Respiratory muscles's thermographic analysis in asthmatic youth with and without bronchospasm induced by eucapnic voluntary hyperpnea

Camila M de A Santos; Polyanna G C Quirino; José Â Rizzo; Décio Medeiros; José J de A Ferreira; Manoel da C Costa; Nádia Gaua; Bayne Freya; Marcelle de O Martins; Marco A C V Junior

doi:10.1111/cpf.12878

Respiratory muscles's thermographic analysis in asthmatic youth with and without bronchospasm induced by eucapnic voluntary hyperpnea

Clin Physiol Funct Imaging. 2024 Mar 27. doi: 10.1111/cpf.12878. Online ahead of print.

Authors

Camila M de A Santos^{1

2}, Polyanna G C Quirino^{1

2}, José Â Rizzo^{2

3}, Décio Medeiros^{2

3}, José J de A Ferreira⁴, Manoel da C Costa¹, Nádia Gaua⁵, Bayne Freya⁵, Marcelle de O Martins¹, Marco A C V Junior^{1

2

6}

Affiliations

¹ Physical Education Department, Associated Postgraduate Program in Physical Education, Universidade de Pernambuco and Universidade Federal da Paraíba, Recife, Brazil.
² Allergology and Clinical Immunology Department, Center for Research in Allergy and Clinical Immunology, Clinical Hospital, Federal University of Pernambuco, Recife, Brazil.
³ Medicine Department, Child and Adolescent Health Postgraduate Course, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
⁴ Physiotherapy Department, Universidade Federal da Paraíba, Recife, Brazil.
⁵ Sport and Exercise Science Department, Exercise Science Research Centre, School of Applied Sciences, London South Bank University, London, UK.
⁶ Department of Dentistry, Hebiatrics Postgraduation Program, Universidade de Pernambuco, Recife, Pernambuco, Brazil.

PMID: 38544320
DOI: 10.1111/cpf.12878

Abstract

Objective: 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).

Materials and methods: 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 (FEV₁) ≥ 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 FEV₁ were taken before and 5, 10, 15 and 30 min after EVH.

Results: 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).

Conclusion: There was a decrease in temperature in the ROIs of different muscle groups, especially in asthmatics. The greater drop in FEV₁ 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.

Keywords: asthma; bronchial hyperreactivity; exercise‐induced bronchospasm; thermal imaging; thermography.