シート状ストレッチセンサを用いた胸郭運動の計測機器の開発

Development of a Measurement Device Using a Sheet Stretch Sensor for Chest Wall Motion

要旨

目的：呼吸リハビリテーションのための簡便で非侵襲的に胸郭運動を計測するストレッチセンサ（STR）が開発された．本研究の目的は，STRによる胸郭運動計測の妥当性を検討することである．

方法：健常成人男性12名が立位姿勢で3つのセンサ〔STR，インダクタンス式呼吸プレチスモグラフィー（RIP），スパイロメーター（FLOW）〕を装着し，4つの呼吸様式（自然呼吸：120秒，深呼吸：60秒，頻呼吸：60秒，無呼吸：60秒）での胸郭運動を計測した．STRはバンドとして胸部と腹部に装着した．各センサの胸郭運動計測について分析した．

結果：STRの出力はFLOWおよびRIPと有意な相関を示した（r＝0.50〜1.00，p＜0.05）．STRから得た呼吸回数はFLOWから得た実測値と差を認めなかった（p＞0.05）．STR出力は呼吸様式によって有意に変化していた（無呼吸＜頻呼吸＜自然呼吸＜深呼吸，p＜0.05）．

結論：STRは健常若年健常者におけるさまざまな呼吸条件において胸郭運動を計測することができる．

Purpose：A new simple and noninvasive stretch sensor (STR) has been developed to detect chest wall motion for respiratory rehabilitation. The purpose of this study was to investigate the validity of chest wall motion measurements obtained using the new stretch sensor.

Methods：Twelve healthy male volunteers wore three different sensors (STR, respiratory inductance plethysmography [RIP], and flowmeter) while they performed the testing protocol, which included natural breathing (120 s), deep breathing (60 s), and polypneic (60 s) and apneic (30 s) conditions in the upright stance. The STR was implemented in two bands for the participant's chest and abdominal measurements. The ability of the three sensors to measure respiration and chest wall motion was analyzed.

Results：The output signals from the STR showed significant correlation with the flow and RIP signals (r＝0.5-1.00, p＜0.05). The total number of breaths obtained from the STR signals showed no significant difference from the reference values obtained from the flowmeter signals (p＞0.05). The amplitude of the STR output signals changed significantly according to the respiratory maneuver used. Specifically, it increased from apnea, polypnea, and natural breathing to deep breathing (p＜0.05).

Conclusion：The newly developed stretch sensor is capable of measuring chest wall motion in various breathing maneuvers in young men.