The Flow-Pressure and Cardiopulmonary Responses of Manual Chest Percussion with Different Ranges of Oscillation Frequency in Healthy Subjects
DOI:
https://doi.org/10.48048/tis.2024.7345Keywords:
Manual percussion, Chest physical therapy, Airway clearance technique, Convention chest physical therapy, Bronchial hygiene therapyAbstract
Manual chest wall percussion (MP) is a technique for secretion clearance which commonly use. However, MP is performed by physiotherapists throughout a broad range of the oscillation frequency, which might result in different physical properties and cardiopulmonary responses of MP. Investigate the flow, pressure and cardiorespiratory response during MP with 3 frequencies in healthy subjects. Twenty-one healthy subjects (8 men and 13 women) were recruited into this crossover study. MP was applied with 3 frequency ranges, including low (4.0 ± 0.5), medium (5.5 ± 0.5), and high (6.5 ± 0.5) Hz, for 3 min in the neutral side lying on left side. A flow sensor (Model SS11LA) and a pressure sensor (Model SS13L) were used to measure Inspiratory-expiratory (I-E) flow rate and pressure through mouth. A bedside monitor (BSM 2351k, Nihon Kohden) was used to measure cardiopulmonary response. All dependent variables were measured pre- (resting), during, and post- (recovery) MP application. Both I-E flow rate and pressure were increased from resting significantly in all frequencies MP, but they were not different among the 3 frequency ranges. The E flow rate was increased to 0.41 - 0.44, 0.49 - 0.52 and 0.41 - 0.49 L/s (min-max) during MP application at low, medium, and high frequency compared to resting (0.31 - 0.36 L/s), respectively. The E pressure was increased to 0.40 - 0.41, 0.44 - 0.47 and 0.39 - 0.47 cmH2O (min-max) during MP application at low, medium, and high frequency compared to resting (0.20 - 0.22 cm H2O), respectively. However, the increment of the 3 frequency ranges did not affect the cardiovascular functions except respiratory rate, which was increased only 2 breaths/min from resting. In conclusion, airflow and pressure were slightly increased during MP but did not affect cardiopulmonary functions in healthy subjects. Further study in patients is needed.
HIGHLIGHTS
- Manual chest wall percussion is a secretion clearance technique which commonly used.
- Whether manual chest wall percussion frequency is capable of increasing expiratory flow rate by the same amount.
- The percussion force might be the most prominent factor affecting the expiratory flow rate.
- The frequency of chest wall percussion does not affect cardiovascular response.
- Medium and high frequencies cause a minor rise in the respiratory rate but have no impact on minute ventilation.
GRAPHICAL ABSTRACT

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