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Effects Of Resistive Load On Performance And Surface EMG Activity During Repeated Cycling Sprints On A Non-isokinetic Cycle Ergometer

Ryouta Matsuura, Takuma Arimitsu, Takahiro Yunoki, Tokuo Yano
Published 2009 · Medicine
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Objectives To determine the effects of resistive load on performance and surface electromyogram (SEMG) activity during repeated cycling sprints (RCS) on a non-isokinetic cycle ergometer. Methods Participants performed two RCS tests (ten 10-second cycling sprints) interspersed with both 30- and 360-second recovery periods under light (RCSL) and heavy load conditions (RCSH) in a random counterbalanced order. Recovery periods of 360 seconds were set before the fifth and ninth sprints. Results In the 9th and 10th sprints, the values of peak power output divided by body mass were significantly higher in RCSH than in RCSL. Changes in blood lactate concentration were not different between the two conditions. In RCSL, the root mean square calculated from the SEMG was significantly lower in the ninth sprint than in the first sprint, but there were no differences between the root mean square in the first sprint and that in the ninth sprint in RCSH. Conclusions During RCS on a non-isokinetic cycle ergometer, performance and SEMG activity are influenced by resistive load. It is thought that regulation of skeletal muscle recruitment by the central nervous system is associated with fatigue during RCS with a light resistive load.
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