Changes in Respiratory Muscle Activity during Repeated Measurements of Maximal Inspiratory Pressure

KANEKO Hideo, NAGAI Yoshiharu, YOSHIZUMI Kohei

doi:10.1589/rika.25.487

[Purpose] The purpose of this study was to clarify changes in diaphragm activity and abdominal muscle activity during repeated measurements of maximal inspiratory pressure (PImax) that lead to an increase in PImax. [Methods] Eleven healthy male subjects underwent 20 PImax and 3 maximal expirator pressure (PEmax) measurements. Electromyography of the diaphragm and abdominal muscles (rectus abdominis, external oblique, internal oblique) were recorded by surface EMG during PImax and PEmax measurement. Short PImax (average of the first 3 highest values with <5% variability) and long PImax (average of the 3 highest values with <5% variability from all recorded measurement) were determined, and these PImax and the root-mean-square (RMS) amplitude of each muscle were compared. [Results] Compared to short PImax period, the long PImax and diaphragm RMS amplitude in the long PImax period were significantly increased. The RMS amplitude of abdominal muscles showed no significant increases, but the coefficient of variation of the internal oblique muscle RMS amplitude decreased. There was a significant negative correlation between the percentage of the RMS amplitude relative to PEmax in the short PImax period and the ratio of changes in RMS amplitudes for long PImax and short PImax. [Conclusion] The results suggest that increased PImax during repeated measurement is derived from not only an increase of diaphragm recruitment but also control of internal oblique muscle recruitment.<br>

Changes in Respiratory Muscle Activity during Repeated Measurements of Maximal Inspiratory Pressure

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