Maximal and submaximal intended velocity squat sets: Do they selectively impact mechanical performance in paired multijoint upper-body exercise sets?

This study aimed to investigate how squat protocols performed at maximal and submaximal intended velocities during interset periods of paired upper-body exercises that impact the mechanical performance of these multijoint upper-body exercises. Twenty-one young and healthy adults (seven women) completed three experimental sessions, each comprising four sets of five repetitions at 75% of their 1-repetition maximum, with a 4-min break between sets using the bench press and bench pull exercises. The experimental sessions differed in the protocol utilized during the interset periods: (i) Passive-no physical exercise was performed; (ii) SQ(fast)-5 repetitions of the squat exercise at maximal intended velocity against the load associated with a mean velocity (MV) of 0.75 m s(-1); and (iii) SQ(slow)-5 repetitions of the squat exercise at submaximal velocity (intended MV of 0.50 m s(-1)) against the load associated with an MV of 0.75 m s(-1). Level of significance was p <= 0.05. The main findings revealed negligible differences (effect size [ES] < 0.20) among the exercise protocols (passive vs. SQ(fast) vs. SQ(slow)) for all mechanical variables during the bench pull, whereas during the bench press, small differences (ES from 0.23 to 0.31) emerged favoring the passive protocol over SQ(fast) and SQ(slow) in terms of mean set velocity and fastest MV of the set. The absence of significant differences between the SQ(fast) and SQ(slow) protocols, irrespective of the particular upper-body exercise, implies that the intended lifting velocity does not influence the potential interference effect during paired set training procedures.