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A study on echocardiographic evaluation of left ventricular performance during supine bicycle ergometer exercise 1. a comparison of the responses to exercise by age and sex of normal children



A study on echocardiographic evaluation of left ventricular performance during supine bicycle ergometer exercise 1. a comparison of the responses to exercise by age and sex of normal children



Tokyo Jikeikai Medical Journal 103(3): 639-650



Using M-mode Echocardiography, left ventricular performance during supine bicycle ergometer exercise was evaluated in 66 healthy children aged 6 to 17 years. Group I whose body surface area was less than 1.0 m2 consisted of 10 body with a mean age of 8.45 .+-. 1.78 years and 9 girls with a mean age of 7.67 .+-. 1.70 years. Group II whose body surface area was 1.0 to 1.5 m2 consisted of 10 boys with a mean age of 11.4 .+-. 1.30 years and 9 girls with a mean age of 10.7 .+-. 1.90 years. Group III whose body surface area was more than 1.5 m2 consisted of 19 boys with a mean age of 15.2 .+-. 0.8 years and 9 girls with a mean age of 15.3 .+-. 5.70 years. In Group I (boys), the heart rate at rest was significantly greater than Group III (boys). In Group I, the systolic blood pressure (SBP) at maximal exercise was significantly smaller than Group II and Group III. Heart rate and SBP during exercise increased in all three groups. In Group III (boys), the percent changes from resting values in SBP were significantly greater than Group I (boys), and Group III (girls) at 40%, 60%, and 80% exercise volumes of maximal exercise. Left ventricular end diastolic dimension and left atrial dimension remained during exercise in each group. The percent changes from resting values in left ventricular end systolic dimension, left ventricular ejection fraction (LVEF), and mean velocity of circumferential fiber shortening (mVcf) during exercise were changed until 40%, 50%, and 60% exercise volumes of maximal volume, and were unchanged at more than exercise volumes. In Group I (boys), the percent changes from resting values in LVEF during exercise were greater than Group III (boys) at 40%, 50%, and 90% exercise volumes of maximal volume. In Group I (boys), the percent changes from resting values in mVcf during exercise were significantly greater than Group II (boys) and Group III (boys). In the boys of Group II and Group III, the maximal endurance index was significantly greater than the girls of each group. It is concluded that the responses of left ventricular performance during supine bicycle ergometer exercise differ by age and sex of healthy children.

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