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Search Results: 1 - 10 of 9755 matches for " Strength Training "
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Déficit bilateral: origem, mecanismos e implica??es para o treino de for?a
Botton, Cíntia Ehlers;Pinto, Ronei Silveira;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2012, DOI: 10.5007/1980-0037.2012v14n6p749
Abstract: several studies have demonstrated a lower capacity to generate force when the exercises of the training program are performed bilaterally than when compared to the sum of the strength produced by each limb separately. this phenomenon, one that has been well documented in the scientific literature, is called "bilateral deficit." the underlying mechanisms of the bilateral deficit are not fully clear, but they seem to be related to neural mechanisms, such as a blockage of the brain hemispheres, that may occur during bilateral contractions thus reducing the activation of motor units and therefore the strength produced. in relation to each execution form (unilateral and bilateral) in the long term, the adaptations appear to be specific to the type of contraction performed in the training. therefore, due to the relevance of the exercises performed unilaterally and bilaterally in the strength training program, as well as the long-term effect of each execution form in the morphological and neurological adaptations to training, the aim of this article is to characterize the bilateral deficit phenomenon, to explore its main causative mechanisms, and to discuss the influence of each training type (unilateral and bilateral) in the adaptations of strength training.
Efeitos do treinamento resistido sobre a for?a muscular de idosas: uma compara??o entre métodos
Lima, Ricardo Moreno;Bottaro, Martim;Carregaro, Rodrigo;Oliveira, Jaqueline Fernandes de;Bezerra, Lídia Mara Aguiar;Oliveira, Ricardo Jacó de;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2012, DOI: 10.5007/1980-0037.2012v14n4p409
Abstract: strength training (st) increases muscle strength (ms) in the elderly, but results may vary considerably depending on the method of evaluation. objective: this study compared two ms methods to evaluate an st program for elderly women. methods: sixty-one volunteers (mean age 66.8 ± 5.8 years) underwent st for 24 weeks to work out the major muscle groups. knee extensor ms was assessed using one-repetition maximum strength (1rm) and isokinetic dynamometry (60o.s-1) before and after st. a 2x2 anova was used to compare the methods and ms gains after the st program. ms increased significantly after st according to both methods. increases in ms were in average 16.7% and 54.7% using dynamometry and 1rm. the improvement according to 1rm was significantly (p<0.001) greater than that measured using the isokinetic method. although values lied within agreement limits, differences between methods (1rm vs. isokinetic) decreased as ms increased at the end of the st program. st increases ms in older women, but improvement varies considerably according to the method used to evaluate it. measurements using 1rm seem to overestimate strength gains and may, thus, affect the potential results of resistance training.
O efeito do destreinamento de for?a muscular em meninos pré-púberes
Fontoura, Andrea Silveira da;Schneider, Patrícia;Meyer, Flávia;
Revista Brasileira de Medicina do Esporte , 2004, DOI: 10.1590/S1517-86922004000400005
Abstract: the strength trainability in children has been widely explored, however, there is still a questioning with regard to how strength decreases when they stop training. the objective of this study was to evaluate the effect of 12 weeks of muscular strength detraining of boys trained for 12 weeks. seven prepubertal boys (ex 9.4 ± 1.6 years of age) trained three series of 15 repetitions, three times a week for 12 weeks. the training, supervised and developed in equipments, consisted of eight exercises including knee extension (ke) and elbow flexion (ef). the 1-rm test of ne and ef was performed before and after training and 12 weeks after detraining. a similar group of boys (n = 7, 9.7 ± 1.7 years), who did not train served as control (co). after training, the group ex increased (p < 0.05) 1-rm from 14.6 ± 9.8 to 26.2 ± 12.9 kg in ke, and 4.7 ± 2 to 7.9 ± 4.1 kg in fc. after 12 weeks of detraining, the 1-rm was 19.6 ± 11.2 in ne and 6.5 ± 3 kg in fc. the decrease on strength was not statistically significant (p > 0,05). when corrected by the body weight and by the lean body mass (lbm), the 1-rm of ne decreased significantly (p > 0,05) from 0.64 ± 0.1 to 0.45 ± 0.1 and from 0.83 ± 0.2 to 0.61 ± 0.2 of the body weight and lbm, respectively. the ef strength did not decrease significantly when corrected by the body weight and lbm. the strength levels did not change in the first 12 weeks for group co, however, after 24 weeks, it presented an increase of 41% in the 1-rm of ke and 53% in ef. one concludes that, after detraining, the muscular strength presented no significant reduction in absolute values; the results are significant only when corrected by weight and lbm and it is only evidenced for the lower limbs.
Efeito da aplica??o de vibra??o mecanica sobre a impuls?o vertical
Couto, Bruno Pena;Costa, Guilherme Augusto Silva da;Barbosa, Marcos Pinotti;Chagas, Mauro Heleno;Szmuchrowski, Leszek Antoni;
Motriz: Revista de Educa??o Física , 2012, DOI: 10.1590/S1980-65742012000300001
Abstract: several studies have indicated that vibratory training can contribute to the development of muscle strength and sports performance. the aim of this study was to investigate the effect of mechanical vibration application in the direction of the result of muscle forces vector addition on vertical jump. eighteen volunteers performed vertical jump test 20 s before and after the application of mechanical vibration of 20 hz and 6 mm amplitude in the direction of the result of muscle forces vector addition. the same volunteers were used as control group by performing the vertical jump test without pre- and post-test vibration application. the vibratory training caused an significantly increase of 8,5% at vertical jump height while jump height did not vary significantly in the control experiment. these data suggest that the application of mechanical vibration in the direction of muscle forces vector addition can increase the performance in vertical jumps.
Efeito da massagem clássica na percep??o subjetiva de dor, edema, amplitude articular e for?a máxima após dor muscular tardia induzida pelo exercício
Abad, César Cavinato Cal;Ito, Leonardo Takamitsu;Barroso, Renato;Ugrinowitsch, Carlos;Tricoli, Valmor;
Revista Brasileira de Medicina do Esporte , 2010, DOI: 10.1590/S1517-86922010000100007
Abstract: heavy resistance training induces to symptoms of muscle damage which include delayed onset muscle soreness (doms). some strategies (i.e. massage) have been used to attenuate these symptoms and to reduce discomfort associated with doms. this study aimed to investigate the effects of classical massage on doms perception, limb girth (cir), range of motion (adm) and maximum strength performance (1-rm) after a muscle damage protocol. eighteen males were divided into three groups (g1= massage-only, g2= protocol-only, g3= protocol + massage) according to their 1-rm values. doms-inducing protocol consisted of 30 supramaximal eccentric contractions (6 sets of 5 repetitions at 110% 1rm). immediately after the protocol, classical massage was performed in g3 for 6 minutes. doms, cir, adm were assessed 24, 48, 72 and 96 hours after the muscle damage protocol, and maximum strength was evaluated only after 48 and 96 hours. results showed increase in doms and reduction in adm and 1-rm values, in agreement with other studies using similar procedures. however, there was no difference between g2 and g3 in any of the assessed variables. it can be concluded that the muscle damage protocol used in this study was effective in causing alteration in the dependent variables observed. however, classical massage was not effective to minimize the symptoms associated to exercise induced muscle damage.
The effects of athletics training on isometric strength and EMG activity in adolescent athletes
Biology of Exercise , 2012,
Abstract: The aim of this study was to evaluate the effect of two different training programs on electromyographic activity (EMG), isometric strength and quadriceps hypertrophy in track and field athletes. 27 male adolescents athletes were divided in three (3) groups of nine (9), the Neuromuscular Group (NeuroGr), the Hypertrophy Group (HyperGr) and the Control Group (ControlG). The participants in both NeuroGr and HyperGr trained 3 times per week for 8 weeks while the athletes’of ControlGr did not take any exercise. The maximal isometric strength and muscular hypertrophy of all participant’ s right thigh were measured pre, in the middle and at post training programs. At the time - course of 8 weeks the ANOVA revealed a significant improvement in isometric strength (21.4%) and hypertrophy (10.3%) in the athletes of NeuroGr. Similarly, the athletes’ of HyperGr improved in isometric strength and hypertrophy 18% and 15.5% respectively, while no changes were observed in strength elements of ControlGr athletes. Furthermore, the EMG evaluation showed that the hypertrophy increase of HyperGr athletes was a result of both neurophysiological adaptive mechanisms and hypertrophy factors. In athletes of NeuroGr the europhysiological characteristics prevail while the hypertrophy adaptation contribution was limited.
Milovan Bratic,Dragan Radovanovic,Mirsad Nurkic
Acta Medica Medianae , 2008,
Abstract: Higher demands which characterize modern judo and analysis of many new things in the area of periodizations have the aim to enable better training effects and to overcome empiric and elemental work of coaches by varying different methodical training parameters and characteristic situational judo training. Strength training is a form of physical activity used for increasing abilities of surmounting or resisting the power. The increasing in muscular strength results in increased success in performing some motoric tasks. In our research, estimation of selected judo athlete muscular strength is done by combination of laboratory and field tests. The research was conducted in two phases during the 10-week preparation period. The obtained results showed statistically significant high values of muscular strength in most tests. That is why we concluded that the applied preparation strength training resulted in increasing muscular strength in judo athletes. We think that the right periodizations of training enable adequate functional adaptation of judo athletes. Strength training applied in preparation period will lead to adequate increasing in muscular strength of judo athletes which make basis for faster performing of movements and efficient performing of techniques during a match.
Daniele Detanico,Luis Fellipe Flores Muller,Matheus Hofmann,Carlos Alberto Vargas ávila
Brazilian Journal of Biomotricity , 2012,
Abstract: DETANICO, D.; MULLER, L. F. F.; HOFMANN, M. ; áVILA, C. A. V. Electromyographic analysis of biceps brachii and latissimus dorsi in the "lat pull-down" exercise in different handgrips. Brazilian Journal of Biomotricity. v. 6, n. 4, p. 277-284, 2012.The aim of this study was to compare the maximum load in the 1 RM (maximum repetition) test realized of lat pull-down exercise with open pronated handgrip (OPG) and close supinated grip (CSG) and to compare the electromyography activity of biceps brachii and latissimus dorsi muscles in these exercises. Ten male subjects practicing of weightlifting (24.83 ± 2.32 years) took part of this study. The 1 RM test protocol and electromyography activity (% RMS) of biceps brachii and latissimus dorsi were evaluated in two exercises. The t-test and analysis of variance for repeated measures were used and the level of significance was set at 5%. Significant difference was found between two handgrips (p<0.05), with higher values in the CSG. Significant difference was found only in the latissimus dorsi muscle between two handgrips (p <0.05), with higher values in the OPG. We conclude that in the CSG can be used higher load when compared with OPG; electromyography activity was greater in the lat pull-down exercise with the OPG only for the latissimus dorsi muscle, without difference in the biceps brachii.
Gustavo Henrique Rodrigues de Oliveira Ramalho,Mauro Lúcio Mazini Filho,Bernardo Minelli Rodrigues,Gabriela Rezende de Oliveira Venturini
Brazilian Journal of Biomotricity , 2011,
Abstract: RAMALHO, G. H. R. O.; MAZINI FILHO, M. L.; RODRIGUES, B. M.; VENTURINI, G. R. O.; SALGUEIRO, R. S.; PACE JúNIOR, R. L.; MATOS, D. G. The 1RM testing for prediction of load in hypertrophy training and its relation with maximum number of repetitions. Brazilian Journal of Biomotricity. v. 5, n. 3, p. 168-174, 2011. Strength Training is nowadays regarded as an outstanding activity whenever optimized performance is intended. The 1RM test is used as a standard for determining the training load. The present study aims to evaluate the maximal strength through the 1-MR test and the capacity for repetitions with 80% of its maximal strength by testing the maximum number of repetitions (MNR). Participated in the study 24 trained men, 26,6 ± 4,3 years. The MNR test showed an average of 7 repetitions when the load was equivalent to 80% of the maximal strength, a figure considered to be below the standards for the hypertrophic training when compared to the present literature. This result leads to the conclusion that the prescription of training programs may not be effective if based on the load percentage through the 1-MR test, since it presents very low levels of training individualization, not to mention the low practicality of constantly measuring the individual's maximum strength so as to adapt the training load according to the levels of strength gain.
The effect of L-ornithine hydrochloride ingestion on human growth hormone secretion after strength training  [PDF]
Shinichi Demura, Takayoshi Yamada, Shunsuke Yamaji, Miho Komatsu, Koji Morishita
Advances in Bioscience and Biotechnology (ABB) , 2010, DOI: 10.4236/abb.2010.11002
Abstract: This study aimed to examine the effect of L-ornithine hydrochloride ingestion on serum growth hormone secretion response after strength training in young men who did not regularly engage in high intensity exercise. Ten healthy young males without workout habits (age: 22.2 +/- 1.0 yr). Subjects performed biceps curl strength training after L-ornithine hydro- chloride and placebo ingestions. They participated in both of the above conditions randomly with a week interval in between. Serum growth hormone and ornithine levels were measured before L-ornithine hydrochloride or placebo ingestions and at 30 minutes after strength training. Serum growth hormone and ornithine level were measured. A change magnitude of serum growth hormone was significantly larger in the L-ornithine hydrochloride condition than in the placebo condition, and the effect size was also large (t = 1.91, p = .044, ES = .75). A significant interaction (F = 280.98, p = 0.000, ηp2 = 0.96) was found in serum ornithine and a multiple comparison test showed that it was greater in the L-ornithine hydrochloride condition. Serum growth hormone level after strength training increases by L-ornithine hydrochloride ingestion in untrained young males.
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