Maximal and submaximal aerobic fitness in postmenopausal women: influence of hormone-replacement therapy

Authors: Kowalchuk, John M.; Petrella, Robert J.; Paterson, Donald H.; Stathokostas, Liza

Source: Applied Physiology, Nutrition, and Metabolism, Volume 33, Number 5, October 2008 , pp. 922-928(7)

Publisher: NRC Research Press

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Abstract:

The purpose of this study was to examine whether maximal and submaximal aerobic fitness parameters (peak oxygen consumption and ventilatory threshold, respectively) are affected by hormone-replacement therapy (HRT) in moderately active postmenopausal women. Forty healthy, active, postmenopausal women (21 taking HRT, mean age 62 ± 5 years; 19 not taking HRT, mean age 62 ± 7 years) met the peak oxygen consumption criteria during a cycle ergometer test (15 W ramp) and achieved volitional fatigue. Breath-by-breath measurement was used to determine peak oxygen consumption and to estimate ventilatory threshold. There were no differences in characteristics (age, body mass, height, body mass index, leisure-time physical activity) between the non-HRT and HRT groups, nor were there any differences in responses to maximal exercise, with an observed peak oxygen consumption (mL·kg-1·min-1) of 22.9 ± 3.8 in the non-HRT group and 22.0 ± 4.7 in the HRT group. There was also no difference in submaximal aerobic capacity, with ventilatory threshold values (mL·kg-1·min-1) of 16.7 ± 3.4 in the non-HRT group and 15.6 ± 3.2 in the HRT group. In a sample of healthy moderately active postmenopausal women, there was no difference in maximal or submaximal aerobic fitness parameters beteen the HRT and non-HRT groups.

Le but de cette étude est de vérifier si les valeurs des paramètres de la condition physique au cours d'un effort aérobie maximal (consommation d'oxygen maximale) et sous-maximal (TVE) sont modifiées par l'hormonothérapie substitutive (HRT) utilisée par des femmes postménopausées modérément actives. Quarante femmes postménopausées en bonne santé et physiquement actives (19 sans HRT, âge moyen de 62 ± 7 ans et 21 avec HRT, âge moyen de 62 ± 5 ans) participent jusqu'à l'épuisement volontaire à une épreuve d'effort par paliers de 15 W sur un ergocycle pour la détermination du consommation d'oxygen maximale. L'analyse des gaz expirés à chaque respiration détermine l'atteinte du consommation d'oxygen maximale et l'estimation du TVE. En termes de caractéristiques descriptives (âge, masse corporelle, stature, index de masse de corps, temps de loisir consacré à l'activité physique), les sujets des 2 groupes (sans HRT et avec HRT) ne diffèrent pas. On n'observe pas de différences de consommation d'oxygen maximale (mL·kg-1·min-1) au cours de l'effort maximal : sans HRT, 22,9 ± 3,8 et avec HRT, 22,0 ± 4,7. Au cours de l'effort sous-maximal, les valeurs de TVE ne diffèrent pas d'un groupe à l'autre : sans HRT, 16,7 ± 3,4 mL·kg-1·min-1 et avec HRT, 15,6 ± 3,2 mL·kg-1·min-1. Dans un échantillon de femmes postménopausées en bonne santé et modérément actives divisées en 2 groupes selon qu'elles utilisent ou non l'hormonothérapie substitutive, on n'observe pas de différences au plan des valeurs des variables de la condition physique au cours d'un effort sous-maximal et maximal.

Document Type: Research article

Publication date: 2008-10-01

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  • This bimonthly journal has a 30-year history of publishing, first as the Canadian Journal of Sport Sciences, and later as the Canadian Journal of Applied Physiology. It publishes original research articles, reviews, and commentaries, focussing on the application of physiology, nutrition, and metabolism to the study of human health, physical activity, and fitness. The published research, reviews, and symposia will be of interest to exercise physiologists, physical fitness and exercise rehabilitation specialists, public health and health care professionals, as well as basic and applied physiologists, nutritionists, and biochemists.
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