Source: Annual Congress 2002 - Physiotherapy: assessment and outcome in healthy subjects and patients with chronic lung disease
Disease area: Airway diseases

Abstract

INTRODUCTION: THRESHOLD® trainer is a spring-loaded system that can be used as a test of inspiratory muscle endurance by the incremental threshold loading principle. The objective of the study was to measure inspiratory muscle activity and oxygen saturation during this test. METHODOLOGY: Ten female volunteers were studied, with age 25,29 ±] 1,38 yrs, weight 54,86 ±] 7,17 kg, height 1,62 ±] 0,08 cm, Pimax -85,71 ±] 12,88 and vital capacity 511,03 ±] 114,21. Oxygen saturation (Sat%O2) and breathing rate (BR) were monitored. Loads of zero (standard), 10, 20 and 30 cmH2O was instituted at each 4 min. Surface electrodes were placed over the upper (sternocleidomastoids muscle) and lower portion of the rib cage. Paired t-Student test, statistical significance was set at p<0,05. RESULTS: BR in the standard phase was 18,89 ±] 5,37 and decreased in at the loadings of 20 and 30 cmH2O. Sat%O2 in the standard phase was 98,03 ±] 0,57 and decreased in at the loadings of 20 and 30 cmH2O, 97,14 ±] 1,67 and 97,57 ±] 0,50. The sternocleidomastoids electromyographic activity presented a larger activity for the 30 cmH2O loading. Electromyographic activity in the muscles of the lower portion of the rib cage increased in all the resistive loadings. CONCLUSIONS: The findings suggest that occurred: an adjustment in rating and in breathing pattern at slow and deep levels to minimize the ventilatory work; a decrease in oxygen saturation due to a larger muscular metabolic activity; an increase in electromyographic activity of the muscles of the lower rib cage at the incremental loadings; an activation of the accessory musculature in larger resistive loadings as the sternocleidomastoids.

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E. Nobre, A. Dornelas de Andrade, A. L. Gusmao, P. Marinho, N. Moraes, M. D. G. Rodrigues Machado, L. N. Cordeiro (Recife, Juazeiro do Norte, Brazil). Activity of the respiratory muscles and saturation of oxygen during test of respiratory muscles endurance. Eur Respir J 2002; 20: Suppl. 38, 1158

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