呼吸共振频率是一种通过呼吸来最大化心率变异性的技术。这是一种因个体而异的技术，通过一个大约30分钟的程序来确定，通常最适合在专科医疗机构进行。对于癌症患者来说，这是一种身体和时间上的负担，因为需要前往医院进行测量，尤其是对于癌症患者而言。因此，如果能找到一种从患者的身体特征中确定共振频率的方法，而无需进行特殊评估程序，将是有益的。本探索性横断面研究旨在研究健康志愿者个体特征与共振频率之间的相关性。采用多元回归分析，以测得的共振频率为目标变量，个体特征参数为解释变量。研究目的是建立一个估算共振频率的模型，并评估其有效性。此外，还评估了该模型在不可治愈癌症患者中的适用性。共招募了122名健康志愿者和32名不可治愈癌症患者作为参与者。154名参与者的中位数共振频率为每分钟6个呼吸。男性和身高被选为与健康志愿者测得的共振频率相关的解释变量。使用个体特征进行共振频率估算的公式为男性为17.90-0.07×身高，女性为15.88-0.06×身高。男性的调整R平方值为0.55，女性为0.47。当不可治愈癌症患者测得的共振频率为每分钟六个呼吸或更少时，使用该公式估算的共振频率略大于测得值。个体特征信息，如性别和身高，可以方便获取，并且对于构建共振频率的估算公式非常有用。©2023. 作者。

Resonance frequency breathing is a technique that involves breathing that maximizes heart rate variability. It is specific to individuals and is determined through a procedure taking approximately 30 min, using a procedure that is often best carried out at specialized medical institutions. This is a physical and time-consuming burden because of hospital visits and measurements, particularly for patients with cancer. Therefore it would be beneficial if a procedure can be found to determine resonance frequency from the patient's physical characteristics, without the need for special assessment procedures. This exploratory cross-sectional study examined the correlation between individual characteristics and resonance frequency in healthy volunteers. Multiple regression analysis was performed with the measured resonance frequency as the target variable and individual characteristic parameters as explanatory variables. The study aims to build an estimation formula for resonance frequency with some of these parameters and assess its validity. In addition, the validity of the formula's applicability to patients with incurable cancers is assessed. A total of 122 healthy volunteers and 32 patients with incurable cancers were recruited as participants. The median resonance frequency of 154 participants was six breaths per min. Sex and height were selected as explanatory variables associated with the measured resonance frequency in the volunteers. The estimation formula for resonance frequency using individual characteristics was 17.90-0.07 × height for men and 15.88-0.06 × height for women. Adjusted R-squared values were 0.55 for men and 0.47 for women. When the measured resonance frequency in patients with incurable cancers was six breaths per minute or less, the resonance frequency estimated by this formula was slightly larger than the measured ones. Information on individual characteristics, such as sex and height, which can be easily obtained, was useful to construct an estimation formula for resonance frequency.© 2023. The Author(s).