Steel Harry, Pollock Sean, Lee Danny, Keall Paul, Kim Taeho
Department of Physics, University of Sydney, Sydney, NSW, 2006, Australia.
Australas Phys Eng Sci Med. 2014 Mar;37(1):97-102. doi: 10.1007/s13246-014-0247-z. Epub 2014 Feb 8.
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.
本研究评估了视听（AV）生物反馈因其对自然呼吸的交互式干预，是否会导致外部和内部相关性水平的变化。分析了15名健康人类受试者在AV生物反馈和自由呼吸（FB）状态下的内部（膈肌）和外部（腹壁）呼吸运动信号，并进行了相关性和规律性测量。获得了规律性指标（均方根误差和频谱功率离散指标），并研究了这些指标与内部和外部相关性之间的关系。对于FB和AV生物反馈辅助呼吸，内部和外部呼吸运动之间的平均相关性分别为0.96±0.02和0.96±0.03。这意味着没有证据表明（p值=0.88）使用AV生物反馈时内部和外部呼吸运动之间的相关性存在任何差异。我们的结果证实了这一假设，即AV生物反馈的内部-外部相关性与自由呼吸时相同。如果患者能保持这种相关性，那么AV生物反馈就可以在临床上放心使用，因为使用带有外部信号的AV生物反馈改善规律性将反映为内部运动规律性的增加。
