Muscle Hypertrophy Response Is Affected by Previous Resistance Training Volume in Trained Individuals
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Maira C. Scarpelli [1] ; Sanmy R. Nóbrega ; Natalia Santanielo Silva ; Ieda F. Alvarez [1] ; Gabriele B. Otoboni [1] ; Carlos Ugrinowitsch ; Cleiton Augusto Libardi
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[1] Universidade Federal de São Carlos
Universidade Federal de São Carlos
Brasil
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- Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 36, Nº. 4, 2022, págs. 1153-1157
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
The purpose of this study was to compare gains in muscle mass of trained individuals after a resistance training (RT) protocol with standardized (i.e., nonindividualized) volume (N-IND), with an RT protocol using individualized volume (IND). In a within-subject approach, 16 subjects had one leg randomly assigned to N-IND (22 sets[middle dot]wk-1, based on the number of weekly sets prescribed in studies) and IND (1.2 x sets[middle dot]wk-1 recorded in training logs) protocols. Muscle cross-sectional area (CSA) was assessed by ultrasound imaging at baseline (Pre) and after 8 weeks (Post) of RT, and the significance level was set at p < 0.05. Changes in the vastus lateralis CSA (difference from Pre to Post) were significantly higher for the IND protocol (p = 0.042; mean difference: 1.08 cm2; confidence interval [CI]: 0.04-2.11). The inferential analysis was confirmed by the CI of the effect size (0.75; CI: 0.03-1.47). Also, the IND protocol had a higher proportion of individuals with greater muscle hypertrophy than the typical error of the measurement (chi-square, p = 0.0035; estimated difference = 0.5, CI: 0.212-0.787). In conclusion, individualizing the weekly training volume of research protocols provides greater gains in muscle CSA than prescribing a group standard RT volume.
