eazy
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Similar muscle hypertrophy following eight weeks of resistance training to momentary muscular failure or with repetitions-in-reserve in resistance-trained individuals
5.Conclusion
Overall, we observed that terminating sets with a perceived 1- to 2-RIR can be sufficient to promote similar hypertrophy of the quadriceps as reaching momentary muscular failure in resistance-trained individuals over eight weeks. Our findings also highlight that muscle-specific hypertrophy may depend on exercise selection, exercise order, and subsequent muscula-ture targeted. Importantly, our sample of participants were able to predict RIR within one repetition from the target RIR, and whether higher or lower RIR accuracy would influence our results is unclear. Performing RT with 1- to 2-RIR also allows for similar volume load and repetition volume accumulation as reaching momentary muscular failure, possibly influencing the overall RT stimulus achieved. Indeed, repetition loss from the first to the final set was greater when sets were terminated at momentary muscular failure versus with 1- to 2-RIR, likely con-tributing to the similar volume observed between protocols. Although performing RT to momentary muscular failure con-sistently induced higher levels of acute neuromuscular fatigue versus RT performed with 1- to 2-RIR, we observed improved fatigue resistance that may attenuate acute neuromuscular fatigue and subsequent repetition loss across eight weeks (but may depend on the exercise performed). To our knowl-edge, the present study is the first to compare RT performed to momentary muscular failure versus with 1- to 2-RIR (using RIR prescription) on muscle hypertrophy and neuromuscular fati-gue over an 8-week intervention period in resistance-trained males and females, further advancing the understanding of proximity-to-failure and providing practical recommendations that can be applied across different demographics (i.e., general population, sports athletes, bodybuilders).