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Previous issue date: 2011-08-29 === Objectives: To evaluate how to develop dynamic hyperinflation (DH) during exercise, the influence of pursed-lip breathing in (PLB) on breathing pattern and operating volume in patients with asthma. Methods: We studied 12 asthmatic patients in three moments: (1) anthropometry and spirometry, (2) submaximal
incremental cycle ergometer test in spontaneous breathing and (3), submaximal incremental test on a cycle ergometer with PLB using the Opto-electronic plethysmography. Results: Evaluating the end-expiratory lung volume (EEV) during submaximal incremental test in spontaneous breathing, patients were divided into euvolume and hyperinflated. The RFL has increased significantly, the variation of the EEV group euvolume (1.4L) and decreased in group hyperinflated (0.272L). In group
volume observed a significant increase of 140% in Vt at baseline, before exercise, comparing the RFL and spontaneous breathing. Hyperinflated group was observed that the RFL induced significant increases of Vt at all times of the test incremental
baseline, 50%, 100% load and 66% recovery, 250%, 61.5% and 66% respectively. Respiratory rate decreased significantly with PLB at all times of the submaximal incremental test in the group euvolume. The speed of shortening of inspiratory muscles (VtRcp/Ti) in the hyperinflated increased from 1.6 ? 0.8L/s vs. 2.55 ? 0.9L/s, whereas in the RFL euvolume group ranged from 0.72 ? 0.31L/s vs. 0.65 ? 0.2L/s. The velocity of shortening of the expiratory muscles (VtAb/Te) showed similarity in
response to RFL. In group hyperinflated varied vs. 0.89 ? 0.47 vs. 0.80 ? 0.36 and ? 1.17 ? 1L vs. 0.78 ? 0.6 for group euvolume. Conclusion: Different behavior in relation to EEV in patients with moderate asthma were observed, the HD and
decreased EEV in response to exercise. The breathing pattern was modulated by both RFL performance as at home, making it more efficient === Objetivos: Avaliar como se desenvolve a hiperinsufla??o din?mica (HD) e as poss?veis modifica??es dos volumes pulonares operacionais durante o exerc?cio em respira??o espont?nea e respira??o em freno-labial (RFL) em pacientes asm?ticos.
M?todos: Foram avaliados 12 pacientes asm?ticos em 3 momentos: (1) antropometria e espirometria, (2) teste incremental subm?ximo no cicloerg?metro em
respira??o espont?nea e (3), teste incremental subm?ximo no cicloerg?metro com RFL utilizando a Pletismografia Opto-eletr?nica. Resultados: Avaliando o volume
pulmonar expirat?rio final (EEV) durante o teste incremental subm?ximo em respira??o espont?nea, os pacientes foram divididos em grupo euvolume e grupo hiperinsuflado. A RFL aumentou, significativamente, a varia??o do EEV no grupo
euvolume (1.4L) e diminuiu (0.272L) no grupo hiperinsuflado. No grupo euvolume observou-se aumento significativo de 140% no Vt na situa??o basal, pr?-exerc?cio, comparando a RFL e a respira??o espont?nea. No grupo hiperinsuflado foi
observado que a RFL induziu aumentos significativos do Vt em todos os momentos do teste incremental, basal, 50%, 100% da carga e recupera??o em 66%, 250%, 61.5% e 66% respectivamente. A frequ?ncia respirat?ria diminuiu significativamente com a RFL em todos os momentos do teste incremental subm?ximo no grupo euvolume. A velocidade encurtamento dos m?sculos inspirat?rios (VtRcp/Ti) no
grupo hiperinsuflado aumentou de 1.6 ? 0.8L/s vs. 2.55 ? 0.9L/s, com a RFL enquanto que no grupo euvolume variou de 0.72 ? 0.31L/s vs. 0.65 ? 0.2 L/s. A velocidade de encurtamento dos m?sculos expirat?rios (VtAb/Te) demonstrou similaridade em resposta a RFL. No grupo hiperinsuflado variou 0.89 ? 0.47 vs. 0.80 ? 0.36 e no grupo euvolume em 1.17 ? 1L vs. 0.78 ? 0.6. Conclus?o: Diferentes comportamentos em rela??o ao EEV nos pacientes com asma moderada foram observados, a HD e diminui??o do EEV em resposta ao exerc?cio. O padr?o
respirat?rio foi modulado pela RFL tanto em exerc?cio como no repouso, tornando-o mais eficiente
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