| Full text | |
| Author(s): |
Nobrega, Sanmy R.
[1]
;
Ugrinowitsch, Carlos
[2]
;
Pintanel, Lucas
[1]
;
Barcelos, Cintia
[1]
;
Libardi, Cleiton A.
[1]
Total Authors: 5
|
| Affiliation: | [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
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | JOURNAL OF STRENGTH AND CONDITIONING RESEARCH; v. 32, n. 1, p. 162-169, JAN 2018. |
| Web of Science Citations: | 12 |
| Abstract | |
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) | |
| FAPESP's process: | 13/21218-4 - The role of the magnitude of muscle damage in hypertrophic responses |
| Grantee: | Cleiton Augusto Libardi |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 15/05650-9 - Acute effects of high and low intensity resistance training performed to volitional fatigue and concentric failure on muscle activationAcute effects of high and low intensity resistance training performed to volitional fatigue and concentric failure on muscle activation |
| Grantee: | Lucas Pintanel Rodrigues |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |