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Test of Respiratory Endurance (TIRE)

The Test of Respiratory Endurance (TIRE) is an innovative method for the functional assessment and training of respiratory muscles. It enables objective evaluation of the endurance and performance of both inspiratory and expiratory muscle groups. Originally designed for detailed analysis of inspiratory function, advances in measurement technology have extended its application to expiratory function as well. This development allows for a more comprehensive assessment of respiratory mechanics, with potential applications in diagnostics, clinical research, and respiratory physiotherapy.

Recent evidence suggests that SMIP and SMEP are more sensitive than conventional static pressure tests and may serve as valuable tools for diagnosing disease, monitoring the effectiveness of respiratory rehabilitation, and assessing disease progression in pulmonary and neuromuscular conditions. The TIRE protocol can also be applied therapeutically, either as part of respiratory physiotherapy or as an adjunct to athletic training. Current research focuses on establishing normative reference values in healthy populations, evaluating its integration into training and therapy for individuals with various conditions, and comparing its efficacy with other established assessment and training modalities.

Principal outcome variables

SMIP

Sustained Maximal Inspiratory Pressure (PTU) — sustained inspiratory strength over the entire inspiratory maneuver.

SMEP

Sustained Maximal Expiratory Pressure (PTU) — the ability of expiratory muscles to generate and maintain maximal pressure throughout forced expiration.

Why it matters

SMIP and SMEP are more sensitive than conventional static pressure tests in some contexts and can support diagnosis, monitoring and rehabilitation planning.