Author’s Reply to Souza et al: Comment on: “Volume for Muscle Hypertrophy and Health Outcomes: The Most Effective Variable in Resistance Training”
Firstly, the point regarding intensity of load and “intensity of effort” seems out-of-place. We agree that intensity of load is not adequate to measure “intensity of effort” and vice versa, as they measure different parameters. While intensity of load is widely applied in the literature, since it is an objective, comparable and easily controlled variable, “intensity of effort” is subjective, difficult to control, and may introduce bias when comparing different studies . Souza et al.  suggested that low volume but higher “intensities of effort” promote similar hypertrophy to high volumes, citing volitional failure (VF) and blood-flow restriction (BFR) as means to achieve that. However, VF has not been shown to be superior to non-failure for eliciting muscle adaptations [4, 5, 6]. Souza et al. cited Mitchell et al.  to suggest that...
Compliance with Ethical Standards
No sources of funding were used to assist in the preparation of this letter.
Conflict of interest
Vandré Casagrande Figueiredo, Belmiro Freitas de Salles and Gabriel Trajano declare they have no conflicts of interest relevant to the content of this letter.
- 1.Souza DC, Viana RB, Coswig VS, Fisher JP, Steele J, Gentil P. Comment on: “Volume for muscle hypertrophy and health outcomes: the most effective variable in resistance training”. Sports Med. 2017. https://doi.org/10.1007/s40279-018-0865-9
- 6.Nóbrega SR, Libardi CA. Is resistance training to muscular failure necessary? Front Physiol. 2016;29(7):10.Google Scholar
- 8.Mitchell CJ. Determinants of the magnitude of resistance training mediated muscle hypertrophy. Doctoral Dissertation. 2014. Retrieve from http://hdl.handle.net/11375/13822.
- 20.de França HS, Branco PA, Guedes Junior DP, Gentil P, Steele J, Teixeira CV. The effects of adding single-joint exercises to a multi-joint exercise resistance training program on upper body muscle strength and size in trained men. Appl Physiol Nutr Metab. 2015;40(8):822–6. https://doi.org/10.1139/apnm-2015-0109.CrossRefPubMedGoogle Scholar