Inspiratory muscle training is a treatment used to help with breathing and coughing after spinal cord injury (SCI). This page introduces inspiratory muscle training and its use after SCI.
- People with thoracic and cervical SCI may experience problems with breathing caused by weakness or paralysis of some of the breathing muscles.
- Inspiratory muscle training involves breathing exercises using simple equipment to strengthen the muscles used to breathe in.
- There are three types of devices that can be used during training: resistive trainers, threshold trainers, and isocapneic hyperpneic trainers.
- Studies have shown that inspiratory muscle training increases the strength and endurance of the inspiratory muscles in people with SCI.
Inspiratory muscle training describes a number of different techniques in which simple equipment is used to strengthen the muscles used to breathe in (inspire). The equipment is used to make breathing in more challenging. This causes the breathing muscles to work harder, so that they can adapt and become stronger with training.
Speak with a health provider before using inspiratory muscle training to make sure it is safe and suitable for you and to learn how to use the equipment correctly.
Inspiratory muscle training is done using a device that makes breathing in more challenging. The device has some type of mechanism that creates resistance when the person breathes in, but allows breathing out to occur freely. There are several different types of inspiratory muscle training devices:
- Resistive trainers are the simplest trainers. They have a range of small diameter holes, which the person breathes in through. The smaller the hole, the greater the challenge is. The drawback of these trainers is that the resistance changes if you breathe in quickly or slowly.
- Threshold trainers have a spring-loaded valve that provides resistance. The valve can be adjusted for difficulty level. These trainers provide the same resistance if you breathe in quickly or slowly.
- Isocapneic hyperpnea involves a more complex device that allows breathing to be done at lower levels of resistance and higher flow rates. This device uses a rebreathing bag that helps maintain carbon dioxide levels in a normal range. This device uses targets to increase the intensity of breathing to a training level.
Your health provider will assist you with selecting an appropriate trainer and supervise your early training. The device is held to the mouth with a clip over the nose. Some people with reduced hand movement will need someone to position and hold the trainer during each training session. Alternatively, tilting the chair backwards or using a stand to hold the trainer may assist with positioning the mouthpiece independently.
Inspiratory muscle training involves regular sessions of breathing exercises consisting of a set number of breaths and sets. Sessions often last around 30 minutes and are done 2 to 3 times per day. However, the ideal protocol for inspiratory muscle training for people with SCI is not yet known.
Inspiratory muscle training is usually done for at least 6 weeks to allow enough time for the muscles to become stronger and adapt to training. Like other exercise, training should be continued regularly for strength to be maintained.
Cervical and thoracic spinal cord injuries can cause paralysis or weakness of muscles of the neck, chest, and abdomen that are important for breathing and coughing. This can cause breathing problems that can contribute to shortness of breath, fatigue, and a need for mechanical ventilation.
Depending on the level of injury of the SCI, some of the muscles of breathing may still be able to be controlled. In some cases, strengthening these muscles can help to compensate for weakness in other muscles and improve breathing ability.
Inspiratory muscle training is used to strengthen the muscles that can be controlled to improve independent breathing ability. It may also be used to help prevent medical complications related to breathing and coughing problems, such as lung infections like pneumonia.
There are certain situations where extra attention is needed to determine whether inspiratory muscle training is appropriate and safe. Consult a qualified health provider for further safety information.
Restrictions of precautions for using inspiratory muscle training may include:
- Unstable asthma
- Previous collapsed lung (pneumothorax) not caused by a traumatic injury
- Unhealed collapsed lung (pneumothorax) caused by a traumatic injury
- Presence of air bubbles near the membranes lining the lungs
- A low tolerance for shortness of breath
- A ruptured eardrum or other ear conditions
Inspiratory muscle training is generally safe when used appropriately (see above for a list of situations in which inspiratory muscle training may not be safe). However, it is important to seek advice from a health provider to determine if this treatment is the best option for you.
Some possible risks and side effects of using inspiratory muscle training may include:
- If breathing is done too rapidly, it could cause hyperventilation, leading to light headedness, dizziness, or fainting
- Muscle tiredness or soreness
- Increased muscle spasms
Several research studies have shown that inspiratory muscle training helps to improve breathing after spinal cord injury. Inspiratory muscle training was found to improve strength and endurance of the breathing muscles. As well, it may reduce shortness of breath and chest infections in some people with SCI. These findings are supported by moderate evidence from five studies and weak evidence from six studies.
Research on whether inspiratory muscle training is effective to help with speaking and coughing and what its long-term effects are is currently lacking.
Evidence for “How effective is inspiratory muscle training for people with SCI?” is based on the following studies:
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Postma K, Haisma JA, Hopman M, Bergen MP, Stam HJ, Bussmann JB. Resistive inspiratory muscle training in people with spinal cord injury during inpatient rehabilitation: a randomized controlled trial. Phys Ther 2014; 94(12): 1709-1719.
McConnell A. Respiratory muscle training: theory and practice. London: Churchill Livingston; 2013. Chapter 6, Implementing respiratory muscle training; p.149-173.
Berlowitz DJ, Tamplin J. Respiratory muscle training for cervical spinal cord injury. Cochrane Database of Syst Rev 2013, 7: CD008507.
Spungen AM, Grimm DR, Lesser M, Bauman WA, Almenoff PL. Self-reported prevalence of pulmonary symptoms in subjects with spinal cord injury. Spinal Cord 1997; 35: 652-657,
Reid WD, Geddes EL, Brooks D, O’Brien K, Crowe J. Inspiratory muscle training in chronic obstructive pulmonary disease. Special Series on Skeletal Muscle Training. Physiotherapy Canada 2004; 56:128-142.
Geddes EL, Reid WD, Brooks D, Crowe J, O’Brien K. A Primer on Inspiratory Muscle Trainers. Buyers Guide for the European Respiratory Society 2006.
Geddes EL, Reid WD, Crowe J., O’Brien K, Brooks D. Inspiratory muscle training in adults with chronic obstructive pulmonary disease: A systematic review. Respir Med 2005; 99: 1440-1458.
Sheel AW, Reid WD, Townson AF, Ayas NT, Konnyu KJ. Effects of exercise training and inspiratory muscle training in spinal cord injury: a systematic review. J Spinal Cord Med 2008; 31(5): 500-8.