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TrueForce: a new digital manometer to measure maximal respiratory pressures at functional residual capacity

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Abstract

Purpose

This study aimed to develop a digital manometer capable of measuring the maximal respiratory pressures at functional residual capacity level—pulmonary volume where the pressures related to the elastic recoil of the respiratory system are minimized—and to validate its functionally in healthy individuals.

Methods

The proposed device was built based on three main components: the hardware, electronic part; the firmware, computational part; and the mechanics, composed of the device housing, connections, and filters used. Also, the software was updated to allow measurements at functional residual capacity. Functional validation was performed with 30 healthy individuals (15 men), aged between 20 and 40 years. The intraclass correlation coefficient (ICC) verified concurrent validity and test-retest reliability reproducibility, and pressures at functional residual capacity were compared to pressures at residual volume and total lung pulmonary capacity, by paired t test.

Results

The developed device met the desired functional and non-functional requirements. The volume calculated from the acquired flow values showed variability of less than 2%. There was total agreement between the expected and obtained pressures. Regarding functional validation, an ICC ≥ 0.84; p < 0.001 was observed for both concurrent validity and test-retest reliability. Measurements at functional residual capacity were significantly lower than measurements performed at residual volume and total lung capacity (p < 0.05).

Conclusion

The TrueForce can be considered a valid and reliable instrument for measures of maximum respiratory pressures performed in the functional residual capacity, and it can be used in clinical trial research.

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Authors and Affiliations

  1. Electrical Engineering Program, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil

    Manoel Carlos Barbosa Pereira

  2. Rehabilitation Sciences Program, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil

    Bruna Mara Franco Silveira & Hugo Leonardo Alves Pereira

  3. Department of Physiotherapy, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil

    Verônica Franco Parreira

  4. Department of Electrical Engineering, Engineering School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil

    Henrique Resende Martins

Authors
  1. Manoel Carlos Barbosa Pereira
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  2. Bruna Mara Franco Silveira
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  3. Hugo Leonardo Alves Pereira
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  4. Verônica Franco Parreira
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  5. Henrique Resende Martins
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Correspondence to Henrique Resende Martins.

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Pereira, M.C.B., Silveira, B.M.F., Pereira, H.L.A. et al. TrueForce: a new digital manometer to measure maximal respiratory pressures at functional residual capacity. Res. Biomed. Eng. 37, 181–191 (2021). https://doi.org/10.1007/s42600-021-00139-2

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  • DOI: https://doi.org/10.1007/s42600-021-00139-2

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