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Updated: Mar 6, 2026
Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression
Published on: December 10, 2014
Clinimetric properties of the pressure biofeedback unit method for estimating respiratory pressures
Ana Paula da Silva1, Rayele Pricila Moreira Dos Santos1, Patrícia Chaves Coertjens1
1a Health Sciences Center, College of Physiotherapy , Federal University of Piauí , Parnaíba , PI , Brazil.
Objective:
The Pressure Biofeedback Unit (PBU) is used to assess the transversus abdominis muscle activity in order to determine the effectiveness of segmental stabilization, but not to verify its accuracy for measuring the pressure values of breathing from transversus abdominis activation. The objective of this study was to cross-validate the PBU pressure evaluated in transversus abdominis muscle activation with the respiratory pressure assessed through manovacuometry in order to verify the extent to which the PBU can be used to indirectly evaluate the strength of the respiratory muscle in both men and women and verify the reliability of the methods.
Participants:
A total of 39 healthy subjects.
Methods:
Manovacuometry and Pressure Biofeedback Unit tests were performed in three days each with three replications: 1) Maximal Inspiratory Pressure; 2) Maximal Expiratory Pressure; and 3) Pressure Biofeedback Unit.
Results:
Both tests showed good reliability and low correlation between the Pressure Biofeedback Unit and Maximal Inspiratory Pressure (r = 0.40; p = 0.01) and Maximal Expiratory Pressure (r = 0.33; p = 0.04). High differences were observed between pressures and wide limits of agreement in Bland-Altman analysis.
Conclusion:
It seems that the Pressure Biofeedback Unit is not able to effectively predict the respiratory muscles' strength as routinely evaluated through the use of the manovacuometry presenting a low cross-validation and good reliability.
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