ISSN:0883-9212    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

The cardiovascular, hemodynamic, and ischemic response patterns associated with three arm-ergometer protocols were assessed to investigate three hypotheses: (1) that test sensitivity would be different for arm-ergometer and treadmill tests; (2) that arm-ergometer protocols employing different cranking speeds but equal work rates (WR) would elicit different ischemic and hemodynamic response patterns; and (3) that different arm-cranking speeds would result in differences in oxygen consumption (&OV0312;O2) at a given rate pressure product. The subjects were nine men with angiographically documented CAD and positive treadmill tests (angina and ST-segment depression equal to two millimeters or greater). Treadmill testing employed the standard Bruce protocol. Arm-ergometer tests employed cranking speeds of 30, 60, and 70 rpm but equal work rate increments. Comparison of the treadmill to the arm-ergometer tests indicated similar peak rate pressure products for the treadmill (209 ± 35), and the 30 (190 ± 33), 60 (195 ± 19) and 70 (188 ± 27) rpm tests. Test sensitivity was similar for the 30 (33%), 60 (33%), and 70 (25%) rpm arm-ergometer tests. However, treadmill test sensitivity was 100 % in these subjects, and was significantly higher than the arm-ergometer test sensitivity P <.05). Peak cardiac output, total peripheral resistance and &OV0312;O2were similar for the three arm-ergometer tests. Peak stroke volume (SV) was significantly higher for the 60 (149 ± 3.6 ml) and 70 (150 ± 6.5 ml) rpm protocols than for the 30 (128 ± 4.4 ml) rpm protocol. Peak work rate was significantly higher for the 60 (58.9 ± 15.4 watts) and 70 (60.5 ± 18.2 watts) rpm tests than for the 30 (51.3 ± 12.3 watts) rpm test (P <.05). The results supported hypotheses 1 and 2 in that test sensitivity was different for arm and treadmill tests and SV was higher (representing a hemodynamic difference) for the faster cranking rates. Despite similar peak RPP and &OV0312;O2for the three arm-ergometer tests, higher work rates were attained as a result of the faster cranking speeds.

ISSN:0883-9212    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

The purpose of this study was to determine the maximal level of ventilation that could be obtained in normal individuals exercising with dead space and to determine whether this level of ventilation is best predicted by a short-term or a sustained measurement of maximum voluntary ventilation (MVV) or by spirometry. Four maximal incremental (50 W/min) cycle exercise tests were performed by each of seven subjects (FEV1/FVC = 82%), in a randomized single blind fashion, with measurement of the volume of expired gas and end-tidal PCO2(PETCO2, mm Hg). Testing was performed at baseline (BL), and with 1L, 2L, and 3L of added dead space (DS) in order to load the respiratory system. Actual ventilatory reserve was defined as the difference between the maximum exercise ventilation (&OV0312;e) at BL and the greatest ventilation at exhaustion elicited with DS loading (&OV0312;eDS-&OV0312;eBL). Each subject also performed a “sprint” 10 second MVV (MVVlOs) and a “sustained” 4 minute MVV (MVV 4m). The actual mean ventilatory reserve for the group was 38 ± 27 L. The mean maximal ventilation during exercise with dead space (&OV0312;eDS = 165 L/min) was closest to the FEV1 ± 35 (160 L/min) while the MVV 10s overestimated (198 L/min) and the MVV 4m (140 L/min) underestimated the &OV0312;eDS. However, when linear regression analysis using the &OV0312;eDS as the dependent variable was performed, the &OV0312;eDS was more closely correlated with the MVV 10s (r = 0.88, S.E.E. = 11.4) than it was with the MVV 4m (r = 0.67, S.E.E. = 17.9) or the FEV1 (r = 0.68, S.E.E. = 17.8). From this study the authors conclude that a sprint MVV maneuver is a better predictor of actual ventilatory capacity at exhaustion than is a sustained MVV maneuver or spirometry.

ISSN:0883-9212    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

Exercise-induced ST depression rarely occurs only in the inferior ECG leads (II,III,AVF), but when it does, it has a very low specificity for coronary artery disease. One cause of nonischemic ST depression in the inferior leads is atrial repolarization. This study describes exercise-induced ST depression due to right atrial hypertrophy in four patients referred for cardiac rehabilitation after cardiac surgery for congenital heart disease.

ISSN:0883-9212    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

This report presents a multicenter study, in which the relation of coronary risk factors to somatic and psychosocial factors was examined in female patients with myocardial infarction. The findings of this study substantiate the assumption that the coronary risk factors hyperlipoproteinemia, smoking, and oral contraception stand in close relation to the life and strain situations of female patients with myocardial infarction. This insight should be included in an individual concept of therapy for women with myocardial infarction, in which the reduction of cardiovascular risk factors should play a major role in rehabilitation and secondary prevention as well as in primary prevention.

ISSN:0883-9212    

出版商:OVID    

年代:1989

数据来源: OVID

ISSN:0883-9212    

出版商:OVID    

年代:1989

数据来源: OVID

ISSN:0883-9212    

出版商:OVID    

年代:1989

数据来源: OVID

ISSN:0883-9212    

出版商:OVID    

年代:1989

数据来源: OVID