Effects of Whole-body Electrical Muscle Stimulation Exercise on Adults With Neuromuscular Disease

Inclusion Criteria: * Age 18 or older * Diagnosed with one or more of the following neuromuscular conditions: Amyotrophic lateral sclerosis, primary lateral sclerosis, progressive muscle atrophy, spinal muscular atrophy, postpolio syndrome, inclusion body myositis, pompedisease, fascioscapulohumeral muscular dystrophy, charcot marie tooth disease, chronic inflammatory demyelinating polyneuropathy, hereditary spastic paraplegia, myasthenia gravis, lambert-eaton myasthenic syndrome, postural orthostatic tachycardia syndrome, mitochondrial myopathy, nemaline myopathy, centronuclear myopathy, lumbar radiculopathy, non-specific low back pain. * Ability to stand for approximately 15 minutes continuously with or without an assistive device (i.e. the length of time to stand to take a shower, complete meal preparation, wait in line at the bank, etc.) * At least some anti-gravity strength in major muscle groups as assessed by manual muscle testing (i.e. 2+/5 strength or better) * Medical clearance to participate in an exercise program * Ability to provide informed consent * Ability to conform to the requirements of the study (i.e. attendance at assessment and intervention visits, maintain current level of non-study physical activity for the duration of the study, no intention to relocate mid-study) Exclusion Criteria: * Diagnosed with one of the following neuromuscular conditions: Becker's muscular dystrophy, Duchenne muscular dystrophy, limb-girdle muscular dystrophy, myotonic dystrophy type 1 or 2, Freidrich's ataxia, any other NMD with known or suspected cardiac involvement or muscle fiber structural integrity defects. * Concurrent participation in another interventional research study * Unable to tolerate 15 minutes of continuous standing with or without an assistive device * Presence of a pacemaker, metal implants, or other implanted medical devices that could impact participant safety during WB-EMS intervention * Presence of cochlear implant, cortical stimulator, deep brain stimulator, ventriculoperitoneal shunt, recent skull defect, seizure in the past 12 months while taking anti-epilepsy medication, or previous serious adverse event with TMS, which could impact participant safety during TMS testing * Presence of unstable acute or chronic disease (i.e. renal failure, rheumatologic disease, cardia arrhythmia, neoplasm, uncontrolled hypertension) * Known pregnancy at time of screening; verbal screening will occur throughout the study. * Presence of a terminal disease (i.e. receiving hospice services) * Current or previous use of any drugs known to influence muscle mass or performance within 6 months; these may include but are not limited to anabolic steroids, IGF01, growth hormone, replacement androgen therapy, anti-androgen therapy * Presence of an additional neurologic conditions affecting somatosensory or motor function/control (i.e. Parkinson's disease, Multiple Sclerosis, h/o stroke, TBI, SCI, ataxia, apraxia, hemiplegia, etc.) * Musculoskeletal condition or surgery in the past year that would confound results of exercise interventions (i.e. TKA, THA, RTC repair, spinal fusion) * Other medical conditions, signs, or symptoms that would interfere with study conductor interpretation of results as determined by an investigator