[Application of the wave-speed theory to analysis of mechanical mechanism for configuration of F-V curve in normal humans].
F-V curves were performed in 572 normal male and female adolescents with DFM-86 flow-volume recorder as well as 262 normal male and female adults with LR-80 flow-volume recorder. The mechanical mechanism for the formation of the configuration in normal F-V curves was analysed with the wave-speed theory. The configurations of F-V curves were classified into 4 types, i.e. the plateau, linear, convex and concave types. The plateau type was characterized by: (1) a fast descent just after the peak; (2) a subsequent slow descending plateau; (3) the second fast descent forming a bump or knee; (4) lastly a slow descending tail, possibly with small bumps. The other 3 types were considered as variations of the plateau type. The mechanical mechanism for the formation of the plateau type was chiefly analysed with the wave-speed theory. Our investigation suggested that previous studies on the F-V curve configuration in models and animals with the wave-speed theory could be extended to the exploration in human beings.
Huang
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Li
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Huang
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D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008449:Maximal Expiratory Flow-Volume Curves / Q000502:physiology*; D008875:Middle Aged; D012016:Reference Values