RESUMEN
Brentano, MA, Umpierre, D, Santos, LP, Lopes, AL, Radaelli, R, Pinto, RS, and Kruel, LFM. Muscle damage and muscle activity induced by strength training super-sets in physically active men. J Strength Cond Res 31(7): 1847-1858, 2017-In strength training, muscle activity is often analyzed by surface electromyography (EMG) and muscle damage through indirect markers, such as plasma concentrations of creatine kinase (CK) after exercise. However, there is little information about the influence of the strength exercises order on these parameters. The purpose of this study is to analyze the effect of strength exercises order (super-sets) in muscle activity and indirect markers of muscle damage. Twenty men were randomly assigned to one of the strength training sessions (TS). Each TS (5 sets × 8-10 repetition maximum) consisted of 2 exercises for the knee extensor muscles and 2 exercises for the horizontal shoulder flexors performed in a different order: exercises for the same muscle group grouped (grouped exercises [GE]: n = 10; 26.6 ± 3.4 years; 17.4 ± 3.4 body fat) or separated (separated exercises [SE]: n = 10; 24.9 ± 2.6 years; 15.4 ± 5.9 body fat). Muscle activity was analyzed by surface EMG (vastus lateralis [VL], vastus medialis [VM], rectus femoris [RF], pectoralis major [PM], and anterior deltoid [AD]), and the main indirect marker of muscle damage was the CK, evaluated immediately before and after the first 5 days of each TS. There was a higher EMG activity of GE in the RF (GE: 88.4% × SE: 73.6%) and AD (GE: 176.4% × SE: 100.0%), in addition to greater concentration of CK (GE: 632.4% × SE: 330.5%) after exercise. Our findings suggest that, in physically active men, implementing super-sets with GE promotes greater muscle effort and muscle damage, wherein 5 days are not enough to recover the trained muscle groups.
Asunto(s)
Ejercicio Físico/fisiología , Fuerza Muscular/fisiología , Músculo Esquelético/fisiología , Entrenamiento de Fuerza/métodos , Adulto , Creatina Quinasa/sangre , Electromiografía , Humanos , Rodilla/fisiología , Masculino , Hombro/fisiología , Adulto JovenRESUMEN
The aim was to analyze the relationship between the perceived exertion (PE) and different loads in strength exercises (SEs), in sedentary, active, and trained adult subjects. Thirty young men (18-34 years) were divided into 3 groups (experimental group [EG]): sedentary EG (SEG), physically active group (PAG), and the strength trained group (STG). Maximum strength was established using the 1 repetition maximum test (1RM). Using series of 12 repetitions, different loads were applied until the 4 ratings of PE (RPEs) (11, 13, 15, and 17) from 15 category Borg Perceived Exertion Scale (RPE 6-20). The pace of the repetitions and the intervals between the sets were controlled, the loads were blind, the order of the RPE randomized, whereas the PE was localized and determined after completion of the series. Strength correlations between the RPE and the %1RM, according to the EGs and SEs (0.826-0.922, p < 0.001), were observed. Similar behavior was seen in the SEs. Higher loads are related to higher RPEs and are differentiated between the EGs. The STG used higher %1RM when compared to the SEG, whereas the PAG, displayed an intermediary behavior in relation to the other groups. The use of PE represents a reliable instrument for the measurement of intensity in strength training.
Asunto(s)
Esfuerzo Físico/fisiología , Aptitud Física/fisiología , Entrenamiento de Fuerza , Adolescente , Adulto , Humanos , Masculino , Fuerza Muscular/fisiología , Percepción , Conducta Sedentaria , Soporte de Peso/fisiología , Adulto JovenRESUMEN
Strength training (ST; high intensity/low volume/long rest) has been used in several populations, including children, young adults, and older adults. However, there is no information about circuit weight training (CWT; low intensity/high volume/short rest) in apparently healthy postmenopausal women. The purpose of the present study was to analyze the effects of high-intensity ST and circuit training on isometric strength (IS), upper limb dynamic strength (ULS) and lower limb dynamic strength (LLS), muscle activation of quadriceps (EMG quad), maximal oxygen uptake (VO2 max), time to exhaustion (TE), and bone mineral density (BMD). Twenty-eight postmenopausal women were divided into 3 groups: 1) ST group (STG, n = 9, 45-80% 1 repetition maximum (1RM), 2-4 sets, 20-6 reps), 2) circuit training group (CTG, n = 10, 45-60% 1RM, 2-3 sets, 20-10 reps), and 3) a control group (CON, n = 9, no exercise). Significance level was defined as p Asunto(s)
Adaptación Fisiológica
, Osteoporosis Posmenopáusica/rehabilitación
, Entrenamiento de Fuerza/métodos
, Levantamiento de Peso/fisiología
, Composición Corporal
, Densidad Ósea
, Electromiografía
, Femenino
, Humanos
, Contracción Isométrica
, Fuerza Muscular
RESUMEN
O inremento na produçäo de força do músculo esquelético, induzido pelo treinamento de força, näo depende somente da quantidade ou qualidade dos músculos envolvidos no exercícios, mas também da habilidade do sistema nervoso em ativar adequadamente os grupos musculares envolvidos. O treinamento de força parece provocar alteraçöes no sistema nervoso (adaptaçöes neurais) que proporcionam uma otimizaçäo na ativaçäop dos grupos musculares, além de um aprimoramento na coordenaçäo dos movimentos. O termo "adaptaçöes neurais" tem sido utilizado para resumir os fenômenos que influenciam no aumento da força, e a técnica de eletromiografia (EMG)tem mostrado indícios de adaptaçöes no sistema nervoso, uma vez que, diversos estudos mostram que o incremento na força, proporcionado pelo treinamento, é acompanhado por um aumento do sinal EMG, fenômeno que vem sendo observado em homens, mulheres, idosos e crianças. Sendo assim, parece provável que o aspecto neural possa ser avaliado através da técnica da EMG.(au)