Effect of cadence on volume and myoelectric activity during agonist-antagonist paired sets (supersets) in the lower body

The aim of this study was to investigate the effect of cadence on volume load (VLoad) and muscle activity during agonist -antagonist paired sets (APS) in the lower body. Twelve trained men (24.0 +/- 3.3years; 78.3 +/- 9.7kg; 1.77 +/- 0.58m) volunteered to participate in this study. After the 10 maximum repetition test for leg extension and seated leg curl, participants performed three experimental protocols: first protocol (traditional)three sets of only leg extension (60bpm); second protocol (fast cadence)three sets of leg extension, with each set preceded by one set on the seated leg curl with fast cadence (90bpm); third protocol (slow cadence)similar to the second, but seated leg curl with slow cadence (40bpm). The total number of repetitions, VLoad and the electromyography activity for the vastus lateralis, vastus medialis and rectus femoris muscles were recorded. The VLoad was higher during APS than the traditional method, but the cadence (fast or slow) of antagonist exercise did not influence VLoad. Muscle activity of vastus lateralis was higher during traditional protocol; on the other hand, rectus femoris showed higher activity on APS fast cadence protocol, indicating that APS has a different influence on quadriceps components.