Effects of Resistance Training in Individuals with Lower Limb Amputation: A Systematic Review.

Individuals with lower-limb amputations may have a significant strength deficit. This deficit may be related to the stump length and can lead to changes in gait, reduced energy efficiency, walking resistance, altered joint load, and increased risk of osteoarthritis and chronic low back pain. This systematic review used the Preferred Reporting Items for Systematic Reviews and Meta-Analyzes (PRISMA) guidelines to examine the effects of resistance training in lower limb amputees. Interventions with resistance training and other training methods were sufficient to achieve muscle strength gain in muscles of the lower limbs, improved balance, and improvements in gait pattern and speed when walking. However, it was impossible to determine from the results whether resistance training was mainly responsible for these benefits or even whether the positive effects presented would be observed with only this training method. When combined with other exercises, interventions with resistance training made possible gains for this population. Accordingly, it is noteworthy that the main finding of this systematic review is that the effects may be different according to the level of amputation, with mainly transtibial and transfemoral amputations studied.

Influence of Resistance Training Exercise Order on Acute Thyroid Hormone Responses.

The present study aimed to compare the exercise order of an acute bout of resistance exercise (RT) on acute thyroid hormonal responses. Eight (n = 8) healthy men were randomly separated into two experimental groups: A) the order from multi- to single-joint exercises (MJ-SJ) and B) the order from single- to multijoint exercises (SJ-MJ). For all exercises in both orders, the subjects were submitted to 3 sets of 10 repetitions, with rest intervals of 2 minutes between sets and 3 minutes between exercises. Blood samples were collected at rest and 0, 15, 30, 60 and 120 min after the end of the exercise session. In thyroidstimulating hormone (TSH), differences between groups (MJ-SJ < SJ-MJ) were observed within 15 minutes after the session. In 3,5,3'-triiodothyronine (T3), differences between groups were observed between 30 (MJ-SJ > SJ-MJ) and 120 minutes (MJ-SJ < SJ-MJ) after the session. In 3,5,3',5'-tetraiodothyronine (T4), differences between groups (MJ-SJ > SJ-MJ) were observed within 15 minutes after the RT session. The order of RT exercises significantly changes the hormonal responses of TSH, T3 and T4. In addition, the exercise order should be chosen according to the individual's objectives.

Association between handgrip strength and body composition, physical fitness, and biomarkers in postmenopausal women with metabolic syndrome.

OBJECTIVES: This study examined the association between handgrip strength and body composition, physical fitness, and biomarkers in postmenopausal women with metabolic syndrome. METHODS: A total of 75 postmenopausal women were diagnosed with metabolic syndrome participated in this study. Muscle strength was assessed via a hydraulic grip strength dynamometer; physical fitness tests included a timed-up-and-go, arm curl test, and 30-s chair stand. Body composition was assessed via bioelectrical impedance, from which estimates of fat mass, body fat percentage, fat-free mass, and visceral fat area were determined. Fasting plasma glucose and glycated hemoglobin were measured via blood sample analyses. Multiple linear regression analyses were conducted using handgrip strength as the dependent variable and using body composition, physical fitness, and biomarkers as independent variables. RESULTS: The results revealed that 52% of the total sample were classified as obese, 37.3% as overweight, and only 10.7% as normal weight. Significant correlations were present between handgrip strength and fat-free mass (p=0.002; R=0.590), mean blood pressure (p=0.002; R=0.450), and arm curl (p=0.001; R=0.795). CONCLUSION: This study showed that handgrip strength was predictive of fat-free mass, blood pressure, and upper limb strength performance.

Association between handgrip strength and body composition, physical fitness, and biomarkers in postmenopausal women with metabolic syndrome

SUMMARY OBJECTIVES: This study examined the association between handgrip strength and body composition, physical fitness, and biomarkers in postmenopausal women with metabolic syndrome. METHODS: A total of 75 postmenopausal women were diagnosed with metabolic syndrome participated in this study. Muscle strength was assessed via a hydraulic grip strength dynamometer; physical fitness tests included a timed-up-and-go, arm curl test, and 30-s chair stand. Body composition was assessed via bioelectrical impedance, from which estimates of fat mass, body fat percentage, fat-free mass, and visceral fat area were determined. Fasting plasma glucose and glycated hemoglobin were measured via blood sample analyses. Multiple linear regression analyses were conducted using handgrip strength as the dependent variable and using body composition, physical fitness, and biomarkers as independent variables. RESULTS: The results revealed that 52% of the total sample were classified as obese, 37.3% as overweight, and only 10.7% as normal weight. Significant correlations were present between handgrip strength and fat-free mass (p=0.002; R=0.590), mean blood pressure (p=0.002; R=0.450), and arm curl (p=0.001; R=0.795). CONCLUSION: This study showed that handgrip strength was predictive of fat-free mass, blood pressure, and upper limb strength performance.

Entrenamiento de restricción del flujo de sangre en sujetos hipertensivos: revisión sistemática / Blood flow restriction training on hypertesive subjects: a systematic review

Introduction: Systemic arterial hypertension has been growing worldwide, causing thousands of deaths and large expenses in this condition treatment. Currently, resistance training (RT) is widely prescribed as a non-pharmacological option for blood pressure control, but there are some individuals with intolerance to high load of RT. Hence, blood flow restriction is a method created to stimulate high level of physiological adaptations with low resistive load. However, there are uncertainties about safety and efficacy of this method. Objective: The present study aimed to investigate the safety and efficacy of blood flow restriction training in hypertensive individuals. Material and method: The research was carried out through a systematic review within the criteria established by the PRISMA statement. Only studies about blood flow restriction in subjects with arterial hypertension were selected in the following databases: MEDLINE/PUBMED, Web of Science, SCOPUS and SPORTDiscus. Results: Five studies (4 acute and 1 chronic effects ) met the requirements for the present review, with 77 hypertensive individuals. Only one study presented levels of blood pressure above to the recommended for hypertensive subjects. Conclusion: Even though the number of studies is still insufficient to conclude about the efficacy, the results allow concluding that resistance training with blood flow restriction is a safe alternative of exercise method to hypertensive subjects, especially for those with intolerance to high training loads.(AU)

Introducción: La hipertensión arterial sistémica ha ido creciendo a nivel mundial, provocando miles de muertes y grandes gastos en el tratamiento de esta afección. Actualmente, el entrenamiento de fuerza se prescribe ampliamente como una opción no farmacológica para el control de la presión arterial, pero hay algunas personas con intolerancia al entrenamiento de alta intensidad. Por ello, el entrenamiento de restricción del flujo sanguíneo es un método creado para estimular los altos niveles de adaptación fisiológica con cargas de baja intensidad. Sin embargo, existen incertidumbres sobre la seguridad y eficacia de este método y no hay consenso al respecto. Objetivo: El presente estudio tuvo como objetivo investigar la seguridad y eficacia del entrenamiento de restricción del flujo sanguíneo en individuos hipertensos. Material y método: La investigación se realizó mediante una revisión sistemática, dentro de los criterios establecidos por la declaración PRISMA y se utilizaron las siguientes bases de datos: MEDLINE/PUBMED, Web of Science, SCOPUS y SPORTDiscus, incluyendo solo estudios con individuos con hipertensión arterial en los que se utilizó el método. Resultados: Cinco estudios (4 efectos agudos y 1 efectos crónicos) cumplieron con los requisitos de la presente revisión, con 77 individuos hipertensos. 4 estudios evaluaron efectos agudos y 1 estudio evaluó efectos crónicos. Solo un estudio incluido presenta niveles aumentados de presión arterial por encima de los niveles recomendados en sujetos hipertensos y los otros 4 estudios demostraron la seguridad del entrenamiento de oclusión. Conclusión: A pesar de que el número de estudios aún es insuficiente para concluir sobre su eficacia, los resultados muestran una seguridad de este método como ejercicio alternativo para sujetos hipertensos, especialmente aquellos con intolerancia al entrenamiento de cargas de alta intensidad.(AU)

Effects of 12 Months of Vitamin D Supplementation on Physical Fitness Levels in Postmenopausal Women with Type 2 Diabetes.

INTRODUCTION: It is common for postmenopausal women to receive a vitamin D supplementation prescription to assist in preventing future falls and to maintain bone health. However, the association between vitamin D supplementation and physical fitness components has not been studied in older women with diabetes. OBJECTIVE: We examined the influence of 12 months of vitamin D supplementation on the components of physical fitness in postmenopausal women with type 2 diabetes mellitus (T2DM). METHODS: Thirty-five postmenopausal women (62.48 ± 7.67 years; 154.6 ± 5.11 cm; 73.93 ± 15.43 kg; 31.13 ± 5.82 BMI) with a diagnosis of T2DM participated in this longitudinal study where participants were supplemented with 1000 IU/day of vitamin D over 12 months. Subjects performed fasting blood samples, anthropometric assessments, body composition, clinical exams, and physical tests at 6-month intervals (P0, P6, and P12). RESULTS AND CONCLUSION: Vitamin D supplementation alone was effective in postmenopausal women in increasing serum vitamin D levels, altering muscle strength levels, promoting improvements in muscle function, as well as preventing and controlling fragility caused by T2DM and aging.

The effect of short-term resistance training on hand reaction time improvement is independent of sexual dimorphism / El efecto del entrenamiento de resistencia a corto plazo en la mejora del tiempo de reacción manual es independiente del dimorfismo sexual / O efeito do treinamento resistido de curto prazo sobre a melhora do tempo de reação é independente do dimorfismo sexual

Objectiveː The aim was to evaluate the effects of four weeks of resistance training and sexual dimorphism on Manual reaction time in apparently healthy subjects.Methods: The subjects of the sample were randomly allocated in two groups, as follow: Control (CTRL) - kept 4 weeks without any systematized physical activity (Nmales= 8, age= 24±3 yrs., body weight= 76.9±15.4 kg; Nfemales= 8, age= 22.5±4 yrs., body weight= 70.8±17.5 kg); Experimental (EXP) - 4 weeks of resistance training (Nmales= 8, age= 23±3 yrs., weight= 69.6±11 kg; Nfemales= 8, age= 22.5±1 yrs., body weight= 59.77±6.8 kg). The resistance training consisted of 4 exercises for upper limbs (3 sets x 8-12 reps) and 4 exercises for lower (3 sets x 12-15 reps). Manual reaction time was evaluated in a manufactured Arduino-based reaction time device connected to a computer.Results: For men, there was a significant decrease in Manual reaction time after resistance training within EXP (p<0.0001) and between groups (p<0.0001). Women showed the same results within EXP (p<0.0001) and between groups (p<0.0001). Additionally, there was no sexual dimorphism before or after four weeks of resistance training.Conclusion: The results suggest that just four weeks of resistance training was sufficient to improve Manual reaction time, regardless of sexual dimorphism. Therefore, resistance training inclusion in the training periodization seems essential to improve or rehabilitate the fast voluntary motor response, especially for activities or sports that require it. (AU)

Objetivo: El objetivo fue evaluar los efectos de cuatro semanas de entrenamiento de resistencia y dimorfismo sexual sobre el tiempo de reacción manual en jóvenes aparentemente sanos.Métodos: Los sujetos de la muestra fueron asignados aleatoriamente en dos grupos, como sigue: Control (CTRL) - mantenido 4 semanas sin ninguna actividad física sistematizada (Nhombres= 8, edad= 24 ± 3 años, peso corporal= 76.9 ± 15.4 kg; Nmujeres= 8, edad= 22.5 ± 4 años, peso corporal= 70.8 ± 17.5 kg); Experimental (EXP) - 4 semanas de entrenamiento de resistencia (Nhombres= 8, edad= 23 ± 3 años, peso corporal= 69.6 ± 11 kg; Nmujeres= 8, edad= 22.5 ± 1 año, peso corporal= 59.77 ± 6.8 kg). El entrenamiento de resistencia consistió en 4 ejercicios para las extremidades superiores (3 series x 8-12 repeticiones) y 4 ejercicios para las inferiores (3 series x 12-15 repeticiones). El tiempo de reacción manual se evaluó utilizando una placa Arduino fabricada conectada a la computadora.Resultados: Para los hombres, hubo una reducción significativa en tiempo de reacción manual después de entrenamiento de resistencia intra EXP (p <0.0001) y entre grupos (p <0.0001). Los mismos resultados se observaron en mujeres, intra EXP (p <0.0001) y entre grupos (p <0.0001). Además, no hubo dimorfismo sexual antes y después de 4 semanas de entrenamiento de resistencia.Conclusión: Los resultados sugieren que solo cuatro semanas de entrenamiento de resistencia fueron suficientes para mejorar la tiempo de reacción manual, independientemente del dimorfismo sexual. La inclusión del entrenamiento de resistencia en la periodización del entrenamiento parece importante para mejorar o rehabilitar la respuesta motora voluntaria rápida, especialmente para actividades o deportes que lo requieran. (AU)

Objetivo: O objetivo foi avaliar os efeitos de quatro semanas de treinamento resistido e do dimorfismo sexual sobre o tempo de reação manual em jovens aparentemente saudáveis.Metodos: 32 jovens destreinados de ambos os sexos compuseram a amostra. Eles foram aleatoriamente alocados em 2 grupos: Controle (CTRL) – ficaram 4 semanas sem exercícios físicos (Nhomens= 8, idade= 24±3 anos, peso corporal= 76.9±15.4 kg; Nmulheres= 8, idade= 22.5±4 anos, peso corporal= 70.8±17.5 kg); Experimental (EXP) - 4 semanas de treinamento resistido (Nhomens= 8, idade= 23±3 anos, peso corporal= 69.6±11 kg; Nmulheres= 8, idade= 22.5±1 anos, peso corporal= 59.77±6.8 kg). O treinamento resistido consistiu em 4 exercícios para membros superiores (3 séries x 8-12 reps) e 4 para inferiores (3 sets x 12-15 reps). tempo de reação manual foi avaliado através de uma placa manufaturada de Arduino conectada ao computador.Resultados: Para os homens, houve uma redução significativa no tempo de reação manual após treinamento resistido intra EXP (p<0.0001) e entre os grupos (p<0.0001). Os mesmos resultados foram observados em mulheres, intra EXP (p<0.0001) e entre os grupos (p<0.0001). Adicionalmente não houve dimorfismo sexual antes ou após 4 semanas de treinamento resistido.Conclusão: Os resultados sugerem que apenas quatro semanas de treinamento resistido foram suficientes para melhorar o tempo de reação manual, independente do dimorfismo sexual. Portanto, a inclusão do treinamento resistido na periodização de treinamento parece importante para melhorar ou reabilitar a resposta motora voluntária rápida, principalmente para atividades ou esportes que assim necessitem. (AU)

Reliability of bioimpedance and indirect calorimetry to evaluate resting metabolic rate in Brazilian women with metabolic syndrome.

BACKGROUND AND AIMS: Precise evaluation of resting metabolic rate (RMR) is critical, especially for seniors in syndromes conditions. The study aimed to compare different methods and devices to evaluate the resting metabolic rate and assess them' reliability in Brazilian women with metabolic syndrome. METHODS: A single-center prospective study with forty elderly postmenopausal women was performed to verify the reliability of indirect calorimetry (IC) versus Bioimpedance (BIA) on RMR fluctuations for an interval length of six months. RESULTS: Measurements showed a high correlation between devices at baseline [BIA vs IC, intraclass correlation coefficient (ICC) = 0.906 (0.822-0.950)]. Surprisingly, a high correlation was kept between BIA and IC after six months [BIA vs. IC, ICC = 0.909 (0.829-0.952)]. The results suggest that both BIA and IC are excellent strategies to measure RMR in elderly postmenopausal women and with metabolic syndrome. CONCLUSIONS: However, the BIA method presents greater convenience, optimizes patients' time, and does not require prolonged fasting to obtain good reliable results compared to IC.

Association between vitamin D status and glycemic profile in postmenopausal women with type 2 diabetes.

The aim of this study is to evaluate the association between vitamin D status and glycemic profile in postmenopausal women with type 2 diabetes. A cross-sectional study was carried out with 70 (59.47 ±â€¯6.47 years; 1.56 ±â€¯0.05 m; 73.56 ±â€¯13.01 kg; 30.30 ±â€¯5.00 BMI kg/m2) postmenopausal women with type 2 diabetes (T2D). The blood samples were collected after fasting for 12 h and the main outcome parameters were serum follicle-stimulating hormone (FSH), estradiol; 25-OH vitamin D; insulin; C-Reactive Protein; cholesterol total (CT), triglycerides (TG), high density lipoprotein (HDL-cholesterol), glucose; calcium, HDL-cholesterol. The average serum 25(OH)D level in this study was 28.45 ±â€¯8.26 ng/mL. The prevalence of hypovitaminosis D was 60%. Table 1 displays mean and standard deviation values for participants' characteristics. The postmenopause status of the women studied was confirmed by FSH and estradiol measurement. All the clinical and anthropometric characteristics did not show difference (p > 0.05) between the groups (Table 2). Triglycerides level was highest (p < 0.0391) in the hypovitaminosis D group. The other serum markers did not show statistical differences (p > 0.05) between the groups. In conclusion, our results suggest that only TG level shows a negative correlation with vitamin D status in postmenopausal women with type 2 diabetes.

Can Vitamin D supplementation alone effective to increase a physical fitness levels in post-menopausal women with metabolic disorders? Brief Review.

BACKGROUND: During the climacteric period, occur an aging process of the skin, and promote several decreases in the ability of vitamin D synthesis in an organism and lower levels of Vitamin D may contribute to the appearance of conditions such as osteomalacia, osteoporosis, falls and fractures. AIM: The present brief review focuses on the influence of Vitamin D supplementation alone on physical fitness (strength, endurance, and balance) in postmenopausal with diseases or not. METHODS: Search in Medline and PubMed relevant articles with Vitamin D supplementation alone on physical fitness (strength, endurance, and balance) in postmenopausal with diseases or not, were included only 5 clinical. CONCLUSIONS: In conclusion, the effectiveness depends on the amount was prescribed for supplementation and the patient's characteristics. Doses less than 1000 IU/d did not show significant changes in physical fitness on post-menopausal women with metabolic diseases or not.

Acute Effects of Proprioceptive Neuromuscular Facilitation on Peak Torque and Muscle Imbalance.

BACKGROUND: The effects of proprioceptive neuromuscular facilitation (PNF) stretching on muscle imbalance are not fully understood. The aim of this study was to examine the acute effects of PNF stretching on knee extension and flexion peak torque (PT), as well as the conventional and functional hamstrings to quadriceps (H:Q) ratios. METHODS: Fifteen men (age = 22 ± 1 years; body mass = 76 ± 12 kg; height = 176 ± 7 cm) and fifteen women (age = 22 ± 2 years; body mass = 63 ± 8 kg; height = 161 ± 5 cm) performed concentric quadriceps and hamstrings, and eccentric hamstrings muscle actions at different angular velocities (60, 180, and 300°·s-1 concentric; 60 and 180°·s-1 eccentric) before and after a bout of PNF stretching, and a control condition. RESULTS: Neither PNF or control conditions affected concentric PT or H:Q ratios (p > 0.05), apart from knee extension at 60°·s-1 in men (p = 0.001). However, there was a reduction in hamstrings eccentric PT in both control and PNF conditions for men and women (p = 0.003). CONCLUSIONS: PNF stretching of the hamstrings may not adversely affect the H:Q ratios, and consequently not negatively affect injury risk associated with muscular strength imbalances.

Efeito da suplementação de vitamina D nos marcadores da aptidão física relacionados à saúde e qualidade de vida em mulheres diabéticas tipo 2 na pós-menopausa / Effect of vitamin D supplementation on health-related physical fitness markers and quality of life in postmenopausal type 2 diabetic women

A suplementação de Vitamina D vem sendo estudada como uma das formas de tratamento e prevenção de diversas doenças relacionadas ao envelhecimento da mulher. Alguns estudos já demonstram sua influência na melhoria do desempenho físico. O estudo teve como objetivo verificar a influência da suplementação de Vitamina D na aptidão física de mulheres com diabetes tipo 2 no pós-menopausa. O estudo foi dividido em três etapas: 1) um estudo de revisão integrativa sobre a suplementação de Vitamina D isolada na manutenção e melhora da aptidão física; 2) um estudo transversal com os dados do início da coleta de dados; 3) um estudo longitudinal com os dados dos 12 meses de coleta de dados. No estudo de revisão apenas 5 estudos atenderam aos critérios de inclusão da revisão integrativa, sendo que no estudo experimental, foram recrutadas 110 participantes e apenas 40 atenderam e aceitaram participar da coleta de dados. Os resultados do artigo de revisão demonstraram que apenas as dosagens de vitamina D acima de 1000 UI/dia foram efetivas para a aptidão física. Contudo, no estudo transversal, os resultados demonstraram que houve relação entre a massa muscular e a força muscular das mãos e, além disso, existe uma associação inversa entre a glicemia de jejum e a força muscular. No estudo longitudinal, a suplementação de Vitamina D (1000ui/d) foi efetiva no aumento de força muscular e consequentemente na função muscular, além da manutenção da massa magra durante o período de seguimento. Portanto, conclui-se que a suplementação de Vitamina D pode ser uma importante estratégia de prevenção e tratamento no grupo experimental estudado.

Association between muscle function and body composition, vitamin D status, and blood glucose in postmenopausal women with type 2 diabetes.

AIMS: The aim of this study was to examine the association between muscle function, and body composition, vitamin D status, and blood glucose in post-menopausal women with type 2 diabetes (T2D). METHODS: Forty post-menopausal women (62.48±7.67years; 154.6±5.11cm; 73.93±15.43kg; 31.13±5.82 BMI kg/m2) with a diagnosis of T2D participated in this cross-sectional study. The patients performed fasting blood sample exams, anthropometrics assessments, body composition, and clinical exams. Subjects performed physical tests including handgrip, timed up and go, 30-s chair stand, arm curl, and sit-to-stand. The correlation between the parameters of physical tests, age, body composition, vitamin D, and blood glucose was assessed by Pearson correlation. RESULTS: The results showed there were significant correlations between blood glucose and relative strength (R=-0.398, p=0.011), arm curl test (R=-0.367 and p=0.020), and hip flexion (R=0.427, p=0.006). CONCLUSIONS: These findings are important because they highlight the importance of resistance training in individuals with T2D and the relationship with a fat increase during a dicrease process. Furthermore, the concentration of serum glucose might be associated with decreases in muscle strength and muscle function in older adults. Thus, T2D patients should be involved with strength training to improve the strength and the muscle hypertrophy.

Hypotensive Responses of Reciprocal Supersets versus Traditional Resistance Training in Apparently Healthy Men.

The purpose of this study was to compare the hypotensive responses of reciprocal supersets (SS) versus traditional training (TRAD) methods. Thirteen men with at least five years of recreational experience in resistance training (RT) volunteered for the study. When completing the TRAD protocol, participants performed the following exercises separately in sequence: chest press (CP), low row (LR), leg extension (LE), leg curl (LC), pull down (PD), and shoulder press (SP). The SS method required participants to complete the same exercises as in the TRAD protocol, but exercises were coupled such that muscles sequentially served both as an agonist for lift one and then antagonist for lift two and vice versa. Exercise order used was CP and LR, LE and LC, and PD and SP with 10 repetition maximum loads. Blood pressure (BP) was measured before and for every 10 minutes for one hour after training. There was significantly more total work (TW) done in the TRAD condition compared to SS. Post exercise hypotension was evident only after the TRAD session at minutes 30 and 40 for systolic BP. Significant differences between the TRAD and SS methods were found at 20 minutes, 30 minutes, and 40 minutes for systolic BP. There was no significant two-way interaction for group × time for diastolic BP. There was a significant two-way interaction for group × time for mean arterial pressure. Significant reductions for mean arterial pressure (MAP) occurred only in the TRAD method after 30 to 40 minutes compared to the baseline values. Therefore, a TRAD RT method was sufficient to cause a hypotensive effect after the training session whereas the SS method did not reveal significant decreases in BP after the session. However, these findings are important to elucidate concerns regarding the post-exercise hypotension after RT and showed that TW might be the key to promote these changes because the volume of training was shown to be an important training variable to manipulate and might be associated with BP hypotension after RT.

Influencia de la intensidad de la carga en la presión arterial tras una sesión de entrenamiento de fuerza / Influence of load intensity on blood pressure after a resistance training session

Este estudio tuvo como objetivo comparar la respuesta de la presión arterial en los hombres normotensos entrenados realizando sesiones experimentales con cargas del 60 y el 80% de una repetición máxima. Diez participantes se sometieron a 3 condiciones experimentales: P60 (sesión realizada con el 60%); P80 (sesión realizada con el 80% de una repetición máxima [1RM]), y CONT (solo las evaluaciones de la presión arterial en el estado de reposo durante 60 min [intervalos de 10 min]). El protocolo experimental se llevó a cabo con 3 series, con intervalo de 3 min entre las series y los ejercicios. La presión arterial se midió antes y a los 10, 20, 30, 40, 50 y 60 min después de la sesión de entrenamiento. Los resultados mostraron que ambos protocolos indujeron hipotensión postejercicio (p < 0,05) en comparación con los valores en reposo. El P80 mostró una mayor magnitud y duración de la hipotensión postejercicio en comparación con el protocolo P60 (p < 0,05). En conclusión, el entrenamiento de fuerza es eficaz para proporcionar hipotensión postejercicio independientemente de la intensidad de la carga. Por lo tanto, en esta investigación es importante mostrar la relevancia del control de la intensidad de la carga durante el desarrollo de los programas de entrenamiento de fuerza. El entrenamiento de fuerza con el 60% de 1RM puede ser tan eficaz como los protocolos con 80% de 1RM para prevenir la presión arterial alta en los hombres

This study aimed to compare the blood pressure responses in normotensive-trained men following resistance training (RT) experimental sessions with loads of 60% and 80% of a one-repetition maximum. Ten participants underwent three experimental condition: (P60) - session adjusted with 60%, (P80) - session adjusted with 80% of 1 repetition maximum (1RM) and, (CONT) - conly blood pressure assessments in rest condition for 60 min (intervals of 10 min). The resistance training design was adjusted with 3-sets, 3-min rest interval length between sets and exercises. Blood pressure was measured before, and at 10, 20, 30, 40, 50, and 60 min after the training session. The results showed that both protocols induce post-exercise hypotension (p < 0.05) compared to the rest values. The P80 showed greater magnitude and duration of post exercise hypotension when compared with P60 protocol (p < 0.05). In conclusion, resistance training is effective to provide a post exercise hypotension independent of the load intensities. This study is important to show the importance of control of the load intensity during development of resistance training programs and, the RT with 60% of 1RM can be as effective as protocols with 80% of 1RM to prevent the high blood pressure

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.

Influence of Rest Interval Length Between Sets on Blood Pressure and Heart Rate Variability After a Strength Training Session Performed By Prehypertensive Men.

Figueiredo, T, Willardson, JM, Miranda, H, Bentes, CM, Machado Reis, V, Freitas de Salles, B, and Simão, R. Influence of rest interval length between sets on blood pressure and heart rate variability after a strength training session performed by prehypertensive men. J Strength Cond Res 30(7): 1813-1824, 2016-The purposes of this study were to compare the effects of 2 different rest interval lengths between sets and exercises during strength training (ST) on blood pressure (BP) and heart rate variability (HRV) in prehypertensive trained men, and to verify how HRV influences BP. Eleven volunteer subjects (age: 26.1 ± 3.6 years; body mass: 74.1 ± 7.9 kg; height: 172.1 ± 4.1 cm; % body fat: 18.3 ± 6.3; ST experience: 1.7 ± 0.8 years) participated in this study. After assessing one repetition maximum (1RM) loads for the free weight bench press, lat pull-down, shoulder press, biceps curl, triceps extension, leg press, leg extension, and leg curl exercises; subjects performed 2 sessions with different rest intervals between sets and exercises in random order and 72 hours apart. Each ST session consisted of performing 3 sets of eight to 10 repetitions at 70% of a 1RM for each exercise, with either 1-minute (sequence 1 [SEQ1]) or 2-minute (sequence 2 [SEQ2]) rest intervals between sets and exercises, respectively. Before and after each session, BP and HRV (low frequency band, high frequency [HF] band, and square root of the mean squared difference of successive RR-interval index) were tracked for 60 minutes. The results demonstrated a postexercise hypotensive response (PEH) after both rest interval conditions (p ≤ 0.05). Additionally, increases in cardiac stress were noted after SEQ1, with a greater withdrawal in parasympathetic activity vs. baseline as noted in the HF band at 1-, 10-, and 20-minute postexercise (p ≤ 0.05). These results indicate that both sequences provided an effective stimulus for a PEH. Therefore, strength and conditioning professionals may prescribe 1- or 2-minute rest between sets and exercises when the goal is to reduce BP after training sessions. However, resting 1 minute between sets and exercises was associated with greater cardiac stress, and so this may necessitate prescription of longer rest intervals between sets and exercises when working with individuals who have been diagnosed with cardiovascular dysfunction.

Acute effects of different stretching techniques on the number of repetitions in a single lower body resistance training session.

This study aimed to investigate the acute effects of passive static and ballistic stretching on maximal repetition performance during a resistance training session (RTS). Nine male subjects underwent three experimental conditions: ballistic stretching (BS); passive static stretching (PSS); and a specific warm-up (SW). The RTS was composed of three sets of 12RM for the following exercises: leg press 45 (LP), leg extension (LE), leg curl (LC), and plantar flexors (PF). Performance of six sessions was assessed 48 hours apart. The first visit consisted of a familiarization session including stretching methods and exercises used in the RTS. On the second and third visit, a strength test and retest were performed. During the fourth to the sixth visit, the volunteers randomly performed the following protocols: BS+RTS; PSS+RTS; or SW+RTS. For the sum of the RM number of each three-set exercise, significant differences were found between PSS vs. SW for the LP (p = 0.001); LE (p = 0.005); MF (p = 0.001); and PF (p = 0.038). For the comparison between the methods of stretching PSS vs. BS, significant differences were found only for the FP (p = 0.019). When analyzing the method of stretching BS vs. SW, significant differences were found for the LP (p = 0.014) and MF (p = 0.002). For the total sum of the RM number of three sets of the four exercises that composed the RTS, significant differences were observed (p < 0.05) in the following comparisons: PPS vs. SW (p = 0.001), PPS vs. BS (p = 0.008), and BS vs. SW (p = 0.002). Accordingly, the methods of passive static and ballistic stretching should not be recommended before a RTS.

Influence of Load Intensity on Postexercise Hypotension and Heart Rate Variability after a Strength Training Session.

The purpose of this study was to compare blood pressure and heart rate variability (HRV) responses in trained men after strength training (ST) sessions with loads of 60, 70, and 80% of a 1 repetition maximum (1RM). Eleven men (age: 26.1 ± 3.6 years; body mass: 74.1 ± 8.1 kg; height: 172.0 ± 4.0 cm; body mass index: 25.0 ± 1.96 kg·m(-2); %G: 18.3 ± 6.4) with at least 6-month ST experience participated in this study. After assessment of 1RM loads for the bench press (BP), lat pull-down (LPD), shoulder press (SP), biceps curl (BC), triceps extension (TE), leg press (LP), leg extension (LE), and leg curl (LC), subjects performed 3 experimental sessions in random order. During each experimental session, subjects performed 3 sets of 8-10 repetitions at 60, 70, or 80% of 1RM loads, with 2-minute rest intervals between sets and exercises. All experimental sessions were performed in the following exercise order: BP, LPD, SP, BC, TE, LP, LE, and LC. Before and for 1 hour after each experimental session, blood pressure and HRV were tracked. The results demonstrated a greater duration of postexercise hypotension (PEH) after the 70% of 1RM session vs. the 60 or 80% of 1RM session. These results indicate that the load/volume associated with completion of 8-10 repetitions at 70% of 1RM load may provide the best stimulus for the PEH response when compared with training with a 60 or 80% of 1RM loads. In conclusion, strength and conditioning professionals may prescribe exercises with 60, 70, and 80% of 1RM loads if the intent is to elicit an acute decrease in blood pressure after an ST session; however, 70% of 1RM provides a longer PEH.

Maximal repetition performance, rating of perceived exertion, and muscle fatigue during paired set training performed with different rest intervals.

BACKGROUND/OBJECTIVE: The purpose of this study was to examine rest interval length between agonist-antagonist paired set training (PS) on maximal repetition performance, rating of perceived exertion, and neuromuscular fatigue. METHODS: Fourteen trained men (age, 24.2 ± 1.1 years; height, 175 ± 5.5 cm; body mass, 76.6 ± 7.0 kg) performed two experimental protocols in random order with 2 minutes (P2) or 4 minutes (P4) between agonist-antagonist PS, which consisted of a bench press set followed immediately by a seated row set with 8-repetition maximum loads, respectively. A total of three PS were performed for each rest interval protocol. The total repetitions performed and the rating of perceived exertion were recorded for each exercise set within each rest interval protocol. Electromyography signals were recorded for the posterior deltoid, biceps brachii, pectoralis major, and triceps brachii muscles during the SR exercise. The electromyography signals were then used to calculate a fatigue index for each rest interval protocol. RESULTS: No significant differences were identified in the total repetitions completed between rest interval protocols for the bench press (P2 = 22.9 ± 1.3 and P4 = 22.6 ± 0.8) and seated row (P2 = 25.4 ± 1.7 and P4 = 25.1 ± 1.3). However, a significantly higher fatigue index was found for all muscles under the P2 versus the P4 protocol. CONCLUSION: When performing agonist-antagonist PS, prescribing a shorter rest interval between PS may induce higher levels of fatigue, albeit with similar total repetitions versus a longer rest interval.