The total volume of a resistance exercise is
determined by multiplying the number of repetitions by
load. Although further investigations are needed, evidence
has suggested that total volume can determine increases in
muscle strength and endurance in younger and older
adults (Galvão and Taffe, 2005; Robbins et al., 2012).
Within this context, the use of longer or shorter RI could
prove to be a strategy for changing the total volume, and,
hence, other variables (e.g., fatigue-related metabolites)
(Ratamess et al., 2007; Willardson and Burkett, 2005).