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Titolo:
SHORT AND LONG-TERM EFFECTS OF EXERCISE TRAINING ON THE TONIC AUTONOMIC MODULATION OF HEART-RATE-VARIABILITY AFTER MYOCARDIAL-INFARCTION
Autore:
MALFATTO G; FACCHINI M; BRAGATO R; BRANZI G; SALA L; LEONETTI G;
Indirizzi:
IRCCS,CTR AUXOL ITALIANO,IST SCI OSPED SAN LUCA,DIV RIABILITAZ CARDIOL,VIA SPAGNOLETTO 3 I-20147 MILAN ITALY UNIV MILAN,IST CLIN MED & TERAPIA MED MILAN ITALY
Titolo Testata:
European heart journal
fascicolo: 4, volume: 17, anno: 1996,
pagine: 532 - 538
SICI:
0195-668X(1996)17:4<532:SALEOE>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUDDEN CARDIAC DEATH; BAROREFLEX SENSITIVITY; PERIOD VARIABILITY; FREQUENCY-DOMAIN; NERVOUS-SYSTEM; MORTALITY; REHABILITATION; TRIALS;
Keywords:
MYOCARDIAL INFARCTION; CARDIAC REHABILITATION; EXERCISE TRAINING; AUTONOMIC NERVOUS SYSTEM; HEART RATE VARIABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
G. Malfatto et al., "SHORT AND LONG-TERM EFFECTS OF EXERCISE TRAINING ON THE TONIC AUTONOMIC MODULATION OF HEART-RATE-VARIABILITY AFTER MYOCARDIAL-INFARCTION", European heart journal, 17(4), 1996, pp. 532-538

Abstract

We studied the effects of cardiac rehabilitation on the sympathovagalcontrol of heart rate variability in 30 patients after a first, uncomplicated myocardial infarction. Twenty-two patients completed 8 weeks of endurance training (trained), while eight decided not to engage in the rehabilitation programme for logistical reasons, and were taken asuntrained controls. Age, site of infarction, ejection fraction, ventricular diameter and stress test duration were similar in the two groups at baseline. Heart rate variability was evaluated 4 weeks after infarction before starring rehabilitation, and repeated 8 weeks and one year later in both trained and untrained patients. Measures of heart rate variability, obtained from both time- and frequency-domain analysis of a lj min ECC recording in resting conditions, were as follows: meanRR interval and its standard deviation (RRSD), the mean square successive differences (MSSD), the percent of RR intervals differing >50 ms from the preceding RR (pNN50), the low and high frequency components of the autoregressive power spectrum of the RR intervals and their ratio (LF/HF). At baseline, heart rate variability was similar in trained and untrained patients. In the short term (8 weeks after infarction), training increased RRSD by 25% (P<0.01), MSSD by 69% (P<0.01), pNN50 by 120% (P<0.01), and reduced LF/HF ratio by 30% (P<0.01). The effects persisted after one year in trained patients. In untrained patients, the autonomic control of heart rate variability did not change 8 weeks after myocardial infarction and was only slightly modified by time. Thus, exercise training, performed for 8 weeks after a myocardial infarction, modifies the sympathovagal control of heart rate variability toward a persistent increase in parasympathetic tone, known to be associated with a better prognosis. This may partly account for the favourable outcome of patients who undergo rehabilitation.

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Documento generato il 29/03/20 alle ore 01:53:48