Effects of Traditional and Vascular Restricted Strength Training Program With Equalized Volume on Isometric and Dynamic Strength, Muscle Thickness, Electromyographic Activity, and Endothelial Function Adaptations in Young Adults.

Ramis, TR, Muller, CHdL, Boeno, FP, Teixeira, BC, Rech, A, Pompermayer, MG, Medeiros, NdS, Oliveira, ÁRd, Pinto, RS, and Ribeiro, JL. Effects of traditional and vascular restricted strength training program with equalized volume on isometric and dynamic strength, muscle thickness, electromyographic activity, and endothelial function adaptations in young adults. J Strength Cond Res 34(3): 689-698, 2020-The purpose of the study was to evaluate and compare the acute and chronic effects of partial vascular occlusion training in young, physically active adults. Neuromuscular, morphological, and endothelial function responses were compared between high-intensity resistance training (HI-RT) and low-intensity resistance training with partial vascular occlusion (LI-BFR), despite the same training volume. The 28 subjects (age, 23.96 ± 2.67 years) were randomly assigned into 2 groups: LI-BFR (n = 15) and HI-RT (n = 13). Both groups performed unilateral exercise of elbow flexion (EF) and knee extension (KE) 3 times per week for 8 weeks. This study was approved by the ethics committee. Flow-mediated dilation showed a significant difference in baseline and post-training in the LI-BFR group (4.44 ± 0.51 vs. 6.35 ± 2.08 mm, respectively). For nitrite/nitrate concentrations only, there was a significant difference when comparing pre- and post-acute exercise in both groups. The torque and rep. Sixty percent 1 repetition maximum had improvements in both groups. There were differences between groups only in isometric delta EF and isokinetic delta KE (EF 3.42 ± 5.09 and 9.61 ± 7.52 N·m; KE 12.78 ± 25.61 and 42.69 ± 35.68 N·m; LI-BFR and HI-RT groups, respectively). There was a significant increase of muscle thickness in both groups. An increase of both isokinetic and isometric electromyography (EMG) of biceps of the HI-RT group was observed. The same was observed for the LI-BFR group regarding isokinetic and isometric EMG of vastus lateralis. Thus, in addition to strength and hypertrophy gains, this study also shows benefits related to vascular function. For practical applications, this study demonstrates a clinical importance of LI-BFR training as an alternative methodology.

Neuromuscular fatigue is weakly associated with perception of fatigue and function in patients with rheumatoid arthritis.

To assess electromyographic parameters of neuromuscular fatigue in knee extensors and their association with clinical, functional and emotional features in patients with rheumatoid arthritis (RA). Thirty-eight female patients with RA participated. Electromyography parameters (changes in signal amplitude, represented by the root mean square, and frequency content, represented by median frequency-MDF) were assessed during a submaximal (60%) isometric contraction of the knee extensors, sustained for 60 s. Clinical characteristics; the 28-joint Disease Activity Score (DAS-28) in which includes count of swollen joints (out of the 28) and tender joints (out of the 28), the erythrocyte sedimentation rate and global disease activity measured on a visual analogue scale; serum C reactive protein (CRP); information on treatment; the Health Assessment Questionnaire; the Functional Assessment of Chronic Illness Therapy fatigue scale (FACIT-F); the Short Form Health Survey (SF-36) and the International Physical Activity Questionnaire (IPAQ), were also assessed. The mean patient age was 51.0 ± 8.2 years, mean disease activity score was 11.5 ± 7.1, and mean CRP level was 8.0 ± 7.8 mg/dL. There was a moderate correlation between MDF and age (r = 0.5), as well as weak correlations of MDF with FACIT-F (r = 0.3), physical functioning (r = - 0.3) and vitality domains (r = - 0.3) of the SF-36, and IPAQ (r = - 0.3) (p ≤ 0.05 for all). No association was observed between electromyography measurements and clinical or treatment features. The electromyographic parameter MDF was correlated with perception of fatigue, age, physical functioning and vitality domains of SF-36, and physical activity level in this sample. These results indicate that primary muscle factors should also be considered when managing perceived fatigue in patients with RA.

Rehydration during exercise in the heat reduces the physiological strain index in healthy adults / Reidratação durante exercício no calor reduz o índice de esforço fisiológico em adultos saudáveis / Reidratação durante exercício no calor reduz o índice de esforço fisiológico em adultos saudáveis

Exercise in the heat leads to physiological alterations that reflect mainly on the cardiovascular system. The physiological strain index (PSI) uses heart rate (HR) and rectal temperature (Tre) to evaluate the cardiovascular strain and it has been recommended in literature. However, few studies have used PSI to evaluate its response following dehydration and rehydration protocols. Thus, the aim of the present study was to verify the effect of rehydration proportional to fluid losses during prolonged exercise in the heat on hydration status, PSI and rating of perceived exertion (RPE) in healthy subjects. Ten volunteers performed two exercise sessions in the heat. The first with fluid restriction until subjects reached 2% body mass (BM) reduction. The second exercise session had rehydration proportional to fluid losses of the first. HR and Tre were monitored during the entire exercise protocol in order to calculate PSI. Subjects also reported their RPE. BM, urine specific gravity (USG) and urine color (UC) were measured to evaluate hydration status. Results demonstrated greater PSI in the fluid restriction trial compared to the rehydration trial from 45 minutes of exercise (p<0.05), and that differences remain significant until the end of the protocol. RPE also presented significant differences between trials (p<0,001). Rehydration strategy was effective to maintain hydration status and attenuate the increase in PSI and RPE, which has important implications for physical exercises, especially those lasting over 45 minutes. .

O exercício no calor provoca alterações fisiológicas que refletem principalmente no sistema cardiovascular. O índice de esforço fisiológico (IEF), que utiliza o comportamento da temperatura corporal (Tre) e da frequência cardíaca (FC) para avaliar o nível de sobrecarga cardiovascular vem sendo preconizado na literatura. Porém, poucos estudos avaliaram os efeitos da desidratação e reidratação sobre este marcador. Assim, o objetivo foi verificar o efeito de uma estratégia de reidratação proporcional à perda hídrica durante exercício prolongado no calor sobre o estado de hidratação, IEF e taxa de percepção de esforço (TPE) de sujeitos saudáveis. Dez sujeitos realizaram duas sessões de exercício no calor, sendo a primeira sem reidratação (redução de 2% da massa corporal) (MC) e a segunda com reidratação (água mineral) em um volume proporcional à perda da primeira sessão. A FC e a Tre foram monitoradas durante o exercício para o cálculo do IEF. A TPE também foi obtida durante o exercício. A MC, gravidade específica (GEU) e coloração da urina (COR) foram mensuradas antes e após o exercício para avaliação do estado de hidratação. Os resultados demonstraram maior IEF na situação sem reidratação comparada à situação com reidratação a partir de 45 minutos de exercício (p<0,05), mantendo-se significativa até o final do protocolo. A TPE também apresentou diferença significativa entre as situações (p<0,001). A estratégia de reidratação foi efetiva para manter o estado de hidratação, atenuar o IEF e a TPE, trazendo importantes implicações para práticas desportivas, sobretudo àquelas que têm duração superior a 45 minutos.

Relação entre capacidades motoras de idosas praticantes de hidroginástica e alongamento / Relationship between motor performance in elderly practiced hydrogymnastics and stretching

O objetivo do estudo foi verificar se há relação entre capacidadesmotoras de idosas submetidas a um programa físico compostopor dois tipos de atividade física (hidroginástica e alongamento). Aamostra foi composta por 23 indivíduos saudáveis e ativos do sexofeminino, com idades entre 60 e 80 anos. Os sujeitos foram divididosem dois grupos etários (GR1 = 60 a 69 anos, GR2 = 70 a80). Os instrumentos foram testes físicos da bateria ‘Senior FitnessTest’ de Rikli e Jones (2008). As capacidades motoras avaliadasforam: flexibilidade de membros inferiores (FLEXMI); força de membrosinferiores (FMI); flexibilidade de membros superiores (FLEXMS);força de membros superiores (FMS); agilidade/equilíbrio (AE); e resistênciaaeróbica (RESAER). O tratamento estatístico foi realizadoatravés da correlação de Pearson do programa SPSS 18.0. Foramencontradas, no GR1, correlações entre: FMI e FLEXMI, FMI e AE,FMI e RESAER, FLEXMI e RESAER, AE e RESAER. No GR2, a únicacorrelação encontrada foi entre AE e RESAER. Os componentes daaptidão física, nos idosos mais jovens, apresentaram, neste estudo,maior número de correlações, indicando que incrementos em umacapacidade motora podem gerar melhoras noutra. Estudos comdiferentes atividades físicas são necessários para confirmar essasrelações.

The aim of the study was to verify if there is association between themotor capacities of older women undergoing a physical programcomposed of two types of activities (hydrogymnastics and stretching).The sample consisted of 23 healthy and active female, agedbetween 60 and 80 years. The subjects were divided into two agegroups (GR1 = 60 to 69 years, GR2 = 70 to 80). The instrument wasthe ‘Senior Fitness Test’ of Rikli and Jones (2008). Motor capacitiesevaluated were: lower limbs flexibility (FLEXMI), lower limbs strength(FMI), upper limbs flexibility (FLEXMS), upper limbs strength (FMS), agility / balance (AE) and aerobic resistance (RESAER). Statisticalanalysis was performed using the Pearson’s Correlation of SPSS18.0. In GR1, the correlations were found between: FMI e FLEXMI,FMI e AE, FMI e RESAER, FLEXMI e RESAER, AE e RESAER. InGR2, the only correlation was found between AE and RESAER. Thecomponents of physical aptitude, in younger elderly, presented, inthis study, a higher number of correlations, indicating that increasesin a component can lead to improvements in another. Studies withdifferent types of activities are needed to confirm these relationships.

Relação entre capacidades motoras de idosas praticantes de hidroginástica e alongamento / Relationship between motor performance in elderly practiced hydrogymnastics and stretching

O objetivo do estudo foi verificar se há relação entre capacidadesmotoras de idosas submetidas a um programa físico compostopor dois tipos de atividade física (hidroginástica e alongamento). Aamostra foi composta por 23 indivíduos saudáveis e ativos do sexofeminino, com idades entre 60 e 80 anos. Os sujeitos foram divididosem dois grupos etários (GR1 = 60 a 69 anos, GR2 = 70 a80). Os instrumentos foram testes físicos da bateria ‘Senior FitnessTest’ de Rikli e Jones (2008). As capacidades motoras avaliadasforam: flexibilidade de membros inferiores (FLEXMI); força de membrosinferiores (FMI); flexibilidade de membros superiores (FLEXMS);força de membros superiores (FMS); agilidade/equilíbrio (AE); e resistênciaaeróbica (RESAER). O tratamento estatístico foi realizadoatravés da correlação de Pearson do programa SPSS 18.0. Foramencontradas, no GR1, correlações entre: FMI e FLEXMI, FMI e AE,FMI e RESAER, FLEXMI e RESAER, AE e RESAER. No GR2, a únicacorrelação encontrada foi entre AE e RESAER. Os componentes daaptidão física, nos idosos mais jovens, apresentaram, neste estudo,maior número de correlações, indicando que incrementos em umacapacidade motora podem gerar melhoras noutra. Estudos comdiferentes atividades físicas são necessários para confirmar essasrelações.(AU)

The aim of the study was to verify if there is association between themotor capacities of older women undergoing a physical programcomposed of two types of activities (hydrogymnastics and stretching).The sample consisted of 23 healthy and active female, agedbetween 60 and 80 years. The subjects were divided into two agegroups (GR1 = 60 to 69 years, GR2 = 70 to 80). The instrument wasthe ‘Senior Fitness Test’ of Rikli and Jones (2008). Motor capacitiesevaluated were: lower limbs flexibility (FLEXMI), lower limbs strength(FMI), upper limbs flexibility (FLEXMS), upper limbs strength (FMS), agility / balance (AE) and aerobic resistance (RESAER). Statisticalanalysis was performed using the Pearson’s Correlation of SPSS18.0. In GR1, the correlations were found between: FMI e FLEXMI,FMI e AE, FMI e RESAER, FLEXMI e RESAER, AE e RESAER. InGR2, the only correlation was found between AE and RESAER. Thecomponents of physical aptitude, in younger elderly, presented, inthis study, a higher number of correlations, indicating that increasesin a component can lead to improvements in another. Studies withdifferent types of activities are needed to confirm these relationships.(AU)