Comparison of the flexural strength of printed and milled denture base materials.

BACKGROUND: To evaluate the flexural strength of digitally milled and printed denture base materials. METHODS: The materials tested were Lucitone 199 denture base disc (Dentsply Sirona), AvaDent denture base puck (AvaDent), KeyMill denture base disc (Keystone), Lucitone digital print denture base resin (Dentsply Sirona), Formlab denture base resin (Formlabs), and Dentca base resin II (Dentca). Sixty bar-shaped specimens of each material were prepared for flexural strength testing and were divided into five groups: control, thermocycled, fatigue cycled, and repair using two different materials. The flexural strength and modulus were tested using a 3-point bend test performed on an Instron Universal Testing Machine with a 1kN load cell. The specimens were centered under a loading apparatus with a perpendicular alignment. The loading rate was a crosshead speed of 0.5 mm/min. Each specimen was loaded with a force until failure occurred. A one-way ANOVA test was used to analyze the data, followed by Tukey's HSD test (α = 0.05). RESULTS: The milled materials exhibited higher flexural strength than the printed materials. Thermocycling and fatigue reduce the flexural strengths of printed and milled materials. The repaired groups exhibited flexural strengths of 32.80% and 30.67% of the original flexural strengths of printed and milled materials, respectively. Nevertheless, the type of repair material affected the flexural strength of the printed materials; the composite resin exhibited higher flexural strength values than the acrylic resin. CONCLUSIONS: The milled denture base materials showed higher flexural strength than the printed ones.

Effect of continuous vs sequential chelation on the mechanical properties of root dentin: An ex vivo study.

OBJECTIVES: To evaluate the mechanical properties of root canal dentin treated with sodium hypochlorite (NaOCl) in combination with hydroxyethylidene diphosphonic acid (HEDP) or ethylenediaminetetraacetic acid (EDTA). METHODS: For testing fracture resistance, 45 single-rooted teeth were instrumented and irrigated with NaOCl/HEDP, NaOCl/EDTA, or distilled water. Fifteen untreated teeth served as control. After obturation, specimens from the experimental groups were thermocycled, dynamically-loaded, and then statically-loaded in a universal testing machine until failure. For flexural strength analysis, 15 teeth were instrumented and irrigated with NaOCl/HEDP or NaOCl/EDTA. Root segments were sectioned into dentin bars and tested for flexural strength using a universal testing machine. For microhardness evaluation, 20 teeth were instrumented and irrigated with NaOCl/HEDP or NaOCl/EDTA. Dentin disks from the coronal-third of each root segment were prepared, one before and one after irrigation, for microhardness testing with a Knoop hardness tester. RESULTS: The highest fracture resistance was recorded in the untreated group, and the lowest in the EDTA group. Although the HEDP group had higher fracture resistance than the EDTA group, the distilled water group demonstrated even greater fracture resistance than the HEDP group. Specimens treated with HEDP had significantly higher flexural strength and microhardness values when compared with those treated with EDTA. CONCLUSION: The fracture resistance, flexural strength, and microhardness of root canal dentin were higher when root canals were irrigated with NaOCl/HEDP, when compared with NaOCl/EDTA. CLINICAL SIGNIFICANCE: Irrigating root canals with NaOCl combined with HEDP significantly improves the mechanical integrity of root canal dentin compared to the use of NaOCl with EDTA.

Evaluation of setting kinetics, mechanical strength, ion release, and cytotoxicity of high-strength glass ionomer cement contained elastomeric micelles.

BACKGROUND: Low mechanical properties are the main limitation of glass ionomer cements (GICs). The incorporation of elastomeric micelles is expected to enhance the strength of GICs without detrimentally affecting their physical properties and biocompatibility. This study compared the chemical and mechanical properties, as well as the cytotoxicity, of elastomeric micelles-containing glass ionomer cement (DeltaFil, DT) with commonly used materials, including EQUIA Forte Fil (EF), Fuji IX GP Extra (F9), and Ketac Molar (KT). METHOD: Powder particles of GICs were examined with SEM-EDX. Setting kinetics were assessed using ATR-FTIR. Biaxial flexural strength/modulus and Vickers surface microhardness were measured after immersion in water for 24 h and 4 weeks. The release of F, Al, Sr, and P in water over 8 weeks was analyzed using a fluoride-specific electrode and ICP-OES. The toxicity of the material extract on mouse fibroblasts was also evaluated. RESULTS: High fluoride levels in the powder were detected with EF and F9. DT demonstrated an initial delay followed by a faster acid reaction compared to other cements, suggesting an improved snap set. DT also exhibited superior flexural strength than other materials at both 24 h and 4 weeks but lower surface microhardness (p < 0.05). EF and F9 showed higher release of F, Al, and P than DT and KT. There was no statistically significant difference in fibroblast viability among the tested materials (p > 0.05). CONCLUSIONS: Elastomeric micelles-containing glass ionomer cement (DT) exhibited satisfactory mechanical properties and cytocompatibility compared with other materials. DT could, therefore, potentially be considered an alternative high-strength GIC for load-bearing restorations.

Effect of E-glass fibers addition on compressive strength, flexural strength, hardness, and solubility of glass ionomer based cement.

BACKGROUND: In dentistry, glass-ionomer cements (GICs) are extensively used for a range of applications. The unique properties of GIC include fluoride ion release and recharge, chemical bonding to the tooth's hard tissues, biocompatibility, a thermal expansion coefficient like that of enamel and dentin, and acceptable aesthetics. Their high solubility and poor mechanical qualities are among their limitations. E-glass fibers are generally utilized to reinforce the polymer matrix and are identified by their higher silica content. OBJECTIVES: The purpose of the study was to assess the impact of adding (10 wt% and 20 wt%) silane-treated E-glass fibers to traditional GIC on its mechanical properties (compressive strength, flexural strength, and surface hardness) and solubility. METHODS: The characterization of the E-glass fiber fillers was achieved by XRF, SEM, and PSD. The specimens were prepared by adding the E-glass fiber fillers to the traditional GIC at 10% and 20% by weight, forming two innovative groups, and compared with the unmodified GIC (control group). The physical properties (film thickness and initial setting time) were examined to confirm operability after mixing. The evaluation of the reinforced GIC was performed by assessing the compressive strength, flexural strength, hardness, and solubility (n = 10 specimens per test). A one-way ANOVA and Tukey tests were performed for statistical analysis (p ≤ 0.05). RESULTS: The traditional GIC showed the least compressive strength, flexural strength, hardness, and highest solubility. While the GIC reinforced with 20 wt% E-glass fibers showed the highest compressive strength, flexural strength, hardness, and least solubility. Meanwhile, GIC reinforced with 10 wt% showed intermediate results (P ≤ 0.05). CONCLUSION: Using 20 wt% E-glass fiber as a filler with the traditional GIC provides a strengthening effect and reduced solubility.

Illumination matters part IV: blackout and whiteout in flexible ureteroscopy - first report on a phenomenon observed by PEARLS.

PURPOSE: To date, no study has evaluated effects of varying brightness settings on image quality from flexible ureteroscopes submerged in saline. The aim was to evaluate blackout and whiteout occurrences in an in-vitro kidney calyx model. MATERIAL AND METHODS: We evaluated a series of contemporary flexible ureteroscopes including the Storz Flex-Xc and Flex-X2s, Olympus V3 and P7, Pusen 7.5F and 9.2F, as well as OTU WiScope using a 3D-printed enclosed pink in-vitro kidney calyx model submerged in saline. Endoscopic images were captured with ureteroscope tip placed at 5 mm,10 mm and 20 mm distances. The complete range of brightness settings and video capture modes were evaluated for each scope. Distribution of brightness on a grayscale histogram of images was analyzed (scale range 0 to 255). Blackout and whiteout were defined as median histogram ranges from 0 to 35 and 220 to 255, respectively (monitor image too dark or too bright for the human eye, respectively). RESULTS: Blackout occurred with the P7, Pusen 7.5F, 9.2F and WiScope at all distances, and V3 at 20 mm - with lowest brightness settings. Whiteout occurred with Flex-X2s, V3 and P7 at 5 mm and 10 mm, as well as with V3 and P7 at 20 mm - mostly with highest brightness settings. The Flex-Xc had neither blackout nor whiteout at all settings and distances. CONCLUSION: Blackout or whiteout of images is an undesirable property that was found for several scopes, possibly impacting diagnostic and therapeutic purposes during ureteroscopy. These observations form a guide to impact a urologist's choice of instruments and settings.

In vitro Comparison of the Mechanical and Optical Characteristics of 5 Disposable Flexible Ureteroscopes.

INTRODUCTION: Disposable (single-use) flexible ureteroscopes are alternatives to reusable ureteroscopes. With their superior surgical efficacy and safety in the presence of upper urinary calculi, disposable ureteroscopes aim to overcome the main limitations of conventional reusable ureteroscopes. However, studies on the performance of the most recently developed models of single-use flexible ureteroscopes are scarce. This study aimed to compare the in vitro performance of several recently introduced, single-use, flexible ureteroscopes. METHODS: Five disposable flexible ureteroscopes were tested in vitro to evaluate their mechanical and optical characteristics. To this end, their degrees of deflection, irrigation flow rates, and image qualities were investigated. The models examined were Innovex US31-B12, OTU-100RR, Redpine RP-U-C12, Sciavita SUV-2A-B, and Seplou URS3016E. Their performance was also compared with that of a reusable flexible ureteroscope, Olympus URV-F. RESULTS: The OTU device had the highest degrees of deflection and the smallest loop diameter of the disposable ureteroscopes. The single-use ureteroscopes had identical image resolutions at a distance of 1 cm. The Innovex and Redpine devices had the best color representation. CONCLUSIONS: Of the tested disposable ureteroscopes, the OTU device had the best mechanical attributes, given its small loop diameter, high deflection angles, and low irrigation flow loss. As to their optical properties, the resolutions of all 5 single-use models were identical at an image distance of 1 cm.

The Impact of Oxygen Concentration on the Postcuring of 3D-Printed Dental Resin.

PURPOSE: This study investigated the impact of reducing the oxygen concentration via nitrogen injection during the postcuring process of 3D-printed dental materials. MATERIALS AND METHODS: Resin specimens for dental crown and bridge (15-mm diameter, both 1-mm and 2-mm heights) were 3D-printed and rinsed. Subsequently, the postcuring process was conducted on nine groups categorized according to atmospheric conditions within the curing device (20% [control], 10%, and 5% oxygen) and curing times (10, 15, and 20 minutes). Surface roughness was measured using a gloss meter. Surface polymerization was confirmed through Fourier-transform infrared spectroscopy (FT-IR) analysis, and the flexural strength and elastic modulus of the specimens were measured using a universal testing machine. Water absorption and solubility were determined according to Inernational Organization for Standardization (ISO) standards. All evaluation criteria were statistically analyzed using one-way ANOVA and Tukey's post hoc test based on oxygen concentration. RESULTS: The elastic modulus did not show statistically significant differences in all groups. However, compared to the control group, the flexural strength, degree of conversion, and gloss significantly increased in the groups with decreased oxygen concentrations. Conversely, water solubility and water absorption significantly decreased in a few groups with reduced oxygen concentration. CONCLUSIONS: Reducing oxygen concentration through nitrogen injection during the postcuring process of 3D printing enhances the suitability of the dental prosthetic materials. The significant increase in flexural strength can particularly enhance the utility of these materials in dental prosthetics.

7.5F Mini Flexible Ureteroscope in Retrograde Intrarenal Surgery: Initial Results from a Multicenter Randomized Clinical Trial.

Objective: To report the initial results of an randomized clinical trail comparing the safety and efficacy between 7.5F and 9.2F flexible ureteroscope (FUS) in the management of renal calculi <2 cm. Materials and Methods: Eighty patients were enrolled and received retrograde intrarenal surgery (RIRS) with a different size FUS. The operation results and complications were compared. Results: Two cases in the 7.5F group and four cases in the 9.2F group failed to insert the 12/14F ureteral access sheath (UAS), respectively, and no significant difference (p = 0.396) was noted. However, 10/12F UAS was inserted in the 7.5F group, but not available in the 9.2F group, and thus, the 10/12F UAS inserting rate in the 7.5F group was higher than in the 9.2F group (100% vs 0%, p = 0.014), and the UAS insertion failure rate in 9.2F group was higher than in the 7.5F group (10% vs 0%, p = 0.040). The operation time in 7.5F group was shorter than the 9.2F group (35.60 ± 7.86 vs 41.05 ± 8.14, p = 0.003). Less irrigation was required in 7.5F group (813.93 ± 279.47 mL vs 1504.18 ± 385.31 mL, p = 0.000). The postoperative fever rate in 9.2F group was higher than 7.5F group (20% vs 5%, p = 0.043). There was no significant difference in sepsis (0% vs 2.5%, p = 0.314) between the two groups. No significant difference was noted in hospital stay (0.93 ± 0.49 days vs 1.14 ± 0.64 days, p = 0.099) between the two groups. The final stone-free rate (SFR) in 7.5F group was higher than 9.2F group (95% vs 80%, p = 0.043). Conclusion: The latest 7.5F mini FUS was a reliable instrument in RIRS to keep a good visualization with low requirement of irrigation, low postoperative infection complication, and also a high SFR when compared with the conventional 9.2F FUS. Clinical Trial Registration: NCT05231577.

Pliability in the m6A-Binding Region Extends Druggability of YTH Domains.

Epitranscriptomic mRNA modifications affect gene expression, with their altered balance detected in various cancers. YTHDF proteins contain the YTH reader domain recognizing the m6A mark on mRNA and represent valuable drug targets. Crystallographic structures have been determined for all three family members; however, discrepancies are present in the organization of the m6A-binding pocket. Here, we present new crystallographic structures of the YTH domain of YTHDF1, accompanied by computational studies, showing that this domain can exist in different stable conformations separated by a significant energetic barrier. During the transition, additional conformations are explored, with peculiar druggable pockets appearing and offering new opportunities for the design of YTH-interfering small molecules.

Conheça a prática do Tai Chi Pai Lin | Saúde Zen

A prática do Tai Chi Pai Lin é benéfica tanto para a saúde do corpo quanto para a mente.

Effect of final temperature and heating rate on the mechanical and optical properties of a zirconia veneering ceramic.

PURPOSE: To evaluate the effect of firing temperature and heating rate on the volumetric shrinkage, translucency, flexural strength, hardness, and fracture toughness of a zirconia veneering ceramic. MATERIAL AND METHODS: Zirconia veneering ceramic specimens (N = 45) with varying final temperatures (730 °C, 750 °C, and 770 °C) and heating rates (70 °C/min, 55 °C/min, and 40 °C/min) were fabricated (n = 5). Each specimen's shrinkage, translucency, flexural strength, hardness, and fracture toughness were determined. Two-way analysis of variance, Scheffé test, and Pearson's correlation analysis were used to evaluate data (α = 0.05). RESULTS: The shrinkage (44.9 ± 3.1-47.5 ± 1.6 vol%) and flexural strength (74.1 ± 17.4-107.0 ± 27.1 MPa) were not affected by tested parameters (P ≥ 0.288). The interaction between the main factors affected the translucency, hardness, and fracture toughness of the specimens (P ≤ 0.007). Specimens with 770 °C final temperature and 70 °C/min heating rate had the lowest (21.8 ± 3.2 %) translucency (P ≤ 0.039). The hardness ranged between 4.98 ± 0.51 GPa (730 °C; 70 °C/min) and 5.60 ± 0.37 GPa (770 °C; 70 °C/min). Fracture toughness ranged between 0.54 ± 0.04 MPa√m and 0.67 ± 0.08 MPa√m with the highest values for specimens fired at 730 °C with 70 °C/min (P ≤ 0.001). There was a positive correlation between translucency and hardness (r = 0.335, P = 0.012), and a negative correlation between fracture toughness and all parameters other than shrinkage (translucency: r = -0.693/P < 0.001, flexural strength: r = -0.258/P = 0.046, hardness: r = -0.457/P < 0.001). CONCLUSIONS: Heating rate and final temperature should be considered while fabricating veneered zirconia restorations with tested ceramic as they affected the translucency, hardness, and fracture toughness.

Computational Comparison of the Mechanical Behavior of Aortic Stent-Grafts Derived from Auxetic Unit Cells.

PURPOSE: Inappropriate stent-graft (SG) flexibility has been frequently associated with endovascular aortic repair (EVAR) complications such as endoleaks, kinks, and SG migration, especially in tortuous arteries. Stents derived from auxetic unit cells have shown some potential to address these issues as they offer an optimum trade-off between radial stiffness and bending flexibility. METHODS: In this study, we utilized an established finite element (FE)-based approach to replicate the mechanical response of a SG iliac limb derived from auxetic unit cells in a virtual tortuous iliac aneurysm using a combination of a 180° U-bend and intraluminal pressurization. This study aimed to compare the mechanical performance (flexibility and durability) of SG limbs derived from auxetic unit cells and two commercial SG limbs (Z-stented SG and circular-stented SG models) in a virtual tortuous iliac aneurysm. Maximal graft strain and maximum stress in stents were employed as criteria to estimate the durability of SGs, whereas the maximal luminal reduction rate and the bending stiffness were used to assess the flexibility of the SGs. RESULTS: SG limbs derived from auxetic unit cells demonstrated low luminal reduction (range 4-12%) with no kink, in contrast to Z-stented SG, which had a kink in its central area alongside a high luminal reduction (44%). CONCLUSIONS: SG limbs derived from auxetic unit cells show great promise for EVAR applications even at high angulations such as 180°, with acceptable levels of durability and flexibility.

Effect of glass fiber and nylon fiber reinforcement on the mechanical and thermal properties of styrene butadiene rubber mixed PMMA denture base material.

OBJECTIVES: The present investigation is aimed at evaluating the effect of styrene butadiene rubber, glass fibre, nylon fibre and hybrid reinforcement of glass and nylon fibre with 0.5 and 1.0 wt% on the impact, flexural, and compressive properties. METHODS: A total of 19 groups were formed, including one control group and 18 study groups. All specimens were fabricated according to the standards and tests were performed. The enhancement of strengths were characterised by using scanning electron micrographs, FTIR results, XRD, and DMA tests. The degradability was studied using TGA/DTA analysis. The results were analysed using one-way ANOVA and Dunnett's post hoc multiple comparison test at p ≤ 0.05. RESULTS: The maximum impact, flexural, and compressive strength were found to be 3.234 ± 0.202 kJ/m2, 70.07 ± 0.7 MPa, and 84.929 ± 0.85 MPa for hybrid reinforcement of 0.5 wt% nylon fiber and 0.5 wt% glass fiber with 1.0 wt% of styrene butadiene rubber (SBR) mixed PMMA denture base material. Statistical analysis shows that the maximum mean impact strength, flexural strength, and compressive strength are about 84%, 58%, and 67% higher than the pure PMMA (control group). The maximum flexural modulus and compressive modulus are 914.4 MPa and 407.847 MPa for denture base material made of 1.0 wt% SBR, 1.0 wt% nylon fiber, 0.5 wt% glass fiber, and 0.5 wt% SBR, 0.5 wt% nylon fiber, respectively. The storage moduli of 1.0 wt% SBR, 1.0 wt% nylon fiber, and 0.5 wt% glass fiber-reinforced denture base material and pure PMMA are 0.096 and 0.422 at 79 °C, respectively, which indicates significant crosslinking of fiber and PMMA. The failure surfaces are characterized by a homogeneous distribution of fiber with increased surface roughness and fiber pullout, strong bonding, and well-dispersed SBR.

Efectos del rodillo de espuma o foam roller sobre el rango de movimiento, la flexibilidad, la fuerza y el dolor muscular de inicio retardado en deportistas de alto rendimiento / Effects of the use of foam rollers by high-performance athletes on range of motion, flexibility, strength and delayed onset muscle soreness

Introducción: El rodillo de espuma o Foam Roller (FR) es un instrumento de liberación miofascial autoinducida, para aplicarpresión de forma directa sobre la musculatura diana. FR es ampliamente empelado por deportistas como herramienta deauto-masaje. Objetivo: Evaluar la evidencia actual sobre el impacto del FR, sobre el sistema musculoesquelético, en deportistas, tratandode identificar los mecanismos que influyen sobre los tejidos miofasciales.Material y método: Basándonos en las directrices de los Elementos de Información Preferidos para Revisiones Sistemáticas yMetaanálisis (PRISMA), revisamos sistemáticamente estudios indexados en Web of Science, Cochrane y PubMed, para evaluarlos efectos del FR en el rango articular de movimiento (ROM), la flexibilidad, la fuerza y el dolor muscular de inicio retardado(DOMS) en deportistas de alto rendimiento. Se incluyeron artículos originales publicados desde el 2018 hasta el 30 de septiembre de 2022, con diseño de ensayo controlado o pre-post intervención, en los que se comparó la intervención de FR conun grupo control. Se utilizó la escala PEDro para evaluar de la calidad metodológica.Resultados: Entre los 141 registros identificados en la búsqueda, un total de 10 estudios cumplieron los criterios de inclusióny exclusión. En general, el uso de FR, en los deportistas de alto rendimiento, mostró mejoras significativas sobre el ROM yflexibilidad, y efectos notablemente beneficiosos sobre el DOMS y la fuerza, sin efectos adversos en el tejido miofascial. El FRpuede actuar mejorando la arquitectura tisular miofascial, atenuando el efecto inflamatorio y nociceptivo. Conclusión: El uso FR, parece seguro, es un instrumento efectivo para la mejora de las cualidades físicas de movilidad, fuerzay flexibilidad, y disminuir el DOMS incrementando del rendimiento deportivo.(AU)

Introduction: The Foam Roller (FR) is a self-induced myofascial release instrument to apply pressure directly on the targetmusculature. FR is widely used by athletes as a self-massage tool. Objective: We evaluate the current evidence on the impact of FR on the musculoskeletal system in athletes, trying to identifythe mechanisms that influence myofascial tissues.Material and method: Based on the Preferred Reporting Item Guidelines for Systematic Reviews and Meta-Analyses (PRISMA),we systematically reviewed studies indexed in Web of Science, Cochrane, and PubMed to evaluate the effects of FR on jointrange of motion (ROM), flexibility, strength, and delayed onset muscle soreness (DOMS) in high-performance athletes. Originalarticles published from 2018 through September 30, 2022, with controlled trial or pre-post intervention design, in which theFR intervention was compared to a control group, were included. The PEDro scale was used to assess methodological quality. Results: Among the 141 records identified in the search, a total of 10 studies met the inclusion and exclusion criteria. Ingeneral, the use of FR, in high performance athletes, showed significant improvements on ROM and flexibility, and markedlybeneficial effects on DOMS and strength, with no adverse effects on myofascial tissue. FR may act by improving myofascialtissue architecture, attenuating the inflammatory and nociceptive effect. Conclusion: The use of FR seems to be safe; it is an effective tool for the improvement of the physical qualities of mobility,strength, and flexibility, and to decrease DOMS and increase sports performance.(AU)

Terapia a laser de alta intensidade para rigidez muscular dos isquiotibiais: fundamentação e desenho do estudo para estudo controlado randomizado simples-cego / High-intensity laser therapy for hamstring muscle tightness: rationale and study design for a single-blinded randomized controlled trial

CONTEXTO: Sentar-se por muito tempo e um estilo de vida sedentário podem resultar em encurtamento dos isquiotibiais. Um declínio na atividade física regular pode levar a uma diminuição da flexibilidade do músculo em um adulto mais jovem. Aumentar a flexibilidade dos músculos isquiotibiais pode diminuir as possibilidades de lesões e prevenir a dor lombar. A aplicação da terapia a laser de alta intensidade (TLAI) tem demonstrado inúmeros benefícios para diversas condições. No entanto, até o momento, não hápesquisas publicadassobre a eficácia dessaterapia para melhorar o comprimento dos músculos isquiotibiais em adultos jovens saudáveis. Este artigo descreve o protocolo de estudo para investigar os benefícios do TLAI no tratamento da rigidez muscular dos isquiotibiais em adultos jovens. MÉTODOS: 136 indivíduos jovens saudáveis serão recrutados, pelo método de amostragem intencional, para participar de um estudo randomizado, simplescego e controlado por simulação. Os participantes recrutados serão divididos aleatoriamente em dois grupos, o grupo TLAIativo e o grupo TLAI placebo. A duração do tratamento será de 8 a 10 minutos por sessão em ambos os membros inferiores, em dias alternados, durante duas semanas. O teste de extensão ativa do joelho e o teste de sentar e tocar são as medidas de resultado que serão registradas na linha de base, no final do período pós-intervenção de 2 semanas. O valor de p ≤0,05 será considerado estatisticamente significativo. DISCUSSÃO: Os resultados do estudo fornecerão os dados para determinar se aTLAI seria uma futura intervenção não farmacológica não invasiva para reduzir a tensão muscular dos isquiotibiais em adultos jovens. REGISTRO DE ENSAIO: Registro de Ensaios Clínicos NCT05077761.

BACKGROUND: Prolonged sitting and a sedentary lifestyle may result in hamstring shortness. A decline in regular physical activity could lead to a decrease in the flexibility of the muscle in a younger adult. Increasing hamstring muscle flexibility could decrease the possibility of injuries and prevent low back pain. The application of high-intensity laser therapy (HILT) has proved to be innumerable benefits for many conditions. However, to date, no published research is available on the effectiveness of this therapy in improving hamstring muscle length in healthy young adults. This article describes the study protocol for investigating the benefits of HILT in treating hamstring muscle tightness among young adults. METHODS: 136 healthy young individuals will be recruited, by purposive sampling method, to participate in a randomized, single-blinded, sham-controlled study. Recruited participants will be randomly divided into two groups, the active HILT group, and the sham HILT group. The treatment duration will be 8-10 minutes per session, on both lower limbs, for alternate days a week, for two weeks. The active knee extension test and sit-toe and touch test are the outcome measures that will be recorded at baseline, end of the 2-week post-intervention period. The p-value ≤0.05 will be considered statistically significant. DISCUSSION: The study findings will provide the data to determine whether HILT would be a future non-pharmacological non-invasive intervention to reduce hamstring muscle tightness among young adults. TRIAL REGISTRY: Clinical Trials Registry NCT05077761.

Interoceptive attention facilitates emotion regulation strategy use

Background: Perception of bodily signals—or interoception—has been suggested to facilitate individuals’ habitual use of emotion regulation (ER) strategies and to guide the flexible deployment of specific ER strategies. Previous research has shown that the emotional intensity of stimuli modulates regulatory choice between disengagement (i.e., distraction) and engagement strategies (i.e., reappraisal). Method: This study used experience-sampling methods to investigate the role of interoceptive attention in dynamic changes in ER strategies. Healthy participants first completed one-time measurements of ER strategies, emotional awareness and interoceptive attention in the lab and then reported on negative events and use of strategies including reappraisal and distraction, throughout daily life. Results: Results showed that interoceptive attention was positively associated with habitual use of several ER strategies, and emotional awareness mediated the relations between interoceptive attention and these ER strategies. Results also suggested an interaction between interoceptive attention and intensity of negative events; individuals with higher interoceptive attention used distraction rather than reappraisal only during high intensity negative life events, but those with lower interoceptive attention used more distraction than reappraisal, regardless of event intensity. Conclusions: Overall, these findings suggest interoceptive attention may increase emotional awareness, which in turn facilitates application of certain ER strategies but also the flexible deployment of appropriate strategies tailored to a given situation. Training interoceptive attention may provide a promising way to improve ER and promote mental health. (AU)

Funcionalidad del miembro inferior de los nadadores en relación con el estilo de nado: estudio descriptivo observacional / Functionality of the lower limb of swimmers in relation to swimming style: descriptive observational study

Objetivo: La natación es una disciplina deportiva que requiere de una exigencia funcional por parte de todo el aparato locomotor. A pesar de ser un deporte que se realiza en un entorno sin carga, la participación de los miembros inferiores es imprescindible para el rendimiento del nado. El objetivo principal es determinar si los años de especialización por estilos de nado influyen, o no, en el perfil funcional del miembro inferior de los nadadores. Pacientes y métodos: El estudio se lleva a cabo en 25 nadadores de entre 10 y 19 años pertenecientes a un club de natación español. Los datos a tener en cuenta son: sexo, edad, IMC, estilo predominante, entre otros, además de los valores obtenidos tras la exploración clínica individual, que consta de siete pruebas. Resultados: El estilo de nado en el que el nadador se encuentra especializado no parece influir significativamente sobre la funcionalidad de los miembros inferiores, (p valor mayor a 0.05, Prueba Kruskal-Wallis), valores comprendidos entre 0.13 y 0.87.Conclusión: Se puede concluir que los años de especialización en un estilo de nado concreto, no influyen en el perfil funcional del miembro inferior de los nadadores participantes en este estudio.(AU)

Objective: Swimming is a sports discipline that requires a functional demand from the entire musculoskeletal system. Despite being a sport that takes place in an environment without load, the participation of the lower limbs is essential for swimming performance. The main objective is to determine if the years of specialization by swimming styles influence or not, the functional profile of the lower limb of swimmers. Patients and methods: The study is carried out in 25 swimmers between 10 and 19 years old belonging to a spanish swimming club. The data to take into account are: sex, age, BMI, predominant style, among others, in addition to the values obtained after the individual clinical examination, which consists of seven tests. Results: The swimming style in which the swimmer is specialized does not seems to influence significantly the functionality of the lower limbs, (p-value greater than 0.05, Kruskal-Wallis test), values between 0.13-0.87). Conclusion: It can be concluded that the years of specialization in a specific swimming style do not influence the functional profile of the lower limb of the swimmers participating in this study.(AU)

Influencia de la fase de menstruación y de ovulación en el rango articular de extensión del tobillo y primera articulación metatarsofalángica / Influence of the menstruation and ovulation phase in the extension range of motion of the ankle and first metatarsophalangeal joint

Objetivos: Se trata de un estudio de investigación observacional prospectivo, cuyo objetivo fue valorar si existen diferencias en el rango articular de las articulaciones: tobillo, primera articulación metatarsofalángica del primer dedo durante la fase de ovulación y de menstruación. Pacientes y métodos: Se tomó como muestra a 14 mujeres de 20 a 25 años, que cumplían con los criterios de inclusión. Fueron exploradas en el Área Clínica de Podología de la Universidad de Sevilla por la investigadora del trabajo, reuniendo todos los requisitos de instalaciones y protección de datos para la paciente. Se tomaron dos medidas: durante la ovulación y durante la menstruación. Las propias pacientes informaron de su ciclo menstrual, tras firmar el previo consentimiento informado. Resultados: Tras el análisis estadístico se observó que la flexión dorsal del tobillo, con rodilla extendida y flexionada, y la extensión de la primera metatarsofalángica del primer dedo aumentaron significativamente (p < 0.001 en ambos pies) su rango articular durante la fase de ovulación. Conclusiones: Se han apreciado diferencias en el rango de extensión del tobillo y de la primera articulación metatarsofalángica del primer dedo, siendo mayor el rango en la fase ovulatoria.(AU)

Objective: This is a prospective, observational research study whose objective was to assess whether there are differences in the joint range of the joints: ankle, first metatarsophalangeal of the first toe during the ovulation and menstruation phase. Patients and methods: A sample of 14 women between the ages of 20 and 25, who met the inclusion criteria, were taken as a sample. They were explored in the Podiatry Clinical Area of the University of Seville by the researcher of the work, meeting all the facilities and data protection requirements for the patient. Two measurements were taken, during ovulation and another during menstruation. The patient themselves reported their menstrual cycle after signing the prior informed consent. Results: After the statistical analysis, it was observed that the dorsiflexion of the ankle, with the knee extended and flexed, and the extension of the first metatarsophalangeal of the first toe significantly increased (p < 0,001 in both feet) their joint range during the ovulation phase.Conclusions: Differences have been observed in the range of extensión of the ankle and of the first metatarsophalangeal joint of the first finger, the range being greater in the ovulatory phase.(AU)

A descriptive cross-sectional study on the motivation of work-from-home office workers in the National Capital Region / The Health Sciences Journal

INTRODUCTION@#The landscape of work has changed since the start of the COVID-19 pandemic as more companies shifted from face-to-face to the work-from-home (WFH) setup. This change has affected several aspects of human life especially the motivation to WFH. The study aimed to determine the motivation of WFH among office workers in the National Capital Region (NCR) from March 2020 to February 2022@*METHODS@#Using a descriptive cross-sectional study design, an online survey of WFH office workers around the NCR, Philippines was conducted. A 26-item questionnaire on motivation covering dimensions of availability (flexibility), safety (work-life balance), and meaningfulness (work performance) was used. Data was analyzed using SPSS version 24.@*RESULTS@#A total of 252 respondents were included in the study, with a majority identifying as females aged 21 to 30, never married, and college graduates. Additionally, respondents reported having one to five years of work experience and were employed in professional/technical/managerial fields. Regarding the impact of remote work, the findings indicated that most individuals who worked from home (WFH) felt motivated by this setup due to its positive effects on availability, time and cost savings from reduced commuting, and the flexibility it provided for managing their schedules according to personal preferences. Furthermore, in terms of safety and conducive work environment, WFH office workers expressed agreement that the remote work setup contributed to a favorable work environment, leading to increased job satisfaction. This setup allowed them to effectively balance work responsibilities with personal and family commitments. The study also revealed that WFH office workers perceived a sense of meaningfulness in their work, as they felt trusted and valued by their employers. This sentiment contributed to their overall well-being, both physically and mentally@*CONCLUSION@#Work-from-home office workers are generally always motivated in terms of availability (flexibility), safety (work-life balance) and meaningfulness (work performance).

Bem-estar no trabalho: influência das condições para criatividade entre psicólogos dos Creas-MG / Well-being at work: influence of creativity conditions among CREAS-MG psychologists / Bienestar en el trabajo: influencia de las condiciones para la creatividad entre psicólogos de los centros de referencia especializados en asistencia social en Minas Gerais (CREAS-MG)

Trata-se de estudo quantitativo correlacional com objetivo de testar um modelo em que Bem-Estar no Trabalho (BET) é explicado pelas Condições Favoráveis e Desfavoráveis para a Criatividade no Ambiente de Trabalho de psicólogos que trabalham nos Centros de Referência Especializado de Assistência Social de Minas Gerais. Após a aprovação do Comitê de Ética, contatos dos centros foram localizados via arquivo público digital. O convite foi enviado por e-mail com o link de acesso ao Termo de Consentimento Livre e Esclarecido; Questionário com Dados Demográficos e Funcionais; Escala de Bem-estar no Trabalho; e Indicadores de Condições para Criar no Ambiente de Trabalho. A medida de BET contempla Afeto Positivo, Afeto Negativo e Realização Pessoal e Profissional; enquanto há seis Condições Favoráveis e três Desfavoráveis à Criatividade no Trabalho. As escalas multidimensionais apresentam evidências de validade e resposta Likert de cinco pontos. Os dados foram analisados a partir de estatísticas descritivas e inferenciais, regressão múltipla padrão para teste do modelo e Alfa de Cronbach para verificação da fidedignidade das escalas. A amostra de conveniência contou com 145 psicólogos, majoritariamente mulheres (n=125), com pós-graduação lato senso (n=102) e vínculo estatutário (n=74). As maiores médias encontradas foram Realização Pessoal e Profissional (M=3.47; DP=0.65), Atividades Desafiantes (M=3.50; DP=0.68), e Excesso de Serviços e Escassez de Tempo (M=3.51; DP=0.85). Os resultados apontam que as Condições para a Criatividade no Trabalho contribuem significativamente para as três dimensões de BET, demonstrando a importância de promover um contexto propício à criatividade e ao bem-estar dos trabalhadores.(AU)

This is a quantitative correlational study aiming to test a model in which Well-Being at Work (WBW) is explained by the Favorable and Unfavorable Conditions for Creativity in the Work Environment of psychologists who work in the Specialized Reference Centers for Social Assistance in Minas Gerais (CREAS-MG). After approval by the Ethics Committee, contacts of the centers were located via public digital file. The invitation was sent by e-mail with the link to access the Informed Consent Form; Questionnaire with Demographic and Functional Data; Workplace Well-Being Scale; and Indicators of Conditions for Creating in the Workplace. The WBW measures Positive Affection, Negative Affection, and Personal and Professional Fulfillment; alongside six Favorable Conditions and three Unfavorable Conditions for Creativity at Work. Multidimensional scales provide evidence of validity and a five-point Likert response. Data were analyzed based on descriptive and inferential statistics, standard multiple regression to test the model and Cronbach's Alpha to verify the reliability of the scales. The convenience sample consisted of 145 psychologists, mostly women (n=125), with lato sensu post-graduation (n=102), and statutory employment (n=74). The highest means are Personal and Professional Fullfilment (M=3.47; SD=0.65), Challenging Activities (M=3.50; SD=0.68), and Excessive Services and Shortage of Time (M=3.51; SD=0.85). The results indicate that the Conditions for Creativity at Work significantly contribute to the three dimensions of WBW and demonstrate the importance of promoting a context conducive to creativity and well-being of workers.(AU)

Este estudio cuantitativo correlacional tuvo el objetivo de probar un modelo en el que el bienestar en el trabajo (BET) se explica por las condiciones favorables y desfavorables para la creatividad en el ambiente laboral de los psicólogos que laboran en los Centros de Referencia Especializados en Asistencia Social en Minas Gerais. Tras la aprobación del Comité de Ética, se buscaron los contactos de estos centros en un archivo digital público. La invitación enviada por correo electrónico contenía el enlace para acceder al Formulario de Consentimiento Informado, al Cuestionario con Datos Demográficos y Funcionales, a la Escala de Bienestar Laboral y a los Indicadores de Condiciones para la Creación en el Lugar de Trabajo. La medida BET incluye afecto positivo, afecto negativo y realización personal y profesional; mientras que la otra medida cubre seis condiciones favorables y tres condiciones desfavorables para la creatividad en el trabajo. Las escalas multidimensionales proporcionan evidencia de validez y una respuesta Likert de cinco puntos. Para el análisis de datos se utilizó estadística descriptiva e inferencial, regresión múltiple estándar para probar el modelo y Alfa de Cronbach para verificar la confiabilidad de las escalas. La muestra de conveniencia consistió en 145 trabajadores, en su mayoría mujeres (n=125), con posgrado lato sensu (n=102) y empleo estatutario (n=74). Los promedios más altos son el logro personal y profesional (M=3,47; DE=0,65), las actividades desafiantes (M=3,50; DE=0,68), el exceso de servicios y la escasez de tiempo (M=3,51; DE=0,85). Los resultados indican que las condiciones para la creatividad en el trabajo contribuyen significativamente a las tres dimensiones de BET y demuestran la importancia de promover un contexto propicio para la creatividad y el bienestar de los trabajadores.(AU)