Lengthened Partial Repetitions Elicit Similar Muscular Adaptations as a Full Range of Motion During Resistance Training in Trained Individuals
DOI:
https://doi.org/10.51224/SRXIV.455Keywords:
range of motion, hypertrophy, strength, rom, lengthened partials, full romAbstract
Purpose: The purpose of this study was to compare the effects of lengthened partial repetitions versus full range of motion (ROM) resistance training (RT) on muscular adaptations. Methods: In this within-participant study, thirty healthy, resistance-trained participants had their upper extremities randomly assigned to either a lengthened partial or full ROM condition; all other training variables were equivalent between limbs. The RT intervention was a multi-exercise, multi-modality eight-week program targeting the upper-body musculature. Training consisted of two training sessions per week, with four exercises per session and four sets per exercise. Muscle hypertrophy of the elbow flexors and elbow extensors was evaluated using B-mode ultrasonography at 45 and 55% of humeral length. Muscle strength-endurance was assessed using a 10-repetition-maximum test on the lat pulldown exercise, both with a partial and full ROM. Data analysis employed a Bayesian framework with inferences made from posterior distributions and the strength of evidence for the existence of a difference through Bayes factors. Results: Both muscle thickness and 10-repetition-maximum improvements were similar between the two conditions. Results were consistent across outcomes with point estimates close to zero, and Bayes factors (0.16 to 0.3) generally providing “moderate” support for the null hypothesis of equal improvement across interventions. Conclusions: Based on present findings and other studies, trainees seeking to maximize muscle size should likely emphasize the stretched position, either by using a full ROM or lengthened partials during upper-body resistance training. For muscle strength-endurance, our findings suggest that lengthened partials and full ROM elicit similar adaptations irrespective of the excursed ROM.
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Copyright (c) 2024 Milo Wolf, Patroklos Androulakis Korakakis, Alec Piñero, Adam E. Mohan, Tom Hermann, Francesca Augustin, Max Sappupo, Brian Lin, Max Coleman, Ryan Burke, Jeff Nippard, Paul A. Swinton, Brad J. Schoenfeld (Author)
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