Modification of Cycling Biomechanics during a Swim-to-Cycle Trial

in Journal of Applied Biomechanics
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The aim of this study was to investigate the effects of drafting, i.e., swimming directly behind a competitor, on biomechanical adaptation during subsequent cycling. Eight well-trained male triathletes underwent three submaximal sessions in a counterbalanced order. These sessions comprised a 10-min ride on a bicycle ergometer at 75% of maximal aerobic power (MAP) at a freely chosen cadence. This exercise was preceded either by a 750-m swim performed alone at competition pace (SCA trial: swimming-cycling alone), a 750-m swim in a drafting position at the same pace as during SCA (SCD trial: swimming-cycling with drafting), or a cycling warm-up at 30% of MAP for the same duration as the SCA trial (CTRL trial). The results indicated that the decrease in metabolic load when swimming in a drafting position (SCD trial) was associated with a significantly lower pedal rate and significantly higher mean and peak resultant torques when compared to the SCA trial, p < 0.05. These results could be partly explained by the lower relative intensity during swimming in the SCD trial when compared with the SCA trial, involving a delayed manifestation of fatigue in the muscles of the lower limbs at the onset of cycling.

Sport Ergonomy and Performance Laboratory, University of Toulon-Var, Ave. de l’Université, BP 132, 83957 La Garde cedex, France; 2Biomechanics and Physiology Laboratory, National Institute of Sport and Physical Education, 11 Ave. du Tremblay, 75012 Paris, France.