To address these problems, alternative methods including respiratory magnetometry 6, respiratory inductive plethysmography 7 and optoelectronic plethysmography (OEP) have been developed 8. Thus, thoraco-abdominal asynchrony (TAA), non-parallel motion, or even opposing movement of the rib cage (RC) and the abdomen (ABD) during respiration, which may occur after chest surgery and in asthma, COPD, and neuromuscular disorders, cannot be identified 5. Third, it cannot detect compartmental movement of the chest wall. Second, it may cause infection through microorganism transfer via mouthpiece 3, 4. First, participants who cannot follow instructions such as infants, patients with dementia and confusional state, and those in critical condition are not qualified because spirometry requires effort and cooperation. However, this technique has several limitations. Moreover, it is utilized in different situations including screening of general respiratory health diagnosis and validation of severity of respiratory diseases such as asthma, chronic obstructive pulmonary disease (COPD), and interstitial lung disease preoperative risk assessment and monitoring of therapeutic intervention 1, 2. Spirometry is the standard method for assessing pulmonary function. These findings suggest that this technique could examine chest wall motion, and may be effective in analyzing chest wall volume changes and pulmonary function.
Moreover, the MCO method could detect regional rib cage and abdomen compartment contributions and could assess TA asynchrony, indicating almost complete synchronous movement (phase angle for each compartment: − 5.05° to 3.86°).
A significant positive correlation was observed between the vital capacity (Spearman’s ρ = 0.68, p < 0.0001), forced vital capacity (Spearman’s ρ = 0.62, p < 0.0001), and tidal volume (Spearman’s ρ = 0.61, p < 0.0001) of spirometry and the counterpart parameters of MCO method.
We recruited 48 male participants, and all underwent spirometry and chest wall motion measurement with the MCO method. In this study, the MCO method was applied to examine thoraco-abdominal (TA) wall motion for assessing pulmonary function. A three-dimensional motion capture system using the one-pitch phase analysis (MCO) method can facilitate high precision measurement of moving objects in real-time in a non-contacting manner. However, its use is challenging in some patients, and it has limitations such as risk of infection and inability to assess regional chest wall motion. Spirometry is a standard method for assessing lung function.
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