Triathlon is a multisport in which the transition between the phases of a triathlon is a unique feature of this sport. It has already been showed that the run session after cycling may affect performance but also injury risk. Indeed, up to 70% of triathletes have been seen to run at speeds 10% below their normal running speed over the first 500-1000m following cycling in an Olympic triathlon. Also, Rendos et al. (2013) showed that 30 min cycling induces changes in running kinematics of the pelvis, and hip, that may increase the risk for lower extremity injuries. In particular, these authors reported an increase in anterior pelvic tilt and a reduced hip extension in running following cycling. They emitted the hypothesis that those changes were related to the position on the bike causing tightness in the anterior musculature. Recently, Dewolf and colleagues (Dewolf & De Jaeger, 2015; Dewolf, Mesquita, & De Jaeger, 2022) suggested that a change of the overall lower limb stiffness affects significantly the angle of maximal hip extension and anterior pelvic tilt. Because of the reported changes in joint stiffness during running following cycling (Sayers, 2012), one may expect that the modification observed in Rendos et al. (2013) are not only related to the position on the bike. To test the contribution of cycling position, the run prior and post cycling was evaluated in triathletes divided into two groups: one group with a more flexed posture on the bike, and the other one with a straighter posture. The effect of cycling on pelvic and hip kinematics were compared before and after the cycling effort in the two groups. We hypothesized that the modification observed after a 30 min cycling effort will not be influenced by the position on the bike.
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