652 research outputs found
Effectiveness of a 5‐week virtual reality versus traditional training on balance and flexibility in healthy adult females
No full textPurpose: This study aimed to investigate the effectiveness of a 5-week virtual reality training protocol on static and dynamic balance and flexibility compared to a traditional training protocol in healthy adult females. Methods: Twenty-one healthy female adults (age, 49.81 ± 2.99 years) were randomly assigned into three groups: Virtual Reality (VR; n = 7) that performed a 5-week exergame training protocol; Traditional Training (TR; n = 7) that performed a specific training protocol on balance, and lower limbs and abdominal strength; and waitlist control group (CG; n = 7) that continued their daily activities without any type of structured physical activity. Static balance was assessed by the ellipse area and statokinesigram parameters (Romberg test, in the open-eye (OE) and closed-eye (CE)), dynamic balance by the star excursion balance test on the right and left leg, and flexibility by the sit and reach test. Results: After the intervention, VR and TR groups showed a significant improvement in static and dynamic balance and flexibility (all p < 0.001) compared to the CG. Compared to TR, the VR training protocol showed greater effect sizes and was more effective in percentage terms on all measured variables, particularly for Sit and Reach (82% vs. 35%), except the OE Area (42% vs. 49%). Conclusions: Findings suggest that both a 5-week VR training protocol and a 5-week TR protocol may significantly improve static and dynamic balance and flexibility in healthy female adults. The VR training protocol showed a greater effect size compared to the TR training protocol, although it was not statistically significant. Future randomized controlled studies with a larger sample size and longer training protocols are needed to confirm this finding
Paralympic Powerlifting as a Sustainable Way to Improve Strength in Athletes with Spinal Cord Injury and Other Disabilities
No full textBackground: in Paralympic Powerlifting (PP), athletes with a spinal cord injury (SCI) and other disabilities (OD) compete together. However, athletes with SCI are at a disadvantage in terms of force production and transfer. Objective: to analyze the strength and the dynamic and static indicators, at different intensities, tied and untied in athletes with SCI and OD. Methods: the sample presented 10 OD (28.30 ± 4.92 years) and 10 SCI (30.00 ± 4.27 years), classified competitors, and eligible to compete in the sport (all males). Maximum isometric force (MIF); time to MIF (Time); rate of force development (RFD); impulse, variability, and fatigue index (FI); and the dynamic tests of Mean Propulsive Velocity (MPV), Velocity Maximum (Vmax), and Power with loads of 40, 60, and 80% of 1 Repetition Maximum (1 RM), respectively. Results: there were no differences between OD and SCI in dynamic and isometric strength indicators. In MPV, there was an 80% difference between tethered and untethered SCI (p = 0.041). In VMax, there were differences in SCI between tethered and untethered, 40% (p = 0.004) and 80% (p = 0.023), respectively. There were no differences in the other intensities. Conclusion: PP training seems to be a sustainable way to promote strength gains in SCI, since there were no differences between athletes with SCI and OD, as practitioners of Paralympic Powerlifting
Effect of Acute Caffeine Supplementation on Dynamic Force Indicators at Different Training Moments in Paralympic Powerlifting
No full textBackground: Several reports have highlighted the beneficial impacts of caffeine on performance in various disciplines of Paralympic Powerlifting (PP), a sport renowned for its emphasis on maximal strength. Moreover, caffeine consumption within the
context of PP has been found to be safe.
Objective: To examine the effects of caffeine intake before, during, and after PP training sessions at national level in Brazil.
Methods: Thirteen male PP athletes competing at national level (31.31 ± 10.13 years, 80.77 ± 22.66 kg) participated in the study.
They were provided with either 9.0 mg/kg of Caffeine Anhydrous (CA) or Placebo (PL) and were evaluated using 45% of their one-repetition maximum (1RM) before and after training sessions, as well as 24 and 48 hours after sessions. Additionally, they performed five sets of five repetitions maximum (5x5), with assessments carried out during the first and fifth sets for all five repetitions. Evaluations focused on Mean Propulsive Velocity (MPV), Maximum Velocity (MaxV), and Power.
Results: No significant differences were observed with 45% 1RM. However, at 80% 1RM, CA demonstrated significant improvement compared to PL during Set 1 and Set 5 (p < 0.05).
Conclusions: CA exhibits promising ergogenic properties, enabling athletes to sustain training intensity throughout the session, even when working with heavier PP loads
On zeros of irreducible characters lying in a normal subgroup
No full text[EN] Let N be a normal subgroup of a finite group G. In this paper, we consider the elements g of N such that x(g)¿0 for all irreducible characters x of G. Such an element is said to be non-vanishing in G. Let p be a prime. If all p-elements of N satisfy the previous property, then we prove that N has a normal Sylow p-subgroup. As a consequence, we also study certain arithmetical properties of the G-conjugacy class sizes of the elements of N which are zeros of some irreducible character of G. In particular, if N=G, then new contributions are obtained.The first author is supported by Proyecto Prometeo II/2015/011, Generalitat Valenciana (Spain). The research of the second author is partially funded by the Istituto Nazionale di Alta Matematica - INdAM. The third author acknowledges the predoctoral grant ACIF/2016/170, Generalitat Valenciana (Spain). The first and third authors are also supported by Proyecto PGC2018-096872-B-I00, Ministerio de Ciencia, Innovacion y Universidades (Spain).Felipe Román, MJ.; Grittini, N.; Sotomayor, V. (2020). On zeros of irreducible characters lying in a normal subgroup. Annali di Matematica Pura ed Applicata (1923 -). 199:1777-1789. https://doi.org/10.1007/s10231-020-00942-1S17771789199Beltrán, A., Felipe, M.J.: Prime powers as conjugacy class lengths of -elements. Bull. Aust. Math. Soc. 69, 317–325 (2004)Beltrán, A., Felipe, M.J., Malle, G., Moretó, A., Navarro, G., Sanus, L., Solomon, R., Tiep, P.H.: Nilpotent and abelian Hall subgroups in finite groups. Trans. Am. Math. Soc. 368, 2497–2513 (2016)Berkovich, Y., Kazarin, L.S.: Indices of elements and normal structure of finite groups. J. Algebra 283, 564–583 (2005)Bianchi, M., Chillag, D., Lewis, M.L., Pacifici, E.: Character degree graphs that are complete graphs. Proc. Am. Math. Soc. 135, 671–676 (2007)Brough, J., Kong, Q.: On vanishing criteria that control finite group structure II. Bull. Aust. Math. Soc. 98, 251–257 (2018)Brough, J.: Non-vanishing elements in finite groups. J. Algebra 460, 387–391 (2016)Dolfi, S., Pacifici, E., Sanus, L., Spiga, P.: On the orders of zeros of irreducible characters. J. Algebra 321, 345–352 (2009)Grüninger, M.: Two remarks about non-vanishing elements in finite groups. J. Algebra 460, 366–369 (2016)Isaacs, I.M.: Character Theory of Finite Groups. Academic Press Inc., London (1976)Isaacs, I.M., Navarro, G., Wolf, T.R.: Finite group elements where no irreducible character vanishes. J. Algebra 222, 413–423 (1999)Malle, G., Navarro, G.: Characterizing normal Sylow -subgroups by character degrees. J. Algebra 370, 402–406 (2012)Malle, G., Navarro, G., Olsson, J.B.: Zeros of characters of finite groups. J. Group Theory 3, 353–368 (2000)The GAP Group: GAP—Groups, Algorithms, and Programming. Version 4.10.0 (2018). http://www.gap-system.or
Inspiratory muscle glycemic threshold in COPD: functional and clinical associations in incremental testing
No full text: It is known that COPD is multifactorial and reduces the function of several body systems; however, its impact on inspiratory muscle metabolism and its possible clinical implications and for inspiratory muscle training are still unclear. Furthermore, the use of the glycemic threshold (GT) of inspiratory muscles as a viable and clinically useful metabolic measure in COPD is not yet addressed in the literature. This study aimed to verify whether there is an association between the GT of inspiratory muscles with Borg, functional capacity (FC) and cardiovascular autonomic balance in COPD. Included patients with COPD under outpatient follow-up and evaluated them using incremental inspiratory muscle testing (IIMT), six-minute walk test (6MWT), and heart rate variability (HRV). The GT of inspiratory muscles was strongly associated with Borg in the IIMT. The strength endurance and aerobic capacity of inspiratory muscles demonstrated by the exhaustion point (EP) and delta GT/EP showed a strong inverse correlation with the cardiovascular autonomic balance demonstrated by the LF/HF ratio. Delta GT/EP also showed an inverse correlation with dyspnea by the mMRC scale and with the final Borg in the 6MWT. The study concluded that the GT and EP of the inspiratory muscles are strongly associated with Borg in individuals with COPD. Furthermore, the aerobic capacity of the inspiratory muscles was strongly associated with dyspnea on exertion and cardiovascular autonomic balance
Does the Level of Training Interfere with the Sustainability of Static and Dynamic Strength in Paralympic Powerlifting Athletes?
No full textBackground: Paralympic powerlifting (PP) presents adaptations that the training tends to provide, mainly concerning the mechanical variables. Objective: Our aim was to analyze mechanical, dynamic and static indicators, at different intensities, on the performance of paralympic powerlifting athletes. Methods: 23 athletes of PP, 11 national level (NL) and 12 regional level (RL) performed dynamic and static tests over a comprehensive range of loads. The study evaluated regional and national level athletes and the influence on the training level on the performance of strength. The study was carried out in four weeks, with the first week to familiarize with the one repetition maximum (1RM), day 1, and there was a 72-h rest and familiarization with dynamic and static tests carried out day 2. In week 2, the 1RM tests were performed (day 1 and 72 h later), and the static tests were performed with a distance of 15 cm from the bar to the chest, with the tests of maximum isometric strength, time to maximum isometric strength, rate of force development (RFD), impulse, variability and fatigue index (IF) taking place on day 2. In weeks three and four dynamic tests were performed, including means propulsive velocity, maximum velocity, power and prediction of one maximum repeat. Results: Differences were found, with better results than for RL in relation to NL in MVP (45%, 55%, and 75% 1RM), in VMax (50%, 55%, 75% and 95% 1RM). In power, the NL had better results (40%, 45%, 50%, 60% and 95% 1RM). Conclusion: RL athletes tend to present better results with regard to velocity, however in power, NL athletes tend to present better performances
History, Changes and Continuities in the Handmade Textiles made by the Ñätho Women of San Felipe de los Alzati, Michoacán
No full textLos bordados otomíes de San Felipe de los Alzati, Michoacán, que forman parte de la vestimenta tradicional, están en proceso de desplazamiento tras el paso de las telas e hilazas comerciales y la ropa del mercado global. El presente artículo da un panorama sobre ya khoti o labores bordadas por mujeres de la comunidad que son hablantes de la lengua hñätho. La historia de los textiles es el hilo que entreteje la memoria y la vida plasmada en lenguaje de los bordados. También se da cuenta aquí de las trasformaciones en la producción de los textiles con relación a la cultura y la lengua hñätho.The Otomi embroidery of San Felipe de los Alzati, which is part of the traditional clothing, are in the gradual displacement after the arrival of the commercial fabrics and thread and the clothing of the global market. This text gives an overview of Ya khoti or embroidered cloths by the women who are speakers of Hñätho Language. The history of textiles is the thread that interweaves memory and life embodied in the embroidery language. We will present the transformations in textiles productions in relation to the culture and Hñätho language.Ávila de, Alejandro (2015). “In octacatl, in machiyotl: dechados de virtud y entereza”. Catálogo de exposición (marzo-agosto de 2015). México: Museo Textil de Oaxaca / Fundación Harp Helú.
Baltazar R. (2015). “La lucha por la tierra entre los otomíes de Michoacán”. En Estudios Agrarios, 21(60), pp. 85-115.
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Gómez, Arturo (2014a). “La producción textil indígena entre los nahuas de Hueyapan, Puebla”. En Alejandro González V. (coord.), Cambio y continuidad en las organizaciones indígenas textiles femeninas (pp. 15-36). México: Conaculta / INAH / Dirección General de Culturas Populares.
________(2014b). “El textil indígena, ni arte ni artesanía… es ciencia”. En Divulgación Uama. Recuperado de: https://ciseiweb.wordpress.com/2015/12/22/el-textil-indigena-ni-arte-ni-artesaniaes-ciencia/
Halbwachs, Maurice (1995). “Memoria colectiva y memoria histórica” (traducción de un fragmento del capítulo II de La mémoire collective, París, 1968). En Reis, 69, pp. 209-219. Recuperado de: http://www.reis.cis.es/REISWeb/PDF/REIS_069_12.PDF
Hekking, Ewald y Dik Bakker (2010). “Tipología de los préstamos léxicos en el otomí de Querétaro: una contribución para el estudio sistemático y comparativo de diversas lenguas representativas del mundo desde un enfoque interlingüístico”. En Ciencia@UAQ, 3(1), pp. 27-47.
Hernández, Luis y Moisés Victoria Torquemada (2010). Diccionario del hñähñu (otomí) del Valle del Mezquital, Estado de Hidalgo. México: Instituto Lingüístico de Verano.
Hobsbawn, Eric (2002) [1983]. La invención de la tradición. Barcelona: Crítica.
Ibarra, C. (2013). “La memoria colectiva como un medio para la historia oral. Experiencia de construcción de la memoria de un barrio obrero en Viña del Mar”. En XIV Jornadas Interescuelas (2 al 5 de octubre del 2013). Mendoza: Departamento de Historia-Facultad de Filosofía y Letras-Universidad Nacional de Cuyo (ponencia).
INEGI (2010). Principales resultados del Censo de Población y Vivienda. Recuperado de: http://www.inegi.org.mx
Inali (2008). “Catálogo de lenguas indígenas nacionales variantes lingüísticas de México con sus autodenominaciones y referencias geoestadísticas”. Diario Oficial de la Federación. México.
________ (2014). Njaua nt'ot'i ra hñähñu: norma de escritura de la lengua hñähñu (otomí) de los estados de Guanajuato, Hidalgo, Estado de México, Puebla, Querétaro, Tlaxcala, Michoacán y Veracruz. México: Inali.
Islas, Bianca Paola (2017). “Vitalidad lingüística del ñathó (lengua otomí) de San Felipe los Alzati, municipio de Zitácuaro, Michoacán”. En Primer Encuentro de Estudios de las Culturas Indígenas ENES-UNAM (3 al 5 de mayo del 2017) (ponencia).
________ (2018a). “Diagnóstico de las condiciones de vitalidad lingüística del hñätho (otomí) de Michoacán, México”. En Congreso Internacional Contacto, Documentación y Revitalización de Lenguas en Desplazamiento en Hispanoamérica: Desafíos en la Diversidad II (26 de febrero al 2 de marzo del 2018). San José: Universidad de Costa Rica (ponencia).
________ (2018b). “Actitudes lingüísticas sobre la lengua hñätho (otomí) de San Felipe de los Alzati, Zitácuaro, Michoacán”. En XII Coloquio de Lingüística en la ENAH (25 al 27 de abril del 2018) (ponencia).
_________ (2018c). “La investigación lingüística y sociolingüística del hñätho u otomí de San Felipe de los Alzati, Michoacán”. En Ciclo de conferencias “El quehacer lingüístico en el INAH, 1968-2018 (50 aniversario de la Dirección de Lingüística del INAH, 17 y 18 de agosto del 2018) (conferencia).
Lastra, Yolanda (2001). San Felipe los Alzati, Zitácuaro, Michoacán. En Yolanda Lastra (coord.), Unidad y diversidad de la lengua: relatos otomíes (pp. 245-276). México: UNAM.
________ (2006). Los otomíes. Su lengua y su historia. México: UNAM.
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Oliveros, Rodolfo (2012). El carnaval otomí, las versiones de la memoria. En C. Paredes y J. Amos M. (coords.). Alzaban banderas de papel. Los pueblos originarios del oriente y la Tierra Caliente de Michoacán (pp. 390-407). México: CDI / Secretaría de Pueblos Indígenas de Michoacán.
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Oliveros, Rodolfo, Bianca Islas, Juan Gallardo, David Figueroa y Daniel Gutiérrez (en revisión). “Diversidad cultural, desigualdad social y discriminación: paradojas y tensiones en pueblos indígenas de Michoacán”.
Pérez-Bustos, Tania (2016). “El tejido como conocimiento, el conocimiento como tejido: reflexiones feministas en torno a la agencia de las materialidades”. Revista Colombiana de Sociología, 39(2), pp. 163-182.
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Sánchez, Y., Pamela Pineda y Bianca Islas (2018). “Ya khoti Ñatho. Los bordados otomíes de San Felipe de los Alzati, Michoacán”. En II Jornada de las Culturas Otomí, Mazahua y Pirinda-matlatzinca de Michoacán (12 y 13 de octubre de 2018). ENES-UNAM / INAH Michoacán / Radio Indigenista XHTUMI (ponencia)
Prime Power Indices in Factorised Groups
No full text[EN] Let the group G = AB be the product of the subgroups A and B. We determine some structural properties of G when the p-elements in A. B have prime power indices in G, for some prime p. More generally, we also consider the case that all prime power order elements in A. B have prime power indices in G. In particular, when G = A = B, we obtain as a consequence some known results.The first author is supported by Proyecto Prometeo II/2015/011, Generalitat Valenciana (Spain), and the second author is supported by Proyecto MTM2014-54707-C3-1-P, Ministerio de Economia, Industria y Competitividad (Spain). The results in this paper are part of the third author's Ph.D. thesis, and he acknowledges the predoctoral grant ACIF/2016/170, Generalitat Valenciana (Spain).Felipe Román, MJ.; Martínez-Pastor, A.; Sotomayor, V. (2017). Prime power indices in factorised groups. Mediterranean Journal of Mathematics. 14(6):1-15. https://doi.org/10.1007/s00009-017-1023-6S115146Amberg, B., Franciosi, S., de Giovanni, F.: Products of Groups. Oxford University Press Inc., New York (1992)Baer, R.: Group elements of prime power index. Trans. Am. Math. Soc. 75, 20–47 (1953)Ballester-Bolinches, A., Cossey, J., Li, Y.: Mutually permutable products and conjugacy classes. Monatsh. Math. 170, 305–310 (2013)Ballester-Bolinches, A., Esteban-Romero, R., Asaad, M.: Products of finite groups, vol. 53 of de Gruyter Expositions in Mathematics, Berlin (2010)Berkovich, Y., Kazarin, L.S.: Indices of elements and normal structure of finite groups. J. Algebra 283, 564–583 (2005)Camina, A.R., Camina, R.D.: Implications of conjugacy class size. J. Group Theory 1(3), 257–269 (1998)Camina, A.R., Shumyatsky, P., Sica, C.: On elements of prime-power index in finite groups. J. Algebra 323, 522–525 (2010)Chillag, D., Herzog, M.: On the length of the conjugacy classes of finite groups. J. Algebra 131, 110–125 (1990)Doerk, K., Hawkes, T.: Finite Soluble Groups, vol. 4 of de Gruyter Expositions in Mathematics, Berlin (1992)Felipe, M.J., Martínez-Pastor, A., Ortiz-Sotomayor, V.M.: On finite groups with square-free conjugacy class sizes. Int. J. Group Theory (to appear)Kurzweil, H., Stellmacher, B.: The theory of finite groups: an introduction. Springer, New York (2004)Liu, X., Wang, Y., Wei, H.: Notes on the length of conjugacy classes of finite groups. J. Pure Appl. Algebra 196, 111–117 (2005
Sports and Special Populations: Training Physiology in Health and Sports Performance
No full textHealth is increasingly being studied, notably concerning preventive measures for health issues [...
Zeros of irreducible characters in factorised groups
No full text[EN] An element g of a finite group G is said to be vanishing inG if there exists an irreducible character of G such that (g)=0; in this case, g is also called a zero of G. The aim of this paper is to obtain structural properties of a factorised group G=AB when we impose some conditions on prime power order elements gAB which are (non-)vanishing in G.The first author is supported by Proyecto PrometeoII/2015/011, Generalitat Valenciana (Spain). The second author is supported by Proyecto MTM2014-54707-C3-1-P, Ministerio de Economia, Industria y Competitividad (Spain), and by Proyecto Prometeo/2017/057, Generalitat Valenciana (Spain). The third author acknowledges the predoctoral grant ACIF/2016/170, Generalitat Valenciana Spain).Sotomayor, V.; Felipe Román, MJ.; Martínez-Pastor, A. (2019). Zeros of irreducible characters in factorised groups. Annali di Matematica Pura ed Applicata (1923 -). 198:129-142. https://doi.org/10.1007/s10231-018-0765-5S129142198Arroyo-Jordá, M., Arroyo-Jordá, P., Martínez-Pastor, A., Pérez-Ramos, M.D.: On conditional permutability and factorized groups. Ann. Mat. Pura Appl. 193, 1123–1138 (2014)Arroyo-Jordá, M., Arroyo-Jordá, P., Pérez-Ramos, M.D.: On conditional permutability and saturated formations. Proc. Edinb. Math. Soc. 54, 309–319 (2011)Ballester-Bolinches, A., Cossey, J., Li, Y.: Mutually permutable products and conjugacy classes. Monatsh. Math. 170, 305–310 (2012)Ballester-Bolinches, A., Esteban-Romero, R., Asaad, M.: Products of finite groups. Vol. 53 of de Gruyter Expositions in Mathematics, Berlin (2010)Bianchi, M., Brough, J., Camina, R.D., Pacifici, E.: On vanishing class sizes in finite groups. J. Algebra 489, 446–459 (2017)Brough, J.: Non-vanishing elements in finite groups. J. Algebra 460, 387–391 (2016)Brough, J.: On vanishing criteria that control finite group structure. J. Algebra 458, 207–215 (2016)Brough, J., Kong, Q.: On vanishing criteria that control finite group structure II. ArXiv (2017). arXiv:1702.03179Camina, A.R., Camina, R.D.: Implications of conjugacy class size. J. Group Theory 1(3), 257–269 (1998)Cossey, J., Li, Y.: On the structure of a mutually permutable product of finite groups. Acta Math. Hungar. 154(2), 525–529 (2018)Cossey, J., Wang, Y.: Remarks on the length of conjugacy classes of finite groups. Commun. Algebra 27, 4347–4353 (1999)Doerk, K., Hawkes, T.: Finite Soluble Groups. Vol. 4 of de Gruyter Expositions in Mathematics, Berlin (1992)Dolfi, S., Pacifici, E., Sanus, L.: Groups whose vanishing class sizes are not divisible by a given prime. Arch. Math. (Basel) 94, 311–317 (2010)Dolfi, S., Pacifici, E., Sanus, L., Spiga, P.: On the orders of zeros of irreducible characters. J. Algebra 321, 345–352 (2009)Felipe, M.J., Martínez-Pastor, A., Ortiz-Sotomayor, V.M.: Square-free class sizes in products of groups. J. Algebra 491, 190–206 (2017)Felipe, M.J., Martínez-Pastor, A., Ortiz-Sotomayor, V.M.: Prime power indices in factorised groups. Mediterr. J. Math. 14(6), article: 225 (2017)Isaacs, I.M.: Character Theory of Finite Groups. Academic Press Inc., London (1976)Isaacs, I.M., Navarro, G., Wolf, T.R.: Finite group elements where no irreducible character vanishes. J. Algebra 222, 413–423 (1999)Malle, G., Navarro, G., Olsson, J.B.: Zeros of characters of finite groups. J. Group Theory 3, 353–368 (2000
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