Examinando por Autor "Mahecha-Matsudo, Sandra"
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Ítem Effects of a Concurrent Training Protocol on Body Composition and Phase Angle in Physically Inactive Young Women: A Quasi-Experimental Intervention Study(Universidad de la Frontera, 2021-12) Hernández-Jaña, Sam; Abarca-Moya, Diego; Cid-Pizarro, Ítalo; Gallardo-Strelow, José; González-Pino, Yovanni; Zavala-Crichton, Juan Pablo; Olivares-Arancibia, Jorge; Mahecha-Matsudo, Sandra; Yáñez-Sepúlveda, RodrigoTo determine the effect of a concurrent training program on body composition and phase angle in young women. 38 women (19.26 ± 1.86 years) participated in the study, and were assigned according to convenience sampling into two groups: 11 into the control group (CG) and 27 into the intervention group (IG). The IG performed a 12-weeks concurrent training protocol. The frequency was five days a week, and the intensity was established in 40-60 % of a repetition maximum to strength exercise, and 40-65 % heart rate reserve to endurance exercise. Body composition and phase angle were evaluated by bioelectrical impedance before and after the intervention. The IG had a decrease in fat mass (pre = 24.66 ± 5.65 kg; post = 20.38 ± 4.20 kg; Cohen’s d = .80; p< 0,001 [CI 95 % = 3.34,5.22]), and an increase in muscle mass (pre = 22.75 ± 3.23 kg; post: 23.50 ± 3.41 kg; Cohen’s d = -0.86; p= <0,001[CI 95 % = -1.09,- 0.40]) and total phase angle (pre = 5.72º ±0.39; post: 6.24º ± 0.51; Cohen’s d = -1.32; p=<0,001 [CI 95 % = -0.67,-0.36]), whereas the CG had not show significant variations in variables of body composition or total phase angle. The results suggest that a 12-weeks concurrent training program could modify positively the young women’s body composition and phase angle. Hence, it is recommended using similar protocols to change variables related to young women’s health.Ítem Effects of Bone-Patellar Tendon-Bone Autograft on Joint Position and Strength in Patients with Anterior Cruciate Ligament Reconstruction(Universidad de la Frontera, 2022) Álvarez-Ortiz, Isabel; Silvestre, Rony; Mahecha-Matsudo, Sandra; Morán-Bravo, Matías; Morales-Zuñiga, Jorge; Yáñez-Sepúlveda, RodrigoThe aim of the study was to compare the proprioceptive deficit through the Joint position sense (JPS) and Force steadiness in patients with anterior cruciate ligament (ACL) bone-patellar tendon-bone graft (PTH) reconstruction 6 to 12 months post-surgery. Fifteen patients (13 men and 2 women, 25.5 ± 1.3 years) with ACL reconstruction with HTH autograft and 20 persons without ACL injury (19 men and 1 woman, 24.1 ± 0.8 years) participated. To assess knee joint position sensation, Joint position sense (JPS) was measured in three ranges: 0°-30°, 31°-60° and 61°-90° and quadriceps strength sensation was assessed with the Force steadiness (FS) test at 15 % of maximal voluntary contraction (MVC), both tests performed 6 to 12 months post surgery. The results showed that there were no statistically significant differences in joint position sensation (JPS 0°-30°) (p=0.564) and 31°-60° (p=0.681), while in the range 61°-90° (p=0.003) there were statistically significant differences. In the quadriceps strength sensation measurements (FS at 15 % CVM) between the patients operated on ACL HTH technique and the control group there were no statistical differences (p= 0.987). The quadriceps strength sensation measured with the FS test at 15 % CVM would not present a deficit between 6 to 12 months in post-operated ACL patients when compared to subjects without injury or surgery of this ligament. It is concluded that the joint position sensation measured with the JPS test in three joint ranges of patients with ACL reconstruction HTH graft 6 to 12 months post surgery only showed alterations in the range of 61°-90° when compared to the control group, indicating that the joint position sensation presents a deficit in this specific range. © 2022, Universidad de la Frontera. All rights reserved.Ítem Physical activity levels and sedentary behaviour according to sex, age, BMI, academic year, and country among medical students in Latin America(BMC Public Health, Volume 24, Issue 1 December 2024 Article number 1699, 2024-12) Herreros-Irarrázabal, Diego; Herreros-Irarrázabal D.; González-López, María Fernanda; Nuche-Salgado, Rocío; de Souza-Lima, Josivaldo; Mahecha-Matsudo, SandraPhysical inactivity represents a global challenge in public health, being the second most significant factor contributing to mortality. In Latin America, the prevalence of physical inactivity and sedentary behaviour is notable, affecting medical students as well, who play a crucial role as behavioural role models for the population. This study addresses the prevalence of physical activity and sedentary behaviour among medical students in Latin America during the year 2023. A total of 864 participants from 12 institutions across eight countries were surveyed using the Global Physical Activity Questionnaire. Significant variations in physical activity and sedentary behaviour were observed according to sex, age, body mass index, academic year, and country. Notably, Costa Rica exhibited the highest levels of moderate physical activity in leisure time (90 min/day). Strength training was more common among men (60 min/day) and in Argentina (60 min/day). Sedentary behaviour was higher in women (420 min/day) and during the first academic year (485 min/day). Uruguay stood out with high levels of sedentary behaviour (600 min/day). Correlations indicated positive moderate associations between academic year and moderate leisure-time PA (r:0,128, p:0,007). In conclusion, there are associations between the level of physical activity and sedentary behaviour with the variables studied in this research, with the main findings being that the female sex has more time spent in sedentary behaviour (minutes/day) and less time spent in strength training (minutes/day). Additionally, there are higher levels of sedentary behaviour in the early years of medical study compared to the later years of the program. © The Author(s) 2024Ítem Use of self-organizing maps for the classification of cardiometabolic risk and physical fitness in adolescents(Routledge, 2024) Yáñez-Sepúlveda, Rodrigo; Olivares, Rodrigo; Ravelo, Camilo; Cortés-Roco, Guillermo; Zavala-Crichton, Juan Pablo; Hinojosa-Torres, Claudio; de Souza-Lima, Josivaldo; Monsalves-Álvarez, Matías; Reyes-Amigo, Tomás; Hurtado-Almonacid, Juan; Páez-Herrera, Jacqueline; Mahecha-Matsudo, Sandra; Olivares-Arancibia, Jorge; Clemente-Suárez, Vicente JavierThis study aimed to automatically classify physical fitness and cardiometabolic risk in a Chilean adolescent using self-organizing maps. This cross-sectional study analysed a nationally representative database from the Physical Education Quality Measurement System (n = 7197). Physical fitness and cardiometabolic risk variables were derived from anthropometric indicators. Self-Organizing maps (SOM) were employed to identify participant profiles based on an unsupervised predictive model. After implementing and training the SOM, a detailed analysis of the generated maps was conducted to interpret the revealed relationships and clusters. The analysis resulted in three classification groups, categorizing the sample into low, moderate, and high-risk levels. Students with better physical fitness exhibited lower cardiometabolic risk levels and a lower body mass index. SOM, through an unsupervised model, is a reliable tool for classifying cardiometabolic risk and physical fitness in adolescents. © 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.