Host defense peptides combined with MTA extract increase the repair in dental pulp cells: in vitro and ex vivo study.

Host Defense Peptides (HDPs) have, in previous studies, been demonstrating antimicrobial, anti-inflammatory, and immunomodulatory capacity, important factors in the repair process. Knowing these characteristics, this article aims to evaluate the potential of HDPs IDR1018 and DJK-6 associated with MTA extract in the repair process of human pulp cells. Antibacterial activity of HDPs, MTA and HDPs combined with MTA in Streptococcus mutans planktonic bacteria and antibiofilm activity was evaluated. Cell toxicity was assayed with MTT and cell morphology was observed by scanning electron microscopy (SEM). Proliferation and migration of pulp cells were evaluated by trypan blue and wound healing assay. Inflammatory and mineralization related genes were evaluated by qPCR (IL-6, TNFRSF, DSPP, TGF-ß). Alkaline phosphatase, phosphate quantification and alizarin red staining were also verified. The assays were performed in technical and biological triplicate (n = 9). Results were submitted for the calculation of the mean and standard deviation. Then, normality verification by Kolmogorov Smirnov test, analyzing one-way ANOVA. Analyses were considered at a 95% significance level, with a p-value < 0.05. Our study demonstrated that HDPs combined with MTA were able to reduce biofilms performed in 24 h and biofilm performed over 7 days S. mutans biofilm (p < 0.05). IDR1018 and MTA, as well as their combination, down-regulated IL-6 expression (p < 0.05). Tested materials were not cytotoxic to pulp cells. IDR1018 induced high cell proliferation and combined with MTA induced high cellular migration rates in 48 h (p < 0.05). Furthermore, the combination of IDR1018 and MTA also induced high expression levels of DSPP, ALP activity, and the production of calcification nodules. So, IDR-1018 and its combination with MTA could assist in pulp-dentine complex repair process in vitro.

Protective role of intergenerational paternal resistance training on fibrosis, inflammatory profile, and redox status in the adipose tissue of rat offspring fed with a high-fat diet.

AIMS: We evaluated the role of intergenerational paternal exercise on fibrosis, inflammatory profile, and redox status in the adipose tissue of male rat offspring fed with high-fat diet (HFD) and explored to what extent programming affects the systemic metabolic profile. MAIN METHODS: Adult wistar rats were randomly divided into two groups: sedentary fathers and trained fathers (8 weeks of resistance training (RT), three times per week). The offspring were obtained by mating with sedentary females. Upon weaning, male offspring were divided into four groups (7 animals per group): offspring of sedentary fathers exposed to either a control diet (SFO-C) or a high-fat diet (SFO-HF); offspring of trained fathers exposed to a control diet (TFO-C) or a high-fat diet (TFO-HF). KEY FINDINGS: Paternal RT was effective in attenuating body weight gain, adipocyte size, collagen deposition, as well as downregulating genes (CTGF, VEGF, C/EBPα SREBP1, MCP-1, and NF-kB), pro-inflammatory cytokine levels (Tumor Necrosis Factor alpha and Interleukin-1-beta), matrix metalloproteinase -2 activity, and ROS production in the epididymal adipose tissue of offspring fed with HFD (TFO-HF vs. SFO-HF; P < 0.05). Moreover, paternal RT increased adiponectin and superoxide dismutase (SOD) activity in the tissue. These beneficial effects were accompanied by the increase of antioxidant enzymes (SOD and α-Klotho), while decreasing pro-oxidant agents (F2-isoprostanes, protein carbonyls levels), and metabolic markers (insulin and leptin, HOMA-ß, and HOMA-IR) in the offspring blood circulation. SIGNIFICANCE: Our findings reveal protective effects of intergenerational paternal RT on adipose tissue remodeling and metabolic health of offspring fed with HFD.

High-protein diet associated with resistance training reduces cardiac TNF-α levels and up-regulates MMP-2 activity in rats.

The consumption of high-protein diets (HPD) is associated with resistance training (RT) due to effects on metabolism. However, little is known about these effects on cardiac tissue. This study aimed to investigate effects of HPD and RT on cardiac biomarkers. 18 rats were divided into normo-protein (NPD), and HPD groups: NPD-Control, NPD-RT, HPD-Control, and HPD-RT. Interleukin-6 (IL-6), tumour necrosis factor alpha (TNF-a), nitric oxide (NO), activity of metalloproteinase-2 (MMP-2), and vascular factor (VEGF) were analysed. RT was effective in regulating body weight, increasing strength, and reducing food consumption (p < .05). HPD induces higher levels of interleukin 6 (p = .0169), and lowers NO (p < .0001). When associated with RT, the HPD decreases levels of tumour necrosis factor alpha, while enhances NO, and MMP activity (p < .05). The association of RT with HDP decreases inflammatory parameters and indicates an enhancement in the molecular parameters of cardiac tissue.

Host defense peptides clavanins A and MO reduce in vitro osteoclastogenesis

Aim: Several systemic diseases, such as periodontitis and apical periodontitis, can cause extensive bone resorption. Host defense peptides may have the potential for the development of novel therapies for the bone resorption process. This study evaluated the potential of host defense peptides clavanins A, MO, and LL-37 in in vitro osteoclastogenesis. Methods: RAW 264.7 cultures were stimulated with recombinant of receptor activator of nuclear factor kappa B ligand in the presence of different tested concentrations of host defense peptides, besides calcium hydroxide and doxycycline. Cellular viability, nitric oxide production, and a number of differentiated osteoclast-like cells were also evaluated. Results: Results showed that none of the substances were cytotoxic, except for 128 µg.mL-1 of doxycycline after 3 days. Host defense peptides, calcium hydroxide, and doxycycline did not interfere in nitric oxide production or downregulated it. An exception was observed in the presence of 2 µg.mL-1 of doxycycline, in which nitric oxide production was up-regulated. All host defense peptides were capable of reducing osteoclast-like cell differentiation. Conclusion: Host defense peptides clavanins A and MO demonstrated to be potential suppressors of osteoclastogenesis in vitro without interfering in cellular viability and nitric oxide production. These promising results need to be further analyzed in in vivo models of bone resorption

Physical Activity Level, Anthropometric and Cardiovascular Profile Among Students in Sergipe State Attending Public Schools

Abstract Background Cardiovascular diseases are the leading cause of mortality among adults. Evidence has shown that sedentary behaviors are the main preventable outcome, however, many sedentary children also become sedentary adults. Therefore, identifying potential risk factors as early as possible contributes to therapeutic success. Objective To achieve an anthropometric and cardiovascular mapping of school-age students from Sergipe State, Brazil. Methods A school-based cross-sectional study with a representative sample from public schools in the state of Sergipe (n= 4700). Anthropometric and blood pressure measurements were performed, and the Global School-based Student Health Survey was used to assess the physical activity level. An independent samples t-test was performed for all comparisons, and significance was established at 5% (p<0.05). Results Despite showing mean blood pressure values within reasonable limits (SBP = 114.1±12.4 mm Hg and DBP = 66.3±8.1 mm Hg), school-age students did not comply with global recommendations for health promotion. It was also observed a high rate of low body weight (42.6%), suggesting dietary compromises, which can interfere with the development of this population. In addition, only 7.3% of students met the minimum physical activity criteria proposed for maintaining their health status. Conclusion The findings of the present study emphasize the importance of maintaining Physical Education classes as an essential curricular component, since they provide several health benefits and ensure that this population reaches the minimum daily recommendations, preventing diseases in adult life. (Int J Cardiovasc Sci. 2020; [online].ahead print, PP.0-0)

Antimicrobial and immunomodulatory in vitro profile of double antibiotic paste.

AIM: To evaluate the antimicrobial and immunomodulatory activity of double antibiotic paste (DAP) in an in vitro infection model. METHODOLOGY: The minimum inhibitory and bactericidal concentrations (MIC and MBC) and the antibiofilm activities (TTC assay) of DAP and its components (ciprofloxacin and metronidazole) were evaluated against Staphylococcus aureus and Enterococcus faecalis compared with triple antibiotic paste (TAP). The cellular viability of RAW 264.7 macrophages (24 and 72 h) and L929 fibroblasts (48 and 72 h) was evaluated by MTT. Furthermore, the production of TNF-α, IL-12, IL-6, IL-1α, IL-10 and NO (on RAW 264.7), besides IL-6, TGF-ß and NO (on L929), stimulated with DAP in baseline and associated with heat-killed microbial-antigen conditions was measured by ELISA and Griess reaction. Data were analysed using the one-way ANOVA test with Bonferroni's corrections. RESULTS: The MBC of pharmacopoeia DAP was similar to TAP for E. faecalis (0.25 µg.  mL-1 ) and lower for S. aureus (DAP 1 µg. mL-1 and TAP 2 µg. mL-1 ; p < .001). Ciprofloxacin was the most effective antibiofilm drug from the pastes (35% of reduction for E. faecalis and S. aureus; p < .0001), and both pastes had a similar antibiofilm eradication against both biofilm species (29% and 35% for S. aureus and 76% and 85% for E. faecalis; p < .0001). DAP was cytotoxic against the tested cells. DAP significantly upregulated IL-1α (p < .001), IL-6 (p < .0001), TNF-α (p < .01) and IL-12 (p < .05; in the absence of antigens) and significantly reduced IL-6 (p < .0001; in the presence of HK-S. aureus) and IL-10 (p < .05; in the presence of both antigens) on macrophages. Furthermore, DAP upregulated IL-6 (p < .001) and NO (p < .05; in the absence of antigens), IL-6 (p < .001; in the presence of HK-S. aureus) and reduced NO (p < .001; in the presence of HK-S. aureus). CONCLUSIONS: Double antibiotic paste and TAP had similar antimicrobial activity against S. aureus and E. faecalis. DAP upregulated pro-inflammatory cytokines mainly in the absence of antigens and had pro- and anti-inflammatory activity in RAW 264.7 macrophages and L929 fibroblasts in the presence of antigens involved in pulp infections.

Systemic conditions of diabetic patients diagnosed with apical periodontitis / Condições sistêmicas de pacientes diabéticos diagnosticados com periodontite apical

ABSTRACT Objective: This study aimed to evaluate the association between glycemic control status in type 2 diabetes mellitus (T2DM) patients and apical periodontitis. Methods: Twenty-seven patients were involved in this study. The survey was based on anamnesis, intra and extra oral examination and radiographic evaluation. Diabetes mellitus information involved type of diabetes and blood glucose analysis. Patients were divided according to their metabolic control status (glycemic controlled and poorly controlled T2DM patients). Results: A higher fasting blood glucose level (p = 0.004) and a higher percentage of HbA1c (p = 0.0001) were demonstrated in poorly controlled T2DM patients when compared to glycemic controlled T2DM. However, the frequency of apical periodontitis and the elapsed time since diabetes mellitus diagnosis were higher in controlled T2DM patients, reaching 64%. Nevertheless, controlled T2DM patients presented a higher number of apical periodontitis cases (p < 0.05). Findings support that controlled patients T2DM presented higher presence of apical periodontitis than poorly controlled T2DM ones. In these patients, the time elapsed since the diagnosis was higher, which may have provided a longer period of oscillation and/or uncontrolled metabolism. Conclusions: Therefore, it might contribute to the development and maintenance of apical periodontitis in glycemic controlled patients of this study.

RESUMO Objetivo: Este estudo objetivou avaliar a associação entre o estado de controle glicêmico em pacientes com diabetes mellitus tipo 2 (DM2) e a periodontite apical. Métodos: Vinte e sete pacientes foram envolvidos neste estudo. A pesquisa baseou-se na anamnese, exame intra e extraoral e avaliação radiográfica. As informações sobre o diabetes mellitus envolveram o tipo de diabetes e a análise da glicose sanguínea. Os pacientes foram divididos de acordo com seu estado de controle metabólico (pacientes com DM2 com controle glicêmico e pacientes com DM2 mal controlados). Resultados: Um maior nível de glicose em jejum (p = 0,004) e uma maior porcentagem de HbA1c (p = 0,0001) foram demonstrados em pacientes com DM2 mal controlada quando comparados com DM2 com controle glicêmico. Porém, a frequência de periodontite apical e o tempo decorrido desde o diagnóstico de diabetes mellitus foram maiores nos pacientes com DM2 controlado, chegando a 64%. No entanto, os pacientes com DM2 controlada apresentaram um maior número de casos de periodontite apical (p < 0,05). Os achados suportam que pacientes controlados com DM2 apresentam maior presença de periodontite apical do que pacientes com DM2 mal controlada. Nesses pacientes, o tempo decorrido desde o diagnóstico foi maior, o que pode ter proporcionado um período maior de oscilação e/ou metabolismo descontrolado. Conclusão: Portanto, pode contribuir para o desenvolvimento e manutenção da periodontite apical nos pacientes com controle glicêmico deste estudo.

Reflexões sobre o viés de publicação: um guia para praticantes de estatística para a análise de dados e uso inapropriado do coeficiente de correlação em ciências da saúde / Reflexions on publication bias: a guide for statisticians practitioners to data analysis and critical use of correlation coefficient in health sciences

A utilização de procedimentos estatísticos é de fundamental importância para a interpretação apropriada de um conjunto de dados. Desta forma, a baixa aderência do teste aos dados selecionados pode levar a conclusões inadequadas. Portanto, a escolha do teste paramétrico e não paramétrico para dados pareados deve levar em conta a normalidade dos dados. Com isso, aplicar o coeficiente de correlação de Pearson (teste paramétrico) em dados não paramétricos aumenta as chances de associações espúrias (por acaso ou erro sistemático), as quais resultam em erro do Tipo I. Entendendo que as vezes o pensamento do jovem pesquisador e também de editores de periódicos científicos serão guiados por resultados positivos. É comum a possibilidade de editores selecionarem artigos para publicação tendo como base o valor de p <0,05. Contudo, também seria importante selecionar os artigos levando em consideração os cumprimentos dos pressupostos para a utilização de testes paramétricos e não-paramétricos. Com isso, objetivo do presente estudo foi abordar os dois testes de coeficiente de correlação de Pearson e Spearman e sugerir recomendações para praticantes de estatística na área de Ciências da Saúde para a utilização segura e adequada dos dados antes da publicação.(AU)

The use of statistical procedures is of fundamental importance for the proper interpretation of data analysis. In this way, the low adherence of the test to the selected data can lead to inadequate conclusions. Therefore, the choice of parametric and non-parametric tests for paired data should take into account the normality of the data. Therefore, applying the Pearson correlation coefficient (non-parametric test) in non-parametric data increases the chances of spurious associations (by chance or systematic error), which result in a Type I error. Knowing that young researcher and editors of scientific journals might be guided by positive results. It is common for editors to select articles for publication based on p < 0.05 value. However, it would also be important to select papers taking into account the fulfillment of the assumptions for the use of parametric and non-parametric tests. Thus, the aim of the present study was to address the two Pearson and Spearman correlation coefficient tests and to suggest recommendations for practitioners of statistics in the area of Health Sciences for the safe and adequate use of data prior publication.(AU)

Paternal Resistance Training Modulates Calcaneal Tendon Proteome in the Offspring Exposed to High-Fat Diet.

The increase in high-energy dietary intakes is a well-known risk factor for many diseases, and can also negatively impact the tendon. Ancestral lifestyle can mitigate the metabolic harmful effects of offspring exposed to high-fat diet (HF). However, the influence of paternal exercise on molecular pathways associated to offspring tendon remodeling remains to be determined. We investigated the effects of 8 weeks of paternal resistance training (RT) on offspring tendon proteome exposed to standard diet or HF diet. Wistar rats were randomly divided into two groups: sedentary fathers and trained fathers (8 weeks, three times per week, with 8-12 dynamic movements per climb in a stair climbing apparatus). The offspring were obtained by mating with sedentary females. Upon weaning, male offspring were divided into four groups (five animals per group): offspring from sedentary fathers were exposed either to control diet (SFO-C), or to high-fat diet (SFO-HF); offspring from trained fathers were exposed to control diet (TFO-C) or to a high-fat diet (TFO-HF). The Nano-LC-MS/MS analysis revealed 383 regulated proteins among offspring groups. HF diet induced a decrease of abundance in tendon proteins related to extracellular matrix organization, transport, immune response and translation. On the other hand, the changes in the offspring tendon proteome in response to paternal RT were more pronounced when the offspring were exposed to HF diet, resulting in positive regulation of proteins essential for the maintenance of tendon integrity. Most of the modulated proteins are associated to biological pathways related to tendon protection and damage recovery, such as extracellular matrix organization and transport. The present study demonstrated that the father's lifestyle could be crucial for tendon homeostasis in the first generation. Our results provide important insights into the molecular mechanisms involved in paternal intergenerational effects and potential protective outcomes of paternal RT.

Omics and the molecular exercise physiology.

Exercise is a well-known non-pharmacologic agent used to prevent and treat a wide range of pathologic conditions such as metabolic and cardiovascular disease. In this sense, the classic field of exercise physiology has determined the main theoretical and practical bases of physiologic adaptations in response to exercise. However, the last decades were marked by significant advances in analytical laboratory techniques, where the field of biochemistry, genetics and molecular biology promoted exercise science to enter a new era. Regardless of its application, whether in the field of disease prevention or performance, the association of molecular biology with exercise physiology has been fundamental for unveiling knowledge of the molecular mechanisms related to the adaptation to exercise. This chapter will address the natural evolution of exercise physiology toward genetics and molecular biology, emphasizing the collection of integrated analytical approaches that composes the OMICS and their contribution to the field of molecular exercise physiology.

Paternal Resistance Training Induced Modifications in the Left Ventricle Proteome Independent of Offspring Diet.

Ancestral obesogenic exposure is able to trigger harmful effects in the offspring left ventricle (LV) which could lead to cardiovascular diseases. However, the impact of the father's lifestyle on the offspring LV is largely unexplored. The aim of this study was to investigate the effects of 8 weeks of paternal resistance training (RT) on the offspring left ventricle (LV) proteome exposed to control or high-fat (HF) diet. Wistar rats were randomly divided into two groups: sedentary fathers and trained fathers (8 weeks, 3 times per week with weights secured to the animals' tails). The offspring were obtained by mating with sedentary females. Upon weaning, male offspring were divided into 4 groups (5 animals per group): offspring from sedentary fathers, exposed to control diet (SFO-C); offspring from trained fathers, exposed to control diet (TFO-C); offspring from sedentary fathers, exposed to high-fat diet (SFO-HF); and offspring from trained fathers, exposed to high-fat diet (TFO-HF). The LC-MS/MS analysis revealed 537 regulated proteins among groups. Offspring exposure to HF diet caused reduction in the abundance levels of proteins related to cell component organization, metabolic processes, and transport. Proteins related to antioxidant activity, transport, and transcription regulation were increased in TFO-C and TFO-HF as compared with the SFO-C and SFO-HF groups. Paternal RT demonstrated to be an important intervention capable of inducing significant effects on the LV proteome regardless of offspring diet due to the increase of proteins involved into LV homeostasis maintenance. This study contributes to a better understanding of the molecular aspects involved in transgenerational inheritance.

Proteomic changes in skeletal muscle of aged rats in response to resistance training.

Sarcopenia is a multifactorial process defined by loss of strength and skeletal muscle mass, which leads to a reduction in muscle cross-sectional area (CSA). Although resistance training (RT) has been indicated as a tool to counteract sarcopenia, the protein profile associated with skeletal muscle adaptations remains to be determined. We investigated the effects of 12 weeks of RT on the skeletal muscle proteome profile and CSA of young and older rats. Twenty-four animals were divided into four groups: young sedentary or trained and older sedentary or trained (six animals per group). A 12-week RT protocol was performed, which consisted of climbing a vertical ladder. The proteins from the gastrocnemius were analysed by LC-ESI-MS/MS. One-hundred and thirty-one proteins were identified, of which 28 were assessed between the groups. Ageing induced an increase in proteins associated with the glycolytic pathway, transport and stress response, which represent crucial mechanisms for muscle adaptation. RT upregulated metabolic enzymes, anti-oxidant activity and transport proteins, besides increasing hypertrophy, regardless of age, suggesting a beneficial adaptation to mitigate age-related sarcopenia. RT reduced muscle atrophy through the regulation of stress response and by increasing proteins related to energy production and transport, which in turn might protect tissue damage arising from exercise and ageing. SIGNIFICANCE OF THE STUDY: Protein abundance levels related to the metabolic process and stress response were increased in the aged muscle. RT proved to be an important intervention capable of inducing significant effects on muscle proteome regardless of ageing, due to upregulation of glycolytic enzymes, and anti-oxidant and transport proteins. This effect could lead to a beneficial adaptation in muscle structure, cellular function and overall homeostasis maintenance. This study contributes to better understanding of the basic biology of ageing and clarifies more profoundly the molecular networks behind physiological adaptations promoted by exercise training. Therefore, the results open new perspectives and insights for studies based on transcriptomics, metabolomics and functional assays.

High-intensity aerobic training lowers blood pressure and modulates the renal renin-angiotensin system in spontaneously hypertensive rats.

Background: This study aimed to verify the effects of high-intensity aerobic training (HIAT) on BP control and renin-angiotensin system (RAS) components in renal tissue of SHR. Ten SHRs received HIAT or control for 8-weeks. At the end of the training, the SBP showed a reduction of ~ 30mmHg (p < .01) in HIAT and increased by ~ 15 mmHg in the  control group. HIAT resulted in a higher release of nitrite, IL-6, ACE2 and ATR2. These results indicated an association between BP, NO and renal RAS.Abbreviations: JAA: writing, carried out all experimental procedures, performed statistical analysis, original draft and revised manuscript DMS: data interpretation, formal analysis, writing, editing and revised manuscript BAP: carried all experimental procedures, revised manuscritpt CPCG: carried all experimental procedures, revised manuscritpt MEN: experimental procedures, revised manuscript and data interpretation RWP: drafted and revised manuscript RCA: writing, experimental procedures, revised manuscript JP: writing, data interpretation and revised manuscript OLF: writing, original draft and revised manuscript.

Enterococcus faecalis and Staphylococcus aureusstimulate nitric oxide production in macrophages and fibroblasts in vitro

Aim: Nitric oxide (NO) is an important mediator related to damage of the pulp tissue and at the same time to regenerative pulp processes. However, it is not clear how common endodontic microorganisms can regulate this mediator. This study aimed to investigate NO production by macrophages and fibroblasts against Enterococcus faecalis- and Staphylococcus aureus-antigens. Methods: RAW 264.7 macrophages and L929 fibroblast cell lines were stimulated with different heat-killed (HK) antigen concentrations (105-108 colony forming units - CFU) from E. faecalis and S. aureus with or without interferon-gamma (IFN-γ). Cell viability by MTT colorimetric assay and NO production from the culture supernatants were evaluated after 72 h. Results: Data here reported demonstrated that none of the antigen concentrations decreased cell viability in macrophages and fibroblasts. The presence of HK-S. aureus and HK-E. faecalis antigen- stimulated NO production with or without IFN-γ on RAW 264.7. The HK-S. aureus antigen stimulated NO production in L929 fibroblasts with or without IFN-γ, and the highest concentration of HK-E. faecalis with IFN-γ also stimulated NO production by these cells. Conclusion: The amount of NO produced by macrophages and fibroblasts may be involved in the concentration and type of prevalent endodontic microorganisms, generating new answers for the understanding of pulpal revascularization/regeneration processes

Effects of different volumes of resistance exercise on the food intake of rats / Efeitos de diferentes volumes de exercício de resistência sobre o consumo alimentar de ratos / Efectos de diferentes volúmenes de ejercicio de resistencia sobre el consumo alimentario de ratas

ABSTRACT Introduction: Physical exercise changes food intake after an acute session; however further research is needed to identify the effects of resistance exercise (RE) with different training volumes. Objective: To investigate the effects of acute RE (two sessions) with different training volumes on the food intake of rats. Methods: Twenty four Wistar rats were randomly divided into three groups: control group (who did not perform RE; n=8); RE (stair climbing) with four series (G4, n=8) and overload of 50%, 75%, 90%, and 100% of the maximum load capacity of the animal and RE with eight series (G8; n=8) with two increases of each overload of 50%, 75%, 90%, and 100% of the maximum load capacity of the animal. The average amount of ingested feed was measured for each experimental group 24 and 48 hours after the first RE session and 72 hours after the second RE session. Results: The food intake of the groups that performed the RE session was significantly lower (p<0.05) when compared to the control group only at 24 hours after the first training session. After the second training session (72 h), the G8 showed a significantly lower food intake (p<0.05) when compared to G4 and the control group. However, the food consumption relative to the body mass of the animals (g/gBM) was significantly lower only after the second training session (72 h) in G8 (p<0.05) compared to G4 and the control group. Conclusion: Therefore, the resistance exercise decreases the food intake of rats after an acute session; in addition, a higher training volume seems to be more advantageous. Level of Evidence II; Therapeutic studies - Investigation of treatment results.

RESUMO Introdução: O exercício físico altera o consumo alimentar nas horas subsequentes a uma sessão aguda; no entanto, são necessárias novas investigações com o propósito de identificar os efeitos do exercício de resistência (ER) realizado com diferentes volumes de treinamento. Objetivo: Investigar os efeitos do ER agudo (duas sessões) com diferentes volumes de treinamento sobre o consumo alimentar de ratos. Métodos: Foram utilizados vinte e quatro ratos Wistar, divididos aleatoriamente em três grupos: grupo controle (que não realizaram ER; n = 8); ER (escaladas na escada) com quatro séries (G4; n = 8) e sobrecarga de 50%, 75%, 90% e 100% da capacidade máxima de carga do animal e ER com oito séries (G8; n = 8) com duas elevações de cada sobrecarga de 50%, 75%, 90% e 100% da capacidade máxima de carga do animal. A quantidade média de ração ingerida foi medida para cada grupo experimental 24 e 48 horas após a primeira sessão de ER e 72 horas após a segunda sessão de ER. Resultados: O consumo alimentar dos grupos que realizaram a sessão de ER foi significativamente menor (p < 0,05) quando comparado ao grupo controle apenas nas 24 horas após a primeira sessão de treinamento. Após a segunda sessão de treinamento (72 h), o G8 apresentou um consumo alimentar significativamente menor (p < 0,05) quando comparado ao G4 e ao grupo controle. Entretanto, o consumo alimentar relativo à massa corporal dos animais (g/gMC) foi significativamente menor apenas após a segunda sessão de treinamento (72 h) no G8 (p < 0,05) comparado com o G4 e o grupo controle. Conclusão: Assim sendo, o exercício de resistência diminui a ingestão alimentar de ratos após uma sessão aguda, além disso, um maior volume de treino parece ser mais vantajoso. Nível de evidência II; Estudos terapêuticos - Investigação dos resultados do tratamento.

RESUMEN Introducción: El ejercicio físico altera el consumo de alimentos en las horas posteriores a una sesión aguda; sin embargo, son necesarias nuevas investigaciones con el propósito de identificar los efectos del ejercicio de resistencia (ER) realizado con diferentes volúmenes de entrenamiento. Objetivo: Investigar los efectos del ER agudo (dos sesiones) con diferentes volúmenes de entrenamiento sobre el consumo alimentario de ratas. Métodos: Se utilizaron 24 ratas Wistar, divididas aleatoriamente en tres grupos: grupo control (que no realizaron ER; n = 8); ER (subidas en la escalera) con cuatro series (G4, n = 8) y sobrecarga de 50%, 75%, 90% y 100% de la capacidad máxima de carga del animal y ER con ocho series (G8; n = 8) con dos elevaciones de cada sobrecarga del 50%, 75%, 90% y 100% de la capacidad máxima de carga del animal. La cantidad promedio de ración ingerida se midió para cada grupo experimental 24 y 48 horas después de la primera sesión de ER y 72 horas después de la segunda sesión. Resultados: El consumo de alimentos de los grupos que llevaron a cabo la sesión de ER fue significativamente menor (p < 0,05) en comparación con el grupo control sólo en las 24 horas después de la primera sesión de entrenamiento. Después de la segunda sesión de entrenamiento (72 h), el G8 presentó un consumo alimentario significativamente menor (p < 0,05) en comparación con el G4 y el grupo control. Sin embargo, la ingesta de alimentos relativa a la masa corporal de los animales (g/gMC) fue significativamente menor sólo después de la segunda sesión de entrenamiento (72 h) en el G8 (p < 0,05) en comparación con el G4 y el grupo control. Conclusión: Por lo tanto, el ejercicio de resistencia disminuye la ingesta de alimentos de ratas después de la sesión aguda; además, un mayor volumen de entrenamiento parece ser más ventajoso. Nivel de Evidencia II; Estudios terapéuticos - Investigación de los resultados del tratamiento.

Beneficial effects of resistance training on the protein profile of the calcaneal tendon during aging.

The calcaneal tendon (CT) is the most commonly injured tendon in the human body. Moreover, with advancing age, the amount of damage increases further. Resistance training (RT) could be used to minimize such damages. The aim of the present study was to obtain the identification, detailed protein cataloging and biochemical characterization based on the effects of the aging process and the RT in CT of rats. The analysis by liquid chromatography tandem-mass spectrometry showed 142 distinct proteins, however, only 29 proteins met the inclusion criteria and were analyzed. Aging causes a reduction in the abundance of seven proteins related to extracellular matrix organization, biological regulation and cellular processes. However, RT promoted the positive regulation of proteins important for the maintenance of healthy tendons: seven proteins in young trained and two in older trained group. This study contributes to a better understanding of molecular aspects of the tendon. The down regulation of proteins linked to mechanical function and extracellular matrix remodeling of the tendon during aging can contribute to the increase of injury and weakness in the tendon. Nevertheless, RT proved to be a tool to prevent these adverse effects during aging by increasing proteins involved in the functionality of the tendon.

Suplementação com amêndoa de bacuri na composição corporal de ratos submetidos ao exercício / Supplementation with bacuri almond in the body composition of rats submitted to the exercise / Suplementación de almendra del bacuri en la composición corporal de ratas sometidas a ejercicio

RESUMO Introdução: A proteína da amêndoa do bacuri (Attalea phalerata Mart. Ex Spreng) e da whey protein (WP) têm quantidades relevantes de aminoácidos essenciais e são de boa digestibilidade, características que têm sido buscadas por atletas para auxílio para melhorar a composição corporal, particularmente quando associadas a exercícios. Objetivo: Avaliar o efeito de dietas com teor proteico vegetal e animal sobre a composição corporal de ratos Wistar submetidos ao exercício resistido em escada. Métodos: Quarenta ratos machos recém-desmamados foram submetidos a um período de adaptação com dieta comercial (4 semanas) e treinamento resistido durante oito semanas (três vezes por semana), recebendo dietas com farinha de bacuri e whey protein. Foram distribuídos randomicamente em seis grupos: G1 (bacuri sedentário), G2 (bacuri exercitado), G3 (WP sedentário), G4 (WP exercitado), G5 (controle sedentário) e G6 (controle exercitado). Avaliou-se consumo da dieta, peso corporal, comprimento, circunferências torácica e abdominal para calcular o índice de Lee e o índice de massa corporal; os sítios com gordura foram retirados após eutanásia. A análise estatística foi realizada por ANOVA e Teste de Tukey, considerando 5% de significância. Resultados: O peso final do G3 (372 ± 8,86 g) foi superior ao do G2 (326,83 ± 15,03 g) e do G6 (316,75 ± 5,90 g); os grupos que receberam dieta com farinha de bacuri consumiram quantidade superior de dieta, porém, tiveram menor peso final; não diferiram no índice de Lee e no IMC, sítios com gordura e índice de adiposidade com relação aos grupos tratados com WP, apresentando valores inferiores das circunferências torácica e abdominal. Com relação às gorduras e índice de adiposidade, não houve diferença entre os grupos sedentários e exercitados. Conclusão: A proteína da amêndoa de bacuri mostrou-se de boa qualidade quando comparada com a whey protein, havendo possibilidade de recomendação de seu uso na elaboração de suplementos nutricionais, como fonte vegetal alternativa e de baixo custo.

ABSTRACT Introduction: The bacuri almond protein (Attalea phalerata Mart. Ex Spreng) and whey protein (WP) have significant amounts of essential amino acids and are of good digestibility, characteristics that have been sought by athletes to aid in improving body composition, particularly when associated with exercises. Objective: To evaluate the effect of diets with vegetable and animal protein content on the body composition of Wistar rats submitted to resisted ladder exercise. Methods: Forty male newly weaned rats were exposed to a period of adaptation to a commercial diet (4 weeks) and resistance training for eight weeks (three times a week), receiving diets with bacuri flour and whey protein. They were randomly assigned to 6 groups: G1 (sedentary bacuri), G2 (exercised bacuri), G3 (sedentary WP), G4 (exercised WP), G5 (sedentary control) and G6 (exercised control). Dietary intake, body weight, length, thoracic and abdominal circumferences were evaluated to calculate Lee index and body mass index; the fat sites were removed after euthanasia. Statistical analysis was performed by ANOVA and Tukey's test, considering a 5% significance level. Results: The final weight of G3 (372±8.86 g) was higher than those of G2 (326.83±15.03 g) and G6 (316.75±5.90 g); the groups that received diet with bacuri flour consumed higher amount of food, however, they had lower final weight, did not differ in the Lee index and BMI, fat sites and adiposity index in relation to the groups treated with WP, presenting lower values in the thoracic and abdominal circumferences. Regarding fat and adiposity index, there was no difference between the sedentary and exercised groups. Conclusion: The bacuri almond protein showed good quality when compared to whey protein, and it is possible to recommend its use in the preparation of nutritional supplements as an alternative and low cost vegetable protein source.

RESUMEN Introducción: La proteína de la almendra del bacuri (Attalea phalerata Mart ex Spreng) y proteína del suero de la leche (whey protein - WP) tienen cantidades significativas de aminoácidos esenciales y son de buena digestibilidad, características que han sido buscadas por atletas para ayudar a mejorar de la composición corporal, especialmente cuando se asocian a ejercicios. Objetivo: Evaluar el efecto de dietas con contenido proteico vegetal y animal sobre la composición corporal de ratas Wistar sometidas al ejercicio resistido en escalera. Métodos: Cuarenta ratas machos recién destetadas se sometieron a un periodo de adaptación con dieta comercial (4 semanas) y entrenamiento de resistencia durante ocho semanas (tres veces por semana), recibiendo dietas con harina de bacuri y proteína del suero de la leche. Se distribuyeron aleatoriamente en 6 grupos: G1 (bacuri sedentario), G2 (bacuri ejercitado), G3 (WP sedentario), G4 (WP ejercitado), G5 (control sedentario) y G6 (control ejercitado). Se evaluó consumo de la dieta, peso corporal, longitud, circunferencias torácica y abdominal para calcular el índice de Lee y el índice de masa corporal; los sitios con grasa se retiraron después de la eutanasia. El análisis estadístico se realizó por ANOVA y prueba de Tukey, considerando el 5% de significación. Resultados: El peso final del G3 (372 ± 8,86 g) fue superior al del G2 (326,83 ± 15,03 g) y del G6 (316,75 ± 5,90 g); los grupos que recibieron dieta con harina de bacuri consumieron una cantidad mayor de alimentos, sin embargo, tuvieron menor peso final; no difirieron en el índice de Lee y en el IMC, sitios con grasa y índice de adiposidad con relación a los grupos tratados con WP, presentando valores inferiores en las circunferencias torácica y abdominal. Con respecto a las grasas e índice de adiposidad, no hubo diferencia entre los grupos sedentarios y ejercitados. Conclusión: a proteína de la almendra del bacuri se mostró de buena calidad en comparación con la proteína del suero de la leche, y existe la posibilidad de recomendar su uso en la preparación de suplementos nutricionales, como fuente de proteína vegetal alternativa e de bajo costo.

Resistance training minimizes the biomechanical effects of aging in three different rat tendons.

Aging process is characterized by a decline in the organism functionality, especially in the decrease of muscle function, which also affects tendons. On the other hand, the resistance training (RT) has been used as an important tool to increase muscle and tendineous function during aging. Thus, this study aim has been to verify the effects of RT on the biomechanical properties of three different aged rat tendons. For this purpose, 20 wistar rats have been divided into four groups (5 rats per group): young sedentary (YS), trained (YT), old sedentary (OS) and old trained (OT). The RT has been performed through climb protocol for 12 weeks. After RT, the calcaneal tendon (CT), superficial flexor tendon (SFT) and deep flexor tendon (DFT) have been used for analysis. The results indicate that the RT in aged rats can prevent tendon function decrease (p<0.05). Although RT has prompted significant biomechanical changes in trained aged rats, there has been no increase in cross-section area or tendon stiffness reduction. Thus, the OT group showed better biomechanical responses when compared with OS (p<0.05). Therefore, RT can be used as an excellent strategy for increasing in tendon capacity during aging.

Extreme Conditioning Program Induced Acute Hypotensive Effects are Independent of the Exercise Session Intensity.

The aim of the study was to determine the acute systolic (SBP) and diastolic (DBP) blood pressure, rating of perceived exertion (RPE) and heart rate (HR) responses following two intense training sessions (24 hours apart). Nine male extreme conditioning program (ECP) practitioners with more than 6 months of experience (age 26.7 ± 6.6 years; body mass 78.8 ± 13.2 kg; body fat 13.5 ± 6.2 %) completed two experimental ECP sessions. Cardiovascular variables were measured before, immediately after and every 15 min during a 45 min recovery following each experimental session. Compared with pre-exercise data, our results showed a SBP decrease at 30 min post exercise session 1 (P≤0.05) and at 45 min following exercise session 2. DBP decreased (P≤0.05) at 15 min and 30 min following exercise session 1 and at 30 min after the exercise session 2, respectively. HR remained significantly higher (P≤0.05) 45 min following the first and second exercise session compared with pre-exercise values. Exercise session 1 induced a higher increase in HR (86 ± 11% of HRmax versus 82 ± 12% of HRmax, p = 0.01) and RPE (8.8 ± 1.2 versus 8.0 ± 1.2, p = 0.02) when compared to exercise session 2. In conclusion, post-exercise hypotension occurs following strenuous exercise sessions, regardless of the session design, which may have an important role in the prevention of cardiovascular diseases.