caa a22 4500 463157737 CHVBK 20180406164739.0 cr unu---uuuuu 170326e20070201xx s 000 0 eng 10.1007/s10286-007-0392-5 doi (NATIONALLICENCE)springer-10.1007/s10286-007-0392-5 Changes in short-term measures of heart rate variability after eight weeks of cardiac rehabilitation [Elektronische Daten] [Gavin Sandercock, Richard Grocott-Mason, David Brodie] Background: In coronary artery disease (CAD) and following myocardial infarction (MI), activity of the autonomic nervous system is altered. Reduced heart rate variability (HRV) is a risk factor for future cardiac event. Studies reporting changes in HRV post-cardiac rehabilitation (CR) are heterogeneous, due possibly to varied data collection and analysis protocols. Aim: To evaluate changes in spectral measures of HRV derived from 5-minute ECG recordings in patients completing an 8weeks CR programme. Methods: Thirty-eight patients (21 males, 17 females, aged 65.6±11.6years) underwent 5minutes, supine ECG recordings and standard physiological and psychological assessment pre- and post-CR. A further 23 patients (14 males, 9 females aged 64.9±9years) acted as controls. Outcome measures were: low frequency power, (LF, 0.04-0.15Hz) high frequency power (HF, 0.15-0.40Hz), LF:HF ratio and mean RR interval. Change was assessed by ANCOVA and paired t-tests. Results: When compared with the CT group, the CR group showed significant increases in: SDNN (Δ +6ms, CR vs. 0ms CT), HFln (Δ 0.4 log units CR vs. 0 log units CT), LFln (Δ +0.6 log units CR, vs. +0.1 log units CT) and RR interval (Δ +30ms, CR vs. −28ms CT). Conclusions: This is the first study to show significant increases in raw LF and HF power derived from short-term ECG recordings in CR patients. These measures are risk factors for future cardiac event. As CR is associated with increases in these measures it may be viewed as an effective therapy capable of bringing about favourable alterations in autonomic control. Steinkopff Verlag Darmstadt, 2007 autonomic nervous system nationallicence aerobic fitness nationallicence heart rate variability nationallicence spectral analysis nationallicence myocardial infarction nationallicence rehabilitation nationallicence Sandercock Gavin Centre for Sports and Exercise Science, School of Biological Sciences, University of Essex, Wivenhoe Park, CO4 3SQ, Colchester, UK aut Grocott-Mason Richard Hillingdon Hospital NHS Trust, Uxbridge, UK aut Brodie David Research Centre for Health Studies, Buckinghamshire Chilterns University College, Chalfont St. Giles, UK aut Clinical Autonomic Research Steinkopff-Verlag; www.steinkopff.springer.de 17/1(2007-02-01), 39-45 0959-9851 17:1<39 2007 17 10286 https://doi.org/10.1007/s10286-007-0392-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10286-007-0392-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sandercock Gavin Centre for Sports and Exercise Science, School of Biological Sciences, University of Essex, Wivenhoe Park, CO4 3SQ, Colchester, UK aut NATIONALLICENCE 700 1- Grocott-Mason Richard Hillingdon Hospital NHS Trust, Uxbridge, UK aut NATIONALLICENCE 700 1- Brodie David Research Centre for Health Studies, Buckinghamshire Chilterns University College, Chalfont St. Giles, UK aut NATIONALLICENCE 773 0- Clinical Autonomic Research Steinkopff-Verlag; www.steinkopff.springer.de 17/1(2007-02-01), 39-45 0959-9851 17:1<39 2007 17 10286 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer