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. 2020 Jul 13;15:1697–1711. doi: 10.2147/COPD.S260735

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© 2020 Yamamoto et al.

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Results of Spearman’s rank correlation coefficient and univariate analyses of the correlation between inspiratory resonant frequency (Fres-ins) at rest and ventilatory parameters of cardiopulmonary exercise testing (CPET) at peak exercise (n=55).Interaction analyses were performed for Fres-ins and natural logarithms of exertional ventilatory parameters of CPET. All the analyses were statistically significant (p<0.01). (A) Fres-ins and expiratory tidal volume (V_T ex). (B) Fres-ins and mean expiratory flow (V_T ex/Te). (C) Fres-ins and minute ventilation (V’_E). (D) Fres-ins and oxygen uptake (V’_O2).

Abbreviations: β, unstandardized regression coefficient estimate; CPET, cardiopulmonary exercise testing; Fres-ins, inspiratory resonant frequency; R², R-squared; V’_E, minute ventilation; V’_O2, oxygen uptake; V_T ex, expiratory tidal volume; V_T ex/Te, mean expiratory flow.