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Effects of progressive exercise during phase I cardiac rehabilitation on the heart rate variability of patients with acute myocardial infarction.
MedLine Citation:
PMID:  20809873     Owner:  NLM     Status:  In-Data-Review    
Purpose. Heart rate variability (HRV) decreases after an acute myocardial infarction (AMI) due to changes in cardiac autonomic balance. The purpose of the present study, therefore, was to evaluate the effects of a progressive exercise protocol used in phase I cardiac rehabilitation on the HRV of patients with post-AMI. Material and methods. Thirty-seven patients who had been admitted to hospital with their first non-complicated AMI were studied. The treated group (TG, n = 21, age = 52 ± 12 years) performed a 5-day programme of progressive exercise during phase I cardiac rehabilitation, while the control group (CG, n = 16, age = 54 ± 11 years) performed only respiratory exercises. Instantaneous heart rate (HR) and RR interval were acquired by a HR monitor (Polar®S810i). HRV was analysed by frequency domain methods. Power spectral density was expressed as normalised units (nu) at low (LF) and high (HF) frequencies, and as LF/HF. Results. After 5 days of progressive exercise, the TG showed an increase in HFnu (35.9 ± 19.5 to 65.19 ± 25.4) and a decrease in LFnu and LF/HF (58.9 ± 21.4 to 32.5 ± 24.1; 3.12 ± 4.0 to 1.0 ± 1.5, respectively) in the resting position (p < 0.05). No changes were observed in the CG. Conclusions. A progressive physiotherapeutic exercise programme carried out during phase I cardiac rehabilitation, as supplement to clinical treatment increased vagal and decreased sympathetic cardiac modulation in patients with post-AMI.
Michele D B Santos-Hiss; Ruth C Melo; Victor R Neves; Flávio C Hiss; Roberto M M Verzola; Ester Silva; Audrey Borghi-Silva; Alberto Porta; Nicola Montano; Aparecida Maria Catai
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Publication Detail:
Type:  Journal Article     Date:  2010-09-02
Journal Detail:
Title:  Disability and rehabilitation     Volume:  33     ISSN:  1464-5165     ISO Abbreviation:  Disabil Rehabil     Publication Date:  2011  
Date Detail:
Created Date:  2011-03-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9207179     Medline TA:  Disabil Rehabil     Country:  England    
Other Details:
Languages:  eng     Pagination:  835-42     Citation Subset:  IM    
Department of Physiotherapy, Federal University of São Carlos, São Carlos, SP, Brazil.
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