摘要:

A chest-mounted left ventricular (LV) nuclear probe (VEST™) for use during arm and leg ergometry is presented, with a discussion of the validity and reproducibility of LV function measures at rest and exercise. During both arm and leg ergometry in trained subjects, transient changes in LV function/volumes were observed. LV ejection fraction and relative end-systolic and end-diastolic volumes were 25 to 30% less with the arms versus the legs, agreeing with data from other studies using conventional techniques. At peak exercise with both limbs, LV ejection fraction and relative LV end-systolic volume increased, followed by immediate postexercise normalization. The effect was greatest with the arms and reflects the effect of high intramuscular and arterial pressures generated during arm cranking, leading to increased LV afterloading. The VESTTMpermits rapid and noninvasive assessment of LV function during arm exercise, avoiding the limitations of other techniques.Key words: arm exercise, radionuclide, chest-mounted probe

ISSN:1066-7814    

DOI:10.1139/h94-038

出版商:NRC Research Press    

年代:1994

数据来源: NRC

摘要:

The accuracy of many microprocessor controlled exercise testing systems has not been established, particularly for testing children. A metabolic cart (Sensormedics S2900Z) was validated against a reference system (Douglas bag) in children. The systems were tested using 10 active, healthy children (age 11.6 ± 2.3 yrs) during physiological steady state at two exercise intensities, submaximal walking and running. Eight children performed a high ventilatory flow (HVF) protocol, running for 11 min. All 10 performed a low ventilatory flow (LVF) protocol, walking for 11 min. In both, gas samples were measured after 6 to 7 and 10 to 11 min into the Douglas bag, and after 8 to 9 min by the test system. There was minimal evidence of bias forat either ventilation rate. Greater variability was noted for FeCO2and. In conclusion, the Sensormedics S2900Z appears to be adequate for testing children.Key words: microprocessor, bias, ventilatory flows

ISSN:1066-7814    

DOI:10.1139/h94-039

出版商:NRC Research Press    

年代:1994

数据来源: NRC

ISSN:1066-7814    

DOI:10.1139/h94-040

出版商:NRC Research Press    

年代:1994

数据来源: NRC

ISSN:1066-7814    

DOI:10.1139/h94-041

出版商:NRC Research Press    

年代:1994

数据来源: NRC