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24-h Movement Guidelines and Overweight and Obesity Indicators in Toddlers, Children and Adolescents: A Systematic Review and Meta-Analysis
(Springer, 2023-12) Marques, Adilson; Ramirez-Campillo, Rodrigo; Gouveia, Élvio R.; Ferrari, Gérson; Tesler, Riki; Marconcin, Priscila; Loureiro, Vânia; Peralta, Miguel; Sarmento, Hugo
Background: Engaging in physical activity increases energy expenditure, reducing total body fat. Time spent in sedentary behaviours is associated with overweight and obesity, and adequate sleep duration is associated with improved body composition. This systematic review aimed to analyse the relationship between compliance with the 24-h movement guidelines and obesity indicators in toddlers, children and adolescents. Methods: A systematic review and meta-analysis was conducted. PubMed, Web of Science and Scopus were searched from inception to December 2021. Cross-sectional and prospective studies that analysed the relationship between 24-h movement guidelines and overweight and obesity written in English, French, Portuguese or Spanish were included. PROSPERO registration number is CRD42022298316. Results: The associations between meeting the 24-h movement guidelines and standardised body mass index were null in the two studies for toddlers. Seven studies analysed the relationship between compliance with the 24-h movement guidelines and overweight and obesity among preschool children. Of these seven studies, six found no association between compliance with 24-h movement guidelines and body composition. Among children and adolescents, 15 articles were analysed. Of these 15 studies, in seven, it was found that children and adolescents who meet the 24-h movement guidelines were more likely to have lower risks of overweight and obesity. The meta-analysis yielded a pooled OR = 0.80 (95% CI = 0.68 to 0.95, p = 0.012, I 2 = 70.5%) in favour of compliant participants. Regarding participants’ age groups, compliance with 24-h movement guidelines seems to exert greater benefits on overweight and obesity indicators among children-adolescents (OR = 0.62, p = 0.008) compared to participants at preschool (OR = 1.00, p = 0.931) and toddlers (OR = 0.91, p = 0.853). Conclusion: Most included studies have not observed a significant relationship between compliance with the 24-h movement guidelines and overweight and obesity in toddlers, children and adolescents. © 2023, The Author(s).
A complex perspective on the etiology of diseases
(Revista Facultad de Medicina, 2019) Moreno-Leiva, Germán Mauricio; Álvarez-Zuñiga, Miguel Ángel; Arias-Poblete, Leónidas Eduardo
Although the goal of medical research is to understand better how the body and its functioning relate to dysfunctional patterns and how they generate pathologies, most current efforts focus on small questions using increasingly detailed data. However, it might be possible to successfully approach patients by taking a broader look at body mechanisms, from a global perspective, and thinking about how dysfunctions or pathologies can trigger other problems. The body can be understood as a complex system or network in which dysfunctional patterns arise from the interaction between multiple physical and functional levels. Achieving greater progress with patients will depend, fundamentally, on the properties and relationships of pathologies, dysfunctions and tools that are available or should be developed in order to study pathology-dysfunction mechanisms.
A Higher Skeletal Muscle Mass and Lower Adiposity Phenotype Is Associated with Better Cardiometabolic Control in Adults with Hip and Knee Osteoarthritis: Results from the Chilean National Health Survey 2016–2017
(MDPI, 2023-09) Guede-Rojas, Francisco; Ibacache-Saavedra, Paulina; Leal, María Inés; Tuesta, Marcelo; Durán-Marín, Cristóbal; Carrasco-Marín, Fernanda; Cigarroa, Igor; Alvarez, Cristian; Izquierdo, Mikel; Delgado-Floody, Pedro
Objective: This study aimed to (1) characterize cardiometabolic factors in self-reported hip and knee osteoarthritis (OAD) across four body composition phenotypes defined by muscle mass and adiposity, and (2) associate risk factors with diabetes and hypertension (HTN). Methods: A cross-sectional analysis of the Chilean National Health Survey 2016–17 (n = 4996) stratified participants into four groups: low skeletal muscle mass/high waist circumference (Low-SMM/High-WC), low SMM/low WC (Low-SMM/Low-WC), high SMM/high WC (High-SMM/High-WC), and high SMM/low WC (reference group). Each group was further divided into subgroups with or without diagnosed hip or knee OAD. The main outcomes were fasting plasma glucose, systolic (SBP)/diastolic (DBP) blood pressure (continuous outcomes), and other secondary factors such as cardiovascular risk (CVR). Results: In the hip OAD subgroup, the Low-SMM/High-WC groups had significantly higher SBP versus the reference value (145 vs. 127 mmHg, p < 0.0001, diff +18 mmHg). In the knee OAD subgroup, the Low-SMM/High-WC groups had significantly higher SBP versus the reference value (141 vs. 134 mmHg, p < 0.0001, diff +7 mmHg). The SBP showed a significant interaction between the group and OAD diagnosis (p = 0.007 hip OAD; p < 0.0001 knee OAD). Conclusions: Hip and knee OAD associates with elevated SBP/DBP in older adults. OAD groups showed an OR above 2 for diabetes, 2.7 for HTN, 4.5 for metabolic syndrome, and over 2 for moderate-to-high cardiovascular risk. OAD interacts substantially with cardiometabolic factors, especially in low muscle mass/high adiposity phenotypes. Lifestyle optimization of physical activity and nutrition to preserve muscle mass and mitigate adiposity is essential for cardiometabolic health promotion in OAD patients. © 2023 by the authors.
A meta-analysis of the effects of strength training on arterial stiffness
(Wroclaw University of Health and Sport Sciences, 2023) García-Mateo, Pablo; Ramirez-Campillo, Rodrigo; García-De-Alcaraz, Antonio; Rodríguez-Pérez, Manuel Antonio
Purpose. Arterial stiffness (AS) describes the mechanical properties of the arterial wall and predicts cardiovascular health. Even if it is known that AS is improved by aerobic exercise, the effects of resistance training (RT) are less clear. Therefore, this meta-analysis aimed to assess the effects of RT on AS. Methods. A systematic search for randomized controlled trials published until October 2020 was performed in the PubMed, SPORTDiscus, MEDLINE, and Web of Science databases. Overall, 19 studies were selected, with 12.58 ± 0.82 methodological quality points (from a total 15 points) and a total of 626 participants. Results. No significant long-term effect was noted for RT on AS (ES = –0.07; 95% CI: –0.59 to 0.45; p = 0.789). However, RT induced a significant acute increase in AS (ES = 1.07; 95% CI: 1.55 to 0.59; p < 0.001). No other factors (i.e., age, gender, AS measurement, upper- vs. lower-body RT, training intensity, duration, frequency) had a significant modifying effect on AS in acute or long-term interventions. Conclusions. Although RT induces an acute AS increase, this effect has no long-term impact, irrespective of the participant’s age, sex, or RT variables, such as intensity. However, the clinical implications of acute AS increase after RT are unknown. © Wroclaw University of Health and Sport Sciences.
A Systematic Review with Meta-Analysis on the Effects of Plyometric-Jump Training on the Physical Fitness of Combat Sport Athletes
(MDPI, 2023-02) Ojeda-Aravena, Alex; Herrera-Valenzuela, Tomás; Valdés-Badilla, Pablo; Báez-San Martín, Eduardo; Thapa, Rohit K.; Ramirez-Campillo, Rodrigo
We aimed to assess the athletic performance changes in combat sport athletes (CoSAs) after plyometric-jump training (PJT), compared to control conditions, through a systematic review with meta-analysis. Following PRISMA guidelines, three electronic databases were searched for includable articles, according to a PICOS approach. Using a random-effects model, Hedges’ g effects sizes (ES) were calculated. Heterogeneity was assessed using the I2 statistic, with values of <25%, 25–75%, and >75% representing low, moderate, and high levels of heterogeneity, respectively. Statistical significance was set at p ≤ 0.05. The certainty of evidence was assessed using the GRADE approach. Twelve eligible articles were identified for systematic review, seven of high quality and five of moderate quality, according to the PEDro scale. The studies recruited taekwondo, silat, wrestling, judo, fencing, and karate athletes (292 total participants), including specific–active and active controls. Most participants had a mean age of <18 years and were males (n = 225). Compared to the control, PJT programmes, involving 4–12 weeks and 2–3 sessions per week, induced small to moderate improvements (ES = 0.47 to 1.04) in athletes’ maximal strength (e.g., 1RM squat), vertical jump height, change-of-direction speed, and specific performance (e.g., fencing movement velocity), although without meaningful effects on body mass, fat mass, and muscle mass (ES = 0.02 to −0.06). Most (7 of 8) outcomes attained low heterogeneity. The outcome-level GRADE analysis indicated a certainty of evidence from low to moderate. In conclusion, PJT, when compared to control conditions, may improve CoSA athletic performance. © 2023 by the authors.
Absolute reliability and concurrent validity of hand held dynamometry and isokinetic dynamometry in the hip, knee and ankle joint: Systematic review and meta-analysis
(De Gruyter Open Ltd, 2017) Chamorro, Claudio; Armijo-Olivo, Susan; De La Fuente, Carlos d,; Fuentes, Javiera; Javier Chirosa, Luis f
The purpose of the study is to establish absolute reliability and concurrent validity between hand-held dynamometers (HHDs) and isokinetic dynamometers (IDs) in lower extremity peak torque assessment. Medline, Embase, CINAHL databases were searched for studies related to psychometric properties in muscle dynamometry. Studies considering standard error of measurement SEM (%) or limit of agreement LOA (%) expressed as percentage of the mean, were considered to establish absolute reliability while studies using intra-class correlation coefficient (ICC) were considered to establish concurrent validity between dynamometers. In total, 17 studies were included in the meta-analysis. The COSMIN checklist classified them between fair and poor. Using HHDs, knee extension LOA (%) was 33.59%, 95% confidence interval (CI) 23.91 to 43.26 and ankle plantar flexion LOA (%) was 48.87%, CI 35.19 to 62.56. Using IDs, hip adduction and extension; knee flexion and extension; and ankle dorsiflexion showed LOA (%) under 15%. Lower hip, knee, and ankle LOA (%) were obtained using an ID compared to HHD. ICC between devices ranged between 0.62, CI (0.37 to 0.87) for ankle dorsiflexion to 0.94, IC (0.91to 0.98) for hip adduction. Very high correlation were found for hip adductors and hip flexors and moderate correlations for knee flexors/extensors and ankle plantar/dorsiflexors. © 2017 Claudio Chamorro et al. 2017.
Absolute reliability and concurrent validity of hand held dynamometry and isokinetic dynamometry in the hip, knee and ankle joint: Systematic review and meta-analysis
(De Gruyter, 2017-01) Chamorro, C.; Armijo-Olivo, S.; De La Fuente, C.; Fuentes, J.; Chirosa, L.J.
The purpose of the study is to establish absolute reliability and concurrent validity between hand-held dynamometers (HHDs) and isokinetic dynamometers (IDs) in lower extremity peak torque assessment. Medline, Embase, CINAHL databases were searched for studies related to psychometric properties in muscle dynamometry. Studies considering standard error of measurement SEM (%) or limit of agreement LOA (%) expressed as percentage of the mean, were considered to establish absolute reliability while studies using intra-class correlation coefficient (ICC) were considered to establish concurrent validity between dynamometers. In total, 17 studies were included in the meta-analysis. The COSMIN checklist classified them between fair and poor. Using HHDs, knee extension LOA (%) was 33.59%, 95% confidence interval (CI) 23.91 to 43.26 and ankle plantar flexion LOA (%) was 48.87%, CI 35.19 to 62.56. Using IDs, hip adduction and extension; knee flexion and extension; and ankle dorsiflexion showed LOA (%) under 15%. Lower hip, knee, and ankle LOA (%) were obtained using an ID compared to HHD. ICC between devices ranged between 0.62, CI (0.37 to 0.87) for ankle dorsiflexion to 0.94, IC (0.91to 0.98) for hip adduction. Very high correlation were found for hip adductors and hip flexors and moderate correlations for knee flexors/extensors and ankle plantar/dorsiflexors.
Actualizaciones sobre "Irisina": la nueva mioquina
(Sociedad Chilena de Nutricion Bromatologia y Toxilogica, 2016-09) Trujillo Gittermann, Luz María; García L., Daniela; Oetinger G., Astrid Von
En la búsqueda continua de los investigadores por combatir de manera más efectiva la obesidad, se descubre una mioquina llamada Irisina. La Irisina es secretada principalmente por el músculo esquelético en respuesta al ejercicio, ya sea aeróbico, de fuerza o de alta intensidad, donde se incluyen, ejercicios de intervalo de alta intensidad (HIIT). Esta hormona polipeptídica actúa principalmente sobre células adiposas subcutáneas, transformando grasa blanca en grasa parda. La grasa parda es altamente termogénica, lo que favorece el aumento del gasto energético total y ayuda a mantener o incluso a perder peso corporal. La concentración de Irisina plasmática se relaciona positivamente con la sensibilidad a la insulina y la pérdida de peso. Además, se ha descubierto que una mayor concentración de Irisina plasmática se relaciona con el alargamiento de los telómeros, y también, con una mayor concentración de T4 libre y con un recién descubierto efecto antitumoral en algunos tipos de cáncer. Todas las funciones mediadas por la Irisina, le atribuyen una acción protectora contra distintas enfermedades, especialmente metabólicas. El objetivo de esta revisión fue actualizar el conocimiento sobre la Irisina, evidenciando los efectos que tiene la realización de ejercicio sobre los niveles plasmáticos de ésta, así como también comprender como su liberación influye en distintos sistemas corporales. El contar con mayor información dará paso a nuevas líneas de investigación y permitirá contar con estrategias terapéuticas no farmacológicas que contribuyan en el tratamiento de enfermedades crónicas no transmisibles.
Acupuncture-like transcutaneous electrical nerve stimulation as an accelerating tool for the recovery of the tissues exposed to vocal overload
(Universidad de Castilla la Mancha, 2020) Fuentes Aracena, C.; Arrau Bordali, J.; Pino Quiroz, G.; Valdivia Alarcón, N.; Aguilar Pavez, C.
Traditionally, it has been suggested that rest is the ideal tool to allow natural recovery of tissues induced by overload. However, the times necessary for this to occur are very long. It has been estimated that electrotherapy is useful when it comes to recover some overused tissues, however, these benefits in vocal function are unknown. The purpose of this study was to describe the effects of acupuncture-like transcutaneous electrical nerve stimulation on the laryngeal and cordai tissues that were previously subjected to vocal overload. In this research. 21 women without pathology or vocal training participated, whose age was 24 ± 1.28 years. The participants were subjected to vocal overload for 40 minutes and subsequently to 15 minutes of acupuncture-like transcutaneous electrical nerve stimulation. Through continuous laryngoscopy, acoustic-perceptual analysis and symptomatic study, the changes caused by electrotherapy were examined. The main results include perilaryngeal and intrinsic laryngeal muscles relaxation, and elimination of the symptoms suffered. This way it is concluded that electrostimulation is a useful tool in the acceleration of tissue recovery subjected to vocal overload.
Acute Effect of Velocity-Based Resistance Training on Subsequent Endurance Running Performance: Volume and Intensity Relevance
(Multidisciplinary Digital Publishing Institute (MDPI), 2024-04) Pérez-Castilla, Alejandro; Ruiz-Alias, Santiago A.; Ramirez-Campillo, Rodrigo; Miras-Moreno, Sergio; García-Pinillos, Felipe; Marcos-Blanco, Aitor
This study aimed to compare the acute effect of four back squat velocity-based training (VBT) protocols in terms of intensity (60% vs. 80% of the one repetition maximum [1RM]) and volume (10% vs. 30% threshold for velocity loss in the set) on the maximal aerobic speed (MAS) estimated from a running track test (RTT) in recreationally trained young adult men and women. Twenty participants (eleven men and nine women) undertook five randomized protocols in separate occasions: (i) RTT alone (control condition); (ii) VBT with 60% 1RM and a 10% velocity loss followed by RTT (VBT60–10 + RTT); (iii) VBT with 60% 1RM and a 30% velocity loss followed by RTT (VBT60–30 + RTT); (iv) VBT with 80% 1RM and 10% velocity loss followed by RTT (VBT80–10 + RTT); (v) VBT with 80% 1RM and 30% velocity loss followed by RTT (VBT80–30 + RTT). All VBT protocols involved three sets with three minutes of rest. The MAS was higher for RTT (control) than VBT60–30 + RTT (p < 0.001; Δ = 3.8%), VBT60–10 + RTT (p = 0.006; Δ = 2.8%), VBT80–10 + RTT (p = 0.008; Δ = 2.7%), and VBT80–30 + RTT (p = 0.019; Δ = 1.9%). No protocol × sex interaction was noted (p = 0.422). Therefore, regardless of sex, MAS is acutely impaired after VBT, especially if the training sets are performed with a low relative load and a high velocity loss threshold.
Acute Effect of Velocity-Based Resistance Training on Subsequent Endurance Running Performance: Volume and Intensity Relevance
(Multidisciplinary Digital Publishing Institute (MDPI), 2024-04-14) Pérez-Castilla, Alejandro; Ruiz-Alias, Santiago A.; Ramirez-Campillo, Rodrigo; Miras-Moreno, Sergio; García-Pinillos, Felipe; Marcos-Blanco, Aitor
This study aimed to compare the acute effect of four back squat velocity-based training (VBT) protocols in terms of intensity (60% vs. 80% of the one repetition maximum [1RM]) and volume (10% vs. 30% threshold for velocity loss in the set) on the maximal aerobic speed (MAS) estimated from a running track test (RTT) in recreationally trained young adult men and women. Twenty participants (eleven men and nine women) undertook five randomized protocols in separate occasions: (i) RTT alone (control condition); (ii) VBT with 60% 1RM and a 10% velocity loss followed by RTT (VBT60–10 + RTT); (iii) VBT with 60% 1RM and a 30% velocity loss followed by RTT (VBT60–30 + RTT); (iv) VBT with 80% 1RM and 10% velocity loss followed by RTT (VBT80–10 + RTT); (v) VBT with 80% 1RM and 30% velocity loss followed by RTT (VBT80–30 + RTT). All VBT protocols involved three sets with three minutes of rest. The MAS was higher for RTT (control) than VBT60–30 + RTT (p < 0.001; Δ = 3.8%), VBT60–10 + RTT (p = 0.006; Δ = 2.8%), VBT80–10 + RTT (p = 0.008; Δ = 2.7%), and VBT80–30 + RTT (p = 0.019; Δ = 1.9%). No protocol × sex interaction was noted (p = 0.422). Therefore, regardless of sex, MAS is acutely impaired after VBT, especially if the training sets are performed with a low relative load and a high velocity loss threshold.
Acute effects of fasting aerobic exercise on carbohydrate and fat metabolism and utilization in sedentary overweight and obese adults: A pilot study
(Sociedad Chilena de Nutricion Bromatologia y Toxilogica, 2022-06) Morán, Matías; Peñailillo, Luis
Purpose: To compare the acute effects of fasting and postprandial aerobic exercise on carbohydrate and fat utilization in sedentary overweight and obese men. Methods: Quantitative, experimental, randomized, crossover design. Seven seden-tary, overweight or obese (body mass index [BMI]= 29.3 ± 1.9 kg/m2) adult men (37.9 ± 2.4 years) performed 60 min of aerobic exercise at 50% of maximal aerobic power both fasting (FASTED) and postprandial (FED). The first exercise type was randomly assigned. We measured the respiratory exchange ratio (RER) by basal indirect calorimetry during and after exercise; glycemia, ketone bodies and capillary lactate at baseline, pre-start, immediately and 40 minutes post exercise were measured in each exercise protocol. Oxidation of carbohydrates and fats was estimated from the RER according to stoichiometric equations. Results: During exercise there were no significant differences in the use of substrates between FASTED and FED. After exercise, only FASTED had an increase (p<0.05) in fat oxidation relative to body (Pre 0.010 ± 0.006 kJ/min/kg vs Post 0.020 ± 0.014 kJ/min/kg), carbohydrate oxidation (Pre 0.060 ± 0.010 kJ/min/kg vs Post 0.070 ± 0.012 kJ/min/kg), and total energy expenditure (Pre 0.070 ± 0.017 kJ/min/kg vs Post 0.090 ± 0.028 kJ/min/kg). There were no differences in FED, nor significant differences between FASTED and FED. Conclusion: Moderate aerobic fasting exercise increases post-session fat and carbohydrate oxidation in overweight and obese men. This could be useful for application in sedentary patients with excess weight. © 2022, Sociedad Chilena de Nutricion Bromatologia y Toxilogica. All rights reserved.
Acute Fatigue Impairs Heart Rate Variability and Resting Muscle Oxygen Consumption Kinetics
(Multidisciplinary Digital Publishing Institute (MDPI), 2024-10) Vasquez-Bonilla, Aldo A.; Yáñez-Sepúlveda, Rodrigo; Tuesta, Marcelo; Martin, Eduardo Báez-San; Monsalves-Álvarez, Matías; Olivares-Arancibia, Jorge; Duclos-Bastías, Daniel; Recabarren-Dueñas, Catalina; Alacid, Fernando
Featured Application: Importantly, measurements obtained through VOT-NIRS can vary significantly post-exercise, which should be considered by researchers before application. This study evaluated the influence of acute fatigue on heart rate variability (HRV) and muscle oxygen saturation (SmO2) at rest, as well as the reliability of SmO2 data measured using near-infrared spectroscopy (NIRS) during a vascular occlusion test (VOT). Twelve physically active subjects participated. Measurements included perceived muscle soreness using the visual analog scale (VAS pain), HRV parameters, variables of resting SmO2 (desaturation and resaturation), and reoxygenation kinetics (mean response time, MRT) through a VOT-NIRS located in the vastus lateralis (VL). Measurements were taken at three points: 24 h before, before exhaustive exercise, and 30 min after exhaustive exercise. The results indicated that acute fatigue increased resting muscle oxygen consumption in desaturation (+22 SmO2) and resaturation (+18 SmO2), improved MRT (−15 s), and elevated sympathetic nervous system (SNS) activity, as observed in the R-R interval (−262 ms) and SNS index (+0.5). HRV significantly influenced desaturation (r2 = 0.69), resaturation (r2 = 0.60), and MRT (r2 = 0.54). Reliability was established with an ICC of 0.49 and 0.63 for desaturation and resaturation, respectively. Real changes in desaturation and resaturation should be considered ≥ 7% SmO2 at rest and ≥ 11% SmO2 to avoid daily fatigue interference. In conclusion, acute fatigue increases resting SmO2 consumption and is associated with higher SNS activity and increased VAS pain.
Age-dependent Knee Joint Isokinetic Profile in Professional Male Soccer Players
(Australian International Academic Centre PTY LTD, 2022) Torres-Banduc, Maximiliano A.; Jerez-Mayorga, Daniel; Ojeda, Álvaro Huerta; Bishop, Chris; Ramirez-Campillo, Rodrigo
Background: The knee-joint isokinetic profile (KJIP) injury risk factor may be modulated by chronological age, however, comparative data for elite male soccer players aged 25 years and older is lacking. Objective: To describe and compare the knee-joint isokinetic profile (KJIP) according to the chronological age of professional male soccer players. Method: In a cross-sectional study design, sixty-three soccer athletes from the first Chilean soccer division (A-series) were divided into younger and older groups (age ≤ 25 years; n = 35 and age > 25 years; n = 28, respectively). In both groups the IPKJ was assessed at 60°.s-1 in concentric mode. Results: The older group had lower extensor peak torque (p < .05). The younger group showed correlations between flexors peak torque and extensors mean power (p < .001). In the older group, flexors peak torque and flexors mean power were correlated. The flexors peak torque, total work, and mean power symmetric index (SI) exhibited values > 10 % for both groups. The extensors SI showed values > 10 % for mean power, although only in the older group. Conclusion: Several differences in the KJIP were noted between professional male soccer players aged ≤ 25 years and > 25 years. Current results offer injury prevention insights, discussed in the current manuscript. © 2022 The authors.
Alarming low physical activity levels in Chilean adults with disabilities during COVID-19 pandemic: a representative national survey analysis
(Frontiers Media S.A., 2023-06) Henríquez, Matías; Ramirez-Campillo, Rodrigo; Cristi-Montero, Carlos; Reina, Raul; Alvarez, Cristián; Ferrari, Gerson; Aguilar-Farias, Nicolas; Sadarangani, Kabir P.
Background: People with disabilities usually face barriers to regularly engaging in physical activities. Estimating physical activity patterns are necessary to elaborate policies and strategies to facilitate active lifestyles, considering the particular access difficulties experienced by this population. Purpose: This study aimed (i) to describe the prevalence of physical activity levels and (ii) to examine the associations of physical activity levels with socio-demographic variables and type of disability in the 2020 Chilean National Physical Activity and Sports Habits in Populations with Disabilities (CNPASHPwD) survey during the coronavirus disease 19 (COVID-19) pandemic. Methods: Cross-sectional data from 3,150 adults (18–99 years old), 59.8% female, were analyzed from November to December 2020. Self-reported age, gender, type of disability (i.e., physical, visual, hearing, intellectual, or mixed), socio-economic status, area and zone of residence, and physical activity levels (0 min/week, < 150 min/week, ≥ 150 min/week) were obtained. Results: 11.9% of the participants were classified as active (≥ 150 min/week), and 62.6% declared no involvement in physical activity. A larger proportion of females (61.7%) did not meet the current guidelines (≥ 150 min/week of physical activity) in comparison with males (p < 0.001). Participants with visual and hearing disabilities were more likely to be active than those with other types of disabilities. Those living in the central and southern regions of Chile were more likely to be physically active than those from the northern region. Also, older participants, women, and those from lower socio-economic statuses were less likely to meet the physical activity guidelines. Conclusion: Alarmingly, nine out of ten participants were categorized as physically inactive, particularly women, older adults, and those with a low socioeconomic status. If the pandemic context moderated, the considerable prevalence of reduced physical activity levels deserves future exploration. Health promotion initiatives should consider these aspects, emphasizing inclusive environments and increasing opportunities to favor healthy behaviors, countering the COVID-19 effects. Copyright © 2023 Henríquez, Ramirez-Campillo, Cristi-Montero, Reina, Alvarez, Ferrari, Aguilar-Farias and Sadarangani.
An after-school, high-intensity, interval physical activity programme improves health-related fitness in children
(Universidade Estadual Paulista - UNESP, 2016-10) Reloba Martínez, Sergio; Chirosa Ríos, Luis Javier; Tamayo, Ignacio Martín; Guerrero Almeida, Laura; López-Gomez, Miguel Angel; Campos Jara, Christian
Health problems related to a low level of physical activity (PA) in children and adolescents have prompted research into extracurricular PA programs. This study was designed to determine the effects of two different levels of PA on the health-related fitness of school children. Ninety-four girls and boys (7-9 years) were randomly assigned to a control group (CG) or intervention group (IG). Over a 12 week study period, children in the CG participated in a similar PA program to that of a standard school physical education program while those in the IG completed a high intensity interval training (HIIT) program. Both programs involved two 40 minute extracurricular sessions per week. Our findings indicate that the HIIT intervention improved motor capacity (speed/agility), Vpeak, VO2 max and excess post-exercise oxygen consumption (EPOC) (p < 0.05) along with the musculoskeletal capacity of the lower trunk (mean propulsive velocity and standing long jump, p < 0.05). The PA program had no effect on anthropometric variables or hand-grip strength. The data indicate that a 12 week strength training program using workloads adapted to children may significantly improve several markers of health and physical fitness compared to a standard school PA program.
Analysis of Magnitude and Direction of Body Composition Asymmetries in Male Brazilian Jiu-Jitsu Athletes: Pilot Study
(Multidisciplinary Digital Publishing Institute (MDPI), 0025-02) Ojeda-Aravena, Alex; Kons, Rafael L; Azócar-Gallardo, Jairo; Dopico-Calvo, Xurxo; Fernández, Aida; Tuesta-Roa, Marcelo; Cresp-Barria, Mauricio; Olivares-Arancibia, Jorge; Báez-San Martín, Eduardo
In order to optimize body composition and its components, it is of interest to analyze inter-limb asymmetries in athletes of popular combat sports such as Brazilian Jiu-Jitsu (BJJ). This study aimed to assess the magnitude and direction of body composition asymmetry in competitive male BJJ athletes. Seventeen experienced and competitive male BJJ athletes (age 34.59 ± 8.00 years, 172.94 ± 5.46 cm, BJJ experience 7.88 ± 5.57 years, and 3.71 ± 1.05 days of weekly volume training), including Guard Fighters (n = 7) and Pass Fighters (n = 10), participated in this study. In a single session, whole-body and segmental upper limb and lower limb body composition (BC) was assessed utilizing dual-energy X-ray absorptiometry (DXA). The assessment included total mass (TM), fat mass (FM), fat mass percentage (%FM), fat-free mass (FFM), and bone mineral content (BMC). Absolute differences between limbs were analyzed using a paired t-test. A comparison of BC asymmetries according to combat styles was conducted using an independent t-test. The effect size (ES) was interpreted as Cohen’s d. The main results revealed significant asymmetries in the upper limbs (ULs) of the total group; greater values were found on the left side for TM (p = 0.009, ES = 0.725), FM (p = 0.016, ES = 0.650), FFM (p = 0.026, ES = 0.594), and BMC (p < 0.001, ES = 0.993). In Pass Fighters, differences favored the right side in TM (p = 0.003, ES = 1.277), FM (p = 0.009, ES = 1.039), FFM (p = 0.011, ES = 1.000), and BMC (p < 0.001, ES = 1.916). In contrast, Guard Fighters showed no discrepancies in these parameters. No notable disparities were observed in the lower limbs. This pilot study reveals that BJJ athletes present significant asymmetries in BC, particularly in the ULs, with a marked predominance on the right side, especially in Pass Fighters. © 2025 by the authors.
Anatomical Repair With Achilles Tendon Allograft Augmentation for Distal Medial Collateral Ligament Ruptures
(Elsevier B.V., 2024-07) Yáñez, Roberto; Saravia, Anthony; Zamorano, Hector; Caracciolo, Gaston; Neira, Alejandro; De la Fuente, Carlos
Several conditions may require medial collateral ligament (MCL) surgery, especially when high physical demands are required. Thus, we described a technique for anatomical repair of distal MCL rupture using a distal anchor and MCL augmentation through Achilles tendon allograft with proximal bone block and interference screw. This procedure fixes an anchor distally at the tibia. Then, the ligament endings are sutured using a continuous simple-type technique. Subsequently, a low-radiated Achilles tendon allograft is attached proximally and fixed through an interference screw. Finally, the allograft is sutured using a continuous simple-type technique. Our anatomical MCL repair and augmentation allows a reinforced anatomical technique to control the valgus instability caused by MCL distal ruptures, considering the MCL axial traction and posterior oblique ligament fiber orientations.
Anogenital lesions produced by Human Papillomavirus. Prevalence study in children and adolescent not vaccinated
(Andes PediatricaOpen AccessVolume 94, Issue 1, Pages 29 - 36January-February 2023, 2023) Patricia Romero, Fuentes; Eugenio Ramírez V.; Mónica Muñoz O.; Paula Muñoz M.; Carolina González L.; Carolina Orellana C.; Carolina Pastene S.; Montserrat Balanda A.; Nicolásvergara V.; Alvaro Reyes P.
In Chilean children and adolescents, human papillomavirus (HPV) infection prevalence is unknown. In 2014, the HPV vaccine was incorporated into the National Immunization Program for girls, and since 2019 for boys. Objective: To determine the prevalence, genotypes, and characteristics of HPV infection in children and adolescents with anogenital lesions not vaccinated against HPV. Patients and Method: Children and adolescents with anogenital lesions who consulted at the Luis Calvo Mac-kenna Children’s Hospital between 2013 and 2017 were studied. The reason for consultation, age, sex, family history of HPV lesions, history of sexual abuse, and consensual sexual activity were recorded. HPV was detected by PCR and typification by reverse hybridization of the L1 gene. The samples were analyzed in the Oncogenic Virus Section of the Institute of Public Health. Results: 110 patients were studied; 44.5% were children. HPV was detected in 34 cases (30.9% [CI95% 22.4-40.4]), 22 (44.9%) were children and 12 (19.7%) adolescents. Eleven (91.7%) adolescents had a history of sexual contact (p < 0.005); 4 (18.2%) children disclosed sexual abuse. HPV was found in 25% of patients with genital lesions and 50% with perianal lesions (p < 0.015). The most frequent genotypes were 59, 58, 16, 18, 6, and 11. Only low-risk genotypes were detected in children and high-risk genotypes were detected in 11/12 (91.7%) of HPV (+) adolescents. Conclusion: The prevalence of HPV infection was 30%. In adolescents, the infection was related to sexual contact and high-risk HPV. In children, it was associated with low-risk genotypes. Perianal lesions are more frequently associated with HPV infection than genital lesions in children and adolescents. The visual inspection does not allow to specify the etiology of the genital lesions, so it is necessary to perform a PCR test for HPV. © 2023, Sociedad Chilena de Pediatria. All rights reserved
Anthropometric Indicators of the Cardiometabolic Risk, Muscle Strength, and Functional Capacity of Schoolchildren with Intellectual Disabilities during Lockdown in Chile
(MDPI, 2022-09) Farías Valenzuela, Claudio; Ferrari, Gerson; Espoz Lazo, Sebastián; Ferrero Hernández, Paloma; Jofré Saldia, Emilio; Álvarez Arangua, Sebastián; Poblete Aro, Carlos; Godoy Cumillaf, Andrés; Cofre Bolados, Cristian; Valdivia Moral, Pedro
Lockdown due to the COVID-19 pandemic has negatively impacted the social, psychological, and physical well-being of the world population. In the case of people with intellectual disabilities, the impact of lockdown on their physical condition and functionality is not completely clear. This study aimed to determine the effects of COVID-19 lockdown on the anthropometric indicators of cardiometabolic risk, muscle strength, and functionality on schoolchildren with intellectual disabilities. The sample was composed of 132 students of both sexes (n = 74 pre-lockdown; n = 58 lockdown) belonging to two special education centers from the Metropolitan Region of Santiago, Chile. Our results showed significant reductions (p ≤ 0.05) in absolute and relative handgrip strength, as well as in functionality, when comparing pre-lockdown and lockdown measurements, with a greater loss in girls than boys. The design and implementation of physical exercise programs centered on strength training are necessary for the physical and functional reconditioning of this population. These programs need to be implemented in special education centers considering the general well-being, quality of life and work needs of people with intellectual disabilities. © 2022 by the authors.

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