Physical Education Department, Associated Postgraduate Program in Physical Education, Universidade de Pernambuco and Universidade Federal da Paraíba, Recife, Brazil.
Allergology and Clinical Immunology Department, Center for Research in Allergy and Clinical Immunology, Clinical Hospital, Federal University of Pernambuco, Recife, Brazil.
Clin Physiol Funct Imaging. 2024 Jul;44(4):324-331. doi: 10.1111/cpf.12878. Epub 2024 Mar 27.
To compare the thermographic pattern of regions of interest (ROI) of respiratory muscles in young asthmatics with and without bronchospasm induced by eucapnic voluntary hyperpnea (EVH).
Cross-sectional study carried out with 55 young (55% male and 45% females) aged 12.5 ± 3.3 years, divided in nine nonasthmatics, 22 asthmatics without exercise-induced bronchospasm compatible response (EIB-cr) and 24 asthmatics with EIB-cr. The diagnosis of EIB was given to subjects with a fall in forced expiratory volume in the first second (FEV) ≥ 10% compared to baseline. Thermographic recordings of respiratory muscles were delimited in ROI of the sternocleidomastoid (SCM), pectoral, and rectus abdominis intention area. Thermal captures and FEV were taken before and 5, 10, 15 and 30 min after EVH.
Twenty-four (52.1%) of asthmatics had EIB-cr. There was a decrease in temperature at 10 min after EVH test in the SCM, pectoral and rectus abdominis ROIs in all groups (both with p < 0.05). There was a decrease in temperature (% basal) in asthmatic with EIB-cr compared to nonasthmatics in the rectus abdominis area (p < 0.05).
There was a decrease in temperature in the ROIs of different muscle groups, especially in asthmatics. The greater drop in FEV observed in individuals with EIB-cr was initially associated with a decrease in skin temperature, with a difference between the nonasthmatics in the abdominal muscle area. It is likely that this decrease in temperature occurred due to a temporary displacement of blood flow to the most used muscle groups, with a decrease in the region of the skin evaluated in the thermography.
比较喘息发作的年轻哮喘患者和无喘息发作的年轻哮喘患者在接受呼气相呼吸努力（EVH）时呼吸肌感兴趣区（ROI）的热图模式。
这是一项横断面研究，共纳入 55 名年轻受试者（55%为男性，45%为女性），年龄 12.5±3.3 岁，分为非哮喘组 9 名、无运动诱导支气管痉挛（EIB-cr）的哮喘组 22 名和有 EIB-cr 的哮喘组 24 名。EIB 的诊断标准为用力呼气量（FEV）在第一秒的下降率≥基线的 10%。对胸锁乳突肌（SCM）、胸大肌和腹直肌意向区的呼吸肌进行热图记录。在 EVH 前、后 5、10、15 和 30 分钟进行热捕获和 FEV 测量。
24 名（52.1%）哮喘患者有 EIB-cr。在 EVH 试验后 10 分钟，所有组的 SCM、胸大肌和腹直肌 ROI 温度均下降（均 p<0.05）。与非哮喘组相比，有 EIB-cr 的哮喘患者在腹直肌 ROI 的温度（%基础值）下降（p<0.05）。
不同肌肉群的 ROI 温度均下降，尤其是在哮喘患者中。EIB-cr 患者的 FEV 下降幅度更大，这与皮肤温度下降有关，在腹直肌区，非哮喘患者的皮肤温度存在差异。皮肤温度下降可能是由于暂时将血流转移到最常用的肌肉群，导致热成像评估区域的皮肤温度下降。
