title: Inadequacy of first and second order models to characterize the heart rate response induced by dynamic exercise.
abstract: Six normal subjects were submitted to dynamic exercise at workloads of 25, 50, 100 and 150 w for 4 min, intercalated by periods of rest, before and after an aerobic training period of 10 weeks. The heart rate response was fitted to 2 mathematical models, a 1st-order model and a 2nd-order model. The results indicate that these 2 models were not adequate to characterize the physiological response of heart rate induced by dynamic exercise.
authors.affiliation: Hospital das Clínicas, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Brasil.
authors.forename: E
authors.initials: E
authors.lastname: Silva
authors.forename: L E
authors.initials: LE
authors.lastname: Martins
authors.lastname: Gallo L Júnior
authors.forename: B C
authors.initials: BC
authors.lastname: Maciel
authors.forename: J A
authors.initials: JA
authors.lastname: Marin-Neto
authors.forename: E C
authors.initials: EC
authors.lastname: Lima-Filho
mesh_terms: D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D008905:Minicomputers; D008954:Models, Biological; D008962:Models, Theoretical