds and frequent low-intensity precipitation. In contrast, the simulation of higher TTI and KI values and a steeper lapse rate in CCLM2.5 enables air parcels to enhance instability, reach the LFC more rapidly, increase EL, and finally promote deeper convection, as evidenced by higher CAPE values and intense low-frequency precipitation.

SUV-pedestrian crash severity modelling considering unobserved heterogeneity in means and variances

SUV-type vehicles (light trucks, minivans, vans, SUVs) pose significant risks to pedestrians due to their size and weight. This study analyzed pedestrian crashes involving SUVs using Louisiana traffic crash data (2017–2021) with a random parameter ordered probit model to account for unobserved heterogeneity. Factors linked to higher pedestrian injury severity include winter conditions, divided roads, midblock crossings, business/residential areas, and drivers aged 25–65. Lower injury severity is associated with state highways, city streets, low-speed roads (<25 mph), undivided two-way roads, and intersections. Stability of parameters was observed over time, particularly for crashes involving single SUVs and pedestrians in normal conditions. Variations in variables like "white dashed line" and "proceeding straight ahead" highlight the influence of daylight and speed limits. At the policy level, integrating these findings into traffic management and urban development practices can support a more effective approach to reducing pedestrian injuries in SUV-related crashes.

Performance of Eight Elite Mulberry Genotypes for Different Growth and Leaf Yield Parameters in Different Seasons and Their Stability

An investigation was undertaken to study the mean performance of elite mulberry genotypes across different seasons at Department of Sericulture, UAS, GKVK, Bengaluru during 2023-24. Stability parameters were estimated and considered for testing the stability of the mulberry genotypes. A stable and promising genotype was identified based on a higher mean, unitary regression (bi) values and minimal or near-zero deviation from regression (S²di). However, the majority of genotypes are less environmental sensitive and adapted to all seasons, thus it is possible to predict performance across all seasons. For vegetative growth parameters across winter, summer and rainy seasons, MI-0014 recorded superiority in almost all the traits studied, including leaf yield per plant, number of branches per plant and shorter internodal distance across three seasons. Genotypes MI-0014 and ME-0067 are considered stable across three seasons based on the G × E interaction and their consistent performance in leaf yield and vegetative trait.

The effect of cervical spine flexion-extension motion on odontoid parameters

ObjectiveTo assess the stability of odontoid parameters on flexion-extension motion and to validate the accuracy of the physiological cervical lordosis (CL) predictive formula across different cervical positions.MethodsStandard cervical spine lateral radiographs in neutral, flexion, and extension positions were collected to measure odontoid incidence (OI), odontoid tilt (OT), C2 slope (C2S), CL, T1 slope (T1S), and T1S minus CL (T1S-CL). Friedman’s test was used to assess the differences in parameters among the three cervical spine positions. The predictive performance of the formula CL = 0.36× OI − 0.67 × OT − 0.69 × T1S was assessed and validated using the Pearson correlation coefficient (r), coefficient of determination (R²), mean squared error (MSE), and mean absolute error (MAE).ResultsNo significant differences were found for OI and T1S among the three different cervical spine positions (p = 0.162 and p = 0.186, respectively). There was a strong, significant positive correlation between the predicted value and actual value of physiological CL at three cervical positions (neutral, flexion, and extension). The predictions for the neutral position were the most accurate, with statistical measures of r = 0.85 (p < 0.01), R²=0.82, MAE = 4.28, and MSE = 27.77.ConclusionOI is a stable and reliable anatomic parameter, not affected by cervical spine flexion-extension motion. OI can serve as a supplementary parameter for evaluating cervical sagittal balance and compensatory ability. The formula CL = 0.36×OI − 0.67×OT − 0.69×T1S provides the best predictions for physiological CL in the neutral position.

Rhythm therapy as a method of rehabilitation of patients with postural disorders against the background of Parkinson's disease

The article is devoted to the study of the influence of rhythm therapy as a component of rehabilitation on postural stability, balance, spatial and temporal parameters of movements and quality of life of patients with postural disorders against the background of Parkinson's disease. The aim of the study was to evaluate the effect of a rehabilitation course using rhythm therapy on motor and postural functions, as well as the quality of life of patients with Parkinson's disease. As a result of the intervention, significant improvements in the spatio-temporal parameters of walking were recorded: an increase in the length of the step and double step, a reduction in the time of support and the time for performing functional tests. The analysis of the stabilometric data showed a decrease in fluctuation by 22.05% and an increase in the symmetry index by 13.11%, which indicates an improvement in balance and equilibrium. Changes in the angles of inclination of the spine and the lengths of the chord arches indicate a decrease in deformities and restoration of posture. In addition, the number of falls decreased by 75%, and the quality of life of patients increased by 25%. The results obtained are comparable with the effects of other rehabilitation methods, including dance therapy, and confirm the high effectiveness of a comprehensive program with rhythm therapy to restore motor activity, increase stability and improve the quality of life in patients with Parkinson's disease.