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• W1717612309 abstract "To determine whether adjustment of myocardial blood flow (MBF), myocardial oxygen consumption (MVO2) and myocardial substrate uptake (MSU) to acute arterial hypoxia is influenced by training effects on the heart, 7 trained and 7 untrained healthy individuals were investigated. MBF (argon method), MVO2 and MSU of glucose, lactate and free fatty acids were measured at rest during normoxia and two different stages of acute arterial hypoxia: a) 12.82 vol% O2; b) 8.74 vol% O2. Measurements were carried out during hemodynamic and respiratory steady state conditions.Myocardial flow and metabolism of athletes were significantly (p<0.01) lower compared to untrained subjects. In the trained cohort, MBF increased from 65 ± 19 to 73 ± 16 (a) and 98 ± 23 (b) ml/min·100 g. MVO2 remained at normoxic control level of 8.00 ± 2.27 ml/min·100g. In the untrained group, MBF increased from 77 ± 15 to 84 ± 20 (a) and 108 ± 18 (b) ml/min · 100g. Again, there was no significant deviation in MVO2 from the normoxic level of 10.11 ± 1.90 ml/min·100g. Decrease in arterial oxygen content was overcompensated by an increase in coronary conductance resulting in a significantly improved efficiency of myocardial perfusion during severe hypoxia. MSU of glucose, lactate and free fatty acids as well as calculated ATP production did not change significantly during hypoxia.It is concluded that training effects on the heart do not influence regulation of MBF, MVO2 and MSU during moderate or severe acute arterial hypoxia. Reaction of coronary smooth muscle tone to a decrease in oxygen partial pressure is independent from training effects. However, both acute arterial hypoxia and physical training exert synergetic effects on the heart by reducing myocardial oxygen consumption per heart beat. Thus, it is assumed that adaptive properties of myocardial blood flow and metabousm to severe hypoxia are more pronounced in trained than in untrained individuals." @default.
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• W1717612309 date "1978-04-01" @default.
• W1717612309 modified "2023-09-25" @default.
• W1717612309 title "Studies on the regulation of myocardial blood flow in man II. Effects of acute arterial hypoxia" @default.
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• W1717612309 doi "https://doi.org/10.1002/clc.4960010106" @default.
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