Browsing by Author "Araya, Felipe"

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    Absence of musculocutaneous nerve associated with the presence of an accessory head of the biceps brachii muscle: report of a bilateral case and its clinical implications
    (2023) Farfán Cabello, Emilio Erasmo; Araya, Felipe; Barroilhet Castillo, Manuel; Cornejo, Francisco; Gutierrez, Agustin; Vergara, Matias; Inzunza Hernández, Oscar Alejandro; Sanchez, Natalia; Tramolao Osses, Jaritza Andrea; Inostroza, Veronica
    The anatomical variants of the biceps brachii muscle (BBM) are frequent, mostly unilaterally than bilaterally, and are associated with supernumerary muscle bellies, the total absence of the muscle or one of its heads, and variations in the points of origin and insertion. In the same way, the variants of the musculocutaneous nerve (MCN) can include alterations in its course, number of branches, or anatomical relations, whereas its absence is considered an atypical variation. The aim of this work was to report the absence of musculocutaneous nerve associated with the presence of one accessory head of the biceps brachii muscle. Dissection of a female cadaver, fixed in 10% buff- ered formaldehyde, which did not present previous surgeries in the studied area was performed. Variations were noted in both upper limbs related to accessory muscle bellies and change in innervation. Anatomical relations of muscles and nerves were determined by following proximal to distal ends, relation, vascularization, and innervation pattern. The absence of MCN associated with the presence of one accessory head of the BBM were found bilaterally. These anatomical variations are atypical. Clinically, these variations can produce compressive symptoms that could generate confusing diagnostics and conduce to unnecessary procedures on the arm, inducing iatrogenic actions.
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    Effectiveness of respiratory muscles training by voluntary isocapnic hyperpnea versus inspiratory threshold loading on intercostales and vastus lateralis muscles deoxygenation induced by exercise in physically active adults
    (2023) Espinosa Ramírez, Maximiliano; Riquelme Sánchez, Santiago; Araya, Felipe; Rodríguez, Guido; Figueroa Martínez, Fernanda; Gabrielli, Luigi; Viscor, Ginés; Reid, W. Darlene; Contreras-Briceño, Felipe; Pontificia Universidad Católica de Chile. Escuela de Medicina
    Tesis conducente al grado de Magíster en Investigación en Ciencias de la Salud. Abstract: Respiratory muscle training (RMT) improves physical performance, although it is still debated whether this effect depends on the type of training. The purpose of this study was to compare the effects of two different types of RMT, i.e., voluntary isocapnic hyperpnea (VIH) and inspiratory threshold loading (ITL), on the deoxygenation of intercostal (∆SmO2-m. intercostales) and vastus lateralis (∆SmO2-m. vastus lateralis) muscles during exercise. Twenty-four participants performed eight weeks of RMT by: (i) VIH (3 days·week−1 for 12 min at 60% maximal voluntary ventilation) or (ii) ITL (5 sets·week−1 of 30 breaths·minute−1 at 60% maximal inspiratory pressure). Cardiopulmonary exercise testing (CPET) included ∆SmO2 (the change from baseline to end of test) of intercostal and vastus lateralis muscles. After RMT, both groups showed decreased ∆SmO2-m. intercostales (VIH = 12.8 ± 14.6%, p = 0.04 (effect size, ES = 0.59), and ITL = 8.4 ± 9.8%, p = 0.04 (ES = 0.48)), without a coincident change of ∆SmO2-m. vastus lateralis. ITL training induced higher VO2-peak absolute values than VIH (mean ∆ post–pre, ITL = 229 ± 254 mL·min−1 [95% CI 67–391] vs. VIH, 39 ± 153 mL·min−1 [95% CI −58–136.0], p = 0.01). In conclusion, both RMT improved the balance between supply and oxygen consumption levels of m. intercostales during CPET, with ITL also inducing an increase of aerobic capacity.
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    Exploring Perceptions toward Emotional Intelligence in Chilean Construction Using a Qualitative Approach
    (2024) Paez, Pedro; Araya, Felipe; Salazar, Luis Arturo; Gimenez, Zulay; Sanchez, Omar; Sierra-Varela, Leonardo; Neculman, Briguitte
    This study aims to analyze the perceptions of construction experts in the Chilean construction industry regarding emotional intelligence. This exploratory and qualitative study is based on data collected through semi-structured interviews with construction professionals. The collected data were analyzed using a qualitative content analysis (QCA) technique to leverage how emotional intelligence (EI) is perceived by professionals in Chilean construction projects. A review, coding, and categorization were carried out within each transcribed interview, which allowed the elaboration of coding dictionaries and corresponding frequency tables to identify emerging topics. Our main results indicate that interviewees perceived EI as a tool to help them face the problems in Chilean construction projects. According to the interviewees, the benefits of implementing EI training are mainly the socio-emotional development and the transfer of critical skills to confront the challenges related to workers' interactions. The main barriers are related to the work culture, lack of awareness of EI among construction workers, economic interests, and gender factors. The literature points to limited studies on understanding emotional intelligence in the construction sector, particularly in South America. This study contributes to responding to the need to explore and provide knowledge on emotional intelligence in the construction sector in the context of a South American country. This study contributes to exploring and understanding how EI is understood among workers in Chilean construction projects. In practicality, construction managers may use our findings to design training programs that leverage EI to improve the management of construction projects.
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    Impacto del entrenamiento respiratorio de hiperpnea isocápnica voluntaria sobre el costo energético asociado a la respiración inducido por ejercicio físico
    (2023) Espinosa Ramírez, Maximiliano; Riquelme Sánchez, Santiago; Araya, Felipe; Rodríguez García, Guido Hernán Antonio; Figueroa Martínez, Fernanda; Contreras Briceño, Felipe
    Objetivo: Determinar el efecto de ocho semanas de entrenamiento por hiperpnea isocápnica voluntaria (HIV) sobre el costo energético asociado a la respiración (COB) reflejado en los cambios en la oxigenación de los músculos intercostales (∆SmO2-m. intercostales) inducida por ejercicio físico de intensidad incremental. Métodos. Doce participantes físicamente activos fueron entrenados durante ocho semanas de HIV 3 días x semana, 12 minutos, al 60% de ventilación voluntaria máxima (VVM). En la semana previa y posterior al entrenamiento HIV se realizó un test cardiopulmonar (CPET) de intensidad incremental en cicloergómetro, durante esta prueba se registró la ∆SmO2-m. intercostales mediante el dispositivo MOXY®. El efecto de HIV sobre la ∆SmO2-m. intercostales se analizó mediante la prueba two-way mixed ANOVA considerando los factores (fase × tarea). Resultados. ∆SmO2-m.intercostales fue significativamente menor a partir del 30% (–5,0±4,7%; p<0.01) hasta el 100% (–10,6±12,8%; p<0.01) de la tarea luego de ocho semanas de HIV. Además, se reportó un aumento de la presión inspiratoria máxima (PIM)=16,5±11,4 cmH2O (p<0.01); y de la resistencia muscular respiratoria=106,6±149,0 s (p<0.01). El tiempo total de ejercicio aumentó en 106,6±149,0 s (p=0.04), así como la carga total en 10,50± 10,12 vatios (p<0.01). Conclusión. El HIV disminuye el COB inducido por ejercicio incremental asociado a un incremento en la performance física y de los músculos respiratorios. En futuros estudios se sugiere estudiar esta estrategia de entrenamiento analítico de los músculos respiratorios en usuarios con limitación física relacionada al aumento prematuro del COB.