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The internal–external respiratory motion correlation is unaffected by audiovisual biofeedback

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Abstract

This study evaluated if an audiovisual (AV) biofeedback causes variation in the level of external and internal correlation due to its interactive intervention in natural breathing. The internal (diaphragm) and external (abdominal wall) respiratory motion signals of 15 healthy human subjects under AV biofeedback and free breathing (FB) were analyzed and measures of correlation and regularity taken. Regularity metrics (root mean square error and spectral power dispersion metric) were obtained and the correlation between these metrics and the internal and external correlation was investigated. For FB and AV biofeedback assisted breathing the mean correlations found between internal and external respiratory motion were 0.96 ± 0.02 and 0.96 ± 0.03, respectively. This means there is no evidence to suggest (p-value = 0.88) any difference in the correlation between internal and external respiratory motion with the use of AV biofeedback. Our results confirmed the hypothesis that the internal–external correlation with AV biofeedback is the same as for free breathing. Should this correlation be maintained for patients, AV biofeedback can be implemented in the clinic with confidence as regularity improvements using AV biofeedback with an external signal will be reflected in increased internal motion regularity.

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Acknowledgments

This work was supported by Sydney Medical School New Staff/Early Career Researcher Scheme grant, NIH/NCI R01CA93626 and an NHMRC Australia Fellowship.

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Authors and Affiliations

  1. Department of Physics, University of Sydney, Sydney, NSW, 2006, Australia

    Harry Steel

  2. Radiation Physics Laboratory, Sydney Medical School, University of Sydney, Sydney, NSW, 2006, Australia

    Sean Pollock, Danny Lee, Paul Keall & Taeho Kim

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  1. Harry Steel
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  2. Sean Pollock
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  3. Danny Lee
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  4. Paul Keall
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  5. Taeho Kim
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Correspondence to Taeho Kim.

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Steel, H., Pollock, S., Lee, D. et al. The internal–external respiratory motion correlation is unaffected by audiovisual biofeedback. Australas Phys Eng Sci Med 37, 97–102 (2014). https://doi.org/10.1007/s13246-014-0247-z

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  • DOI: https://doi.org/10.1007/s13246-014-0247-z

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