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

A team of researchers looked at whether respiratory muscle training, a form of exercise that strengthens the muscles you use to breathe, could help people with ALS. They searched for high-quality studies and found five randomized controlled trials involving 170 people. The training did improve how strongly people could breathe in and out, which is a specific measure of respiratory muscle power.

However, it did not significantly improve overall lung function as measured by standard tests, nor did it change quality of life scores in the studies they reviewed. One study suggested that inspiratory muscle training, which specifically targets the muscles used for breathing in, might help predict survival. The work points to respiratory muscle training as a potentially useful addition to standard care, though the evidence base remains modest and more research is needed.

Researchers wanted to know whether exercises that strengthen your breathing muscles could help people living with ALS. They reviewed five carefully designed studies that involved about 170 people total.

The good news is that these breathing exercises did seem to make the muscles involved in breathing stronger, which was measurable through tests. However, the studies did not find that the exercises changed overall lung function or made people feel better in terms of daily quality of life.

One study found an interesting link between breathing muscle training and survival, though this was just one observation and needs further investigation. No harmful side effects were reported in any of the studies reviewed.

The research suggests these exercises may be worth exploring as part of your overall care plan, though there is still much to learn.

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

This systematic review synthesizes five RCTs and offers a balanced picture of respiratory muscle training's effects in ALS. The clearest finding is an improvement in volitional respiratory muscle strength, particularly maximum expiratory and inspiratory pressures, a measure that is relatively direct and objective.

Importantly, the meta-analysis found no significant change in forced vital capacity, a standard pulmonary function measure, which suggests that the effect is specific to muscle strength rather than broad changes in lung mechanics. Quality of life outcomes also showed no significant difference between intervention and control groups across the included studies.

The observation that inspiratory muscle training may act as a survival predictor is intriguing but comes from a single study within this small literature, so it warrants caution in interpretation. The absence of reported adverse events is reassuring for clinical application.

The evidence base remains limited in volume and sample size, so the strength of recommendation is appropriately modest.