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PURPOSE: Considering the conceptual migration from vocal load and vocal loading to vocal demand and vocal demand response, this review of literature aimed to identify physiological explanations, reported measurements, and associated factors (vocal demands) reported in the literature when considering the phonatory response to a vocal demand. METHODS: A systematic review of literature, following the PRISMA Statement, was conducted using Web of Science, PubMed, Scopus, and ScienceDirect. Data were analyzed and presented in two parts. First, a bibliometric analysis, co-occurrence analysis, and content analysis were performed. Three criteria that got article inclusion were defined: (1) written in English, Spanish, and Portuguese; (2) published between 2009 and 2021; and (3) focused on vocal load and loading, vocal demand response, and voice assessment parameters. A total of 54 publications met the criteria and were included in this review. The second part included a conceptual framework based on the content analysis of three aspects of vocal demand response: (1) physiological explanations, (2) reported measurements, and (3) vocal demands. RESULTS AND CONCLUSION: As would be expected since vocal demand response is a relatively new term and not yet commonly used in literature when discussing way that the speakers respond to communicative scenarios, most of the studies reviewed (both historical and recent) still use the term of vocal load and vocal loading. Although there is a broad variety of literature discussing a wide range of vocal demands and voice parameters used to characterize the vocal demand response, results show that there is consistency across the studies. While vocal demand response is unique and intrinsic to the talker, associated factors that contribute to this response include both internal talker and external talker factors. Internal factors include muscle stiffness, viscosity in the phonatory system, vocal fold tissue damage, elevated sound pressure levels during occupational voice demands, extended periods of voice use, suboptimal body posture, difficulties in breathing technique, and sleep disturbances. Associated external factors include the working environment (noise, acoustics, temperature, humidity). In conclusion, although vocal demand response is intrinsic to the speaker, the speaker's response is affected by external vocal demands. However, due to the wide methods to evaluate vocal demand response, it has been difficult to establish its contribution to voice disorders in the general population and, specifically, among occupational voice users. This literature review identified commonly reported parameters and factors that may help clinicians and researchers define vocal demand response.

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PURPOSE: The present study aimed at assessing the efficacy of remote voice therapy (telepractice) implemented with Shaker Medic Plus device in subjects with vocal fatigue. METHOD: Thirty-six participants were initially enrolled in this study. Twenty-four participants with vocal fatigue were finally randomly assigned to one of two treatment groups: (a) voice treatment with Shaker Medic Plus device plus vocal hygiene program (n = 12) and (b) voice treatment with water resistance therapy (WRT) plus vocal hygiene program (n = 12). Laryngoscopic assessment was conducted on all subjects. Before and after voice therapy, participants underwent (a) self-assessment of voice: Vocal Fatigue Index and Vocal Tract Discomfort Scale and (b) instrumental assessment with aerodynamic, acoustic, and electroglottographic measures. The treatment period included six voice therapy sessions within 6 weeks. Each session lasted 30 min. For both groups, exercises consisted of a sequence of nine phonatory tasks performed with Shaker Medic Plus (experimental group) and WRT (control group). Comparisons for all variables were performed between the experimental group and control group. RESULTS: Significant improvements were found for self-reported variables when comparing pre- and postmeasures for both groups. No significant differences were found when comparing groups. No significant main effects or interactions were observed for any of the observed instrumental variables. CONCLUSIONS: Remote physiologic voice therapy with Shaker Medic Plus device and water resistance therapy seem to be both effective to improve voice in subjects diagnosed with vocal fatigue. No differences should be expected between these therapeutic protocols when treating patients with vocal fatigue. Moreover, both are effective at reducing tiredness of voice, voice avoidance, physical discomfort associated with voicing, subjective perception of sensory discomfort in throat, and reduction of physical, emotional, and functional impact of voice problems.

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The effect of ethyl-4-bromophenyl carbamate on different Rhipicephalus microplus stages implanted in cattle was evaluated using the pen test with infestation chambers. Twelve steers were distributed into four groups (n = 3), each with four chambers (12 chambers per group), where approximately 1,000 R. microplus larvae were placed in each chamber. The chambers of the first group were sprayed with a solution of ethyl-4-bromophenyl carbamate (0.668 mg/mL) on day 2 post-infestation (PI) (exposed larvae). The chambers of the second group were sprayed with the same solution on day 8 PI (exposed nymphs), and the chambers of the third group were sprayed on day 16 PI (exposed adults) with the same solution. The chambers of the fourth group were used as controls. The percentages of engorged females, egg laying, egg production and egg hatching were evaluated in all groups. The percentage of cumulative reduction of hatched larvae was 98.3, 96.1 and 94.4% when larvae, nymph and adult stages were treated, respectively. The average cumulative reduction of hatched larvae, considering the three treated stages, was 96.3%, whereby the reproductive potential of this tick was drastically reduced. In conclusion, ethyl-4-bromophenyl carbamate acted as an ixodicide (lethal effect) when larval stages were sprayed and as a growth regulator when nymphal and adult stages were sprayed. The sum of these effects had a direct impact on the efficacy of the product in the pen test, and future studies will indicate the potential use of this product for tick control.

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The effect of experimental infection by Taenia hydatigena metacestodes on different productive parameters in sheep was evaluated. Seventeen male Columbia lambs distributed in three groups were used. The lambs of the first group (n = 5) were orally inoculated with 1000 T. hydatigena eggs (low dose). The lambs of the second group (n = 5) were inoculated orally with all the eggs of the last proglottid of an adult cestode (high dose). The lambs of the third group (n = 7) only received a placebo and were used as a control group. All lambs were humanely euthanized at week 13 postinfection, and carcass yield and conformation were evaluated. The infection rates of the lambs from the high-dose infected group and the low-dose infected group were 100% and 40%, respectively, with a mean of 2.4 ± 0.6 and 1 ± 0.7 metacestodes of T. hydatigena in the abdominal cavity, respectively. In a first multivariate study (MANOVA) considering the under the curve (AUC) values of body condition, weight gain, and feed consumption, as well as the final feed conversion values, showed a highly significant (p < 0.0001) group effect (high dose/low dose/uninfected). In a second multivariate study (MANOVA) considering the AUC values of eosinophils blood count, packed cell volume and alkaline phosphatase showed a highly significant (p < 0.0001) group effect (high dose/low dose/uninfected). The increase in serum ALP is a consequence of liver damage that had a strong negative correlation (r = -0.63, p < 0.007) with the body condition of the lambs. Despite these findings, we did not observe obvious clinical manifestations in any of the infected lambs. In general, no differences (p > 0.1) were observed between the lambs of the control group and the lambs of the low-dose infected group in the parameters evaluated. The results of this study show that the infection of T. hydatigena metacestodes subclinically produces a decrease in productive efficiency, alterations of some hematological and biochemical values, and a slight deterioration in the general appearance of the infected lambs. The above aspects are rarely detected by most farmers, but they have a negative impact on the productivity of infected lambs.

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A balanced and varied diet provides diverse beneficial effects on health, such as adequate micronutrient availability and a gut microbiome in homeostasis. Besides their participation in biochemical processes as cofactors and coenzymes, vitamins and minerals have an immunoregulatory function; meanwhile, gut microbiota and its metabolites coordinate directly and indirectly the cell response through the interaction with the host receptors. Malnourishment is a crucial risk factor for several pathologies, and its involvement during the Coronavirus Disease 2019 pandemic has been reported. This pandemic has caused a significant decline in the worldwide population, especially those with chronic diseases, reduced physical activity, and elder age. Diet and gut microbiota composition are probable causes for this susceptibility, and its supplementation can play a role in reestablishing microbial homeostasis and improving immunity response against Coronavirus Disease 2019 infection and recovery. This study reviews the role of micronutrients and microbiomes in the risk of infection, the severity of disease, and the Coronavirus Disease 2019 sequelae.

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PURPOSE: The present study aimed to obtain the cross-culturally-adapted Chilean version of the voice activity and participation profile - VAPP. METHODS: The process began a with translation of the original English version of the VAPP instrument into Spanish, carried out by two bilingual speech-language pathologists (SLP), followed by a back-translation from a third SLP who was unbiased by the previous stages. A committee of 5 SLP with experience in the area of voice compared the original version, the back translation, and the translated version, seeking divergences and discrepancies between the three versions. A consensus was reached, and they renamed the protocol "Perfil de Participación y Actividad Vocal (PPAV-CL)", with 28 questions which were answered using a visual analog scale (VAS) of 100 millimeters in length. In the process of making the cross-cultural equivalence, the protocol was applied to 24 subjects with voice disorders. For each question, the option of "Not applicable" was added to the answer choices for identification of the questions not comprehended or not appropriate for the target population. None of the subjects under assessment had difficulty answering the questions, therefore it was unnecessary to modify the translation of any of them. The final version of the PPAV-CL shows the appropriate characteristics to be understood. RESULTS: The PPAV-CL instrument reflects the original English version in the number of questions and items. CONCLUSION: a cultural equivalence of the VAPP to Chilean Spanish was achieved. The validation of the PPAV-CL is currently underway.

OBJETIVO: Obtener la equivalencia cultural de la versión chilena del Protocolo VAPP, por medio de su adaptación cultural y lingüística. MÉTODO: El proceso se inicia con la traducción del instrumento original del VAPP realizada por dos Fonoaudiólogos bilingües. Seguido de una retro traducción al inglés por una tercera Fonoaudióloga quien no presenta sesgos de etapas previas. Un comité conformado por 5 Fonoaudiólogos con experiencia en el área de la voz comparó la versión original, retro traducida y traducida, buscando divergencias y discrepancias entre las tres versiones. Llegando a un consenso, el protocolo se tituló "Perfil de Participación y Actividad Vocal (PPAV-CL)", con 28 preguntas, las cuales son consignadas con escala analógica visual (EAV) de 100 milímetros de largo. Durante el proceso de equivalencia cultural, se aplicó el protocolo a 28 sujetos con trastornos de voz. En cada pregunta, se adicionó la opción "No aplicable" como respuesta, con el objetivo de identificar preguntas incomprendidas o inadecuadas del grupo albo. Ninguno de los sujetos evaluados tuvo dificultad en responder las preguntas, por lo cual no fue necesario modificar la traducción de ninguna de ellas. La versión final del protocolo PPAV-CL presenta las características adecuadas en su comprensión. RESULTADOS: El instrumento PPAV-CL refleja la versión original en inglés, en número de preguntas e ítems. CONCLUSION: Se logró equivalencia cultural de VAPP para el español chileno (PPAV-CL). La validación del PPAV-CL está actualmente en curso.

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Resumen El conocimiento de la biodiversidad en un área natural protegida es fundamental para el desarrollo de acciones para su manejo y conservación. El objetivo del presente trabajo fue determinar los patrones de riqueza, categorías de endemismo, así como el estatus de conservación y vulnerabilidad de las aves en la Reserva de la Biosfera Sierra del Abra Tanchipa, ubicada en el noreste del estado de San Luis Potosí, México. Se incluye la información generada por el programa de monitoreo comunitario de aves y otros esfuerzos de muestreo realizados en el área. Se desarrolló trabajo de campo con base en el método de censado de conteo por puntos, los cuales fueron establecidos a lo largo de transectos en el área de estudio. Se registraron 279 especies de aves pertenecientes a 23 órdenes y 54 familias, correspondiendo el mayor porcentaje a las especies residentes permanentes (64.16 %). Del total de especies reportadas, 37 se encuentran bajo alguna categoría de riesgo y 25 presentan alguna categoría de endemismo. El 54.12 % de las especies tienen afinidad neotropical, 26.88 % neártica y 19 % neártica/neotropical. Por otro lado, alrededor del 22.22 % de las aves registradas tienen un nivel de sensibilidad al disturbio de medio a alto, que puede incrementarse debido a los cambios en los hábitats generados por las actividades humanas en la zona de influencia de la reserva. Los monitores comunitarios aliados al programa contribuyeron significativamente en las actividades de campo y la difusión de las acciones orientadas al conocimiento de las aves en la reserva. Los datos obtenidos permiten actualizar la información en el programa de manejo del área natural protegida de la reserva, lo que favorecerá la conservación de las aves en la zona.

Abstract Knowledge about biodiversity in a natural protected area is essential for the development of actions for its management and conservation. The objective of this work was to determine the richness patterns, endemism categories, as well as the conservation and vulnerability status of birds in the Sierra del Abra Tanchipa Biosphere Reserve, located in the northeastern region of the state of San Luis Potosí, Mexico. The information generated by the community bird monitoring program and other sampling efforts in the area was included. Fieldwork was carried out based on the census method of counting by points established along transects in the study area. A total of 279 bird species belonging to 23 orders and 54 families were registered, of which the highest percentage are permanent resident species (64.16 %). Of the species recorded, 37 are under some risk category, and 25 species have some endemism category. 54.12 % of the species have a Neotropical affinity, 26.88 % a Nearctic one, and 19 % a Nearctic/Neotropical one. On the other hand, around 22.22 % of the registered birds have a medium to high sensitivity to disturbance, which may increase due to changes in habitats generated by human activities in the reserve's area of influence. The community allies linked to the monitoring program contributed significantly to the field activities and the dissemination of the actions aimed at bird awareness in the reserve. The obtained data allow the updating of information in the management program of the natural protected area, which will favor the birds' conservation in the zone.

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The expression patterns of some cytokines were compared by RT-qPCR between lambs with and without Taenia hydatigena larvae vesicular concentrate (ThLVC) administration and subsequent infection with Haemonchus contortus. Lambs that received ThLVC prior to infection with H. contortus showed lower (p < 0.03) cumulative FEC (AUC = 18450 ± 3384) than infected lambs who did not receive ThLVC (AUC = 31081 ± 3277). Lambs infected with H. contortus, in general, overexpressed Th1 and Th2 cytokines in abomasal mucosa and abomasal lymph nodes, which seems to indicate a generalized and nonpolarized activation of the immune response by H. contortus. The main immunomodulatory effects of ThLVC were observed in the abomasal fundic region. The lambs that were given ThLVC prior to infection strongly overexpressed most of the studied cytokines representing the Th1 (IFNγ and IL2) and Th2 profiles (IL4, IL5, IL6 and IL10), proinflammatory cytokines (SOD1 and PRDX6) and IgE receptor; in contrast, lambs that were infected but did not receive ThLVC only moderately overexpressed IFNγ, IL4 and IL6. The absence of the significant overexpression of cytokines in lambs that only received ThLVC suggests that this derived from T. hydatigena does not have a stimulating effect per se; however, the presence of H. contortus did produce the highest expression (p < 0.01) cytokine profile among lambs that received ThLVC prior to infection compared to those who did not receive it, so its effect seems to be immunomodulatory and not only immunostimulatory.

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Introducción. Los ejercicios de tracto vocal semiocluido (ETVSO) son herramien-tas utilizadas en la rehabilitación fisiológica de la voz. Los ETVSO son ejercicios vocales producidos por la semioclusión del tracto vocal, a través de una serie de posturas que buscan alargar y/o ocluir el tracto vocal, generando un cambio en el patrón vibratorio de los pliegues vocales, grado de aducción y el patrón respiratorio. Los ETVSO pueden dividirse, según el tipo de semioclusión, en sostenida, transitoria y oscilatoria, así como en ejercicios de mayor resistencia a menor resistencia.Objetivo. Describir los diferentes tipos de ejercicios de tracto vocal semiocluido, el tipo de semioclusión, el grado de resistencia y sus efectos en los pliegues vocales, patrón respiratorio y configuración del tracto vocal. Metodología. Se realizó una revisión de la literatura en las bases de datos PubMed, Medline y Science Direct, usando los siguientes términos: "Semi-Occluded Vocal Tract Postures", "tract vocal semiocclude" y "ejercicios de tracto vocal semiocluido". Se utilizaron operadores booleanos "AND" y "OR" para especificar la búsqueda.Resultados. Los beneficios de estos ejercicios impactan positivamente en variables aerodinámicas, en la función glótica y en la configuración del tracto vocal. Conclusiones. Los ejercicios de tracto vocal semiocluido son una familia de ejerci-cios vocales producidos por semioclusión sostenida, transitoria y oscilatoria del tracto vocal, a través de una serie de posturas que buscan alargar y/o ocluir el tracto vocal, cuyos beneficios impactan positivamente los pliegues vocales y el tracto vocal

Introduction. Semi-occluded vocal tract exercises (SOVTE) are tools used in physiologic voice rehabilitation. Semi-occluded vocal tract exercises are vocal exer-cises produced by the semi-occlusion of the vocal tract through a series of postures that seek to lengthen and/or occlude the vocal tract, generating a change in the vibratory pattern of vocal folds, degree of vocal folds adduction, and the respira-tory pattern. SOVTE can be divided, according to the type of semi-occlusion, into sustained, transient and oscillatory, as well as exercises with high and low degree of airflow resistance.Objective. To describe the different types of semi-occluded vocal tract exercises, the type of semi-occlusion, the type of resistance, and their effects on the vocal folds, respiratory pattern, and configuration of the vocal tract.Methodology. A literature review was performed in the PubMed, Medline, and Science Direct databases, using the following terms: "Semi-occluded vocal tract pos-tures", "Semi-occluded vocal tract" and "Semi-occluded vocal tract exercises". Boo-lean operators "AND" and "OR" were used to specify the search.Results. The benefits of these exercises positively impact aerodynamic variables, glottal function, and configuration of the vocal tract.Conclusions. The semi-occluded vocal tract exercises are a family of vocal exerci-ses produced by the sustained, transitory, and oscillatory semi-occlusion of the vocal tract, through a series of postures that seek to lengthen and/or occlude the vocal tract, whose benefits positively impact on vocal folds and vocal tract.

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RESUMEN Objetivo Obtener la equivalencia cultural de la versión chilena del Protocolo VAPP, por medio de su adaptación cultural y lingüística. Método El proceso se inicia con la traducción del instrumento original del VAPP realizada por dos Fonoaudiólogos bilingües. Seguido de una retro traducción al inglés por una tercera Fonoaudióloga quien no presenta sesgos de etapas previas. Un comité conformado por 5 Fonoaudiólogos con experiencia en el área de la voz comparó la versión original, retro traducida y traducida, buscando divergencias y discrepancias entre las tres versiones. Llegando a un consenso, el protocolo se tituló "Perfil de Participación y Actividad Vocal (PPAV-CL)", con 28 preguntas, las cuales son consignadas con escala analógica visual (EAV) de 100 milímetros de largo. Durante el proceso de equivalencia cultural, se aplicó el protocolo a 28 sujetos con trastornos de voz. En cada pregunta, se adicionó la opción "No aplicable" como respuesta, con el objetivo de identificar preguntas incomprendidas o inadecuadas del grupo albo. Ninguno de los sujetos evaluados tuvo dificultad en responder las preguntas, por lo cual no fue necesario modificar la traducción de ninguna de ellas. La versión final del protocolo PPAV-CL presenta las características adecuadas en su comprensión. Resultados El instrumento PPAV-CL refleja la versión original en inglés, en número de preguntas e ítems. Conclusion Se logró equivalencia cultural de VAPP para el español chileno (PPAV-CL). La validación del PPAV-CL está actualmente en curso.

ABSTRACT Purpose The present study aimed to obtain the cross-culturally-adapted Chilean version of the voice activity and participation profile - VAPP. Methods The process began a with translation of the original English version of the VAPP instrument into Spanish, carried out by two bilingual speech-language pathologists (SLP), followed by a back-translation from a third SLP who was unbiased by the previous stages. A committee of 5 SLP with experience in the area of voice compared the original version, the back translation, and the translated version, seeking divergences and discrepancies between the three versions. A consensus was reached, and they renamed the protocol "Perfil de Participación y Actividad Vocal (PPAV-CL)", with 28 questions which were answered using a visual analog scale (VAS) of 100 millimeters in length. In the process of making the cross-cultural equivalence, the protocol was applied to 24 subjects with voice disorders. For each question, the option of "Not applicable" was added to the answer choices for identification of the questions not comprehended or not appropriate for the target population. None of the subjects under assessment had difficulty answering the questions, therefore it was unnecessary to modify the translation of any of them. The final version of the PPAV-CL shows the appropriate characteristics to be understood. Results The PPAV-CL instrument reflects the original English version in the number of questions and items. Conclusion a cultural equivalence of the VAPP to Chilean Spanish was achieved. The validation of the PPAV-CL is currently underway.

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