Cardiorespiratory efficiency at submaximal work in young and middle-aged women
| Autor: | Morris Notelovitz, Christian W. Zauner, Robert B. Vogel, Kevin M. Clair, Carol Fields, William J. Clair |
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| Rok vydání: | 1984 |
| Předmět: |
Adult
Aging medicine.medical_specialty Physical Exertion Oxygen Consumption Heart Rate Internal medicine Heart rate medicine Work Intensity Humans Treadmill business.industry Respiration Work (physics) Hemodynamics Obstetrics and Gynecology VO2 max Cardiorespiratory fitness Middle Aged Intensity (physics) Cardiology Physical therapy Female medicine.symptom business Weight gain |
| Zdroj: | American Journal of Obstetrics and Gynecology. 150:712-715 |
| ISSN: | 0002-9378 |
| DOI: | 10.1016/0002-9378(84)90673-2 |
| Popis: | Seventeen middle-aged women and 26 younger women were studied while walking at 3 mph and a 5% grade on a motorized treadmill. This was submaximal work for all subjects and is equivalent to the intensity of everyday activity. The middle-aged women had a significantly greater oxygen uptake, ventilatory equivalent, and heart rate, suggesting a relative cardiorespiratory inefficiency at this submaximal work intensity. This phenomenon is most likely a function of body size, however, since dividing the submaximal oxygen uptake by body weight rendered the mean difference between the two groups statistically insignificant. The age-associated reduction in cardiorespiratory efficiency at submaximal exercise is thus due primarily to weight gain rather than to actual systems degeneration. Maximal oxygen uptake, that associated with maximal physical effort, was significantly reduced in the older subjects, and this is probably due to a combination of previous life-style habits and aging. |
| Databáze: | OpenAIRE |
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