Physical Activity in Haemodialysis Patients: a Feasibility Study

There is a well established link between physical inactivity and increased mortality in the general population and patients with chronic kidney disease (CKD) have low fitness levels when compared to their healthy counterparts (50% of expected norm when commencing dialysis therapy). Trials have shown that physical activity confers many physical and mental health benefits in this patient population, with improvements in fitness, walking capacity, health of the heart and quality of life; indeed, national guidelines now consider physical activity to be a cornerstone of disease management (Cochrane Collaboration 2006; Workgroup KD 2005). CKD patients have lower levels of physical activity than age-matched controls; this is particularly marked for older patients and those on dialysis. The Department of Health recommends ≥150 mins/ week of moderate intensity PA (accumulated in bouts of at least 10 minutes) for the general population (DoH UK Physical Activity Guidelines 2011). Many studies have sought to characterise the most effective forms of exercise for CKD patients. Recent attention has focussed on intradialytic cycling, with studies showing benefits not only for fitness and endurance but also muscle strength, power, and physical function. However, translating research guided physical activity programmes into routine clinical practice is challenging, requiring consideration of patients' physical and psychological barriers to exercise.

Assessing the impact of any activity programme requires comparison of health and exercise behaviours pre and post intervention. Several self-report physical activity questionnaires are available but the Human Activity Profile has been validated in CKD patients (Johansen et al. 2001). However, information obtained from patient self-reporting is subjective and prone to bias. Objective measurement devices such as accelerometers are more accurate.

Feasibility of an effective intervention to increase physical activity requires understanding of perceptions of exercise in the population of interest. In this way, the intervention can be specifically targeted to take account of perceived benefits and barriers towards physical activity and thereby increase compliance. This study will provide: 1)feasibility and acceptability of an instructor led chair based exercise programme and educational package (booklet); 2) both self-report and objective measurements of physical activity levels in a sample of haemodialysis patients. This key information will later be used to assess whether a informed large scale PA intervention study in haemodialysis patients is feasible.

Inclusion criteria

• • Participant is willing and able to give informed consent for participation in the trial.

• Male or Female, aged 18 years or above.
• Undergoing regular haemodialysis (2 or 3 times per week) in the Oxford Main and Tarver Dialysis Units
• Is able and willing to comply with all trial requirements.
• Willing to allow his or her General Practitioner and consultant, if appropriate, to be notified of participation in the trial.

Exclusion criteria

• Unable to give consent
• Poor dialysis compliance
• Female participant who is pregnant, lactating or planning pregnancy during the course of the trial.
• Participant with life expectancy of less than 1 month and/or receiving palliative care.
• Any other significant disease or disorder which, in the opinion of the Investigator, may either put the participants at risk because of participation in the trial, or may influence the result of the trial, or the participant's ability to participate in the trial.
• Planning to leave Oxford Dialysis units within the study trial
• Absolute contra-indications to PA including:

• Recent significant change in resting ECG suggesting significant ischaemia, recent Myocardial Infarction within 2 days or acute cardiac event
• Unstable angina
• Uncontrolled cardiac arrhythmia causing symptoms or haemodynamic compromise
• Symptomatic severe aortic stenosis
• Uncontrolled symptomatic heart failure
• Acute pulmonary embolus or infarction
• Acute myocarditis or pericarditis
• Third degree heart block
• Suspected or know dissecting aortic aneurysm
• Acute systemic infection, accompanied by fever, body aches or swollen lymph glands