Aerobic expenditure during a tennis match

Aim- Measure the oxygen consumption ([image]) during a tennis match and to verify whether the heart rate (HR) measured on the field allows to estimate this [image]. Maximal oxygen consumption and anaerobic threshold were determined in Ten players. Materials and methods- Then each subject played a match for approximately two hours. Ventilatory flow, oxygen and carbon dioxide concentrations and heart rate (HR) were measured continuously and oxygen consumption was determined with a portable telemetric ergospirometry system. A video camera was set simultaneously to film the player. Results- Mean [image] reached approximately 60% of the [image]max for 80% of the duration of the match. During the points, HR varied from 70 to 95% of maxHR and decreased rapidly during the changes of side. The evolution of the [image] was similar. The mean [image] was identical to that estimated from the HR measured in the field and the HR/[image] relationship determined at the laboratory. Conclusion- Despite the intermittent nature of the game, tennis induces a moderate but long aerobic expenditure and the HR measured in the field remains a good indicator of the level of the aerobic expenditure.Original Abstract: Objectifs- Quantifier l'importance de la consommation d'oxygene ([image]) pendant un match de tennis et verifier si la frequence cardiaque (FC) mesuree sur Le terrain reflete Le niveau de ce metabolisme. Methodes- Dix joueurs subissent des tests pour determiner leur [image] maximale ([image]max) et leur seuil lactique 4 mmoL. Puis chacun realise un match qui dure environ deux heures pendant lesquelles un metabographe portable mesure, transmet par telemetrie la FC, Le debit ventilatoire, les concentrations d'oxygene et de dioxyde de carbone dans l'air expire et calcule la [image]. Simultanement une camera video filme les mouvements des joueurs. Resultats- La [image] atteint pres De 60% De la [image]max pendant 80% De la duree Du match. Pendant les points, la FC fluctue De 70 a 95% De la FCmax. Elle diminue rapidement lors des changements De cote ; la [image] suit une evolution strictement parallele. La moyenne De la [image] est identique a celle estimee a partir De la FC mesuree sur Le terrain et De la relation FC/[image] etablie au laboratoire avec, cependant, des fluctuations individuelles. En depit De son caractere intermittant, Le tennis induit une depense aerobie moderee mais prolongee. Conclusion- La FC mesuree sur Le terrain reste un reflet fidele De l'importance De