Effect of pedaling cadence on physiological responses and neuromuscular fatigue during a single interval-training session
Keywords:
muscular torque; isometric twitch; heart rate; electromyography; neuromuscular stimulationAbstract
The present study investigated the effect of pedaling cadence on neuromuscular fatigue of the knee extensor muscles following an interval training (IT) session. Nine trained male cyclists performed three 45-min IT session (6 x 5 min work intervals at 80% of peak power output separated by 2.5 min active recovery period) with 3 different pedaling cadence (60, 90 and 110 rpm), in a random order. Neuromuscular tests were performed before and immediately after the three trials. Heart rate (HR) and electromyography (EMG) activity of thigh muscles were measured throughout IT sessions and RPE at the end of each work interval. Although reduction in maximal voluntary contraction torque was similar after the 3 IT sessions, decreases in peak doublet and peak twitch were significantly greater after IT110. Compared to IT60 and IT90, HR and EMG activity of vastus medialis were significantly higher during IT110. Performing IT session with high pedaling cadence resulted in additional peripheral muscular fatigue and cardiovascular demand that may be explained in part by a greater fast fiber recruitment in quadriceps.
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