Abdominal muscle training can enhance cough after spinal cord injury

Neurorehabil Neural Repair. Nov-Dec 2013;27(9):834-43. doi: 10.1177/1545968313496324. Epub 2013 Jul 24.

Abstract

Background: Respiratory complications in people with high-level spinal cord injury (SCI) are a major cause of morbidity and mortality, particularly because of a reduced ability to cough as a result of abdominal muscle paralysis.

Objective: . We investigated the effect of cough training combined with functional electrical stimulation (FES) over the abdominal muscles for 6 weeks to observe whether training could improve cough strength.

Methods: Fifteen SCI subjects (C4-T5) trained for 6 weeks, 5 days per week (5 sets of 10 coughs per day) in a randomized crossover design study. Subjects coughed voluntarily at the same time as a train of electrical stimulation was delivered over the abdominal muscles via posterolaterally positioned electrodes (50 Hz, 3 seconds). Measurements were made of esophageal (Pes) and gastric (Pga) expiratory pressures and the peak expiratory flow (PEFcough) produced at the 3 time points of before, during, and after the training.

Results: During voluntary coughs, FES cough stimulation improved Pga, Pes, and PEFcough acutely, 20-fold, 4-fold, and 50%, respectively. Six weeks of cough training significantly increased Pga (37.1 ± 2.0 to 46.5 ± 2.9 cm H2O), Pes (35.4 ± 2.7 to 48.1 ± 2.9 cm H2O), and PEFcough (3.1 ± 0.1 to 3.6 ± 0.1 L/s). Cough training also improved pressures and flow during voluntary unstimulated coughs.

Conclusions: FES of abdominal muscles acutely increases mechanical output in coughing in high-level SCI subjects. Six weeks of cough training further increases gastric and esophageal cough pressures and expiratory cough flow during stimulated cough maneuvers.

Keywords: abdominal muscle training; functional electrical stimulation; spinal cord injury; stimulated cough.

Publication types

  • Randomized Controlled Trial

MeSH terms

  • Abdominal Muscles / physiopathology*
  • Adult
  • Aged
  • Breathing Exercises*
  • Cervical Vertebrae
  • Combined Modality Therapy
  • Cough / etiology
  • Cough / physiopathology
  • Cough / therapy*
  • Cross-Over Studies
  • Electric Stimulation Therapy*
  • Humans
  • Male
  • Middle Aged
  • Recovery of Function
  • Spinal Cord Injuries / complications
  • Spinal Cord Injuries / rehabilitation*
  • Thoracic Vertebrae
  • Young Adult