Muscle Electro-Stimulation and Fatigue (muscle-electrostimulation-fatigue)
1 von Deneen et al. 2024 — Rhabdomyolysis From a Single EMS Session (FM + CFS)
Full Citation:: von Deneen KM, Alemayehu DG, Khosla A. Acute Compartment Syndrome and Rhabdomyolysis Caused by a Single Electrical Muscle Stimulation in a 46-Year-Old Female Professional Athlete With Fibromyalgia, Chronic Fatigue Syndrome, and Myofascial Disorder: A Case Report. Clinical Journal of Sport Medicine. 2024;34(5):506–508. Deneen, Alemayehu, and Khosla (2024) DOI:: 10.1097/JSM.0000000000001216 PMID:: 38456638 Article Type:: Case report Key Findings::
- Single EMS training session in a 46-year-old professional athlete with fibromyalgia, CFS, and myofascial disorder caused rhabdomyolysis and gluteal compartment syndrome
- Managed with intensive IV fluids, sodium bicarbonate, electrolyte/renal monitoring
- Authors conclude EMS poses increased risk of severe complications in chronic disease and myopathy; recommend against high-frequency EMS for first-time usersConclusion:: EMS can cause severe muscle injury (rhabdomyolysis) in chronic-disease patients — direct evidence against “EMS is always safe.” Limitations:: Single case (n = 1); athlete with triple comorbidity; cannot estimate population risk. ME/CFS Relevance:: F4 harm — the only published direct EMS-in-CFS adverse-event report; grounds the contraindication warning. Certainty Assessment::
- *Quality:* Low (case report)
- *Sample:* n = 1
- *Replication:* Single case
- *Score:* 0.35 (raw; population 0.80 → discounted 0.28)2 Brown et al. 2015 — Electrical Pulse Stimulation in CFS Muscle Cells
Full Citation:: Brown AE, Jones DE, Walker M, Newton JL. Abnormalities of AMPK activation and glucose uptake in cultured skeletal muscle cells from individuals with chronic fatigue syndrome. PLoS One. 2015;10(4):e0122982. (Brown et al. 2015) DOI:: 10.1371/journal.pone.0122982 PMID:: 25836975 Article Type:: In vitro (primary cell culture) Key Findings::
- Electrical pulse stimulation (EPS) for 16 h raised AMPK phosphorylation and glucose uptake in control muscle cells but NOT in CFS cells
- CFS cells showed increased myogenin expression and diminished IL-6 secretion at baseline and after EPS
- Glucose uptake remained insulin-responsive — a contraction-specific, not global, metabolic defectConclusion:: Electrically-driven contraction fails to trigger normal AMPK/glucose response in ME/CFS muscle — the exercise-metabolic response is impaired at the cell level. Limitations:: In vitro (n = 10 CFS, 7 controls); cell culture may not reflect in vivo contraction. ME/CFS Relevance:: F2 mechanism — electrical contraction (exercise mimetic) reproduces the ME/CFS bioenergetic defect; foundational for the contraction-metabolism trigger hypothesis. Certainty Assessment::
- *Quality:* Medium (in vitro, well-controlled)
- *Sample:* n = 10 CFS vs 7 controls
- *Replication:* Replicated in Brown 2018 follow-up
- *Score:* 0.40 (raw; in vitro 0.40 → discounted 0.16)3 Gibson et al. 1993 — Exercise Fatiguability in CFS
Full Citation:: Gibson H, Carroll N, Clague JE, Edwards RH. Exercise performance and fatiguability in patients with chronic fatigue syndrome. Journal of Neurology, Neurosurgery, and Psychiatry. 1993;56(9):993–998. (Gibson et al. 1993) DOI:: 10.1136/jnnp.56.9.993 PMID:: 8410041 Article Type:: Prospective case-control Key Findings::
- Quadriceps contractile properties (MVC, 20:50 Hz tetanic force ratio, relaxation rate) assessed by percutaneous electrical stimulation were normal before and up to 48 h after exercise in 12 CFS patients
- Exercise duration and heart-rate/work-rate relationship matched controls
- CFS patients had raised perceived exertion at matched heart rate (Borg +3.2 units)Conclusion:: Peripheral muscle function (including electrically-stimulated force) is normal in CFS; central/effort factors limit exercise. Limitations:: Small n (12 + 12); 1993 study predates modern PEM criteria. ME/CFS Relevance:: F3 null — electrically-driven contraction produces no abnormal peripheral muscle response, arguing against contraction metabolism as the fatigue trigger. Certainty Assessment::
- *Quality:* Medium (top journal, small n)
- *Sample:* n = 12 CFS + 12 controls
- *Replication:* Consistent with Edwards 1993
- *Score:* 0.55 (raw; population 1.00 → discounted 0.55)4 Edwards et al. 1993 — Muscle Histopathology and Physiology in CFS
Full Citation:: Edwards RH, Gibson H, Clague JE, Helliwell T. Muscle histopathology and physiology in chronic fatigue syndrome. Ciba Foundation Symposium. 1993;173:102–117. (Edwards et al. 1993) DOI:: 10.1002/9780470514382.ch7 PMID:: 8491096 Article Type:: Prospective cohort (biopsy + physiology) Key Findings::
- 108 CFS/muscle-pain patients + 22 controls: no consistent correlation between symptoms and fibre-type, fibre-size, degeneration/regeneration, glycogen depletion, or mitochondrial changes
- Voluntary and electrically-stimulated force normal at rest and during recovery in 12 CFS patientsConclusion:: On physiological and pathological grounds CFS is not a myopathy. Limitations:: Physiology subset small (12 + 12); histopathology semi-quantitative. ME/CFS Relevance:: F3 null — the largest early study finding no muscle-contraction abnormality in CFS. Certainty Assessment::
- *Quality:* Medium
- *Sample:* n = 108 (histopathology) / 12 (physiology)
- *Replication:* Consistent with Gibson 1993
- *Score:* 0.55 (raw; population 1.00 → discounted 0.55)6 Jammes & Retornaz 2019 — Neuromuscular Disorders in CFS
Full Citation:: Jammes Y, Retornaz F. Understanding neuromuscular disorders in chronic fatigue syndrome. F1000Research. 2019;8:F1000 Faculty Rev-2020. (Jammes and Retornaz 2019) DOI:: 10.12688/f1000research.18660.1 PMID:: 31814961 Article Type:: Narrative review Key Findings::
- Both central and peripheral fatigue demonstrated in ME/CFS by neurophysiological tools
- Peripheral fatigue = reduced amplitude + lengthened duration of myopotentials evoked by direct muscle stimulation (impaired membrane conduction)
- Lipid hydroperoxide formation in the sarcolemma and reduced heat-shock-protein formation explain oxidative-stress-driven membrane inexcitabilityConclusion:: ME/CFS muscle shows abnormal responses to direct electrical stimulation — a peripheral membrane/conduction defect driven by oxidative stress. Limitations:: Review; open peer-review venue (F1000). ME/CFS Relevance:: F2 mechanism — strongest evidence that ME/CFS muscle responds abnormally to electrically-driven contraction. Certainty Assessment::
- *Quality:* Medium (synthesis of replicated findings)
- *Sample:* n/a (synthesis)
- *Replication:* Multiple underlying Jammes studies (2005–2021)
- *Score:* 0.50 (raw 0.55 capped at narrative-review tier 0.50; population 1.00 → discounted 0.50)7 Jacobsen et al. 1991 — Electrical Twitch Interpolation in Fibromyalgia
Full Citation:: Jacobsen S, Wildschiødtz G, Danneskiold-Samsøe B. Isokinetic and isometric muscle strength combined with transcutaneous electrical muscle stimulation in primary fibromyalgia syndrome. The Journal of Rheumatology. 1991;18(9):1390–1393. (Jacobsen, Wildschiødtz, and Danneskiold-Samsøe 1991) PMID:: 1757942 Article Type:: Prospective case-control Key Findings::
- Fibromyalgia (n = 20) strength 44–45% lower than controls (p = 0.0001)
- Superimposed electrically-elicited twitches present in 65% of patients vs 15% controls during maximal voluntary contraction (p = 0.003)Conclusion:: Increased superimposed twitch indicates submaximal volitional force — central activation failure in fibromyalgia. Limitations:: Small n; 1991 study; fibromyalgia (not ME/CFS). ME/CFS Relevance:: F4 central — electrically-evoked twitch exposes impaired central motor drive in a chronic-fatigue condition. Certainty Assessment::
- *Quality:* Medium
- *Sample:* n = 20 + 20
- *Replication:* Single study
- *Score:* 0.50 (raw; population 0.80 → discounted 0.40)8 Burgess et al. 2021 — NMES for COVID-19 ICU Recovery
Full Citation:: Burgess LC, Venugopalan L, Badger J, et al. Effect of neuromuscular electrical stimulation on the recovery of people with COVID-19 admitted to the intensive care unit: A narrative review. Journal of Rehabilitation Medicine. 2021;53(3):jrm00164. (Burgess et al. 2021) DOI:: 10.2340/16501977-2805 PMID:: 33634830 Article Type:: Narrative review Key Findings::
- NMES can prevent muscle atrophy, improve strength and function, maintain blood flow, and reduce oedema when voluntary contraction is difficult or impossible
- ICU-acquired weakness affects ~40% of ICU admissions; NMES usable during ventilator weaning and into post-acute/long-COVID phasesConclusion:: NMES is a viable muscle-preservation modality for deconditioned patients who cannot exercise voluntarily. Limitations:: Narrative review; COVID-19/ICU population; no ME/CFS-specific data. ME/CFS Relevance:: F1 safe-substitute — transfers the bedbound muscle-preservation rationale to deconditioned ME/CFS patients. Certainty Assessment::
- *Quality:* Medium (review)
- *Sample:* n/a (synthesis)
- *Replication:* n/a
- *Score:* 0.50 (raw; population 0.85 → discounted 0.43)9 Maffiuletti et al. 2019 — NMES Countermeasure for Spaceflight Atrophy
Full Citation:: Maffiuletti NA, Green DA, Vaz MA, Dirks ML. Neuromuscular Electrical Stimulation as a Potential Countermeasure for Skeletal Muscle Atrophy and Weakness During Human Spaceflight. Frontiers in Physiology. 2019;10:1031. (Maffiuletti et al. 2019) DOI:: 10.3389/fphys.2019.01031 PMID:: 31456697 Article Type:: Narrative/mini-review Key Findings::
- NMES evokes involuntary contractions that preserve/restore muscle mass and neuromuscular function during disuse, per terrestrial immobilization evidence
- Knee extensors and plantar flexors are most susceptible to deconditioningConclusion:: NMES is an evidence-based disuse-atrophy countermeasure requiring no large exercise equipment. Limitations:: Spaceflight/disuse population; healthy-subject extrapolation. ME/CFS Relevance:: F1 — underpins the physiological case for NMES as a bedbound deconditioning countermeasure. Certainty Assessment::
- *Quality:* Medium (review)
- *Sample:* n/a (synthesis)
- *Replication:* n/a
- *Score:* 0.50 (raw; population 0.75 → discounted 0.38)10 Inns et al. 2021 — NMES vs PNS Fatigability
Full Citation:: Inns TB, McCormick D, Greig CA, Atherton PJ, Phillips BE, Piasecki M. Factors associated with electrical stimulation-induced performance fatigability are dependent upon stimulation location. Experimental Physiology. 2021;106(4):828–836. (Inns et al. 2021) DOI:: 10.1113/EP089204 PMID:: 33638246 Article Type:: Experimental physiology study Key Findings::
- NMES induced progressive M-wave duration increase and delayed muscle relaxation during stimulation — superficial-fibre-only recruitment and performance fatigability
- Peripheral nerve stimulation (PNS) recruited a wider motor-unit pool with less fatigabilityConclusion:: Standard over-muscle NMES fatigues a superficial fibre subset; PNS is a favourable alternative for rehabilitation. Limitations:: Healthy young volunteers; acute single-session design. ME/CFS Relevance:: F4 — NMES may preferentially overload a shallow fibre pool, relevant to a disease with impaired recovery. Certainty Assessment::
- *Quality:* Medium (experimental)
- *Sample:* small (healthy volunteers)
- *Replication:* Single study
- *Score:* 0.45 (raw; population 0.75 → discounted 0.34)11 Tajima et al. 2021 — Hybrid NMES Increases Oxygen Uptake
Full Citation:: Tajima H, Matsuse H, Hashida R, et al. Electrically stimulated eccentric contraction during non-weight bearing knee bending exercise in the supine position increases oxygen uptake: A randomized, controlled, exploratory crossover trial. PLoS One. 2021;16(11):e0259856. (Tajima et al. 2021) DOI:: 10.1371/journal.pone.0259856 PMID:: 34793521 Article Type:: Randomized crossover trial Key Findings::
- Hybrid NMES (synchronized with volitional knee bending) raised oxygen uptake by ~14% (7.29 → 8.29 ml/kg/min, p = 0.0115) and heart rate (80.8 → 86.4 bpm, p = 0.0153) vs unstimulated exerciseConclusion:: Adding EMS to bed-exercise imposes measurable additional metabolic and cardiorespiratory load. Limitations:: n = 10 healthy subjects; exploratory; single acute session. ME/CFS Relevance:: F1/F2 bridge — EMS is a bed-rest countermeasure but is not metabolically “free”; it adds contractile demand that could contribute to PEM. Certainty Assessment::
- *Quality:* Medium (RCT crossover)
- *Sample:* n = 10
- *Replication:* Single study
- *Score:* 0.45 (raw; population 0.75 → discounted 0.34)12 Vecchiet et al. 2003 — Electrical Pain Threshold and Oxidative Stress in CFS
Full Citation:: Vecchiet J, Cipollone F, Falasca K, et al. Relationship between musculoskeletal symptoms and blood markers of oxidative stress in patients with chronic fatigue syndrome. Neuroscience Letters. 2003;335(3):151–154. (Vecchiet et al. 2003) DOI:: 10.1016/s0304-3940(02)01058-3 PMID:: 12531455 Article Type:: Case-control Key Findings::
- CFS (n = 21) vs controls: higher LDL-TBARS, lower vitamin E and lag phase (oxidative stress), and lower muscle pain threshold to electrical stimulation
- Fatigue correlated directly with TBARS and inversely with lag phase and vitamin EConclusion:: Muscle is more electrically sensitive in CFS, tracking oxidative stress and symptom severity. Limitations:: Small n; electrical stimulation used as a pain-threshold probe, not a contraction intervention. ME/CFS Relevance:: Indirect link — electrically-elicited muscle sensitivity is elevated in CFS and reflects oxidative stress. Certainty Assessment::
- *Quality:* Medium
- *Sample:* n = 21 CFS + 20 controls
- *Replication:* Single study
- *Score:* 0.50 (raw; population 1.00 → discounted 0.50)13 Nosaka2011 — Muscle Damage Induced by Electrical Stimulation
- Full Citation:: Nosaka, K., Aldayel, A., Jubeau, M., & Chen, T.C. (2011). Muscle damage induced by electrical stimulation. European Journal of Applied Physiology, 111(10), 2427–2437.
- DOI:: 10.1007/s00421-011-2086-x
- Key Findings::
- Electrical stimulation induces muscle damage: histological fibre and connective-tissue alteration, circulating creatine kinase (CK) elevation, strength loss, and DOMS — from both eccentric and isometric ES contractions.
- ES-evoked isometric damage is comparable in magnitude to maximal voluntary eccentric contractions.
- Mechanism: non-selective, synchronous, spatially-fixed motor-unit recruitment → high mechanical stress on activated (type II) fibres.
- Repeated-bout effect: damage markedly reduced on a second bout 2–4 weeks later.
- Conclusion:: ES provokes the same micro-trauma pathway as unaccustomed exercise; damage is first-exposure-driven and preconditionable.
- Limitations:: General/athletic population; no ME/CFS.
14 Vanderthommen2015 — Protection Against NMES-Induced Muscle Damage
- Full Citation:: Vanderthommen, M., Chamayou, R., Demoulin, C., Crielaard, J.-M., & Croisier, J.-L. (2015). Protection against muscle damage induced by electrical stimulation. Clinical Physiology and Functional Imaging, 35(4), 267–274.
- DOI:: 10.1111/cpf.12160
- Key Findings::
- One NMES bout (100 quadriceps + 100 hamstrings contractions) raised serum CK to ~2307 IU/L and VAS soreness to ~4.2 cm in unaccustomed muscle.
- Damage markers fell markedly on the second bout 5 weeks later (CK 218 IU/L) — repeated-bout protective effect.
- Conclusion:: NMES causes measurable muscle damage on first exposure; a single prior bout confers protection.
- Limitations:: n=16 healthy men; no ME/CFS.
15 Fessard2025 — NMES Hypertrophy Without Overt Muscle Damage
- Full Citation:: Fessard, A., Zavoriti, A., Boyer, N., et al. (2025). NMES training induces myonuclear accretion and hypertrophy in mice without overt signs of muscle damage and regeneration. Skeletal Muscle, 15(1), 3.
- DOI:: 10.1186/s13395-024-00372-0
- Key Findings::
- Low-intensity NMES (~15% of maximal tetanic force, 80 isometric contractions/session) induced myonuclear accretion and hypertrophy without overt damage/regeneration.
- Establishes intensity-dependence: NMES damage occurs only above a threshold; low-intensity NMES is non-damaging.
- Conclusion:: The damaging vs. non-damaging character of NMES is intensity-dependent.
- Limitations:: Animal model; isometric only; generalizability to human high-intensity protocols uncertain.
16 Pfeifer2024 — ES-Induced Myofiber Damage and Macrophage Infiltration
- Full Citation:: Pfeifer, B., King, B., Ahmadi, M., et al. (2024). Menstrual cycle phase differences in myofiber damage and macrophage infiltration following electrical stimulation-induced muscle injury. Am J Physiol Endocrinol Metab, 327(5), E616–E625.
- DOI:: 10.1152/ajpendo.00168.2024
- Key Findings::
- 200 electrically stimulated eccentric contractions produced biopsy-confirmed myofiber necrosis, regeneration, and macrophage infiltration.
- Demonstrates ES injury triggers the full damage-then-inflammatory cascade.
- Conclusion:: ES-induced muscle injury recruits the inflammatory response, the same cascade as exercise-induced damage.
- Limitations:: n=28 healthy women; no ME/CFS.