| Texto completo | |
| Autor(es): |
Nobrega, Sanmy R.
[1]
;
Ugrinowitsch, Carlos
[2]
;
Pintanel, Lucas
[1]
;
Barcelos, Cintia
[1]
;
Libardi, Cleiton A.
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Fed Sao Carlos, Dept Phys Educ, Lab Neuromuscular Adaptat Resistance Trai, Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Dept Sport, Sch Phys Educ & Sport, Sao Paulo, SP - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF STRENGTH AND CONDITIONING RESEARCH; v. 32, n. 1, p. 162-169, JAN 2018. |
| Citações Web of Science: | 12 |
| Resumo | |
The purpose of this study was to investigate the effects of resistance training (RT) at high-and low-intensities performed to muscle failure or volitional interruption on muscle strength, cross-sectional area (CSA), pennation angle (PA), and muscle activation. Thirty-two untrained men participated in the study. Each leg was allocated in 1 of 4 unilateral RT protocols: RT to failure at high and low intensities, and RT to volitional interruption (repetitions performed to the point in which participants voluntarily interrupted the exercise) at high (HIRT-V) and low (LIRT-V) intensities. Muscle strength (1 repetition maximum {[}1RM]), CSA, PA, and muscle activation by amplitude of the electromyography (EMG) signal were assessed before (Pre), after 6 (6W), and 12 (12W) weeks. 1RM increased similarly after 6W (range: 15.8-18.9%, effective size {[}ES]: 0.41-0.58) and 12W (range: 25.6-33.6%, ES: 0.64-0.98) for all protocols. All protocols were similarly effective in increasing CSA after 6W (range: 3.0-4.6%, ES: 0.10-0.24) and 12W (range: 6.1-7.5%, ES: 0.22-0.26). PA increased after 6W (similar to 3.5) and 12W (similar to 9%; main time effect, p < 0.0001), with no differences between protocols. EMG values were significantly higher for the high-intensity protocols at all times (main intensity effect, p < 0.0001). In conclusion, both HIRT-V and LIRT-V are equally effective in increasing muscle mass, strength, and PA when compared with RT performed to muscle failure. (AU) | |
| Processo FAPESP: | 13/21218-4 - O papel da magnitude de dano muscular nas respostas hipertróficas |
| Beneficiário: | Cleiton Augusto Libardi |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 15/05650-9 - Efeito agudo do treinamento de força de alta e baixa intensidade realizado até fadiga voluntária e falha concêntrica na ativação muscular |
| Beneficiário: | Lucas Pintanel Rodrigues |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |