THE IMPACT OF SHORT TERM SUPERVISED AND HOME-BASED WALKING PROGRAMMES
ON HEART RATE VARIABILITY IN PATIENTS WITH PERIPHERAL ARTERIAL DISEASE
Lynette D. Hodges2, Saroj K. Das3 and David A. Brodie4
1Centre for Sports and Exercise Science, School of Biological Sciences,
University of Essex Wivenhoe Park, Colchester, Essex, UK, 2Division of
Sport and Exercise Science, University of Bedfordshire, Luton Campus, Luton,
Bedfordshire, UK, 3Hillingdon Hospital NHS Trust, Pield Heath Road, Uxbridge,
Middlesex, UK, 4Research Centre for Health Studies, Buckinghamshire Chilterns
University College, Newlands Park, Gorelands Lane, Chalfont St.Giles, Buckinghamshire,
05 July 2007
Journal of Sports Science and Medicine (2007) 6, 471- 476
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|The aims of the study were to determine whether heart rate variability
(HRV) measured at rest and during exercise could be altered by an
exercise training programme designed to increase walking performance
in patients with peripheral arterial disease. Forty-four volunteers
were randomised into 12 weeks of either: supervised walking training
twice weekly for 30 min at 75% VO2peak (SU), home-based
walking training sessions: twice weekly, 30 min per week (HB) or no
exercise (CT). HRV measures were calculated from a 5-min resting ECG.
Each patient then underwent maximal, graded exercise treadmill testing.
All measures were repeated after 12 weeks. The SU group showed significantly
(p < 0.001) increased maximal walking time (MWT) but no change
in VO2peak. There were no statistically significant changes
in any of the measures of HRV in any group. Effect sizes for change
in HRV measures were all very small and in some cases negative. Improved
walking performance was not accompanied by central cardiorespiratory
or neuroregulatory adaptations in the present study. The lack of any
change in HRV was possibly due to either the low intensity or discontinuous
nature of exercise undertaken.
ischemia, autonomic nervous system.