To investigate the usefulness of a simplified Master's two step test (s‐MTT) for preschool children aged 4–6, s‐MTT was carried out in our pediatric cardiology clinic using a new stair and connector for joining the leads from each child to the ECG machine. The subjects were 21 children with Kawasaki disease without coronary involvement and four children with arrhythmias. The treadmill exercise test (TET) was done on the same day to compare the exercise load of s‐MTT with that of TET. Oxygen uptake during s‐MTT was also examined using another group consisting of eight outpatients. There were no differences in indices such as peak heart rate (HR), HR immediately after exercise, and performance ratio between the outpatients in this study and kindergarteners in the preliminary report, The proportions of peak HR and HR immediately after exercise in s‐MTT to those in TET were 91.1 ± 7.9 (mean ± SD)% and 91.1 ± 8.6%, respectively. The average oxygen uptake of the eight outpatients in s‐M'IT was 23.2 ± 4.1 ml/min/kg. These studies suggest that the simplified MTT is useful as a screening test, because it can be done for all children aged 4–6 in any laboratory.
To investigate a simplified Master's two‐step test (MTT) for preschool children aged 4 to 6 years exercise tests with new stairs, with risers 18 cm and 20 cm high, were employed. The subjects were 162 preschool children who were divided into four groups according to the height of the riser and the number of steps taken (60 and 72 steps per 3 minutes).In these tests, the 4‐year‐old children obtained similar mean heart rates immediately after exercise (156.9 to 161.6 BPM) in spite of different exercise tests, and the 5‐ and 6‐year‐old children obtained significantly higher mean heart rates (166.0 and 162.1 BPM, respectively) in the test with a 20 cm riser taking 72 steps. If a single protocol is to be used for children aged 4 to 6, the test with a 20 cm riser and taking 72 steps seems to be the best with reference to the achieved heart rates and performance ratios.
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