RESUMO Introdução: O cérebro humano controla o equilíbrio do corpo, agindo sobre seus tecidos musculares e, assim, controlando o equilíbrio de seu centro de gravidade. Objetivo: Analisar seis indicadores que afetam a capacidade do cérebro de controlar o equilíbrio do corpo, avaliar áreas musculares relevantes do corpo humano, e provar que atividade física voltada à força pode melhorar o equilíbrio do corpo. Métodos: Esse artigo selecionou como amostra jovens estudantes universitários com preparo físico similar, e analisou quais fatores afetam de maneira relevante a força e o equilíbrio do corpo por meio de modelos estatísticos. Resultados: Treinamentos de força podem efetivamente melhorar o equilíbrio do corpo quando de pé. Conclusão: Treinar o cérebro para controlar o corpo significa, principalmente, treinar a força, a estabilidade, o equilíbrio, e outras capacidades dos tecidos musculares humanos. O uso dessa metodologia de atividade física pode efetivamente aprimorar a estabilidade do corpo humano. O treinamento direcionado também pode melhorar a capacidade do cérebro de controlar o equilíbrio do corpo. Nível de evidência II; Estudos terapêuticos – investigação do resultado de tratamentos.

ABSTRACT Introduction: The human brain controls the body's balance, actinh on the muscle tissues of the body and thus controlling the balance of its center of gravity. Objective: To analyze 6 indicators that affect the brain's ability to control the body's balance and to verify the important muscle areas of the human body and prove that strength training can help improve the body's balance ability. Methods: This article selected young university students with the same physical fitness as sample and analyzed the factors that affect the body's strength and balance using statistical models. Results: Strength training can effectively improve the body›s balance when standing. Conclusion: Training the brain to control the body is mainly to exercise strength, stability, balance, and other abilities of human muscle tissue. Using this kind of exercise method can effectively improve the stability of the human body. Targeted training can also enhance the brain's ability to control the balance of the body. Level of evidence II; Therapeutic studies - investigation of treatment results.

RESUMEN Introducción: El cerebro humano controla el equilibrio del cuerpo, actuando sobre sus tejidos musculares y, así, controlando el equilibrio de su centro de gravedad. Objetivo: Analizar seis indicadores que afectan la capacidad del cerebro de controlar el equilibrio del cuerpo, evaluar áreas musculares relevantes del cuerpo humano y probar qué actividad física centrada en la fuerza puede mejorar el equilibrio del cuerpo. Métodos: Este artículo seleccionó como muestra jóvenes estudiantes universitarios con preparación física similar y analizó cuáles factores afectan de manera relevante la fuerza y el equilibrio del cuerpo por medio de modelos estadísticos. Resultados: Entrenamientos de fuerza pueden efectivamente mejorar el equilibrio del cuerpo al estar de pie. Conclusión: Entrenar el cerebro para controlar el cuerpo significa, principalmente, entrenar la fuerza, la estabilidad, el equilibrio y otras capacidades de los tejidos musculares humanos. El uso de esta metodología de actividad física puede, efectivamente, mejorar la estabilidad del cuerpo humano. El entrenamiento dirigido también puede optimizar la capacidad del cerebro de controlar el equilibrio del cuerpo. Nivel de evidencia II; Estudios terapéuticos – investigación del resultado de tratamientos.

SnO2 nanofibers were fabricated by calcination of the electrospun PVP/SnCl4 composite nanofibers. For the first time, SnS nanofibers and SnSe nanofibers were successfully synthesized by double-crucible sulfurization and selenidation methods via inheriting the morphology of SnO2 nanofibers used as precursors, respectively. X-ray diffraction (XRD) analysis shows SnS nanofibers and SnSe nanofibers are respectively pure orthorhombic phase with space group of Pbnm and Cmcm. Scanning electron microscope (SEM) observation indicates that the diameters of SnS nanofibers and SnSe nanofibers are respectively 140.54±12.80 nm and 96.52±14.17 nm under the 95 % confidence level. The photocatalytic activities of samples were studied by using rhodamine B (Rh B) as degradation agent. When SnS or SnSe nanofibers are employed as the photocatalysts, the respective degradation rates of Rh B solution under the ultraviolet light irradiation after 200 min irradiation are 92.55 % and 92.86 %. The photocatalytic mechanism and formation process of SnS and SnSe nanofibers are also provided. More importantly, this preparation technique is of universal significance to prepare other metal chalcogenides nanofibers.

In order to develop new-typed multifunctional composite nanofibers, PANI/Fe3O4/PVP flexible bifunctional composite nanofibers with simultaneous electrical conduction and magnetism have been successfully fabricated via a facile electrospinning technology. Polyvinyl pyrrolidone (PVP) is used as a matrix to construct composite nanofibers containing different amounts of polyaniline (PANI) and Fe3O4 nanoparticles (NPs). The bifunctional composite nanofibers simultaneously possess excellent electrical conductivity and magnetic properties. The electrical conductivity reaches up to the order of 10-3 S · cm-1. The electrical conductivity and saturation magnetization of the composite nanofibers can be respectively tuned by adding various amounts of PANI and Fe3O4 NPs. The obtained electricity-magnetism bifunctional composite nanofibers are expected to possess many potential applications in areas such as electromagnetic interference shielding, special coating, microwave absorption, molecular electronics and future nanomechanics. More importantly, the design concept and construct technique are of universal significance to fabricate other bifunctional one-dimensional nanostructures.