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Thai) 1:
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The Vitalog continuously measures heart rate byEKG and activity with a group of mercury switchesplaced on the upper thigh. The Vitalog was individuallycalibrated for each patient during the entrymaximal treadmill test. Each patient's threshold foractivity was the heart rate by EKG and the number ofcounts registered by the motion sensor when the patient was walking on the treadmill at 2 mph, 0%grade. Data were analyzed as the number andduration of bouts of activity (defined as any period ofactivity above the individual threshold). Values arealso expressed as the number of minutes active perhour and the percent of time active during the courseof the monitored session.
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