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• W2034624141 abstract "Dans le but de comparer la valeur prédictive du seuil anaérobie (SA) et de la consommation maximale d'oxygène (V˙O2 max) sur la performance en course à pied, et de vérifier les effets de l'âge sur ces différents paramètres, une étude a été réalisée sur 3 populations différant par l'âge et le niveau d'entraînement. Une population de sujets jeunes (âge moyen 25,4±4,8 ans) et deux populations de sujets plus âgés (âge moyen 43,7±4,5 ans et 42,3±4,9 ans) ont effectué une épreuve d'effort maximale triangulaire sur tapis roulant; le recueil des paramètres respiratoires et la mesure du lactate sanguin ont permis de déterminer le seuil anaérobie lactique (SAL), le seuil anaérobie ventilatoire (SAV) et la consommation maximale d'O2 (V˙O2 max). L'ensemble de ces sujets sportifs entraînés ont participé à des épreuves de course à pied, peu de temps avant ou après les déterminations en laboratoire. Les performances réalisées furent corrélées avec les paramètres physiologiques (SA et V˙O2 max). Les résultats obtenus montrent que la valeur prédictive du SA augmente avec la distance des compétitions, pour être identique à V˙O2 max sur le marathon. La valuer prédictive de la performance du SA augmente avec l'âge des sujets. The purpose of the study was to examine the relationship of running performance time with maximal aerobic power (V˙O2 max), anaerobic threshold (AT), and age of the subject. Three groups of male subjects differing in age and training were studied. The first group was composed of young subjects (mean age ± SD=25.4±4.8 years), and the others were made up of two populations of older subjects differing in training., with mean ages of 43.7±4.5 and 42.3±4.9 years. All subjects performed a progressive and maximal treadmill test; the respiratory parameters and blood lactate level were recorded at each step of the test in order to determine maximal oxygen consumption (V˙O2 max) and anaerobic threshold (AT). The anaerobic threshold was fixed at a work load between ventilatory threshold (VAT) and lactate threshold (LAT). The mean data obtained from the overall population show that ventilatory threshold is delayed slightly after lactate threshold, so that one could define a transitional zone between these two values. The mean V˙O2 max value obtained for the young group was higher (61.3±6 ml/min-kg) than for the two oder populations (54.6±5 ml/min-kg for the most trained group, and 49.5±3.7 ml/min-kg for the other). Conversely the mean AT, expressed as percentage of V˙O2 max, was greater in the most trained older group than in the young group (82.6±6% vs.− 74.8±5.08%). The performance time of all subjects in running competitions ranging from cross-country to the marathon were recorded in conjunction with the laboratory evaluations in order to perform a multiple linear regression analysis with V˙O2 max, AT and age. For the young population the best correlation of performance times for all distance running was obtained with V˙O2 max. The predictive value of AT was enhanced with an increase, in the distance run, for this parameter became almost similar on marathon running (r=0.77 V˙O2 max ml/min.kg.marathon time, r=0.76 V˙O2 l/min at AT.marathon time). On the other hand, the AT, expressed as V˙O2 became a better predictive factor in the two older populations (r=8.85 AT l/min marathon time; r=0.68 V˙O2 ml/min.kg marathon time). Since the mean performance times for marathon running for young and old subjects were almost similar (181.42 ±30 min vs. 185.40±13.6 min), the following hypothesis is put forward: the decrease in V˙O2 max in older subjects could be counterbalanced by an increase in the percent of V˙O2 max at the AT. These changes could be the result of an increase in the area of slow-twitch muscle fibers brought about by ageing, since AT has been shown to be related to an increased percentage of slow-twitch fibers." @default.
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• W2034624141 date "1986-01-01" @default.
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• W2034624141 title "Etude de l'évolution de la valeur prédictive du seuil anaérobie sur la performance en fonction de l'âge" @default.
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• W2034624141 doi "https://doi.org/10.1016/s0765-1597(86)80071-5" @default.
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