Efficacy of respiratory muscle training in improving pulmonary function and survival in patients with amyotrophic lateral sclerosis: a systematic review and meta-analysis.

This systematic review pulled together five randomized controlled trials involving 170 people with ALS to examine whether training the breathing muscles could help preserve lung function and strength. The researchers found that respiratory muscle training did improve the actual force people could generate when breathing in and out, particularly when measured as maximum expiratory and inspiratory pressures. However, the training did not appear to change overall lung volume measurements or quality of life scores in the way researchers had hoped.

One study hinted that inspiratory muscle training might play a role in predicting survival, though the authors were careful not to overstate this. No harmful effects were reported across any of the trials. The message here is measured but encouraging: respiratory muscle training shows promise as something to pair with standard ALS care, though the current research base is still fairly small.

Researchers looked at whether exercises designed to strengthen the muscles you use to breathe could help people with ALS maintain better lung function and live longer. They reviewed five studies involving about 170 people who either did breathing muscle training or received their usual care.

The good news is that the people who trained their breathing muscles did develop stronger muscles around their lungs, which was measured by how hard they could breathe in and out. However, the training did not lead to the bigger improvements in overall lung capacity that researchers were looking for, and it did not seem to change people's quality of life scores.

One study suggested that this type of training might be linked to survival, though that finding needs more investigation. The research shows this approach is safe, with no adverse effects reported, but it is still early days in understanding how much it can truly help.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This meta-analysis synthesizes a small but rigorous evidence base from five RCTs, revealing that respiratory muscle training produces measurable gains in respiratory muscle strength, particularly in maximum expiratory and inspiratory pressure metrics. The effect appears somewhat more focused on neuromuscular output than on lung volume expansion, as forced vital capacity showed no significant improvement.

Quality of life outcomes also did not shift significantly across the trials reviewed, which warrants acknowledgment when discussing realistic goals with patients. One trial flagged inspiratory muscle training as a potential survival predictor, though the abstract does not provide details on effect size or mechanism, so this remains suggestive rather than conclusive.

The safety profile is clean across all included studies. The evidence base is limited in scale, which means the findings support exploring respiratory muscle training as an adjunctive strategy within a comprehensive ALS management plan, but larger and longer-term studies would help clarify durability of benefit and any moderators of response.