The effects of exercise intensity or drafting during swimming on subsequent cycling performance in triathletes

Détails

ID Serval
serval:BIB_066E7C0581F6
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The effects of exercise intensity or drafting during swimming on subsequent cycling performance in triathletes
Périodique
Journal of Science and Medicine in Sport / Sports Medicine Australia
Auteur(s)
Bentley D.J., Libicz S., Jougla A., Coste O., Manetta J., Chamari K., Millet G.P.
ISSN
1440-2440
Statut éditorial
Publié
Date de publication
2007
Peer-reviewed
Oui
Volume
10
Numéro
4
Pages
234-243
Langue
anglais
Résumé
The purpose of this study was to compare the affects of drafting or a reduction of exercise intensity during swimming on the power output sustained (P(mean)) during a subsequent cycle time trial (TT). In addition the relationship between peak power output (PPO) and P(mean) generated during the cycle TT after swimming was examined. Nine well-trained triathletes performed an incremental cycling test to exhaustion for determination of PPO. In addition, each subject performed three swim-cycle (SC) trials consisting of 20 min cycle TT preceded by a 400 m swimming trial completed as (1) "all out" and in a non-drafting situation (SC(100%)); (2) at 90% of SC(100%) in a non-drafting situation (SC(90%)); (3) in a drafting position at the same controlled velocity as SC(100%) (SC(drafting)). Swimming velocity (ms(-1)) was significantly (p<0.01) lower at each time point during the 400 m swimming trial in SC(90%) compared with SC(100%) and SC(drafting). There was no significant difference in velocity between SC(100%) and SC(drafting). Blood lactate (BLA) concentration was also significantly (p<0.01) lower after swimming in SC(90%) compared to SC(100%) and SC(drafting) (3.8+/-0.9 versus 7.3+/-2.4 and 7.9+/-2.4mM). The Pmean was also significantly (p<0.05) lower in SC(100%) relative to the SC(90%) and SC(drafting) (226+/-15 versus 253+/-33 and 249+/-36W). There was no significant correlation between PPO (W) and P(mean) for SC(100%) (r=-0.32), SC(90%) (r=0.65; p=0.058) or SC(drafting) (r=0.54). This study indicates that drafting or swimming at a lower velocity did not induce any conflicting affects on power output during a subsequent cycle TT. However, this study confirms that P(mean) during a cycle TT is reduced when prior swimming is performed. Furthermore the positive relationship typically observed between PPO and P(mean) is disrupted by swimming activity performed before a cycling TT. This factor should be considered in terms of physiological analysis of triathletes.
Mots-clé
Adult, Bicycling/physiology, Biomechanics, Energy Metabolism/physiology, Exercise/physiology, Humans, Lactic Acid/blood, Swimming/physiology, Time Factors
Pubmed
Création de la notice
25/09/2008 8:01
Dernière modification de la notice
20/08/2019 12:28
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