Respiratory physiological mechanism of two types of equal-intensity inspiratory muscle training in stable patients with chronic obstructive pulmonary disease - 01/09/24
, Lili Guan b, Bingpeng Guo b, Yuqiong Yang b, Rongchang Chen b, ⁎ Abstract |
Purpose |
This study aimed to investigate the respiratory physiological changes resulting from short-term inspiratory resistance training (R-IMT) and inspiratory threshold training (T-IMT) in patients with chronic obstructive pulmonary disease (COPD) and to compare the mechanisms of the two training methods.
Patients and methods |
A total of 75 stable patients with COPD combined with inspiratory muscle weakness were randomly allocated to three groups: R-IMT (n = 26), T-IMT (n = 24), and control (n = 25). Before and after 8 weeks of inspiratory muscle training(IMT), cardiopulmonary exercise tests were conducted to assess respiratory patterns, respiratory central drive, exercise tolerance, and ventilation efficiency.
Results |
After 8 weeks of IMT, Inspiratory muscle strength, represented by MIP (maximum inspiratory mouth pressure) and exercise capacity increased during exercise in both IMT groups (P < 0.05). In the R-IMT group, inspiratory time (Ti) prolonged (P < 0.05), tidal volume (Vt) increased (P < 0.05), ventilation efficiency (represented by ventilation-center coupling) increased (P < 0.05) during exercise. Conversely, the T-IMT group did not exhibit any of these changes after IMT (P > 0.05).
Conclusion |
In summary, the improvement in exercise tolerance was associated with an increase in inspiratory muscle reserve in both R-IMT and T-IMT. However, only R-IMT was associated with deeper and slower breathing, as well as improved ventilation efficiency.
Le texte complet de cet article est disponible en PDF.Graphical abstract |
The changes of respiratory central drive (ventilation-respiratory central coupling) in resting and isometric exercise states before and after IMT in R-IMT group, T-IMT group and control group. Note: Ve/iEMGpara-ventilation-respiratory central coupling; L/uV.s-Lift/microvolts per second.
Highlights |
• | The enhancement of exercise tolerance subsequent to t-IMT and r-IMT is associated with the elevation of inspiratory muscle strength reserve. |
• | Nevertheless, the enhancement of exercise tolerance following r-IMT is also linked to deeper and slower breathing, as well as the enhancement of ventilation efficiency. |
Keywords : Threshold load training, Inspiratory resistive training, Respiratory central drive, Ventilation efficiency, COPD
Plan
Vol 232
Article 107747- octobre 2024 Retour au numéro
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