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1.
J Strength Cond Res ; 30(3): 710-6, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26907842

RESUMO

The aim of this study was to investigate the acute effects of different interset rest intervals on performance of single- and multijoint exercises with near-maximal loads. Fifteen trained men (26.40 ± 4.94 years, 79.00 ± 7.10 kg, 176.6 ± 6.06 cm, 11.80 ± 2.47% body fat, and bench press relative strength: 1.26 ± 0.19 kg·kg of body mass) performed eight sessions (2 exercises × 4 interset rest intervals); each consisting of 5 sets with a 3RM load. The exercises tested were the machine chest fly (MCF) for the single-joint exercise and the barbell bench press (BP) for the multi-joint exercise with 1, 2, 3, and 5 minutes of rest between sets. The results indicated that for the MCF, significantly higher total number of repetitions were completed for the 2- (12.60 ± 2.35 reps; p = 0.027), 3- (13.66 ± 1.84 reps; p = 0.001), and 5-minute (12.93 ± 2.25 reps; p = 0.001) vs. the 1-minute (10.33 ± 2.60 reps) protocol. For the BP, a significantly higher total number of repetitions were completed for 3- (11.66 ± 2.79 reps; p = 0.002) and 5-minute (12.93 ± 2.25 reps; p = 0.001) vs. the 1-minute protocol (7.60 ± 3.52 reps). In addition, subjects completed significantly higher total number of repetitions for the 5-minute (12.93 ± 2.25 reps; p = 0.016) vs. 2-minute (9.53 ± 3.11 reps) protocol. Both exercises presented similar and progressive reductions in repetition performance for all rest protocols along the 5 sets, starting as soon as the second set for the shorter 1-minute rest protocol. In conclusion, to maintain the best consistency in repetition performance, rest intervals of 2 minutes between sets are sufficient for the MCF and 3-5 minutes for the BP. Thus, it appears that longer acute recovery time is needed for a multijoint (core) exercise such as the BP vs. a single-joint (assistance) exercise such as the MCF.


Assuntos
Treinamento de Resistência/métodos , Descanso/fisiologia , Levantamento de Peso/fisiologia , Adulto , Exercício/fisiologia , Teste de Esforço , Humanos , Masculino , Fatores de Tempo , Adulto Jovem
2.
J Sports Med Phys Fitness ; 56(3): 214-22, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-25732318

RESUMO

BACKGROUND: The aim of this paper was to analyze how the rest between interval repetitions in intra-set training (at maximal isometric loads) could affect the ability to repeat maximal contractions in subjects with different levels of performance and different experience in strength development work. METHODS: Twenty subjects were divided randomly into two different groups depending on their sport characteristics: ten subjects were trained in strength development work (Group Strenght--23.1±4.6 years; 172.0±5.3 cm; 79.9±12.1 kg; 2175.6±490.8 N; 46.9±4.9 mL/kg.min), and ten subjects were trained in endurance work (Group Endurance--21.3±4.5 years; 172.4±4.1 cm; 60.0±4.6 kg; 815.5±206.5 N; 67.4±4.9 mL/kg.min). To assess the ability to repeat maximal efforts, 20 repetitions of 5 seconds were performed in a half-squat position, with 1 minute of rest between repetitions. RESULTS: For both groups, four different phases were observed in the Interval Maximal Force test during the 20-repetition assessment: potentiation, maintenance, moderate loss, and significant loss. For the GE, the loss in maximum strength capacity began in the fourth repetition (GS4th: 3.4%, ns, Effect Size: 0.09 vs. GE3th: 1.6%; ns; ES: 0.06) and reached a statistically significant value in the twelfth repetition (GS12th: 12.7%, P=0.03, ES: 0.35 vs. GE7th: 12.5%; P=0.01; ES: 0.49). The number of repetitions at which the strength began to decrease depended on the subject's sport characteristic and performance level. CONCLUSIONS: This study shows how an appropriate intra-set rest inclusion can significantly increase the work performed in every set without changing the muscle contraction characteristics, thus delaying muscle fatigue and maintaining the desired training objective.


Assuntos
Contração Isométrica/fisiologia , Força Muscular/fisiologia , Treinamento de Resistência/métodos , Descanso/fisiologia , Humanos , Masculino , Fadiga Muscular/fisiologia , Distribuição Aleatória , Adulto Jovem
3.
Arch. med. deporte ; 28(143): 181-187, mayo-jun. 2011. tab, graf
Artigo em Espanhol | IBECS | ID: ibc-102590

RESUMO

El objetivo del presente estudio fue investigar el grado de catabolismo del colágeno a través de los niveles de excreción urinaria de hidroxiprolina (HP), evaluados en diferentes momentos, en 37 bomberos del 1º Agrupamiento de rescate (GMAR)del Estado de Rio de Janeiro (Brasil) del sexo masculino, que realizan entrenamiento físico regular, con un promedio de 29años, divididos en dos grupos: grupo control (n=17) el cual no sufrió ningún tipo de intervención y el grupo experimental (n=20) que fue sometido a trabajo máximo de flexibilidad estática. Como procedimiento metodológico se realizó la toma de 4muestras urinarias por cada individuo. La primera se realizó antes de la intervención para obtener una referencia del nivel basal de HP. La segunda, tercera y cuarta se realizaron a las24h, 48h y 72 horas respectivamente después del estiramiento, respetando un ayuno de 12 horas antes de la obtención de las muestras. Para la determinación de los niveles de HP urinaria fue utilizado el kit ClinRep (complete kit para hydroxyproline en orine) a través del método colorimétrico. Los resultados encontrados en el grupo experimental fueron: A basal - 24hrs=1,99 mg/ 24hrs.; A 24 hrs – 48 hrs = 9,01 mg/ 24 hrs; A 48hrs -72 hrs= - 9,90 mg/ 24 hrs y A Basal - 72 hrs = 1,09 mg/24hrs. Por los resultados, se concluye que hubo incremento significativo en la concentración de HP entre los instantes basal y pasadas 24hrs (p= 0,000), también se constató aumento significativo tras 48hrs (p=0,000), y un descenso de concentración después de las 72 hrs (p=0,353) que casi iguala al nivel del instante basal, determinando así que la evolución en los valores urinarios de HP puede ser un indicador bioquímico del proceso de reparación del tejido conjuntivo del sistema músculo-esquelético sometido a un estiramiento máximo (AU)


The purpose of this study was to investigate the degreeo fcatabolism of collagen as measured by levels of urinary excretion of hydroxyproline (HP) after static stretching exercise. Study participants were 37 firefighters from the 1st GMAR of the State of Rio de Janeiro of the male gender, who are doing regular physical training, = + 29 years old, divided into two groups: control group (n = 17) which has not undergone any type of intervention and the experimental group (n = 20) which was submitted to static stretching exercise. As a methodological procedure was performed 4 urine samples for each individual. The first collection was performed before the procedure to verify the level of HP as reference of the sample group (basal). The second, third and fourth collections were performed 24h, 48 hand 72 hours after stretching static, with a fasting of 12 hours before sampling. For the determination of urinary levels of HP, was used ClinRep (complete kit for hydroxyproline in urine) by the method colorimetric. The results found on the levels of HP: A basal-24h=1,99 mg/24h. ; A 24h-48h= 9,01 mg/24h; A 48h-72h= - 9,90 mg/24h e A Basal-72h= 1,09 mg/24h. For the results it is concluded that there was a difference in the concentrations of HP between the baseline and 24h (p =0,001 <0.05), with a significant increase in 48h (p = 0,001<0.05) and a recovery concentration after 72h (p = 0,353>0.05), matching it to the original level of the basal time, there by determining that HP may be a biochemical index in the process of tissue repair and remodeling after exercise (AU)


Assuntos
Humanos , Masculino , Adulto , Hidroxiprolina/urina , Esforço Físico/fisiologia , Limiar Anaeróbio/fisiologia , Maleabilidade/fisiologia , Fenômenos Fisiológicos Musculoesqueléticos
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