Inclusion Criteria:

• * Adults 18-70 years of age
• * Chronic SCI for \> 1 year, at or below C-3 to T-12
• * Incomplete SCI based on residual sensory or motor function below the level of the injury, or injury classification of B, C, D at initial screening, according to the American Spinal Injury Association Impairment Classification, and the International Standards for the Neurological Classification of SCI
• * Medically stable with physician clearance
• * SCI due to non-progressive etiology
• * 20% impairment in maximal inspiratory or expiratory pressure generation, relative to normative values

Exclusion Criteria:

• * Current diagnosis of an additional neurologic condition such as Multiple Sclerosis, Parkinson disease, stroke, or brain injury
• * Severe illness or infection, including non-healing decubitus ulcers, untreated bladder or urinary tract infections, cardiovascular disease, lung disease, active heterotopic ossification, or uncontrolled hypertension
• * Severe neuropathic pain
• * Known pregnancy
• * Severe recurrent autonomic dysreflexia
• Exclusion for involvement in TMS - History of seizure disorder, uncontrolled migraines, presence of cardiac pacemaker, metal implants in skull, medications that lower seizure threshold.