RESUMO

ABSTRACT People living with HIV (PLH), who use antiretroviral therapy (ART), are more susceptible to changes in the inflammatory profile and oxidative stress, and women have greater access to ART. Although physical exercise is a complementary strategy to treatment due to its antioxidant and anti-inflammatory effects, it is not clear whether acute responses to exercise can be harmful to PLH. The aim of the study was to investigate the acute effect of resistance exercise (RE) on inflammatory and oxidative stress markers in PLH. Ten women, using ART, performed RE session consisting of seven exercises for the whole body. For biochemical evaluation, blood samples were collected before (pre), 1 hour (1h) and 2 hours (2h) after the RE session. One-way ANOVA followed by Bonferroni's post hoc test was used to compare results between time points. There was an increase only in markers, GSSG of 160% (pre: 0.40 ± 0.11; 1h: 1.18 ± 0.36; 2h: 1.04 ± 0.25 mmol/g), TNF-α of 98 % (pre: 4.60 ± 0.55; 1h: 6.95 ± 0.77; 2h: 9.10 ± 1.03 pg/ml) and 52% IL-6 (pre: 2.47 ± 0 .67; 1h: 3.63 ± 1.26; 2h: 5.38 ± 2.15 pg/ml). The other variables remained unchanged (P > 0.05). It is concluded that a RE session increased the levels of inflammatory markers and oxidative stress in PLH in a non-exacerbated way.

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RESUMO Pessoas vivendo com HIV (PVH), que utilizam a terapia antirretroviral (TARV), são mais suscetíveis a alterações no perfil inflamatório e estresse oxidativo, sendo que as mulheres possuem maior acesso à TARV. Embora o exercício físico seja uma estratégia complementar ao tratamento devido aos seus efeitos antioxidantes e anti-inflamatórios, não está claro se as respostas agudas ao exercício podem ser prejudiciais às PVH. O objetivo do estudo foi investigar o efeito agudo de exercícios com pesos (EP) sobre marcadores inflamatórios e de estresse oxidativo em PVH. Dez mulheres, em uso da TARV, realizaram uma sessão de EP constituída por sete exercícios para o corpo todo. Para avaliação bioquímica, amostras de sangue foram coletadas antes (pré), 1 hora (1h) e 2 horas (2h) após a sessão de EP. A ANOVA one-way seguida do teste post hoc de Bonferroni foi utilizada para comparação dos resultados entre os momentos. Houve aumento apenas nos marcadores, GSSG de 160% (pré: 0,40 ± 0,11; 1h: 1,18 ± 0,36; 2h:1,04 ± 0,25 mmol/g), TNF-α de 98% (pré: 4,60 ± 0,55; 1h: 6,95 ± 0,77; 2h: 9,10 ± 1,03 pg/ml) e IL-6 de 52% (pré: 2,47 ± 0,67; 1h: 3,63 ± 1,26; 2h: 5,38 ± 2,15 pg/ml). As demais variáveis permaneceram sem alterações (P > 0,05). Conclui-se que uma sessão de EP aumentou os níveis de marcadores inflamatórios e estresse oxidativo em PVH de forma não exacerbada.

Assuntos

Humanos , Feminino , Adulto , Mulheres , Exercício Físico/fisiologia , Infecções por HIV/diagnóstico , Estresse Oxidativo , Citocinas , Radicais Livres , Anti-Inflamatórios , Antioxidantes

RESUMO

The aim of this study is to verify the influence of the intensity on muscle and hepatic glycogen depletion and recovery kinetics of Wistar rats, submitted to three acute training sessions with equalized loads. 81 male Wistar rats performed an incremental test to determine maximal running speed (MRS) and divided into 4 groups: baseline group (Control; n = 9); low intensity training session (GZ1; n = 24; 48 minutes at 50% of MRS); moderate intensity group (GZ2; n = 24; 32 minutes at 75% of MRS) and high intensity group (GZ3; n = 24; 5x5 minutes and 20 seconds at 90% of MRS). Immediately after the sessions and after 6, 12 and 24 hours, 6 animals from each subgroup were euthanized for glycogen quantification in soleus and EDL muscles and liver. A Two-Way ANOVA and the Fisher's Post-hoc test was used (p < 0.05). Glycogen supercompensation occurred between 6 and 12 hours after exercise in muscle tissue and 24 after exercise in the liver. The muscle and hepatic glycogen depletion and recovery kinetics are not modulated by exercise intensity since the load was equalized, but effects were distinct in different tissues. Hepatic glycogenolysis and muscle glycogen synthesis processes seem to run in parallel.

RESUMO

In the last years, it has become evident that both acute and chronic physical exercise trigger responses/adaptations in the purinergic signaling and these adaptations can be considered one important mechanism related to the exercise benefits for health improvement. Purinergic system is composed of enzymes (ectonucleotidases), receptors (P1 and P2 families), and molecules (ATP, ADP, adenosine) that are able to activate these receptors. These components are widely distributed in almost all cell types, and they respond/act in a specific manner depending on the exercise types and/or intensities as well as the cell type (organ/tissue analyzed). For example, while acute intense exercise can be associated with tissue damage, inflammation, and platelet aggregation, chronic exercise exerts anti-inflammatory and anti-aggregant effects, promoting health and/or treating diseases. All of these effects are dependent on the purinergic signaling. Thus, this review was designed to cover the aspects related to the relationship between physical exercise and purinergic signaling, with emphasis on the modulation of ectonucleotidases and receptors. Here, we discuss the impact of different exercise protocols as well as the differences between acute and chronic effects of exercise on the extracellular signaling exerted by purinergic system components. We also reinforce the concept that purinergic signaling must be understood/considered as a mechanism by which exercise exerts its effects.

Assuntos

Trifosfato de Adenosina/metabolismo , Adenosina/metabolismo , Exercício Físico/fisiologia , Receptores Purinérgicos/metabolismo , Transdução de Sinais/fisiologia , Animais , Humanos

RESUMO

Neutrophil extracellular traps (NETs) represent an innate organism defense mechanism characterized by neutrophil release of intracellular material to capture any aggressor agent. Elevated NETs release is associated with increased inflammatory response and related diseases, such as obesity. Chronic physical training is one of the main strategies to treat and prevent obesity. The relationship between physical training and NETs is still under study. The present review, followed by a bioinformatics analysis, demonstrates the meaningful connection between physical exercise, obesity, and NETs. The bioinformatics indicated TNF-α as a leading gene after the ontological analysis followed by positive-interleukin-6 regulation, chemokines, and inflammatory response regulation. The main results pointed to a relevant regulatory effect of physical training on NETs release, indicating physical exercise as a possible therapeutic target on modulating NETs and inflammation.

Assuntos

Exercício Físico/genética , Inflamação/genética , Obesidade/genética , Fator de Necrose Tumoral alfa/genética , Biologia Computacional , Armadilhas Extracelulares/genética , Humanos , Inflamação/fisiopatologia , Inflamação/terapia , Neutrófilos/metabolismo , Obesidade/fisiopatologia , Obesidade/terapia

RESUMO

PURPOSE: There is growing evidence of an association between physical activity and a reduced risk of cancer and cancer recurrence. The aim of this study was to assess the effects of exercise-conditioned human serum (HS) effects on the proliferative and tumorigenic potential of triple-negative breast cancer (TNBC) and prostate cancer (PC) cells. Moreover, modulated mechanisms and several physiological factors that can predict exercise effects were investigated. METHODS: Thirty healthy sedentary subjects were recruited for the study. The subjects performed two high-intensity endurance cycling (HIEC) sessions before and after a nine-week period of high-intensity interval training (HIIT). Cell tumorigenic capacity affected by HS collected before (t0), immediately after (t1), 4 h (t2), and 24 h (t3) after the HIEC sessions was evaluated by in vitro three-dimensional colony formation. The modulation of molecular pathways was analyzed by western blotting and qPCR in TNBC and PC cells, and in TNBC xenografts in exercised mice. RESULTS: All of the HIEC-conditioned HS (t1, t2, and t3) markedly impacted the proliferative and the microtumor-forming capacity of both TNBC and PC cell lines, while the HS collected from the subjects at rest did not. Modulation of the Hippo and Wnt/ß-catenin pathways by HIEC-conditioned HS before and after the period of HIIT was shown. Multiple linear regression analysis showed relationships between the effects of HIEC-conditioned HS in PC cells, lactate threshold and VO2max. CONCLUSIONS: These results highlight the potential of HIEC bouts in tumor progression control and the importance of optimizing an approach to identify physiological predictors of the effects of acute exercise in tertiary cancer prevention.

Assuntos

Ciclismo/fisiologia , Proliferação de Células/fisiologia , Treinamento Intervalado de Alta Intensidade , Neoplasias da Próstata/patologia , Neoplasias de Mama Triplo Negativas/patologia , Animais , Linhagem Celular Tumoral , Meios de Cultivo Condicionados , Progressão da Doença , Feminino , Glicogênio Sintase Quinase 3 beta/metabolismo , Via de Sinalização Hippo , Humanos , Masculino , Camundongos , Proteína Quinase 1 Ativada por Mitógeno/metabolismo , Proteína Quinase 3 Ativada por Mitógeno/metabolismo , Fosforilação , Neoplasias da Próstata/prevenção & controle , Proteínas Serina-Treonina Quinases/metabolismo , Distribuição Aleatória , Análise de Regressão , Comportamento Sedentário , Prevenção Terciária , Fatores de Tempo , Neoplasias de Mama Triplo Negativas/prevenção & controle , Ensaio Tumoral de Célula-Tronco/métodos , Via de Sinalização Wnt , Adulto Jovem

RESUMO

Unaccustomed exercise involving eccentric contractions, high intensity, or long duration are recognized to induce delayed-onset muscle soreness (DOMS). Myocyte damage and inflammation in affected peripheral tissues contribute to sensitize muscle nociceptors leading to muscle pain. However, despite the essential role of the spinal cord in the regulation of pain, spinal cord neuroinflammatory mechanisms in intense swimming-induced DOMS remain to be investigated. We hypothesized that spinal cord neuroinflammation contributes to DOMS. C57BL/6 mice swam for 2 h to induce DOMS, and nociceptive spinal cord mechanisms were evaluated. DOMS triggered the activation of astrocytes and microglia in the spinal cord 24 h after exercise compared to the sham group. DOMS and DOMS-induced spinal cord nuclear factor κB (NFκB) activation were reduced by intrathecal treatments with glial inhibitors (fluorocitrate, α-aminoadipate, and minocycline) and NFκB inhibitor [pyrrolidine dithiocarbamate (PDTC)]. Moreover, DOMS was also reduced by intrathecal treatments targeting C-X3-C motif chemokine ligand 1 (CX3CL1), tumor necrosis factor (TNF)-α, and interleukin (IL)-1ß or with recombinant IL-10. In agreement, DOMS induced the mRNA and protein expressions of CX3CR1, TNF-α, IL-1ß, IL-10, c-Fos, and oxidative stress in the spinal cord. All these immune and cellular alterations triggered by DOMS were amenable by intrathecal treatments with glial and NFκB inhibitors. These results support a role for spinal cord glial cells, via NFκB, cytokines/chemokines, and oxidative stress, in DOMS. Thus, unveiling neuroinflammatory mechanisms by which unaccustomed exercise induces central sensitization and consequently DOMS.

RESUMO

O treinamento de força (TF) demonstra importante impacto para melhora e/ou manutenção da aptidão física. Programas de TF tem como principal objetivo o aumento de força e da área de secção transversa. Essas adaptações crônicas do TF são induzidas por vias de sinalização para otimizar o aumento da área de secção transversa. Portanto, a interação entre as variáveis do TF torna possível uma prescrição adequada dos programas. Sendo algumas das variáveis do TF definidas pela seleção dos exercícios, volume, intensidade, intervalo entre séries, velocidade de execução (cadência), ordem dos exercícios, ação muscular, frequência semanal. O objetivo do presente estudo foi verificar quais variáveis do TF são manipuladas nas planilhas de treinamento, nas academias da região metropolitana de Campinas (RMC). O estudo contou com a participação de 114 academias da RMC do estado de São Paulo (SP). Foi verificada através de inspeção visual as variáveis do TF exercícios, volume, intensidade, intervalo entre séries, velocidade de execução, ordem dos exercícios, ação muscular e frequência semanal presente nas planilhas de treinamento, além da quantidade de funcionários envolvidos durante o processo de prescrição e monitoramento do TF. Os resultados do presente estudos demonstram que as variáveis exercício, volume, intensidade e ordem dos exercícios estão presente em 100% das planilhas de treinamento, enquanto que menos de 50% das planilhas de treinamento apresentam as variáveis intervalo entre séries, velocidade de execução e ação muscular. Os achados do presente estudo sugerem concluir que as principais variáveis do TF não são manipuladas nas planilhas de treinamento das academias da RMC.(AU)

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Resistance training (RT) demonstrates important impact to improving and/or maintaining physical fitness. RT program has as main purpose the increase of strength and cross-sectional area. These chronic adaptations are induced by signaling pathways to optimize the increase of cross-sectional area. Therefore, the interaction between RT variables makes it possible a adequate prescription of program. Some of the RT variables are defined by exercises selection, volume, intensity, intervals between set, speed of execution, exercises order, muscle action, weekly frequency. The purpose of present study was verify which RT variables are manipulated in training worksheets, in fitness center of metropolitan region of Campinas (MRC). The study counted with the participation of 114 fitness center of MRC of São Paulo (SP) state. It was verified through visual inspection the RT variables exercises, volume, intensity, intervals between set, speed of execution, exercises order, muscle action, weekly frequency, besides the quantity of employed involved during prescription process and monitoring the RT. The results of the present study demonstrate that variables exercise, volume, intensity and exercise order are present in 100% of training worksheets, while less 50% of training worksheets exhibited the variables intervals between sets, speed of execution and muscle action. The findings of present study suggest conclude that the main RT variables are not manipulated in training of worksheets of fitness center of MRC.(AU)

Assuntos

Humanos , Masculino , Feminino , Exercício Físico , Academias de Ginástica , Treinamento Resistido , Músculos , Educação Física e Treinamento , Aptidão Física , Prescrições

RESUMO

Alzheimer's disease is a progressive neurodegenerative pathological process that causes memory loss and cognitive impairment. One of the pathological characteristics of Alzheimer's disease is the amyloid-ß protein aggregation on the brain. The regular practice of physical exercise is a consolidated strategy on the prevention of cognitive deficits; however, little is known about the effects of acute exercise on memory. We hypothesize that one physical exercise session could act as a modulator of learning. Here we investigated the effects of one single session of running (aerobic) or strength (anaerobic) exercise on memory deficits related to neurotoxicity induced by amyloid-ß. Male Wistar rats were submitted to stereotaxic surgery to intrahippocampal infusion of amyloid-ß protein or saline (control). Ten days after the surgery the rats were submitted to the object recognition (OR) memory task. Immediately after the OR learning session, some rats were submitted to one treadmill running or strength exercise session. Then, the animals were submitted to memory tests 24 h, 7, and 14 days after the OR learning. We demonstrated that one physical exercise session, both aerobic as anaerobic, performed after learning improves learning and memory, promoting memory persistence in control rats and memory consolidation in rats submitted to amyloid-ß neurotoxicity model. Notably, the effects of the aerobic exercise session seem to be more prominent, since they also reflect in an improvement of object discrimination index for 7 days in control animals. We verified that the mechanisms involved in the effects of aerobic exercise include the dopaminergic system activation. The mechanisms involved in the anaerobic exercise effects seem to be others since no alterations on hippocampal dopamine or noradrenaline levels were detected.

Assuntos

Doença de Alzheimer , Peptídeos beta-Amiloides/toxicidade , Transtornos Cognitivos/induzido quimicamente , Condicionamento Físico Animal/fisiologia , Reconhecimento Psicológico/fisiologia , Animais , Masculino , Condicionamento Físico Animal/métodos , Ratos , Ratos Wistar

RESUMO

ABSTRACT Introduction: Systemic arterial hypertension is a disease that mainly affects women. Objective: This study aimed to verify the hypotensive effect and blood pressure reactivity in women submitted to a concurrent cross exercise (CC) session. Methods: Fifteen volunteers (54±3) performed aerobic exercise alternated with a series of weights exercises, for the analysis of blood pressure variation (by the oscillometric method) and pressure reactivity (by the Cold pressure test) before and after exercise. Results: The results demonstrated the occurrence of post-exercise hypotension in the systolic phase in the comparison between CC and C post-exercise (−11.65 mmHg). CC led to attenuation of 7mmHg and 4mmHg for SBP and DBP, respectively, in the blood pressure reactivity after one session. Conclusion: It is concluded that concurrent cross exercise ensures hypotension and positive reactivity of systolic blood pressure. Level of evidence II; Therapeutic studies-Investigating the results of treatment.

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RESUMO Introdução: A hipertensão arterial sistêmica é uma doença que acomete, principalmente, mulheres. Objetivo: O presente estudo teve como objetivo verificar o efeito hipotensor e a reatividade da pressão arterial em mulheres submetidas a uma sessão de exercício concorrente cruzado (CC). Métodos: Quinze voluntárias (54±3) realizaram exercício aeróbico alternado com uma série de exercícios com peso para a análise da variação da pressão arterial (através do método oscilométrico) e reatividade pressórica (através do Cold pressure test) pré- e pós-exercício. Resultados: Os resultados demonstraram a ocorrência da hipotensão pós-exercício na fase sistólica na comparação entre CC e C pós- exercício (−11,65mmHg). O CC provocou a atenuação de 7 mmHg e 4 mmHg para PAS e PAD, respectivamente, na reatividade pressórica após uma sessão. Conclusão: Conclui-se que o exercício concorrente cruzado garante hipotensão e reatividade positiva da pressão arterial sistólica. Nível de evidência II; Estudos terapêuticos-Investigação dos resultados do tratamento.

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RESUMEN Introducción: La hipertensión arterial sistémica es una enfermedad que afecta principalmente a las mujeres. Objetivo: El presente estudio tuvo como objetivo verificar el efecto hipotensor y la reactividad de la presión arterial en mujeres sometidas a una sesión de ejercicio concurrente cruzado (CC). Métodos: Quince voluntarias (54 ± 3) realizaron ejercicio aeróbico alternando con una serie de ejercicios con peso para el análisis de la variación de la presión arterial (a través del método oscilométrico) y reactividad presórica (a través del Cold Pressure Test) pre y post ejercicio. Resultados: Los resultados demostraron la ocurrencia de hipotensión post ejercicio en la fase sistólica en comparación entre CC y C post ejercicio (−11,65mmHg). El CC provocó la atenuación de 7 mmHg y 4 mmHg para PAS y PAD, respectivamente, en la reactividad presórica después de una sesión. Conclusión: Se concluye que el ejercicio concurrente cruzado garantiza hipotensión y reactividad positiva de la presión arterial sistólica. Nivel de evidencia II; Estudios terapéuticos-Investigación de los resultados del tratamiento.

RESUMO

The aim of this study was to evaluate the acute effect of aerobic (AER) and eccentric (ECC) exercise on glucose variability, correlating it with circulating markers of inflammation and oxidative stress in healthy subjects. Sixteen healthy subjects (32 ± 12 years old) wore a continuous glucose monitoring system for three days. Participants randomly performed single AER and ECC exercise sessions. Glucose variability was evaluated by glucose variance (VAR), glucose coefficient of variation (CV%) and glucose standard deviation (SD). Blood samples were collected to evaluate inflammatory and oxidative stress markers. When compared with the pre-exercise period of 0-6 h, all the indices of glucose variability presented comparable reductions 12-18 h after both exercises (∆AER: VAR= 151.5, ∆CV% = 0.55 and ∆SD = 3.1 and ECC: ∆VAR = 221.2 , ∆CV% = 3.7 and ∆SD = 6.5). Increased interleukin-6 (IL-6) levels after AER (68.5%) and ECC (30.8%) (P<0.001) were observed, with no differences between sessions (P = 0.459). Uric acid levels were increased after exercise sessions (3% in AER and 4% in ECC, P = 0.001). In conclusion, both AER and ECC exercise sessions reduced glucose variability in healthy individuals. Inflammatory cytokines, such as IL-6, and stress oxidative markers might play a role in underlying mechanisms modulating the glucose variability responses to exercise (clinicalTrials.gov NCT02262208).

RESUMO

PURPOSE: Interleukin 10 (IL-10) is a cytokine that plays a critical role with potent anti-inflammatory properties when produced during exercise, limiting host immune response to pathogens and preventing tissue damage. The purpose of this systematic review was to assess the response of IL-10 after acute exercise session in healthy adults. METHODS: Databases of Ovid Medline (1978-2016), CINAHL (1998-2016), EMBASE (2003-2016), SportDiscus (1990-2016), and Web of Science library (1990-2016) were carefully screened. Clinical trials comparing exercise types in healthy individuals were included for pooled analysis. The trials of exercise were methodologically appraised by PEDro Scale. RESULTS: Twelve randomized controlled and crossover trials containing 176 individuals were identified for inclusion. The Kruskal-Wallis test showed no significant differences between type of exercise and the corresponding values in IL-10 [X2(4) = 2.878; p = 0.449]. The duration of exercise was significantly correlated with increase in IL-10 changes (Pearson's r = 1.00, 95%CI: 0.015-0.042, p < 0.0001) indicating that 48% of the variation in IL-10 levels can be explained by the duration of the exercise performed. In addition, despite a linear increase, we did not find a significant correlation with the intensity of exercise and IL-10 changes (Pearson's r = 0.218, 95%CI: -0.554-0.042, p < 0.035). CONCLUSION: Overall, the duration of the exercise is the single most important factor determining the magnitude of the exercise-induced increase of plasma IL-10.

Assuntos

Exercício Físico/fisiologia , Interleucina-10/sangue , Adulto , Biomarcadores/sangue , Feminino , Humanos , Inflamação/sangue , Inflamação/imunologia , Inflamação/fisiopatologia , Inflamação/prevenção & controle , Interleucina-10/imunologia , Masculino , Ensaios Clínicos Controlados Aleatórios como Assunto , Fatores de Tempo , Regulação para Cima , Adulto Jovem

RESUMO

Resumo Este estudo teve por objetivo comparar os efeitos do exercício agudo com carga de trabalho relativa em gastrocnêmio de ratos Wistar com três e 18 meses. Os animais foram divididos em quatro grupos (n = 6): controle de três e 18 meses; exercício de três e 18 meses. Os grupos exercitados foram submetidos a uma única sessão de corrida na esteira com 60 minutos em velocidade de 0,8 km/h e 1,2 km/h. Foram analisados parâmetros do metabolismo (níveis de lactato, conteúdo de glicogênio, níveis de succinato desidrogenase, citocromo c oxidase e de estresse oxidativo (SOD, CAT e GPX). Os resultados mostraram um aumento nos marcadores metabólicos após o exercício agudo independentemente da idade dos animais e similaridade nos danos oxidativos apesar de as enzimas antioxidantes apresentarem modulação diferenciada nos animais mais velhos em comparação com animais jovens.

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Abstract The effects of exercise on the generation of reactive oxygen species and the response to muscle oxidative stress determines longevity. This study compares the effects of acute exercise with similar relative workload in rats with 3 and 18 months. The animals were divided into four groups (n = 6): control 3-months; exercise 3-months; control 18-months and exercise 18-months. Exercised groups underwent to a single bout of running with 60 minutes in the speed 0.8 km/h (18 months) and 1.2 km/h (3 months). Metabolic parameters (lactate levels, glycogen content, succinate dehydrogenase levels, cytochrome c oxidase) and oxidative stress (activity of superoxide dismutase, catalase and glutathione peroxidase). The results showed an increase in metabolic markers after acute exercise regardless of the age and similarity in oxidative damage even if the antioxidant enzymes are age-dependent. These results suggest that the effects of acute exercise at moderate intensity, affects the metabolism independent of age, and, that the differential response in enzymatic antioxidant system between groups do not promote protection against oxidative damage.

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Este estudio ha tenido como objetivo comparar los efectos del ejercicio agudo con carga de trabajo relativamente similar en el gastrocnemio de ratas Wistar con 3 y 8 meses. Se separó a los animales en cuatro grupos (n = 6): control de 3 y 18 meses, y ejercicio de 3 y 18 meses. Se sometió a los grupos de ejercicio a una sola sesión de carrera en la cinta durante 60 minutos con una velocidad de 0,8 km/h y 1,2 km/h. Se analizaron algunos parámetros del metabolismo (niveles de lactato, contenido de glucógeno, niveles de succionato-deshidrogenasa, citocromo c-oxidasa e de estrés oxidativo [superóxido-dismutasa, catalasa y glutatión-peroxidasa]). Los resultados mostraron un aumento de los marcadores metabólicos después del ejercicio agudo independientemente de la edad de los animales y la similitud de los daños oxidativos aunque las enzimas antioxidantes presentan modulación diferenciada en animales viejos en comparación con animales jóvenes.

RESUMO

PURPOSE: We aimed to determine the effects of different intensities of acute exercise on Hcy plasma levels, and the exercise-induced changes in Hcy liver metabolism. METHOD: First, thirty-two Wistar rats were randomly submitted to an acute bout of swimming exercise carrying a load of 2% (n=8), 4% (n=8) and 6% (n=8) of their total body weight attached in their tail. Control rats remained rested (n=8). Blood samples were taken from tail vein for plasma S-containing amino acids determination before (Rest) and post, 1, 2, 3, 4, 6, and 10h after acute swimming exercise. Second, 56 exercised rats (4% loads) were euthanized before (Rest) and1, 2, 3, 4, 6, and 10h after acute swimming exercise. Blood and liver samples were collected for amino acids and keys genes involved in the Hcy metabolism assay. RESULTS: Acute exercise increases (P<0.05) plasma Hcy concentration in an intensity-dependent manner (rest 7.7±0.8; 6% load 13.8±3.6; 4% load 12.2±2.9±and 2% load 10.1±2.6, µmol/L); this increase is transient and does not promote hyperhomocysteinemia (<15µmol/L).Exercise-induced increased plasma Hcywas accompanied by the decreased liver S-adenosylmethionine/S-adenosylhomocysteine ratio and elevated MAT1a mRNA content. Acute exercise also caused elevated mRNA of key enzymes of transsulfuration (CBS) and remethylation (BHMT and the MTRR). CONCLUSION: Our data provided evidence that acute exercise increases plasma Hcy concentration due to the augmented requirement for methylated compounds that increases liver SAM consumption. Also, Hcy remethylation and transsulfuration are coordinately regulated to maintain methyl balance.

Assuntos

Homocisteína/sangue , Fígado/metabolismo , Condicionamento Físico Animal/fisiologia , Animais , Peso Corporal/efeitos dos fármacos , Hiper-Homocisteinemia/metabolismo , Masculino , Metionina Adenosiltransferase/metabolismo , Metilação , Ratos , Ratos Wistar , S-Adenosil-Homocisteína/metabolismo , S-Adenosilmetionina/metabolismo , Natação/fisiologia

RESUMO

The aims of this study were 1) to characterize the intensity of the vibration stimulation in women diagnosed with fibromyalgia (FM) compared to a control group of healthy women (HW) matched by age and anthropometric parameters, and 2) to investigate the effect of a single session of whole body vibration (WBV) on inflammatory responses. Levels of adipokines, soluble tumor necrosis factor receptors (sTNFr1, sTNFr2), and brain-derived neurotrophic factor (BDNF) were determined by enzyme-linked immunosorbent assay. Oxygen consumption (VO2) was estimated by a portable gas analysis system, heart rate (HR) was measured using a HR monitor, and perceived exertion (RPE) was evaluated using the Borg scale of perceived exertion. Acutely mild WBV increased VO2 and HR similarly in both groups. There was an interaction (disease vs vibration) in RPE (P=0.0078), showing a higher RPE in FM compared to HW at rest, which further increased in FM after acute WBV, whereas it remained unchanged in HW. In addition, there was an interaction (disease vs vibration) in plasma levels of adiponectin (P=0.0001), sTNFR1 (P=0.000001), sTNFR2 (P=0.0052), leptin (P=0.0007), resistin (P=0.0166), and BDNF (P=0.0179). In conclusion, a single acute session of mild and short WBV can improve the inflammatory status in patients with FM, reaching values close to those of matched HW at their basal status. The neuroendocrine mechanism seems to be an exercise-induced modulation towards greater adaptation to stress response in these patients.

Assuntos

Humanos , Feminino , Pessoa de Meia-Idade , Vibração , Exercício Físico , Fibromialgia/sangue , Fibromialgia/terapia , Mediadores da Inflamação/sangue , Consumo de Oxigênio/fisiologia , Ensaio de Imunoadsorção Enzimática , Biomarcadores/sangue , Estudos de Casos e Controles , Interleucina-8/sangue , Receptores do Fator de Necrose Tumoral/sangue , Fator Neurotrófico Derivado do Encéfalo/sangue , Leptina/sangue , Resistina/sangue , Adipocinas/sangue , Frequência Cardíaca/fisiologia , Inflamação/sangue , Inflamação/terapia

RESUMO

We previously found that acute exercise inhibited the gastric emptying of liquid in awake rats by causing an acid-base imbalance. In the present study, we investigated the involvement of the nitric oxide-cyclic guanosine monophosphate (NO-cGMP) pathway, vasoactive intestinal peptide (VIP), and corticotropin-releasing factor (CRF) peptide in this phenomenon. Male rats were divided into exercise or sedentary group and were subjected to a 15-min swim session against a load (2.5 or 5% b.w.). The rate of gastric emptying was evaluated after 5, 10, or 20 min postprandially. Separate groups of rats were treated with vehicle (0.9% NaCl, 0.1 mL/100 g, ip) or one of the following agents: atropine (1.0 mg/kg, ip), the NO non-selective inhibitor Nω-nitro-L-arginine methyl ester hydrochloride (L-NAME; 10.0 mg/kg, ip), or the selective cGMP inhibitor 1H-(1,2,4)oxadiazole[4,3-a]quinoxalin-1-one (ODQ; 5.0 mg/kg, ip), the i-NOS non-specific inhibitor (aminoguanidine; 10.0 mg/kg, ip), the corticotropin-releasing factor receptor antagonist (astressin; 100 µg/kg, ip), or the vasoactive intestinal peptide (VIP) receptor antagonist Lys1, Pro2,5, Arg3,4, Tyr6 (100 µg/kg, ip). Compared to sedentary rats, both the 2.5 and 5% exercise groups exhibited higher (P<0.05) values of blood lactate and fractional gastric dye recovery. Corticosterone and NO levels increased (P<0.05) in the 5% exercised rats. Pretreatment with astressin, VIP antagonist, atropine, L-NAME, and ODQ prevented the increase in gastric retention caused by exercise in rats. Acute exercise increased gastric retention, a phenomenon that appears to be mediated by the NO-cGMP pathway, CRF, and VIP receptors.

Assuntos

Animais , Masculino , Hormônio Liberador da Corticotropina/metabolismo , Guanosina Monofosfato/metabolismo , Esvaziamento Gástrico/fisiologia , Óxido Nítrico/metabolismo , Valores de Referência , Atropina/farmacologia , Fatores de Tempo , Corticosterona/sangue , Hormônio Liberador da Corticotropina/antagonistas & inibidores , Hormônio Liberador da Corticotropina/farmacologia , Distribuição Aleatória , Ratos Wistar , Inibidores Enzimáticos/farmacologia , Esvaziamento Gástrico/efeitos dos fármacos

RESUMO

Peroxisome proliferator-activated receptors (PPARs) play a major role in metabolism and inflammatory control. Exercise can modulate PPAR expression in skeletal muscle, adipose tissue, and macrophages. Little is known about the effects of PPAR-α in metabolic profile and cytokine secretion after acute exercise in macrophages. In this context, the aim of this study was to understand the influence of PPAR-α on exercise-mediated immune metabolic parameters in peritoneal macrophages. Mice C57BL/6 (WT) and PPAR-α knockout (KO) were examined in non-exercising control (n = 4) or 24 hours after acute moderate exercise (n = 8). Metabolic parameters (glucose, non-esterified fatty acids, total cholesterol [TC], and triacylglycerol [TG]) were assessed in serum. Cytokine concentrations (IL-1ß, IL-6, IL-10, TNF-α, and MCP-1) were measured from peritoneal macrophages cultured or not with LPS (2.5 µg/mL) and Rosiglitazone (1 µM). Exercised KO mice exhibited low glucose concentration and higher TC and TG in serum. At baseline, no difference in cytokine production between the genotypes was observed. However, IL-1ß was significantly higher in KO mice after LPS stimulus. IL-6 and IL-1ß had increased concentrations in KO compared with WT, even after exercise. MCP-1 was not restored in exercised KO LPS group. Rosiglitazone was not able to reduce proinflammatory cytokine production in KO mice at baseline level or associated with exercise. Acute exercise did not alter mRNA expression in WT mice. CONCLUSION: PPAR-α seems to be needed for metabolic glucose homeostasis and anti-inflammatory effect of acute exercise. Its absence may induce over-expression of pro-inflammatory cytokines in LPS stimulus. Moreover, moderate exercise or PPAR-γ agonist did not reverse this response.

Assuntos

Inflamação/metabolismo , PPAR alfa/deficiência , Condicionamento Físico Animal , Animais , Colesterol/sangue , Glucose/metabolismo , Homeostase , Inflamação/induzido quimicamente , Lipopolissacarídeos , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , PPAR alfa/genética , Triglicerídeos/sangue

RESUMO

The aim of this study was to investigate the physiological responses to moderate-intensity continuous and high-intensity intermittent exercise. Twelve physically active male subjects were recruited and completed a 5-km run on a treadmill in two experimental sessions in randomized order: continuously (70% sVO2max) and intermittently (1:1 min at sVO2max). Oxygen uptake, excess post-exercise oxygen consumption, lactate concentration, heart rate and rating of perceived exertion data were recorded during and after each session. The lactate levels exhibited higher values immediately post-exercise than at rest (High-Intensity: 1.43 ± 0.25 to 7.36 ± 2.78; Moderate-Intensity: 1.64 ± 1.01 to 4.05 ± 1.52 mmol⋅L-1, p = 0.0004), but High-Intensity promoted higher values (p = 0.001) than Moderate-Intensity. There was a difference across time on oxygen uptake at all moments tested in both groups (High-Intensity: 100.19 ± 8.15L; Moderate-Intensity: 88.35 ± 11.46, p < 0.001). Both exercise conditions promoted increases in excess postexercise oxygen consumption (High-Intensity: 6.61 ± 1.85 L; Moderate-Intensity: 5.32 ± 2.39 L, p < 0.005), but higher values were observed in the High-Intensity exercise protocol. High-Intensity was more effective at modifying the heart rate and rating of perceived exertion (High-Intensity: 183 ± 12.54 and 19; Moderate-Intensity: 172 ± 8.5 and 16, respectively, p < 0.05). In conclusion, over the same distance, Moderate-Intensity and High-Intensity exercise exhibited different lactate concentrations, heart rate and rating of perceived exertion. As expected, the metabolic contribution also differed, and High-Intensity induced higher energy expenditure, however, the total duration of the session may have to be taken into account. Moreover, when following moderate-intensity training, the percentage of sVO2max and the anaerobic threshold might influence exercise and training responses.

RESUMO

OBJECTIVE: Studies have suggested that even a single session of physical exercise enhances executive functions. ADHD is among the most common developmental disorders in childhood, but little is known about alternative treatments for this disorder. Therefore, we performed a systematic review of the literature to analyze articles that evaluated the executive functions of children with ADHD after an acute exercise session. METHOD: We reviewed articles indexed in the PubMed, American Psychiatric Association (APA) psychNET, Scopus, and Web of Knowledge databases between 1980 and 2013. RESULTS: Of 231 articles selected, only three met the inclusion criteria. CONCLUSION: Based on these 3 articles, we concluded that 30 min of physical exercise reportedly improved the executive functions of children with ADHD. Due to the small number of articles selected, further studies are needed to confirm these benefits.

Assuntos

Transtorno do Deficit de Atenção com Hiperatividade/terapia , Transtornos Cognitivos/terapia , Função Executiva/fisiologia , Terapia por Exercício/métodos , Adolescente , Transtorno do Deficit de Atenção com Hiperatividade/psicologia , Criança , Pré-Escolar , Cognição/fisiologia , Humanos

RESUMO

Aerobic exercise promotes short-term physiological changes in the intestinal smooth muscle associated to the ischemia-reperfusion process; however, few studies have demonstrated its effect on the intestinal contractile function. Thus, this work describes our observations regarding the influence of acute aerobic swimming exercise in the contractile reactivity, oxidative stress, and morphology of rat ileum. Wistar rats were divided into sedentary (SED) and acutely exercised (EX-AC) groups. Animals were acclimated by 10, 10, and 30 min of swimming exercise in intercalated days 1 week before exercise. Then they were submitted to forced swimming for 1 h with a metal of 3% of their body weight attached to their body. Animals were euthanized immediately after the exercise section and the ileum was suspended in organ baths for monitoring isotonic contractions. The analysis of lipid peroxidation was performed in order to determinate the malondialdehyde (MDA) levels as a marker of oxidative stress, and intestinal smooth muscle morphology by histological staining. Cumulative concentration-response curves to KCl were altered in the EX-AC with an increase in both its efficacy and potency (E max = 153.2 ± 2.8%, EC 50 = 1.3 ± 0.1 × 10(-2) M) compared to the SED group (E max = 100%, EC 50 = 1.8 ± 0.1 × 10(-2) M). Interestingly, carbachol had its efficacy and potency reduced in the EX-AC (E max = 67.1 ± 1.4%, EC 50 = 9.8 ± 1.4 × 10(-7) M) compared to the SED group (E max = 100%, EC 50 = 2.0 ± 0.2 × 10(-7) M). The exercise did not alter the MDA levels in the ileum (5.4 ± 0.6 µ mol/mL) in the EX-AC compared to the SED group (8.4 ± 1.7 µ mol/mL). Moreover, neither the circular nor the longitudinal smooth muscle layers thickness were modified by the exercise (66.2 ± 6.0 and 40.2 ± 2.6 µm, respectively), compared to the SED group (61.6 ± 6.4 and 34.8 ± 3.7 µm, respectively). Therefore, the ileum sensitivity to contractile agents is differentially altered by the acute aerobic swimming exercise, without affecting the oxidative stress and the morphology of ileum smooth muscle.

RESUMO

OBJECTIVE: The study was to investigate the effects of creatine (Cr) supplementation on oxidative stress markers and anaerobic performance in rats. METHODS: Sixty-four rats (Wistar) were divided into two groups: C, anaerobic exercised group (n = 32) and Cr, anaerobic exercised group supplemented with creatine (n = 32). Cr supplementation consisted of the addition of 2% Cr monohydrate to the diet. After 28 days, the rats performed acute exercise (6 × 30 seconds of vertical jumps in the water with 30 seconds rest and 50% of total body weight load attached in the back). The animals were euthanized before (pre) and at 0, 2, and 6 hours (n = 8) after acute exercise. RESULTS: Acute exercise induced an increase in plasma malondialdehyde (MDA) and advanced oxidation protein products (AOPP), as well as increased total lipid hydroperoxides and AOPP in gastrocnemius muscle. Cr supplementation inhibited the formation of MDA and lipid hydroperoxides in plasma. However, the antioxidant action of Cr was observed only against AOPP in gastrocnemius muscle. Cr supplementation also increased (P < 0.05) anaerobic performance compared to the C group. CONCLUSION: Cr supplementation is able to inhibit the increase in plasma lipid peroxidation markers induced by high-intensity and short-duration exercise in rats; equivalent actions, however, were not observed fully in muscle tissue.