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This study evaluated the role of the mesenchymal stem cells derived from adipose tissue (MSCs) in provoked ventricular arrhythmias (VAs) in animals with myocardial infarction (MI). The experimental groups were: sham, subjected to sham surgery and intramyocardial saline injection; MIV, infarcted rats subjected to intramyocardial saline injection; MI + MSCs, infarcted rats subjected to intramyocardial MSCs injection. Injections were performed two days after infarction and the arrhythmogenic inducibility experiment was performed the next day. Only 35% of the MI + MSCs group developed VAs, while the one in the MIV group was 65%. The proportion of nonsustained ventricular tachycardia, sustained tachycardia, and ventricular fibrillation was similar between the infarcted groups, but MSCs animals had shorter duration of nonsustained ventricular tachycardia. However, MSCs increased connexin 43 content in the remote area, even above the levels found in the sham group. MSCs prevented the increase of IL-1ß in the different areas of the myocardium. There was higher carbonylation and content of 4-hydroxynonenal (4-HNE, a marker of lipoperoxidation) in the myocardium of infarcted rats, but MSCs attenuated the increase of 4-HNE in the infarcted area. In conclusion, MSCs have a protective effect against the development of arrhythmias, but do not imply a significant benefit for animals that have developed VAs. It is possible to think that the cardioprotection of MSCs involves anti-inflammatory/oxidative actions and improvement in the formation of communicating junctions.Graphical abstract.
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This study investigated the seasonal variations in mRNA expression of FSH (Fshr), LH (Lhr) receptors, melatonin (Mt1 and Mt2) receptors, melatonin-synthetizing enzymes (Asmt and Aanat) and melatonin concentration in developing follicles from mares raised in natural photoperiods. For one year, ultrasonographic follicular aspiration procedures were performed monthly, and small (<20 mm), medium (20 to 35 mm) and large (>35 mm) follicles were recovered from five mares. One day before monthly sample collections, an exploratory ultrasonography conducted to record the number and the size of all follicles larger than 15 mm. The total number of large follicles were higher during the spring/summer (8.2 ± 1.9) than during autumn/winter (3.0 ± 0.5). Compared to autumn/winter seasons, there was an increase of Fshr and Aanat mRNA expressions in small, medium and large follicles, an increase of Lhr and Asmt mRNA expressions in medium and large follicles and an increase of Mt1 and Mt2 mRNA expressions in small and large follicles during spring/summer. The melatonin levels in follicular fluid were also higher during the spring/summer seasons. The present data show that melatonin locally upregulates the mRNA expression of Mt1 and Mt2 receptors and melatonin-forming enzymes in mare developing follicles during reproductive seasons.
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Background: A large research portfolio indicates that an activated renal renin-angiotensin system or a deficit on melatonin is associated with several cardiovascular pathologies. In this observational clinical study, we hypothesized that alterations in urinary melatonin or angiotensinogen levels may be altered in two common conditions, preeclampsia and gestational diabetes. Our study's primary objective was to assess melatonin and angiotensinogen as novel disease biomarkers detectable and quantifiable in the urine of pregnant women with or without pregnancy complications. Methods: This was a concurrent cohort study of pregnant women with selected obstetric pathologies (gestational diabetes, preeclampsia, hypertension and obesity with hypertension). A group of healthy controls was also included. Urinary 6-sulfatoxymelatonin and angiotensinogen were measured by sensitive and specific ELISAs in first morning void urine samples. The patients were included in the cohort consecutively, and the diagnosis was blinded at the level of urine collection. Urinary 6-sulfatoxymelatonin and angiotensinogen levels were investigated in the patients included in the cohort. Results: Urinary levels of angiotensinogen were significantly higher in the gestational diabetes [angiotensinogen/creatinine ratio median (25th, 75th): 0.11 (0.07, 0.18)] and preeclampsia [0.08 (0.06, 0.18)] groups than in those with healthy pregnancy [0.05(0.04, 0.06]; 6-sulfatoxymelatonin levels were significantly lower in the gestational diabetes [ug/h: median (25th, 75th): 0.12(0.08, 0.17)] and preeclampsia [0.12 (0.09, 0.15)] groups than in those with healthy pregnancy [0.20 (0.15, 0.27]. Neither morning void protein/creatinine ratio nor 24-h urine protein estimate were significantly different between the study groups. Conclusion: These results suggest that urinary angiotensinogen levels may indicate an intrarenal RAS activation while melatonin production appears to be defective in gestational diabetes or hypertension. An angiotensinogen/melatonin ratio is suggested as an early biomarker for identification of gestational diabetes or hypertension. This report provides a basis for the potential use of melatonin for the treatment of preeclampsia. A prospective study in a larger number of patients to determine the operative characteristics of these markers as potential diagnostic tests is justified.
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Despite the growing evidence for the beneficial effects of high-intensity interval exercise (HIIE) on vascular health of overweight and obese individuals, it is not clear whether the autonomic stress promoted by HIIE during the ambulatory period is higher than that by moderate-intensity continuous exercise (MICE). Therefore, this study compares the 24 hour (h) ambulatory heart rate variability (HRV) following HIIE and MICE in young overweight and obese men. Eleven untrained men aged 23.2 ± 1.9 years, with average body mass index (BMI) of 31.6 ± 3.9â kg/m² (three overweight and eight obese), underwent three exercise sessions: HIIE, MICE and Control (CT). HRV was recorded in the laboratory and for the next 24â h following laboratory recovery. There were no differences in HRV indices in the rest period between the sessions (p > .05). During the ambulatory period, the area under the curve (AUC) of the low-frequency band transformed into natural logarithm (Ln-LF) during sleep was higher after HIIE than after CT (43.31 ± 8.59 vs. 41.11 ± 7.28â ms²*h, p = .034). The HRV followed by MICE did not differ from other sessions (p > .05). In conclusion, the 24â h ambulatory HRV did not differ after HIIE and MICE. However, despite the small effect, HIIE increased the cardiac autonomic modulation during the sleep period, as a protector of cardiovascular system. Highlights24 h ambulatory HRV could add important information about the cardiovascular safety of the exercise protocols in overweight and obese individuals.There was no disturbances in the cardiac autonomic modulation during the awake period, regardless of the exercise protocol.LnLF index was higher in HIIE compared to CT in the sleep period.24 h ambulatory HRV did not differ between the HIIE and MICE sessions.
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Entrenamiento de Intervalos de Alta Intensidad , Sobrepeso , Índice de Masa Corporal , Ejercicio Físico/fisiología , Frecuencia Cardíaca , Entrenamiento de Intervalos de Alta Intensidad/métodos , Humanos , Obesidad/terapia , Sobrepeso/terapiaRESUMEN
The endocrine pancreas of pregnant rats shows evident plasticity, which allows the morphological structures to return to the nonpregnant state right after delivery. Furthermore, it is well-known the role of melatonin in the maintenance of the endocrine pancreas and its tropism. Studies indicate increasing nocturnal serum concentrations of maternal melatonin during pregnancy in both humans and rodents. The present study investigated the role of melatonin on energy metabolism and in pancreatic function and remodeling during pregnancy and early lactation in rats. The results confirm that the absence of melatonin during pregnancy impairs glucose metabolism. In addition, there is a dysregulation in insulin secretion at various stages of the development of pregnancy and an apparent failure in the glucose-stimulated insulin secretion during the lactation period, evidencing the role of melatonin on the regulation of insulin secretion. This mechanism seems not to be dependent on the antioxidant effect of melatonin and probably dependent on MT2 receptors. We also observed changes in the mechanisms of death and cell proliferation at the end of pregnancy and beginning of lactation, crucial periods for pancreatic remodeling. The present observations strongly suggest that both functionality and remodeling of the endocrine pancreas are impaired in the absence of melatonin and its adequate replacement, mimicking the physiological increase seen during pregnancy, is able to reverse some of the damage observed. Thus, we conclude that pineal melatonin is important to metabolic adaptation to pregnancy and both the functionality of the beta cells and the remodeling of the pancreas during pregnancy and early lactation, ensuring the return to nonpregnancy conditions.
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Células Secretoras de Insulina/metabolismo , Lactancia/metabolismo , Melatonina/metabolismo , Animales , Femenino , Glucosa/metabolismo , Secreción de Insulina/fisiología , Islotes Pancreáticos/metabolismo , Embarazo , Ratas , Ratas WistarRESUMEN
Pregnancy and lactation are reproductive processes that rely on physiological adaptations that should be timely and adequately triggered to guarantee both maternal and fetal health. Pineal melatonin is a hormone that presents daily and seasonal variations that synchronizes the organism's physiology to the different demands across time through its specific mechanisms and ways of action. The reproductive system is a notable target for melatonin as it actively participates on reproductive physiology and regulates the hypothalamus-pituitary-gonads axis, influencing gonadotropins and sexual hormones synthesis and release. For its antioxidant properties, melatonin is also vital for the oocytes and spermatozoa quality and viability, and for blastocyst development. Maternal pineal melatonin blood levels increase during pregnancy and triggers the maternal physiological alterations in energy metabolism both during pregnancy and lactation to cope with the energy demands of both periods and to promote adequate mammary gland development. Moreover, maternal melatonin freely crosses the placenta and is the only source of this hormone to the fetus. It importantly times the conceptus physiology and influences its development and programing of several functions that depend on neural and brain development, ultimately priming adult behavior and energy and glucose metabolism. The present review aims to explain the above listed melatonin functions, including the potential alterations observed in the progeny gestated under maternal chronodisruption and/or hypomelatoninemia.
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Desarrollo Fetal/fisiología , Lactancia/fisiología , Melatonina/metabolismo , Glándula Pineal/metabolismo , Animales , Femenino , Humanos , Glándulas Mamarias Humanas/embriología , Sistema Nervioso/embriología , EmbarazoRESUMEN
Resumo O objetivo do presente estudo foi apresentar e analisar o perfil educacional e esportivo dos atletas de saltos ornamentais que participaram do Troféu Brasil de 2018, mediante utilizaão de um questionário estruturado com base na perspectiva de formação holística para a dupla carreira. Com amostra definida em 15 participantes, a análise exploratória foi conduzida por meio de estatística descritiva no SPSS mediante frequência geral e específica. Os resultados sugerem a compatibilidade entre as formações esportiva e educacional em uma perspectiva denominada trajetórias de transição fluidas, observando-se casos de descontinuação na formação superior. Ressalta-se a carência de uma legislação nacional sobre dupla carreira e de políticas institucionais que promovam o acesso, a permanência e a finalização da formação acadêmica dos atletas de alto rendimento, bem como aponta-se a necessidade de novos estudos com diferentes modalidades a fim de que se aprofunde o debate sobre a dupla carreira esportiva.
Abstract This study aims to present and analyze the sporting and educational profile of fancy diving athletes who participated in the 2018 Brazil Tournament (Troféu Brasil). It uses a questionnaire based on the holistic training model for a dual career. Exploratory analysis was conducted with a sample of 15 individuals, using descriptive statistics on the Statistical Package for the Social Sciences (SPSS) software according to general and specific frequency. The results suggest that sporting and educational training are compatible under a perspective called fluid transition pathways, with cases of higher education discontinuation. The study underscores the lack of legislation on dual careers in Brazil as well as institutional policies that promote access, continuation and completion of academic education for high-performance athletes. Moreover, it points out the need for new studies to expand the debate on dual careers in sports.
Resumen El objetivo de este estudio fue presentar y analizar el perfil, educacional y deportivo, de los atletas de saltos ornamentales que participaron en el Trofeo Brasil de 2018, utilizando un cuestionario estructurado basado en la perspectiva de la formación holística para el doble grado universitario. Con una muestra definida en 15 participantes, el análisis exploratorio fue conducido a través de estadística descriptiva en el software Statistical Package for the Social Sciences (SPSS) mediante frecuencia general y específica. Los resultados sugieren la compatibilidad entre las formaciones deportiva y educativa en una perspectiva denominada trayectorias de transición fluidas y se observaron casos de discontinuidad en la educación superior. Se destaca la falta de una legislación nacional sobre el doble grado y de políticas institucionales que promuevan el acceso, permanencia y finalización de la formación académica de los atletas de alto rendimiento, así como la necesidad de que se realicen nuevos estudios con diferentes modalidades para que se profundice el debate sobre el doble grado deportivo.
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Humanos , Masculino , Femenino , Deportes , Atletas , Movilidad Laboral , EducaciónRESUMEN
The aim of this study was to prevent female osteoporosis using strength training (ST), raloxifene (Ral) or a combination of ST plus Ral during the natural female aging process, specifically in the periestropause period. For a total of 120 days, aging female Wistar rats at 18-21 months of age performed ST on a ladder three times per week, and Ral was administered daily by gavage (1 mg/kg/day). Bone microarchitecture, areal bone mineral density, bone strength of the femoral neck, immunohistochemistry, osteoclast and osteoblast surface were assessed. We found that the treatments modulate the bone remodeling cycle in different ways. Both ST and Ral treatment resulted in improved bone microarchitecture in the femoral neck of rats in late periestropause. However, only ST improved cortical microarchitecture and bone strength in the femoral neck. Thus, we suggest that performing ST during the late period of periestropause is a valid intervention to prevent age-associated osteoporosis in females.
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Conservadores de la Densidad Ósea/farmacología , Cuello Femoral/efectos de los fármacos , Cuello Femoral/fisiopatología , Osteoporosis/prevención & control , Entrenamiento de Fuerza , Envejecimiento/efectos de los fármacos , Envejecimiento/metabolismo , Envejecimiento/patología , Animales , Densidad Ósea/efectos de los fármacos , Densidad Ósea/fisiología , Terapia Combinada , Femenino , Cuello Femoral/diagnóstico por imagen , Cuello Femoral/patología , Osteoblastos/efectos de los fármacos , Osteoblastos/patología , Osteoblastos/fisiología , Osteoclastos/efectos de los fármacos , Osteoclastos/patología , Osteoclastos/fisiología , Osteoporosis/diagnóstico por imagen , Osteoporosis/patología , Osteoporosis/fisiopatología , Fosfatos/sangre , Clorhidrato de Raloxifeno/farmacología , Distribución Aleatoria , Ratas Wistar , Fosfatasa Ácida Tartratorresistente/sangreRESUMEN
The effects of strength training (ST) on the mechanical bone strength and osteogenic differentiation of bone marrow mesenchymal stromal cells (BMSCs) from adult, aged and exercised aged rats were determined. The exercised aged animals displayed higher values of areal bone mineral density, compression test, alkaline phosphatase activity (ALP) and biological mineralization, while oil red O staining for adipocytes was lower. ST increased gene expression of runt-related transcription factor 2 (Runx2), osterix (Osx) as well as bone matrix protein expression, and reduced expression of peroxisome proliferator-activated receptor gamma (Pparγ). The production of pro-inflammatory cytokine tumor necrosis factor alpha (TNF-α) was lower in BMSCs of the aged exercised group. The ST practice was able to improve the bone mechanical properties in aged female rats, increasing the potential for osteogenic differentiation of BMSCs, reducing the adipogenic differentiation and pro-inflammatory cytokine level. In summary, the data achieved in this study showed that strength training triggers physiological responses that result in changes in the bone microenvironment and bring benefits to biomechanical parameters of bone tissue, which could reduce the risk of fractures during senescent.
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Envejecimiento/fisiología , Huesos/fisiología , Osteogénesis , Entrenamiento de Fuerza/métodos , Envejecimiento/metabolismo , Animales , Biomarcadores/metabolismo , Fenómenos Biomecánicos , Peso Corporal , Densidad Ósea , Células de la Médula Ósea/citología , Diferenciación Celular , Células Cultivadas , Femenino , Ratas , Ratas WistarRESUMEN
We evaluated whether strength training (ST) performed prior to skeletal muscle cryolesion would act as a preconditioning, improving skeletal muscle regeneration and responsiveness to low-level laser therapy (LLLT). Wistar rats were randomly assigned into non-exercised (NE), NE plus muscle lesion (NE + LE), NE + LE plus LLLT (NE + LE + LLLT), strength training (ST), ST + LE, and ST + LE + LLLT. The animals performed 10 weeks of ST (climbing ladder; 3× week; 80% overload). Forty-eight hours after the last ST session, tibialis anterior (TA) cryolesion was induced and LLLT (InGaAlP, 660 nm, 0.035 W, 4.9 J/cm2/point, 3 points, spot light 0.028 cm2, 14 J/cm2) initiated and conducted daily for 14 consecutive days. The difference between intergroups was assessed using Student's t test and intragroups by two-way analysis of variance. Cryolesion induced massive muscle degeneration associated with inflammatory infiltrate. Prior ST improved skeletal regeneration 14-days after cryolesion and potentiated the regenerative response to LLLT. Cryolesion induced increased TNF-α levels in both NE + LE and ST + LE groups. Both isolated ST and LLLT reduced TNF-α to control group levels; however, prior ST potentiated LLLT response. Both isolated ST and LLLT increased IL-10 levels with no additional effect. In contrast, increased TA IL-6 levels were restricted to ST and ST + LE + LLLT groups. TA myogenin mRNA levels were not changed by neither prior ST or ST + LLLT. Both prior ST and LLLT therapies increased MyoD mRNA levels and, interestingly, combined therapies potentiated this response. Myf5 mRNA levels were increased only in ST groups. Taken together, our data provides evidences for prior ST potentiating LLLT efficacy in promoting skeletal muscle regeneration.
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Terapia por Luz de Baja Intensidad , Músculo Esquelético/lesiones , Músculo Esquelético/efectos de la radiación , Condicionamiento Físico Animal , Regeneración/efectos de la radiación , Animales , Citocinas/genética , Citocinas/metabolismo , Masculino , Modelos Biológicos , Proteínas Musculares/genética , Proteínas Musculares/metabolismo , Músculo Esquelético/patología , Músculo Esquelético/fisiopatología , ARN Mensajero/genética , ARN Mensajero/metabolismo , Ratas Wistar , Cicatrización de Heridas/efectos de la radiaciónRESUMEN
This study aimed to assess the blood pressure (BP), cardiac autonomic modulation at rest, in physical exercise and in the recovery in untrained eutrophic (E) and overweight (O) youth. The body mass index (BMI), waist circumference (WC), systolic BP-SBP (E: 109.80 ± 10.05; O: 121.85 ± 6.98 mmHg) and diastolic BP - DBP (E: 65.90 ± 7.28; O: 73.14 ± 12.22 mmHg) were higher in overweight and the heart rate recovery (%HRR) was lower as compared with E volunteers. The BMI was associated with SBP (r= 0.54), DBP (r= 0.65), load on the heart rate variability threshold - HRVT (r= -0.46), %HRR 2' (r= -0.48) and %HRR 5' (r= -0.48), and WC was associated with SBP (r= 0.54), DBP (r= 0.64) and HRR 2' (r= -0.49). The %HRR was associated to SBP, DBP and HRVT. In summary, the anthropometric variables, BP and cardiac autonomic modulation in the recovery are altered in overweight youth.
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Humanos , Masculino , Femenino , Adulto , Ejercicio Físico , Frecuencia Cardíaca , Obesidad , AntropometríaRESUMEN
A diminuição das concentrações plasmáticas de estrógeno está intimamente relacionada com o aumento do estresse oxidativo e a diminuição da massa muscular em idosos. A terapêutica hormonal estrogênica (THE) e o treinamento de força (TF) apresentam resultados efetivos sobre a manutenção do tecido muscular em idosos. No entanto, os mecanismos responsáveis pelas melhorias induzias por ambas as intervenções são pouco elucidados. Nesse sentido, avaliamos os efeitos da THE, do TF e a associação sobre a manutenção do tecido muscular esquelético de ratas periestropausadas. Ratas Wistar (18 meses) foram distribuídas em: Grupo não treinado (NT-Veh), Grupo NT tratado com a THE (NT-E2), Grupo TF (TF-Veh) e Grupo TF-E2. Os animais receberam a THE (17ß estradiol; 2 x semana; 25 µg/kg/administração) e/ou praticaram TF (3 x semana; 80% sobrecarga) durante 16 semanas. A THE e o TF induzem benefícios ao tecido muscular esquelético de ratas periestropausadas, no entanto, por diferentes maneiras. Enquanto a THE induziu diminuição do estresse oxidativo muscular (Dihidroetidina), o TF resultou em melhoras significativas na função muscular, no sistema antioxidante muscular (Catalase) e na expressão de miRNAs (206, 146b e 133a). Já a interação das intervenções resultou em melhora no estado redox (Sirt1, Sirt3, PGC-1α, COXIV), na responsividade dos receptores estrogênicos (ERα, ERß e GPR30), e atividade de vias de sinalização do tecido muscular (IGF-1/Akt-1/mTOR). Além disso, as intervenções de maneira isolada ou em associação, levaram ao aumento no percentual de fibras glicolíticas e redução das oxidativas. Sugerimos que a aderências das intervenções (associadas ou não) possam minimizar/atenuar a perda da massa muscular observada em fases tardias durante o processo de envelhecimento(AU)
The decrease of estrogen (E2) circulating levels is strongly related to increased oxidative stress and the loss of muscle mass in elderly. The hormone replacement therapy (HRT) and strength training (ST) are the main effective interventions to prevent the loss of muscle mass, however, the mechanisms involved in interventions-induced benefits are not well elucidated. In this sense we evaluate the effect of HRT, ST and association on skeletal muscle maintenance of periestropaused rats. Female Wistar rats (18 months old) were randomly assigned into: non-exercised and non-treated group (NE-Veh), NE treated group (NE-E2), exercised and non-treated group (ST-Veh) and ST-E2 group. The animals received the HRT (17ß estradiol; 2 x week; 50 µg/kg/week) and/or performed ST (3 x week, 80% overload) for 16 weeks. The HRT and ST promoted beneficial effects on skeletal muscle of periestropaused rats, however, by different manners. While HRT treatment leaves the reduction of oxidative stress (Dihidroetidine), the ST resulted in significate improvement on skeletal muscle function, in skeletal muscle antioxidant system (Catalase) and in miRNAs expression (2016, 146b and 133a). Already, the association of interventions resulted in improvement of redox state (Sirt1, Sirt3, PGC-1α, COXIV), in estrogen receptor responsiveness (ERα, ERß and GPR30) and the activity of skeletal muscle signaling pathways (IGF-1/Akt-1/mTOR). In addition, the interventions, isolated or combinated, leaves an increase of the percentage of glycolytic fibers and reduced percentage of oxidative fibers. We suggest that the adherence to interventions (combinated or not) could minimize/attenuate the loss of skeletal muscle mass observed in later phases of aging process(AU)
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Envejecimiento , Estrógenos , Ejercicio Físico , Estrés Oxidativo , SirtuinasRESUMEN
Introdução: Poucos estudos demonstram a ação da hidroterapia no comportamento da ansiedade e depressão em gestantes. Objetivo: Avaliar o efeito da hidroterapia sobre o nível de depressão e ansiedade, além de investigar possíveis associações destes sintomas com perfil sociodemográfico de gestantes. Métodos: Realizou-se avaliação inicial em 19 gestantes, com média de idade de 28,37±4,56 anos, e aplicou-se questionário sobre os níveis de ansiedade e depressão antes e após protocolo de hidroterapia de oito semanas. Resultados: Constatou-se predominância de mulheres casadas (63,15%), no terceiro trimestre gestacional (97,7%), com nível educacional elevado (52,63%). Não houve alterações nos níveis de ansiedade e depressão após intervenção de hidroterapia. Não foram encontradas associações entre perfil sociodemográfico e níveis de ansiedade e depressão. Conclusões: Não houve alterações nos sintomas de ansiedade e depressão das gestantes submetidas à hidroterapia. Além disso, não foram observadas associações entre características sociodemográficas e sintomas de ansiedade e depressão nessa população.
Introduction: Few studies have demonstrated the action of hydrotherapy in the behavior of anxiety and depression in pregnant women. Objective: To evaluate the effect of hydrotherapy on the levels of depression and anxiety; and to investigate possible associations of these symptoms with socio-demographic profile of pregnant women. Methods: An initial assessment was carried out, and also questionnaires about the levels of anxiety and depression before and after eight weeks of hydrotherapy protocol. Results: We evaluated 19 pregnant women who had a mean age of 28.37 ± 4.56 years. It was found a predominance of married women (63.15%) in the third trimester (97.7%), with high educational level (52.63%). There were no changes in the levels of anxiety and depression after hydrotherapy intervention. There were no associations between socio-demographic profile and levels of anxiety and depression. Conclusions: There were no changes in symptoms of anxiety and depression of pregnant women undergoing hydrotherapy. In addition, there were no associations between socio-demographic characteristics and symptoms of anxiety and depression.
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Humanos , Femenino , Embarazo , Adulto , Adulto Joven , Ansiedad/prevención & control , Depresión/prevención & control , Hidroterapia , Ejercicio Físico/psicología , Estudios Prospectivos , Determinantes Sociales de la Salud , Factores SociodemográficosRESUMEN
PURPOSE: This study investigated short-term changes in body composition, handgrip strength, and presence of lymphedema in women who underwent breast cancer surgery. METHODS: Ninety-five women participated in a cross-sectional study, divided into two groups: Control (n=46), with healthy women, and Experimental (n=49), with women six months after breast cancer surgery. The Experimental Group was subdivided into right total mastectomy (RTM, n=15), left total mastectomy (LTM, n=11), right quadrant (RQ, n=13), and left quadrant (LQ, n=10). It was also redistributed among women with presence (n=10) or absence (n=39) of lymphedema. Presence of lymphedema, handgrip strength, and body composition were assessed. RESULTS: Trunk lean mass and handgrip strength were decreased in the Experimental Group. Total lean mass was increased in the LTM compared to RTM or LQ. Left handgrip strength in LTM was decreased compared to RTM and RQ and in LQ compared to RTM and RQ. Finally, total lean mass, trunk fat mass, trunk lean mass, right and left arm lean mass were increased in women with lymphedema. CONCLUSIONS: Breast cancer survivors have changes in their body composition and in handgrip strength six months after surgery; however, the interaction between the type of surgery and its impact is unclear. Furthermore, women who developed lymphedema in this period showed more significant changes in the body composition, but they were not enough to cause impairment in handgrip strength.
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Composición Corporal , Neoplasias de la Mama/cirugía , Fuerza de la Mano , Linfedema/fisiopatología , Complicaciones Posoperatorias/fisiopatología , Estudios Transversales , Femenino , Humanos , Linfedema/etiología , Mastectomía , Persona de Mediana Edad , Complicaciones Posoperatorias/etiología , Factores de TiempoRESUMEN
PURPOSE: This study investigated short-term changes in body composition, handgrip strength, and presence of lymphedema in women who underwent breast cancer surgery. METHODS: Ninety-five women participated in a cross-sectional study, divided into two groups: Control (n=46), with healthy women, and Experimental (n=49), with women six months after breast cancer surgery . The Experimental Group was subdivided into right total mastectomy (RTM, n=15), left total mastectomy (LTM, n=11), right quadrant (RQ, n=13), and left quadrant (LQ, n=10). It was also redistributed among women with presence (n=10) or absence (n=39) of lymphedema. Presence of lymphedema, handgrip strength, and body composition were assessed. RESULTS: Trunk lean mass and handgrip strength were decreased in the Experimental Group. Total lean mass was increased in the LTM compared to RTM or LQ. Left handgrip strength in LTM was decreased compared to RTM and RQ and in LQ compared to RTM and RQ. Finally, total lean mass, trunk fat mass, trunk lean mass, right and left arm lean mass were increased in women with lymphedema. CONCLUSIONS: Breast cancer survivors have changes in their body composition and in handgrip strength six months after surgery; however, the interaction between the type of surgery and its impact is unclear. Furthermore, women who developed lymphedema in this period showed more significant changes in the body composition, but they were not enough to cause impairment in handgrip strength. .
OBJETIVO: Este estudo investigou alterações de curto prazo na composição corporal, na força de preensão palmar e na presença de linfedema em mulheres submetidas à cirurgia do câncer de mama. MÉTODOS: Noventa e cinco mulheres participaram de um estudo transversal, sendo divididas em dois grupos: Controle (n=46), mulheres saudáveis, e Experimental (n=49), mulheres seis meses após cirurgia do câncer de mama. O Grupo Experimental foi subdividido em mastectomia total direita (RTM, n=15), mastectomia total esquerda (LTM, n=11), quadrantectomia direita (RQ, n=13) e quadrantectomia esquerda (LQ, n=10). Também foi redistribuído entre mulheres com presença (n=10) ou ausência (n=39) de linfedema. Foram avaliadas a presença de linfedema, a força de preensão palmar e a composição corporal. RESULTADOS: A massa magra de tronco e a força de preensão palmar estavam diminuídas no Grupo Experimental. Massa magra total estava aumentada na LTM comparada à RTM ou LQ. Força de preensão palmar esquerda na LTM estava diminuída comparada à RTM e RQ e em LQ comparada à RTM e RQ. Finalmente, massa magra total, magra e gorda de tronco e massa magra de braço esquerdo e direito estavam aumentadas em mulheres com linfedema. CONCLUSÕES: Sobreviventes do câncer de mama possuem alterações na composição corporal e na força de preensão palmar seis meses após a cirurgia, porém a interação entre o tipo de cirurgia e seu impacto não está clara. Além disso, mulheres que desenvolveram linfedema neste período mostraram alterações mais significantes na composição corporal, mas que não foram suficientes para causar prejuízo na força de preensão palmar. .
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Femenino , Humanos , Persona de Mediana Edad , Composición Corporal , Neoplasias de la Mama/cirugía , Fuerza de la Mano , Linfedema/fisiopatología , Complicaciones Posoperatorias/fisiopatología , Estudios Transversales , Linfedema/etiología , Mastectomía , Complicaciones Posoperatorias/etiología , Factores de TiempoRESUMEN
This work investigated the effects of co-occurring aflatoxin B1 (AFB1) and microcystin (MC) in aquaculture, using immunohistochemistry and genotoxicity methods. Tilapia (Oreochromis niloticus) were exposed to AFB1 by intraperitoneal and MC (cell extract of Microcystis aeruginosa) by intraperitoneal and immersion routes. The interaction of MC-AFB1 was evaluated co-exposing the intraperitoneal doses. Blood samples were collected after 8, 24, and 48h to analyze the micronucleus frequency and comet score. The interaction of MC-AFB1 showed a synergic mutagenic response by higher micronucleus frequency of co-exposed group. A slight genotoxic synergism was also observed in the comet score. Immunohistochemistry detected MC in al lthe fish liver tissues exposed to MC by intraperitoneal route, and only the immersed group with the highest dose of MC showed a positive response. Although MC was non-detectable in the edible muscle, the combination of immunohistochemistry with genotoxicity assay was an attractive biomonitoring tool in aquaculture, where the animals were frequently exposed to co-occurring synergic hazards.
RESUMEN
This study investigated the role of neonatal sex steroids in rats on sexual dimorphism in bone, as well as on leptin and corticosterone concentrations throughout the lifespan. Castration of males and androgenization of females were used as models to investigate the role of sex steroids shortly after birth. Newborn Wistar rats were divided into four groups, two male groups and two female groups. Male pups were cryoanesthetized and submitted to castration or sham-operation procedures within 24 h after birth. Female pups received a subcutaneous dose of testosterone propionate (100 µg) or vehicle. Rats were euthanized at 20, 40, or 120 postnatal days. Body weight was also measured at 20, 40, and 120 days of age, and blood samples and femurs were collected. The length and thickness of the femurs were measured and the areal bone mineral density (areal BMD) was determined by dual-energy X-ray absorptiometry (DEXA). Biomechanical three-point bending testing was used to evaluate bone breaking strength, energy to fracture, and extrinsic stiffness. Blood samples were submitted to a biochemical assay to estimate calcium, phosphorus, alkaline phosphatase, leptin, and corticosterone levels. Weight gain, areal BMD and bone biomechanical properties increased rapidly with respect to age in all groups. In control animals, skeletal sexual dimorphism, leptin concentration, and dimorphic corticosterone concentration patterns were evident after puberty. However, androgen treatment induced changes in growth, areal BMD, and bone mass properties in neonatal animals. In addition, neonatally-castrated males had bone development and mechanical properties similar to those of control females. These results suggest that the exposure to neonatal androgens may represent at least one covariate that mediates dimorphic variation in leptin and corticosterone secretions. The study indicates that manipulation of the androgen environment during the critical period of sexual differentiation of the brain causes long-lasting changes in bone development, as well as serum leptin and corticosterone concentrations. In addition, this study provides useful models for the investigation of bone disorders induced by hypothalamic hypogonadism.
Asunto(s)
Castración , Corticosterona/metabolismo , Fémur/patología , Leptina/metabolismo , Caracteres Sexuales , Virilismo/sangre , Absorciometría de Fotón , Animales , Animales Recién Nacidos , Fenómenos Biomecánicos , Fenómenos Biofísicos , Peso Corporal , Densidad Ósea , Corticosterona/sangre , Femenino , Fémur/diagnóstico por imagen , Leptina/sangre , Masculino , Radioinmunoensayo , Ratas , Ratas WistarRESUMEN
Os mecanismos envolvidos na adaptação do tecido muscular à prática de exercícios aeróbios, já está bem elucidada em diversos estudos. Essa adaptação ocorre por meio de um processo de reparo desencadeado por dano muscular (processo inflamatório). O objetivo do presente estudo foi avaliar o efeito da suplementação com L-arginina sobre os mecanismos envolvidos na liberação de mediadores inflamatórios e fatores regenerativos do tecido muscular esquelético após uma simples sessão de exercício resistido (ER) de alta intensidade, e avaliar o possível papel protetor da L-arginina sobre os efeitos desencadeados pelo ER no tecido muscular esquelético. Ratos machos Wistar foram divididos em 5 grupos: (grupo controle (C), pós-exercício(0), 8, 24 e 48 horas pós-exercício), suplementados com L-arginina (1 g/kg) uma hora antes do início do exercício, ou aminoguanidina (50 mg/kg) 30 minutos antes do início do treino, ambos por gavagem. Os animais foram submetidos a prática do TR durante 4 dias por meio de uma escada com 80° de inclinação, e com aparato de sobrepeso, correspondentes à 80% do peso corporal de cada animal, acoplado aos animais somente no quarto dia de treinamento. O sangue periférico e o tecido muscular esquelético (extensor digitorum longus) foram coletados para a análise de Mieloperoxidase (MPO), fator de necrose tumoral (TNF-α), citocina-induzida quimiotática para neutrófilos (CINC-2), fator transformador de crescimento (TGF-β), Colágeno tipo 1, Fator de crescimento endotelial vascular (VEGF), creatina quinase (CK), alanina aminotransferase (ALT), aspartato aminotransferase (AST) e a Proteína C Reativa (CRP) por RT-PCR e ELISA. A suplementação com L-arginina promoveu grande redução na migração de neutrófilos no tecido muscular esquelético, na produção de TNF-α, CINC-2 e CRP, e potencializou a produção e expressão dos fatores regenerativos musculares (TGF-β, Colágeno tipo 1 e VEGF). O pré-tratamento com aminoguanidina reverteu o processo. A suplementação com...
The mechanisms involved of muscular adaptation to aerobic exercise have previously been described in several studies. This adaptation occurred through a repair process following tissue damage (inflammatory process). The aim of this study was to analyze the effect of the L-arginine supplementation upon the mechanisms involved on release of inflammatory mediators and regenerative factors of skeletal muscle tissue post a single bout of high intensity of resistance exercise (RE), and evaluate the possible protective role of L-arginine supplementation in the effects of RE in skeletal muscle tissue. Male Wistar rats were divided into 5 groups: (control group (C), post-exercise (0), 8, 24 and 48 hours post-exercise), with L-arginine (1 g/kg) one hour before training began or aminoguanidine (50 mg/kg), 30 minutes before starting training, both by gavage. The animals were subjected to RE practice for four days, through a staircase with 80° tilt, with the overload apparatus corresponding to 80% relative to the body weight on the fourth day. Peripheral blood plasma samples, skeletal muscle (extensor digitorum longus) were collected for analysis of myeloperoxidase (MPO), tumor necrosis factor (TNF-α), cytokine-induced neutrophil chemoattranct-2 (CINC-2), transforming growth factor β (TGF-β), Collagen type 1, vascular endothelial growth factor (VEGF), creatine kinase (CK), alanine aminotransferase (ALT), aspartate aminotransferase (AST) and C-Reactive protein (CRP) by RT-PCR and ELISA. L-arginine promoted a great reduction in neutrophil migration, TNF-α, CINC-2 and CRP, and up-regulated the regenerative factors of skeletal muscle (TGF-β, collagen type 1 and VEGF). Aminoguanidine pre-treatment reversed the process. L-arginine (nitric oxide precursor) supplementation played a protective role in the skeletal muscle tissue and increased the expression of regenerative factors after a high intensity RE session. We suggest that this protection is related to the nitric oxide (NO)...