What this means
In one test, a phone app that showed live muscle signals led to stronger muscle work during breathing exercises. This was a single short session, so it does not show lasting benefits or effects on coughing or swallowing.
Plain-English summary written by an AI model from the abstract. The original is below.
- Who it was tested in
- 19 adults with Parkinson's disease
- Kind of research
- A clinical trial in people
The science
- Original title
- Visual feedback increases expiratory muscle training effort in Parkinson's disease: a randomised crossover trial.
- Authors
- Srp M, Dvorakova K, Muzik J et al.
- Journal
- Journal of neuroengineering and rehabilitation
- Published
- Oct 16, 2026
- Study type
- Clinical trial · in humans
- PMID
- 42881452 ↗
Abstract
Background
Disorders of airway protection, including impaired cough and swallowing, are clinically important complications of Parkinson's disease. Expiratory muscle strength training (EMST) is an established non-pharmacological intervention targeting these deficits. The aim of this study was to evaluate the acute effect of visual feedback provided by the SpiroGym mHealth app on expiratory muscle activation during EMST in people with Parkinson's disease.
What they did
We conducted a single-center, randomised, two-period crossover trial in people with Parkinson's disease. Participants performed EMST under two conditions, in randomised order: conventional EMST without visual feedback and EMST with real-time visual feedback provided by the SpiroGym app. Expiratory muscle activation was measured using surface electromyography of the abdominal muscles. The primary outcome was the within-participant difference in mean peak normalised internal oblique activity between conditions. Secondary outcomes included external oblique and rectus abdominis activity, associations with neuropsychiatric symptoms, and participant-reported usability ratings.
What they found
Twenty participants were randomised, and 19 completed the study and were included in the final analysis. No study-related adverse events occurred. Visual feedback significantly increased mean peak normalised internal oblique activity compared with no feedback (118.2 ± 36.4% vs. 90.5 ± 23.0% of reference voluntary contraction; p < 0.001; Cohen d = 0.95). Without feedback, internal oblique activation significantly declined from 100.1 ± 22.2% in the first set to 84.4 ± 25.5% in the fifth set, whereas it remained stable with feedback (120.3 ± 29.4% to 119.9 ± 40.6%). External oblique activation was also significantly higher with feedback (122.2 ± 38.1% vs. 100.9 ± 32.4%; p = 0.002; Cohen d = 0.66), while rectus abdominis activation did not differ significantly between conditions (105.2 ± 41.3% vs. 90.2 ± 36.1%; p = 0.06; Cohen d = 0.43). No significant associations between feedback responsiveness and depression, apathy, or anxiety were detected. Participants rated the visual feedback as easy to understand and helpful for EMST performance. Real-time visual feedback delivered by the SpiroGym app acutely increased and stabilized expiratory muscle activation during EMST in people with Parkinson's disease. Trial registration ClinicalTrials.gov NCT06942533, 1 May 2025.
The authors' abstract, grouped under plain headings from its own section labels.
Srp M, Dvorakova K, Muzik J et al. Visual feedback increases expiratory muscle training effort in Parkinson's disease: a randomised crossover trial. Journal of neuroengineering and rehabilitation. 2026. doi:10.1186/s12984-026-02104-5. PMID: 42881452. https://pubmed.ncbi.nlm.nih.gov/42881452/
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