التفاصيل البيبلوغرافية
| العنوان: |
Assessing Maximal Exercise Capacity: Peak Work or Peak Oxygen Consumption? |
| المؤلفون: |
Kaminsky, David A., Knyazhitskiy, Alexey, Sadeghi, Ali, Irvin, Charles G. |
| المصدر: |
Respiratory Care; Jan2014, Vol. 59 Issue 1, p90-96, 7p |
| مصطلحات موضوعية: |
ANALYSIS of variance, CARDIOPULMONARY system, CONFIDENCE intervals, EPIDEMIOLOGY, EXERCISE tests, HEART beat, STATISTICS, LOGISTIC regression analysis, DATA analysis, ANAEROBIC threshold, BODY mass index, OXYGEN consumption, VITAL capacity (Respiration), RETROSPECTIVE studies, DATA analysis software, DESCRIPTIVE statistics, EXERCISE tolerance |
| مصطلحات جغرافية: |
VERMONT |
| مستخلص: |
BACKGROUND: Exercise capacity assessed by cardiopulmonary exercise testing is usually measured by peak oxygen consumption (V̇O2 ). However, not uncommonly, patients achieve a relatively higher work load (peak work) compared to their peak V̇O2 . In these situations it is difficult to know which parameter to use in assessing exercise capacity. The purpose of this study was to determine whether there are distinguishing physiological characteristics of patients with discordance between percent-of-predicted peak work versus peak V̇O2 , in order to understand how to use these measurements in interpreting exercise capacity. METHODS: We conducted a retrospective study of 172 cardiopulmonary exercise tests performed at our institution between 2003 and 2010. RESULTS: The subjects in the higher peak work group demonstrated higher ventilatory efficiency (lower slope of minute ventilation to carbon dioxide production) and lung function (FEV1 and FVC), a greater breathing reserve (higher breathing reserve, lower V̇E/maximal voluntary ventilation), and achieved a higher maximal heart rate. Subjects in the higher maximum V̇O2 group were heavier, had lower ventilatory efficiency, and had a reduced breathing reserve. Multivariate logistic regression analysis showed that the predominant independent factors associated with group assignment were body mass index, breathing reserve, and peak heart rate. The subjects with higher percent-of-predicted peak work than peak V̇O2 had a lower body mass index, a greater breathing reserve, and a higher peak heart rate. CONCLUSIONS: The observation that there are distinguishing physiological features between those who have a higher peak work and those who have higher peak V̇O2 provides insight into the underlying processes determining maximal exercise capacity. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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