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Lacourt TE, Vichaya EG, Chiu GS, Dantzer R, Heijnen CJ. The High Costs of Low-Grade Inflammation: Persistent Fatigue as a Consequence of Reduced Cellular-Energy Availability and Non-adaptive Energy Expenditure. Front Behav Neurosci 2018; 12:78. [PMID: 29755330 PMCID: PMC5932180 DOI: 10.3389/fnbeh.2018.00078] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 04/09/2018] [Indexed: 02/03/2023] Open
Abstract
Chronic or persistent fatigue is a common, debilitating symptom of several diseases. Persistent fatigue has been associated with low-grade inflammation in several models of fatigue, including cancer-related fatigue and chronic fatigue syndrome. However, it is unclear how low-grade inflammation leads to the experience of fatigue. We here propose a model of an imbalance in energy availability and energy expenditure as a consequence of low-grade inflammation. In this narrative review, we discuss how chronic low-grade inflammation can lead to reduced cellular-energy availability. Low-grade inflammation induces a metabolic switch from energy-efficient oxidative phosphorylation to fast-acting, but less efficient, aerobic glycolytic energy production; increases reactive oxygen species; and reduces insulin sensitivity. These effects result in reduced glucose availability and, thereby, reduced cellular energy. In addition, emerging evidence suggests that chronic low-grade inflammation is associated with increased willingness to exert effort under specific circumstances. Circadian-rhythm changes and sleep disturbances might mediate the effects of inflammation on cellular-energy availability and non-adaptive energy expenditure. In the second part of the review, we present evidence for these metabolic pathways in models of persistent fatigue, focusing on chronic fatigue syndrome and cancer-related fatigue. Most evidence for reduced cellular-energy availability in relation to fatigue comes from studies on chronic fatigue syndrome. While the mechanistic evidence from the cancer-related fatigue literature is still limited, the sparse results point to reduced cellular-energy availability as well. There is also mounting evidence that behavioral-energy expenditure exceeds the reduced cellular-energy availability in patients with persistent fatigue. This suggests that an inability to adjust energy expenditure to available resources might be one mechanism underlying persistent fatigue.
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Monro JA, Puri BK. A Molecular Neurobiological Approach to Understanding the Aetiology of Chronic Fatigue Syndrome (Myalgic Encephalomyelitis or Systemic Exertion Intolerance Disease) with Treatment Implications. Mol Neurobiol 2018; 55:7377-7388. [PMID: 29411266 PMCID: PMC6096969 DOI: 10.1007/s12035-018-0928-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Accepted: 01/24/2018] [Indexed: 12/11/2022]
Abstract
Currently, a psychologically based model is widely held to be the basis for the aetiology and treatment of chronic fatigue syndrome (CFS)/myalgic encephalomyelitis (ME)/systemic exertion intolerance disease (SEID). However, an alternative, molecular neurobiological approach is possible and in this paper evidence demonstrating a biological aetiology for CFS/ME/SEID is adduced from a study of the history of the disease and a consideration of the role of the following in this disease: nitric oxide and peroxynitrite, oxidative and nitrosative stress, the blood–brain barrier and intestinal permeability, cytokines and infections, metabolism, structural and chemical brain changes, neurophysiological changes and calcium ion mobilisation. Evidence is also detailed for biologically based potential therapeutic options, including: nutritional supplementation, for example in order to downregulate the nitric oxide-peroxynitrite cycle to prevent its perpetuation; antiviral therapy; and monoclonal antibody treatment. It is concluded that there is strong evidence of a molecular neurobiological aetiology, and so it is suggested that biologically based therapeutic interventions should constitute a focus for future research into CFS/ME/SEID.
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Affiliation(s)
- Jean A Monro
- Breakspear Medical Group, Hemel Hempstead, England, UK
| | - Basant K Puri
- Department of Medicine, Imperial College London, Hammersmith Hospital, London, UK.
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Collin SM, Norris T, Gringras P, Blair PS, Tilling K, Crawley E. Childhood sleep and adolescent chronic fatigue syndrome (CFS/ME): evidence of associations in a UK birth cohort. Sleep Med 2018; 46:26-36. [PMID: 29773208 PMCID: PMC5974860 DOI: 10.1016/j.sleep.2018.01.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 01/06/2018] [Accepted: 01/08/2018] [Indexed: 01/19/2023]
Abstract
OBJECTIVE/BACKGROUND Sleep abnormalities are characteristic of chronic fatigue syndrome (CFS, also known as 'ME'), however it is unknown whether sleep might be a causal risk factor for CFS/ME. PATIENTS/METHODS We analysed data from the Avon Longitudinal Study of Parents and Children (ALSPAC) birth cohort. We describe sleep patterns of children aged 6 months to 11 years, who were subsequently classified as having (or not having) 'chronic disabling fatigue' (CDF, a proxy for CFS/ME) between the ages 13 and 18 years, and we investigated the associations of sleep duration at age nine years with CDF at age 13 years, as well as sleep duration at age 11 years with CDF at age 16 years. RESULTS Children who had CDF during adolescence had shorter night-time sleep duration from 6 months to 11 years of age, and there was strong evidence that difficulties in going to sleep were more common in children who subsequently developed CDF. The odds of CDF at age 13 years were 39% lower (odds ratio (OR) = 0.61, 95% CI = 0.43, 0.88) for each additional hour of night-time sleep at age nine years, and the odds of CDF at age 16 years were 51% lower (OR = 0.49, 95% CI = 0.34, 0.70) for each additional hour of night-time sleep at age 11 years. Mean night-time sleep duration at age nine years was 13.9 (95% CI = 3.75, 24.0) minutes shorter among children who developed CDF at age 13 years, and sleep duration at age 11 years was 18.7 (95% CI = 9.08, 28.4) minutes shorter among children who developed CDF at age 16 (compared with children who did not develop CDF at 13 and 16 years, respectively). CONCLUSIONS Children who develop chronic disabling fatigue in adolescence have shorter night-time sleep duration throughout early childhood, suggesting that sleep abnormalities may have a causal role in CFS/ME or that sleep abnormalities and CFS/ME are associated with a common pathophysiological cause.
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Affiliation(s)
- Simon M Collin
- Centre for Child and Adolescent Health, University of Bristol, Oakfield House, Oakfield Grove, Bristol, BS8 2BN, UK; Bristol Medical School, University of Bristol, Canynge Hall, 39 Whatley Road, Bristol, BS8 2PS, UK
| | - Tom Norris
- Department of Health Sciences, College of Medicine, Biological Sciences and Psychology, University of Leicester, Centre for Medicine, University Road, Leicester, LE1 7RH, UK
| | - Paul Gringras
- Evelina London Children's Hospital, Guy's and St Thomas' NHS Foundation Trust, Westminster Bridge Road, London, SE1 7EH, UK
| | - Peter S Blair
- Bristol Medical School, University of Bristol, Canynge Hall, 39 Whatley Road, Bristol, BS8 2PS, UK
| | - Kate Tilling
- Bristol Medical School, University of Bristol, Canynge Hall, 39 Whatley Road, Bristol, BS8 2PS, UK
| | - Esther Crawley
- Centre for Child and Adolescent Health, University of Bristol, Oakfield House, Oakfield Grove, Bristol, BS8 2BN, UK; Bristol Medical School, University of Bristol, Canynge Hall, 39 Whatley Road, Bristol, BS8 2PS, UK.
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Josev EK, Jackson ML, Bei B, Trinder J, Harvey A, Clarke C, Snodgrass K, Scheinberg A, Knight SJ. Sleep Quality in Adolescents With Chronic Fatigue Syndrome/Myalgic Encephalomyelitis (CFS/ME). J Clin Sleep Med 2017; 13:1057-1066. [PMID: 28760189 PMCID: PMC5566461 DOI: 10.5664/jcsm.6722] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 06/12/2017] [Accepted: 06/14/2017] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES Little is known about the type and severity of sleep disturbances in the pediatric chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) population, compared with healthy adolescents. Using a range of objective and subjective measures, the aim of this study was to investigate sleep quality, the relationship between objective and subjective measures of sleep quality, and their associations with anxiety in adolescents with CFS/ME compared with healthy controls. METHODS Twenty-one adolescents with CFS/ME aged 13 to 18 years (mean age 15.57 ± 1.40), and 145 healthy adolescents aged 13 to 18 years (mean age 16.2 ± 1.00) wore actigraphy watches continuously for 2 weeks to collect a number of objective sleep variables. The Pittsburgh Sleep Quality Index was used to obtain a subjective measure of sleep quality. Anxiety was measured by the Spence Children's Anxiety scale. RESULTS On average over the 2-week period, adolescents with CFS/ME were found to have (1) significantly longer objective sleep onset latency, time in bed, total sleep time, and a later rise time (all P < .005), and (2) significantly poorer subjective sleep quality (P < .001), compared with healthy adolescents. The CFS/ME patient group displayed higher levels of anxiety (P < .05), and in both groups, higher levels of anxiety were significantly related to poorer subjective sleep quality (P < .001). CONCLUSIONS This study provides objective and subjective evidence of sleep disturbance in adolescents with CFS/ME compared with healthy adolescent controls.
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Affiliation(s)
- Elisha K Josev
- Clinical Sciences, Murdoch Childrens Research Institute, Royal Children's Hospital, Melbourne, Australia
- Melbourne School of Psychological Sciences, University of Melbourne, Melbourne, Australia
| | - Melinda L Jackson
- Melbourne School of Psychological Sciences, University of Melbourne, Melbourne, Australia
- School of Health and Biomedical Sciences, Royal Melbourne Institute of Technology, Melbourne, Australia
| | - Bei Bei
- Monash Institute of Cognitive and Clinical Neurosciences, School of Psychological Sciences, Monash University, Melbourne, Australia
- Centre for Women's Mental Health, Department of Psychiatry, University of Melbourne, Royal Women's Hospital, Melbourne, Australia
| | - John Trinder
- Melbourne School of Psychological Sciences, University of Melbourne, Melbourne, Australia
| | - Adrienne Harvey
- Clinical Sciences, Murdoch Childrens Research Institute, Royal Children's Hospital, Melbourne, Australia
- Developmental Medicine, Royal Children's Hospital, Melbourne, Australia
| | - Cathriona Clarke
- Clinical Sciences, Murdoch Childrens Research Institute, Royal Children's Hospital, Melbourne, Australia
| | - Kelli Snodgrass
- Clinical Sciences, Murdoch Childrens Research Institute, Royal Children's Hospital, Melbourne, Australia
| | - Adam Scheinberg
- Clinical Sciences, Murdoch Childrens Research Institute, Royal Children's Hospital, Melbourne, Australia
- Victorian Paediatric Rehabilitation Service, Royal Children's Hospital, Melbourne, Australia
- Department of Paediatrics, Monash University, Melbourne, Australia
| | - Sarah J Knight
- Clinical Sciences, Murdoch Childrens Research Institute, Royal Children's Hospital, Melbourne, Australia
- Victorian Paediatric Rehabilitation Service, Royal Children's Hospital, Melbourne, Australia
- Department of Paediatrics, University of Melbourne, Melbourne, Australia
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Snodgrass K, Harvey A, Scheinberg A, Knight S. Sleep Disturbances in Pediatric Chronic Fatigue Syndrome: A Review of Current Research. J Clin Sleep Med 2015; 11:757-64. [PMID: 25766714 PMCID: PMC4481060 DOI: 10.5664/jcsm.4854] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 02/06/2015] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Children and adolescents with chronic fatigue syndrome (CFS) frequently report sleep disturbances. However, little is known about the nature and severity of sleep disturbance and factors associated with sleep problems in pediatric CFS. The purpose of this review was to synthesize and critically appraise existing literature relating to sleep disturbances in pediatric CFS. METHODS Embase, CINAHL, PsychINFO, PubMed. and Medline databases were searched to retrieve all studies that included an assessment of sleep in pediatric CFS. Two reviewers independently assessed eligibility, extracted data, and systematically assessed reporting quality. RESULTS Six studies were included and these were mostly case-controlled designs. Findings varied across studies; however, most studies found that children and adolescents with CFS had significantly more sleep disturbances when compared to healthy controls. Significant methodological variations and limitations were apparent. CONCLUSIONS This review suggests that children and adolescents with CFS experience sleep disturbances. However, results need to be interpreted cautiously given the limited evidence available and its overall low quality. More research is required to elucidate the nature and extent of sleep disturbance in pediatric CFS and should focus on (1) identifying the specific types, causes, and severity of sleep disturbances; (2) the specific consequences of sleep disturbances; and (3) the most effective interventions for sleep problems in this population.
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Affiliation(s)
- Kelli Snodgrass
- Clinical Sciences, Murdoch Childrens Research Institute
- Department of Paediatrics, The University of Melbourne
| | - Adrienne Harvey
- Clinical Sciences, Murdoch Childrens Research Institute
- Department of Paediatrics, The University of Melbourne
- Victorian Paediatric Rehabilitation Service, The Royal Children's Hospital
| | - Adam Scheinberg
- Clinical Sciences, Murdoch Childrens Research Institute
- Victorian Paediatric Rehabilitation Service, The Royal Children's Hospital
- Faculty of Medicine, Monash University, Melbourne, Victoria, Australia
| | - Sarah Knight
- Clinical Sciences, Murdoch Childrens Research Institute
- Department of Paediatrics, The University of Melbourne
- Victorian Paediatric Rehabilitation Service, Monash Children's, Parkville, Victoria, Australia
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Rahman K, Burton A, Galbraith S, Lloyd A, Vollmer-Conna U. Sleep-wake behavior in chronic fatigue syndrome. Sleep 2011; 34:671-8. [PMID: 21532961 DOI: 10.1093/sleep/34.5.671] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
STUDY OBJECTIVES Disturbances of the internal biological clock manifest as fatigue, poor concentration, and sleep disturbances-symptoms reminiscent of chronic fatigue syndrome (CFS) and suggestive of a role for circadian rhythm disturbance in CFS. We examined circadian patterns of activity, sleep, and cortisol secretion in patients with CFS. DESIGN Case-control study, 5-day behavioral observation. SETTING Natural setting/home environment PARTICIPANTS 15 patients with CFS and 15 healthy subjects of similar age, sex, body mass index (BMI), and activity levels. INTERVENTIONS N/A. MEASUREMENTS Self-report questionnaires were used to obtain medical history and demographic information and to assess health behaviors, somatic and psychological symptoms, and sleep quality. An actiwatch accelerometer recorded activity and sleep patterns over 5 days with concurrent activity and symptom logs. Diurnal salivary cortisol secretion was measured. Additionally, overnight heart rate monitoring and pain sensitivity assessment was undertaken. RESULTS Ratings of symptoms, disability, sleep disturbance, and pain sensitivity were greater in patients with CFS. No between-group differences were found in the pattern or amount of sleep, activity, or cortisol secretion. Afternoon activity levels significantly increased evening fatigue in patients but not control subjects. Low nocturnal heart rate variability was identified as a biological correlate of unrefreshing sleep. CONCLUSIONS We found no evidence of circadian rhythm disturbance in CFS. However, the role of autonomic activity in the experience of unrefreshing sleep warrants further assessment. The activity symptom-relationship modelled here is of clinical significance in the approach to activity and symptom management in the treatment of CFS.
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