Duration of ST segment depression after exercise-induced myocardial ischemia is influenced by body position during recovery but not by type of exercise.
Am Heart J
; 121(6 Pt 1): 1665-70, 1991 Jun.
Article
em En
| MEDLINE
| ID: mdl-2035381
To assess whether the duration of ischemic ST segment depression after exercise can be modified by changes in body position during recovery or with different types of exercise, 18 patients with chronic stable angina, positive exercise test results, and documented coronary artery disease were prospectively studied. Every patient underwent testing with three different exercise protocols: (1) Bruce (Bruce-standing recovery), (2) abrupt onset of exercise (abrupt), and (3) modified Bruce protocol preceded by a 10-minute warm-up period (warm-up). After exercise test patients recovered in a sitting position. In addition, all patients performed a fourth exercise (Bruce protocol), but this time they recovered in the supine position (Bruce-supine recovery). Time and heart rate-blood pressure product at 1 mm ST segment depression were similar for Bruce-standing recovery, abrupt, and Bruce-supine recovery protocols (5.1 +/- 2, 4.4 +/- 2, and 5.2 +/- 2 minutes and 20.8 +/- 4, 21.3 +/- 4, and 20.4 +/- 4 beats/min x mm Hg x 10(-3), respectively. Heart rate and heart rate-blood pressure product at peak exercise did not differ in Bruce-standing recovery, abrupt, and Bruce-supine recovery. Maximal ST segment depression was -2.0, -1.9, and -2.0 mm with Bruce-standing recovery, abrupt, and Bruce-supine recovery exercise, respectively, and -1.5 mm with warm-up exercise (p less than 0.05). Duration of ST segment depression into recovery was significantly prolonged after Bruce-supine recovery exercise (9.4 + 5 minutes) compared with Bruce-standing recovery, abrupt, and warm-up protocols (6.8 + 3, 5.9 + 4, and 5.0 + 3 minutes, respectively; p less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Postura
/
Exercício Físico
/
Doença das Coronárias
/
Eletrocardiografia
Tipo de estudo:
Clinical_trials
/
Diagnostic_studies
Limite:
Adult
/
Aged
/
Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Ano de publicação:
1991
Tipo de documento:
Article