Tag: adolescents

Clinical Symptomatology, Cognition and Psychosocial Wellbeing in Adolescents With Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: A Cross-Sectional Observational Study

Abstract:

Aim: Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a disabling illness that frequently begins in adolescence, yet adolescents with ME/CFS remain an under-researched population. We aimed to characterise the cognitive and psychosocial wellbeing of adolescents with ME/CFS relative to normative benchmarks and unaffected age-peers.

Methods: Adolescents with mild-to-moderate ME/CFS (n = 25) and healthy controls (n = 25) aged 10-19 years were recruited in Melbourne, Australia. Each completed a set of clinical questionnaires and cognitive assessments to assess ME/CFS symptomatology, school functioning, psychosocial wellbeing and cognition. Their caregivers also completed questionnaires regarding their psychosocial wellbeing and everyday executive functioning.

Results: Adolescents with ME/CFS showed significantly reduced information processing speed, though other measures of intellectual functioning did not differ consistently between groups. The ME/CFS group also reported significantly poorer sleep, quality of life and higher levels of anxiety and depression. Caregivers further identified significant attention and working memory concerns in the ME/CFS group, but reported no differences in internalising behaviours between groups.

Conclusion: Adolescents with ME/CFS experience substantial psychosocial and physical burden because of their illness. Cognitive difficulties in ME/CFS may reflect inefficiencies in information processing speed and fluctuating symptom burden. Discrepancies between adolescent self-report and caregiver ratings underscore the importance of inclusive perspectives in ME/CFS management. These findings support the need for flexible, paced educational and clinical accommodations and for further research into the dynamic cognitive profile of adolescents with ME/CFS across a more representative population.

Source: Chau T, Josev EK, Scheinberg A, Thomas N, McDonald F, Reveley C, Gooley PR, Armstrong C, Knight S. Clinical Symptomatology, Cognition and Psychosocial Wellbeing in Adolescents With Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: A Cross-Sectional Observational Study. J Paediatr Child Health. 2026 Sep 20. doi: 10.1111/jpc.70587. Epub ahead of print. PMID: 42764669. https://onlinelibrary.wiley.com/doi/10.1111/jpc.70587 (Full text)

Postural orthostatic tachycardia syndrome in adolescents with ME/CFS – a case control study

Abstract:

Introduction: Postural orthostatic tachycardia syndrome (PoTS) can be associated with myalgic encephalomyelitis/ chronic fatigue syndrome (ME/CFS). Pediatric PoTS requires a “sustained” rise in orthostatic heart rate ≥40 bpm above supine heart rate (relative limit), often >120 bpm (absolute limit). However, the diagnostic criteria for PoTS in adolescents remain underexplored, particularly regarding the definition of “sustained” tachycardia, which poses challenges in clinical and research settings. This study examined orthostatic intolerance criteria, including PoTS, in adolescents with ME/CFS and healthy controls.

Methods: Medical history of orthostatic intolerance was assessed by a semi-structured interview with 18 ME/CFS patients and 18 matched healthy controls (14-17 years). A passive 10-min standing test with minute-by-minute heart rate and blood pressure registration was performed. PoTS was diagnosed by a clinical expert based on current consensus criteria. Data were analyzed using Fisher’s exact test and receiver operating characteristic analysis.

Results: Although history of orthostatic intolerance was positive in 15/18 ME/CFS [83%, 0.95 CI (61; 94)] and 3/18 healthy controls [17%, 0.95 CI (5.9; 39)], PoTS was diagnosed in only 7/18 ME/CFS [39%, 0.95 CI (20; 61)] vs. no healthy controls [0%, 0.95 CI (0; 18)]. Subgroups were identified, e.g., positive history of orthostatic intolerance yet physiological passive 10-min standing test, or negative history of orthostatic intolerance yet tachycardia in passive 10-minute standing test. PoTS diagnosis by the clinical expert matched best with the passive 10-min standing test alone when at least 60% of upright heart rate values were above one or both limits. The absolute limit was superior to the relative limit in distinguishing adolescents with and without PoTS.

Discussion: PoTS was observed only in ME/CFS. In adolescents with ME/CFS, positive history of orthostatic intolerance, along with at least 60% of heart rate values above published upright-position limits, may allow non-experts to make a valid diagnosis, facilitating clinical care and future studies. Further research will show if these results can be generalized.

Source: Leone A, Gerrer K, Viereck A, Grabbe A, Kircher A, Behrends U, Maier A. Postural orthostatic tachycardia syndrome in adolescents with ME/CFS – a case control study. Front Pediatr. 2026 Sep 1;14:1836407. doi: 10.3389/fped.2026.1836407. PMID: 42746015; PMCID: PMC13574936. https://pmc.ncbi.nlm.nih.gov/articles/PMC13574936/ (Full text)

Handgrip strength in children, adolescents, and young adults with suspected myalgic encephalomyelitis/chronic fatigue syndrome

Abstract:

Background: Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) in children, young people (CYP) lacks validated diagnostic biomarkers. Post-exertional malaise (PEM) is central to case definitions and is usually assessed by patient report. We evaluated the feasibility and clinical value of handgrip strength (HGS) testing in PEM-reporting CYP referred for suspected ME/CFS.

Methods: In this prospective observational study at the Munich Chronic Fatigue Center for Young People (November 2022-November 2024), 147 patients (10-25 years) referred for the assessment of ME/CFS with positive DSQ-PEM screening and 83 healthy controls (HC) completed two HGS sessions (10 maximal grips/session; 3-s contraction/5-s rest; 60-minute inter-session break) using a digital dynamometer. We derived maximal force (Fmax), mean force (Fmean), fatigue ratio (FR = Fmax/Fmean), and recovery ratio (RR = Fmean session 2 / session 1). Analyses used repeated-measures ANCOVA, linear regression, partial Spearman correlations (adjusted for sex, age, and BMI), and proportional odds models for group membership (HC, noME/CFS, ME/CFS), reporting accuracy, and the C-statistic. Sensitivity analyses compared noME/CFS with confirmed CCC-ME/CFS.

Results: After clinical work-up, 84/147 (57%) patients were classified as ME/CFS (confirmed or probable) and 63/147 (43%) as noME/CFS. HGS test completion rate was high (session 1: 146/147, 99.3%; session 2: 142/147, 96.6%). Compared with HC, patients had substantially lower HGS (mean difference -9.93 kg, 95% CI: -12.00 to -7.85), and HGS indices correlated modestly with physical functioning (SF-12 PCS), but not with PEM duration. Both noME/CFS and ME/CFS groups differed from HC in absolute strength indices (Fmean, Fmax) and FR. RR differed between ME/CFS and HC, whereas no HGS index significantly separated noME/CFS from ME/CFS. In proportional odds models, each HGS index improved fit (all p < 0.001), but discrimination across HC, noME/CFS, and ME/CFS patients was moderate (accuracy 49.2-57.3% vs no-information rate 36.5%, with best performance for Fmean in session 2). In the CCC-restricted sensitivity analysis, discrimination between confirmed CCC-ME/CFS and noME/CFS was moderate (accuracy 62.8-70.7%; C-statistic 0.63-0.73), with best performance for absolute strength indices and RR.

Conclusions: Standardized two-session repeated HGS testing is feasible in CYP with chronic fatigue and self-reported PEM and provides an objective marker of functional impairment that aligns with physical health status but not with PEM duration. However, HGS alone shows limited ability to discriminate ME/CFS from other fatiguing noME/CFS conditions. HGS may be useful for quantitative phenotyping, patient stratification, and longitudinal outcome assessment rather than as a standalone diagnostic biomarker.

Source: Mihatsch L, Schartner L, de Luna JL, Höhler C, Bucka L, Lovrenovic L, Eidenschink S, Schmuck B, Bienemann V, Christa C, Mittelstraß K, Hausruckinger A, Warlitz C, Michel K, Gerrer K, Freitag H, Scheibenbogen C, Pricoco R, Behrends U. Handgrip strength in children, adolescents, and young adults with suspected myalgic encephalomyelitis/chronic fatigue syndrome. J Transl Med. 2026 Jul 15. doi: 10.1186/s12967-026-08654-5. Epub ahead of print. PMID: 42458481. https://link.springer.com/article/10.1186/s12967-026-08654-5 (Full text available as PDF file)

Novel activity and participation scales for children, adolescents, and young adults with postacute infection and vaccination syndromes and/or ME/CFS

Abstract:

Children, adolescents, and young adults (CYP) with postacute infection and vaccination syndromes (PAIVS), and/or myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), experience profound loss in activity and participation. We introduce and psychometrically validate two new brief, age-adapted, and domain-specific questionnaires for clinical use assessing activity and participation in this vulnerable patient group.

For this, 91 patients (aged 10-25 years) were assessed at the Munich Chronic Fatigue Center (MCFC) from 12/2022 to 11/2024. We designed the MCFC Activity Scale and MCFC Participation Scale and assessed construct validity using confirmatory factor analysis for both questionnaires. Reliability was evaluated via Cronbach’s α. Factor-based MCFC Activity and Participation Scores (0-100) were derived and correlated with Bell Score, FSS, DSQ-PEM, and SF-12 Component Summary Scales (PCS and MCS). Discrimination for ME/CFS was evaluated using ROC analyses. Participants (mean age 15.6 ± 2.4 years) were predominantly female (64%). 65% were diagnosed with ME/CFS.

The MCFC Activity Scale showed excellent one-factor fit (comparative fit index, CFI = 1.00) and good internal consistency (α = 0.82). The MCFC Participation Scale showed good internal consistency (α = 0.85) and acceptable one-factor fit (CFI = 0.817). Factor-based activity and participation were strongly correlated yet distinct (r = 0.73). Derived MCFC Activity and Participation Scores differed significantly by ME/CFS diagnosis (p ≤ 0.009). Scores correlated with Bell Score, FSS, DSQ-PEM, and SF-12 PCS (all p ≤ .002). For ME/CFS discrimination, the Activity Score achieved an AUC = 0.78 and the Participation Score an AUC = 0.72.

Conclusion: The Activity Scale demonstrated strong construct validity. The Participation Scale showed good internal consistency. Both scores demonstrated good convergent validity with established patient-reported outcome measures, supporting clinical utility. They may serve as pragmatic screening tools for this vulnerable patient group.

Source: Weidmann C, Grabbe A, Eberhartinger M, Kircher A, Leone A, Warlitz C, Stojanov S, Behrends U, Mihatsch LL. Novel activity and participation scales for children, adolescents, and young adults with postacute infection and vaccination syndromes and/or ME/CFS. Eur J Pediatr. 2026 Jun 5;185(7):471. doi: 10.1007/s00431-026-07125-9. PMID: 42249231. https://link.springer.com/article/10.1007/s00431-026-07125-9 (Full text)

Validation of the Wood Mental Fatigue Inventory in adolescents with myalgic encephalomyelitis/chronic fatigue syndrome

Abstract:

Background: There is no consensus regarding the most reliable and valid measures of cognitive dysfunction in adolescents and adults with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). The Wood Mental Fatigue Inventory (WMFI) is commonly used in adults while the Pediatric Quality of Life Multidimensional Fatigue Scale (PedsQL MFS) is commonly used in adolescents. This study examined whether the WMFI was valid in adolescents.

Methods: Over a two-year period, participants in a cohort study completed four questionnaires: PedsQL, PedsQL MFS, Functional Disability Inventory (FDI), and WMFI. We examined the validity of the WMFI in 55 healthy adolescents and 55 with ME/CFS, determined how well the WMFI and PedsQL MFS cognitive fatigue subscale correlated with one another and with general quality of life surveys, and examined each questionnaire’s responsiveness to change over time.

Results: The PedsQL MFS cognitive fatigue subscale and the WMFI had a strong negative correlation for both healthy controls and ME/CFS patients at baseline with R2 values of 0.3915 and 0.8049 respectively. There was a similar strong negative correlation (R2 = 0.7739) between the two questionnaires in ME/CFS participants at the 24 month point of follow-up after multi-modal treatment. Each questionnaire was found to be similarly responsive to change.

Conclusion: The WMFI had a high correlation with the PedsQL MFS cognitive fatigue subscale. The WMFI has the advantage of ease of scoring. Both measures were responsive to changes in mental fatigue among those with ME/CFS over time.

Source: Welch DC, Edwards CC, Broussard CA, Swope ME, Christoforou ME, Matson PA, Azola AM, Rowe PC. Validation of the Wood Mental Fatigue Inventory in adolescents with myalgic encephalomyelitis/chronic fatigue syndrome. Brain Behav Immun Health. 2026 Mar 25;53:101222. doi: 10.1016/j.bbih.2026.101222. PMID: 41953581; PMCID: PMC13053862. https://pmc.ncbi.nlm.nih.gov/articles/PMC13053862/ (Full text)

Incidence age is bimodal for Myalgic Encephalomyelitis/Chronic Fatigue Syndrome, with higher severity burden for early onset disease

Abstract:

Myalgic Encephalomyelitis, or Chronic Fatigue Syndrome (ME/CFS), is a disease of uncertain origin. Studies of Norwegian health records have suggested that ME/CFS incidence across age groups is bimodal–a characteristic that could provide insight into the aetiology of the disease. Here, we analysed survey data from over 9,000 respondents with ME/CFS from 10 European countries, and observe an early onset peak with a mean of 16.0 years old (standard deviation [sd]: 4.3) and a late onset peak at 36.6 years old (sd: 10.5).

Statistical support for multimodal onset age was evident in 7 of the 10 countries examined. Infection as a trigger for ME/CFS is 10 percentage points higher among early compared to late onset disease (P = 2.1 × 10−13). Early onset ME/CFS was associated with greater odds of being severely or very severely affected (OR = 2.15, 95% CI [1.84—2.51], p < 2 × 10−16). Those with first degree relatives with ME/CFS had greater odds of early than late onset ME/CFS (OR = 1.43, 95% CI [1.25—1.63], P = 4.4 × 10−07). We further validated our findings in a UK dataset where we replicated bimodal onset age and observed significantly greater odds of glandular fever/infectious mononucleosis as a trigger in early onset cases (OR = 2.32, 95% CI [1.99—2.71], P = 2.4 × 10−24).

Our findings suggest that incidence of ME/CFS peaks in adolescence and in early middle-age and that early onset ME/CFS is more common in those with affected relatives, more often triggered by infection, and associated with more severe disease.

Source: Simon J Mcgrath, Charles B Hillier, Joshua J Dibble, Trude Schei, Arild Angelsen, Audrey A Ryback, Incidence age is bimodal for Myalgic Encephalomyelitis/Chronic Fatigue Syndrome, with higher severity burden for early onset disease, Oxford Open Immunology, 2026;, iqag007, https://doi.org/10.1093/oxfimm/iqag007 https://academic.oup.com/ooim/advance-article/doi/10.1093/oxfimm/iqag007/8527015

ICD-10 Diagnoses prior to ME/CFS diagnosis in children and young people suggest potential early diagnostic indicators

Abstract:

To identify ICD-10-GM codes recorded in the year preceding a Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) diagnosis, we conducted a 1:5 matched case–control study using statutory health insurance data of 6–27-year-olds with ME/CFS (ICD-10-GM: G93.3, 2020–2022). Cases (n = 6,077) were matched 1:5 to controls by birth year, sex, and postal code. ICD-10-GM codes from the preceding year were analyzed using multivariable conditional logistic regression, reporting odds ratios (OR) and 95% confidence intervals. Most cases were female and aged 18–27 years.

Forty-four ICD-10-GM code classes were associated with increased and four with decreased odds, spanning 13 diagnostic chapters. Most associations were in chapters F (mental/behavioral disorders), R (respiratory diseases), and M (musculoskeletal disorders). Frequent conditions included fatigue, depression, pain disorders, and somatoform disorders (≥ 10% in cases; ORs 1.11–2.19. Rare diagnoses (≤ 1% prevalence), such as fibromyalgia (OR 2.08, 95% CI: 1.20–3.59) and mild cognitive impairment (2.93, 1.21–7.10), were strongly associated. Four COVID-19 or vaccination-related code classes were identified, with post-COVID-19 condition showing the highest OR (3.84, 2.97–4.98). Several ICD-10-GM codes, including COVID-19 related codes, were associated with later ME/CFS diagnoses.

Prospective studies should clarify timing relative to ME/CFS onset, and distinguish between pre-existing conditions, comorbidities, early manifestations, or misdiagnoses.

Source:Wirth M, Haastert B, Linnenkamp U, Andrich S, Icks A, Pricoco R, Behrends U, De Bock F. ICD-10 Diagnoses prior to ME/CFS diagnosis in children and young people suggest potential early diagnostic indicators. Sci Rep. 2026 Feb 26. doi: 10.1038/s41598-026-40848-1. Epub ahead of print. PMID: 41741569. https://www.nature.com/articles/s41598-026-40848-1 (Full text)

“I would love to say it’s the fatigue but honestly it’s not”: Into Adulthood with Chronic Fatigue Syndrome/Myalgic Encephalomyelitis

Abstract:

Chronic Fatigue Syndrome/Myalgic Encephalomyelitis (CFS/ME) is a debilitating and poorly understood condition which interferes with adolescents’ typical development. This study aimed to explore the experience of transitioning into adulthood from the perspective of adolescents and young adults (16-25yo) with CFS/ME.

Thirteen young people recruited through a community allied health clinic in Victoria, Australia, participated in semi-structured interviews. Interviews were analysed using reflexive thematic analysis and produced the following themes: Independence: a different path or an inaccessible adulthood? Identity: who could I have been? Isolation and disconnection: being with people but not being like them.

Our analysis of these themes suggests several avenues to support young people with CFS/ME and their families. Mental health professionals may have a specific role in helping foster assertiveness and confidence, assisting identity exploration and understanding, and supporting families in helping their adolescent to continue to develop psychologically.

Source: Tenhave, A., Bognar, R., & Sidis, A. (2025). “I would love to say it’s the fatigue but honestly it’s not”: Into Adulthood with Chronic Fatigue Syndrome/Myalgic Encephalomyelitis. Psychology, Health & Medicine, 1–19. https://doi.org/10.1080/13548506.2025.2495891 https://www.tandfonline.com/doi/full/10.1080/13548506.2025.2495891 (Full text)

Provocation of brachial plexus and systemic symptoms during the elevated arm stress test in individuals with myalgic encephalomyelitis/chronic fatigue syndrome or idiopathic chronic fatigue

Abstract:

Background: We have noted that some adolescents and young adults with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) report difficulty with arms-overhead activities, suggestive of brachial plexus dysfunction or thoracic outlet syndrome (TOS). In the TOS literature, diagnostic maneuvers focus on the provocation of upper limb symptoms (arm fatigue and heaviness, paresthesias, neck and upper back pain), but not on elicitation of systemic symptoms.

Objectives: To estimate the proportion of patients with fatiguing illness who experience local and systemic symptoms during a common maneuver used in evaluating TOS-the elevated arm stress test (EAST).

Methods: Patients were eligible for this retrospective study if they had been referred to the Johns Hopkins Chronic Fatigue Clinic between January 2020 and July 2023 and (a) reported difficulty maintaining arms-overhead postures, (b) were evaluated with an abbreviated one-minute EAST, and (c) had not undergone surgery in the upper limb, neck, or skull base. Modified EAST procedure: patients sat with their arms in a “hands up” or “candlestick” position while opening and closing their hands every 2-3 s repeatedly for 1 min, rather than the customary 3 min. The test was considered abnormal for local symptoms if the participant experienced pain, fatigue, heaviness, paresthesias, warmth or tremulousness in the upper limb, shoulder, neck, head, or upper back. The test was considered abnormal for systemic symptoms if the participant experienced overall fatigue, cognitive fogginess, lightheadedness, racing heart, diaphoresis, dyspnea, overall warmth, or nausea.

Results: Of 154 patients evaluated during the study period, 64 (42%) met the eligibility criteria (61/64 female, median age 18 years [range, 13 to 50]). Of the 64, 50 (78%) had ME/CFS, 13 (20%) had idiopathic chronic fatigue with associated orthostatic intolerance (OI), and one had idiopathic chronic fatigue without OI. Of the 64, 58% had evidence of joint hypermobility. Local symptoms were provoked by EAST in 62/64 (97%) within a median of 20 s. During EAST, 26/64 (41%) reported systemic symptoms (1 had only systemic but no upper limb symptoms), most commonly lightheadedness (19%) and generalized fatigue (11%).

Conclusions: Even with an abbreviated test duration, the EAST maneuver provoked local and systemic symptoms in a substantial proportion of patients with chronic fatigue, OI, and ME/CFS who had reported difficulty with arms-overhead postures. Further studies are needed to explore the prevalence of brachial plexus or TOS symptoms in unselected individuals with ME/CFS or OI, and the proportion with systemic symptoms during and after EAST.

Source: Edwards CC 3rd, Byrnes JM, Broussard CA, Azola AM, Swope ME, Marden CL, Swope RL, Lum YW, Violand RL, Rowe PC. Provocation of brachial plexus and systemic symptoms during the elevated arm stress test in individuals with myalgic encephalomyelitis/chronic fatigue syndrome or idiopathic chronic fatigue. J Transl Med. 2025 Jan 22;23(1):106. doi: 10.1186/s12967-025-06137-7. PMID: 39844172; PMCID: PMC11752803. https://pmc.ncbi.nlm.nih.gov/articles/PMC11752803/ (Full text)

Serial Paediatrics Omics Tracking in Myalgic Encephalomyelitis (SPOT-ME): protocol paper for a multidisciplinary, observational study of clinical and biological markers of paediatric myalgic encephalomyelitis/chronic fatigue syndrome in Australian adolescents aged 12-19 years

Abstract:

Introduction: Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a disabling condition that can affect adolescents during a vulnerable period of development. The underlying biological mechanisms for ME/CFS remain unclear and have rarely been investigated in the adolescent population, despite this period representing an age peak in the overall incidence. The primary objective of this is to provide a foundational set of biological data on adolescent ME/CFS patients. Data generated will be compared with controls and over several time points within each patient to potentially develop a biomarker signature of the disease, identify subsets or clusters of patients, and to unveil the pathomechanisms of the disease.

Methods and analysis: This protocol paper outlines a comprehensive, multilevel, longitudinal, observational study in paediatric ME/CFS. ME/CFS patients aged 12-19 years and controls will donate biosamples of urine, blood, and peripheral blood mononuclear cells for an in-depth omics profiling analysis (whole-genome sequencing, metabolomics and quantitative proteomics) while being assessed by gold-standard clinical and neuropsychological measures. ME/CFS patients will then be provided with a take-home kit that enables them to collect urine and blood microsamples during an average day and during days when they are experiencing postexertional malaise. The longitudinal repeated-measures study design is optimal for studying heterogeneous chronic diseases like ME/CFS as it can detect subtle changes, control for individual differences, enhance precision and boost statistical power. The outcomes of this research have the potential to identify biomarker signatures, aid in understanding the underlying mechanisms, and ultimately, improve the lives of children with ME/CFS.

Ethics and dissemination: This project was approved by the Royal Children’s Hospital’s Human Research Ethics Committee (HREC 74175). Findings from this study will be disseminated through peer-reviewed journal publications and presentations at relevant conferences. All participants will be provided with a summary of the study’s findings once the project is completed.

Source: Thomas N, Chau T, Tantanis D, Huang K, Scheinberg A, Gooley PR, Josev EK, Knight SJ, Armstrong CW. Serial Paediatrics Omics Tracking in Myalgic Encephalomyelitis (SPOT-ME): protocol paper for a multidisciplinary, observational study of clinical and biological markers of paediatric myalgic encephalomyelitis/chronic fatigue syndrome in Australian adolescents aged 12-19 years. BMJ Open. 2024 Dec 10;14(12):e089038. doi: 10.1136/bmjopen-2024-089038. PMID: 39658280. https://bmjopen.bmj.com/content/14/12/e089038 (Full text)