Time trial exertion traits of cycling's grand tours

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Deutscher übersetzter Titel:Zeitfahrmerkmale der großen Radrundfahrten
Autor:Earnest, C.P.; Foster, C.; Hoyos, J.; Muniesa, C.A.; Santalla, A.; Lucia, A.
Erschienen in:International journal of sports medicine
Veröffentlicht:30 (2009), 4, S. 240-244, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:0172-4622, 1439-3964
DOI:10.1055/s-0028-1105948
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Erfassungsnummer:PU200905002777
Quelle:BISp

Abstract

We examined 26 professional riders during time trial (TT) competitions of the Grand Tours of cycling (Tour de France and Vuelta Espana; 1997-2003) for the exertional characteristics of contending vs. non-contending (i.e., support) riders. We categorized HR time during TT into training impulse (TRIMP) defined from seasonal VO2max testing [Phase I (<ventilatory threshold (VT≈64% VO2max); Phase II (VT - respiratory compensation threshold, ≈83% VO2max); Phase III >RCP]. Races were: Short TT (<15 km; 8.9 +/- 2.9 km); Individual TT (>15 km; 48.12 +/- 8.7 km); Uphill TT (20.0 +/- 8.7 km) and Team TT (44.1 +/- 20.9 km). We observed statistically significant event-by-contender interactions for all TT (all, P<0.0001) except the short TT. During uphill TT, contenders exerted fewer total TRIMP (P<0.01), more Zone 3 TRIMP (P<0.05), and fewer Zone 2 TRIMP (P<0.01) vs. non-contenders. For individual TT, contenders accumulated more Total and Zone 3 TRIMP vs. non-contenders (all, P<0.05). Interestingly, during the team TT, contenders accumulated more Zone 3, and fewer Zone 2 TRIMP (all, P<0.05), despite having the opportunity to draft behind other riders while in paceline race formation. During TT events, contending riders compete at a level of exertion corresponding to a higher metabolic demand during the uphill TT, individual TT and team TT. Verf.-Referat