Department of Orthopedic Surgery;
Akita Prefectural Center on Development and Disa- bility;
Akita;
Japan;
Department of Orthopedic Surgery;
Akita Red Cross Hospital;
Akita;
Japan;
Department of Orthopedic Surgery;
Akita University Graduate School of Medicine;
Akita;
Japan;
Iwai Orthopaedic Medical Hospital;
Tokyo;
Japan;
Spinal; Cord; Injury; Aminophylline; Heart; Rate; Variability; Autonomic; Nervous; System; Bradycardia;