Oxygen uptake efficiency slope as a useful measure of cardiorespiratory functional reserve in adult cardiac patients |
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Authors: | Reizo Baba Kazuo Tsuyuki Yasuo Kimura Kenji Ninomiya Masahiko Aihara Kunio Ebine Nobuo Tauchi Kenji Nishibata and Masami Nagashima |
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Institution: | Research Institute of Sports Medical Science Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa, 259-12, Japan. babar@keyaki.cc.u-tokai.ac.jp |
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Abstract: | In this study we aimed to elucidate the validity and usefulness of the oxygen uptake efficiency slope (OUES) in the evaluation of adult cardiac patients. Cardiopulmonary exercise tests were performed on a treadmill by 50 adult patients with chronic heart failure. The OUES was calculated from data for the first 75%, 90%, and 100% of exercise duration. The OUES is derived from the following equation: VO(2)=ax logV(E)+b, where VO(2) is oxygen uptake (ml/kg/min), V(E) is minute ventilation (l/kg/min), and the constant "a" represents OUES. We also determined the ventilatory anaerobic threshold (VAT). The correlation coefficient of the logarithmic curve-fitting model was mean (SD)] 0.986 (0.009). The OUES could be used to discriminate effectively between New York Heart Association functional classes (P < 0.001). OUES and maximum VO(2) were significantly correlated (r=0.78, P < 0.01). Agreement between the OUES values for the first 90%, 75%, and 100% of the exercise was excellent (intraclass correlation coefficient = 0.99). Our results suggest that OUES is applicable to adult cardiac patients as an objective, effort-independent estimation of cardiorespiratory functional reserve. |
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Keywords: | Oxygen uptake efficiency slope Maximal oxygen uptake Anaerobic threshold Exercise testing |
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