Spring-Mass Behaviour during the Run of an International Triathlon Competition

Abstract : We investigated the changes in step temporal parameters and spring-mass behaviour during the running phase of a major international triathlon competition. 73 elite triathletes were followed during the 2011 World Championships Grand Final. The running speed, ground contact and fl ight times were assessed over a 30 m fl at section at the beginning of the 4 running laps and towards the fi nish line, by using a high-frequency camera (300 Hz). The leg and vertical stiff ness, and vertical displacement of the mass centre were calculated from step temporal characteristics. A concomitant decrease in running speed, vertical stiff ness and leg stiff - ness was reported during the four running laps, except towards the fi nish line, where these parameters increased. Running biomechanics was not aff ected between the beginning and the end of the 10 km run, when triathletes were compared for the same running speed (1.68 ± 0.16 m vs. 1.70 ± 0.17 m for step length, 3.18 ± 0.11 Hz vs. 3.16 ± 0.15 Hz for step rate, 12.87 ± 3.14 kN.m − 1 vs.12.76 ± 3.05 kN.m − 1 for Kleg, 31.18 ± 4.71 kN.m − 1 vs.30.74 ± 3.88 kN.m − 1 for Kvert, at lap1 and fi nish, respectively). Independent of the cofounding eff ect of speed and despite the neuromuscular fatigue previously shown after a long-duration event, the lower limb mechanical stiff ness and the overall springmass regulation were not altered over the 10 km triathlon run in elite competitors. This study showed also that step length explained, to a greater extent than step frequency, the running speed variance in elite triathletes.
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International Journal of Sports Medicine, Thieme Publishing, 2012, 〈10.1055/s-0032-1331205〉
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Yann Le Meur, Bernard Thierry, Giuseppe Rabita, S. Dorel, G. Honnorat, et al.. Spring-Mass Behaviour during the Run of an International Triathlon Competition. International Journal of Sports Medicine, Thieme Publishing, 2012, 〈10.1055/s-0032-1331205〉. 〈hal-01662579〉

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