1. Exercise‐induced bronchoconstriction assessed by a ratio of surface diaphragm EMG to tidal volume
- Author
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Lishuang Wang, Senrui Wu, Baiting He, Simin Liu, Shanfeng Liang, and Yuanming Luo
- Subjects
airway hyperresponsiveness ,asthma ,diaphragm electromyogram ,exercise‐induced bronchoconstriction ,Physiology ,QP1-981 - Abstract
Abstract Exercise‐induced bronchoconstriction (EIB) is usually assessed by changes in forced expiratory volume in 1 s (FEV1) which is effort dependent. The purpose of this study was to determine whether the diaphragm electromyogram (EMGdi) recorded from chest wall surface electrodes could be used to reflect changes in airway resistance during an exercise challenge test and to distinguish patients with EIB from those without EIB. Ninety participants with or without asthma history were included in the study. FEV1 was recorded before and 5, 10, 15, and 20 min after exercise. EIB was defined as an FEV1 decline greater than 10% after exercise. A ratio of root mean square of EMGdi to tidal volume (EMGdi/VT) was used to assess changes in airway resistance. Based on changes in FEV1, 25 of 90 participants exhibited EIB; the remainder were defined as non‐EIB participants. EMGdi/VT in EIB increased by 124% (19%–478%) which was significantly higher than that of 21% (−39% to 134%) in non‐EIB participants (p
- Published
- 2023
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