Personalised relaxation practice to improve sleep quality in patients with chronic fatigue syndrome and depression: A Randomised Control Trial

Debilitating fatigue; unrefreshing sleep and poor daytime functioning are core features of many neuropsychiatric conditions including chronic fatigue syndrome (CFS) and major depression. Understanding of the aetiologies of these conditions is still incomplete and symptom management strategies have only limited efficacy. Accumulating evidence suggests that abnormalities in the function of the autonomic nervous system play a role in the sleep disturbance and chronic fatigue in these conditions. In particular, autonomic activity is characterized by neural hyper-vigilance and a marked loss of parasympathetic, vagus nerve activity that persist even during sleep. Measures of beat-to-beat heart rate variability (HRV) provide well-established, reliable indices of autonomic functioning, which consistently correlate with the severity and outcome of a spectrum of fatiguing disorders, including autoimmune and cardiovascular disease, chronic pain, depression, and CFS . For example, low HRV was repeatedly found to be a strong correlate of unrefreshing sleep, daytime fatigue and cognitive impairment in CFS. Mindfulness-based stress reduction and relaxation methods are increasingly utilised with the aim to restore autonomic balance. It is believed that the beneficial effects of these approaches are mediated via their impact on neural circuits involved in self-regulation, and on key stress-response pathways. However, individuals can have very different responses to different relaxations methods; and recent analyses revealed that some patients do not respond optimally to some. The main of the current study is to conduct a randomized control trial (RCT) to determine the efficacy and specific benefits of a 4 week personalised relaxation intervention, pre-tested to optimise the individuals' own HRV. Subjective health outcomes and parasympathetic autonomic activity (indexed by HRV) in patients with CFS and depression will be compared to a ‘monitoring only’ control condition. We anticipate that daily practice of a personalised relaxation method before sleep will be substantively more effective in improving sleep quality, daytime fatigue and functioning in both patient groups compared to treatment as usual with symptom monitoring. We further anticipate that restoration of HRV will contribute to positive health outcomes. The findings from this research will facilitate a better understanding of the pathophysiological mechanisms operating in chronic fatigue conditions.