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Memorias de investigación
Research Publications in journals:
V(T)/ t(I) relationship during steady-state exercise on a treadmill at the intensity close to second ventilatory threshold
Year:2008
Research Areas
  • Physiology,
  • Physical education and sport
Information
Abstract
INTRODUCTION: Few works have approached the study of the tidal volume/inspiratory time (V(T)/ t(I)) relationship during long and constant load exercise in treadmill. The aim of the present study was to analyze the relationship V(T)/ t(I) to an intensity corresponding to the mean point among the two ventilatory thresholds. MATERIAL AND METHODS: Twenty-four males have participated, carrying out two tests in treadmill: (1) maximal incremental test and (2) a 30 minutes constant load test at the intensity corresponding to the mean point among the two ventilatory thresholds. The respiratory parameters, acid-base parameters and lactate concentration was analysed during the constant load test. RESULTS: The breakpoint of relationship V(T)/ t(I) during the maximum test was reached at V(T) 2886 (465) mL, tI 0.57 (0.10) s and oxygen uptake (VO2) 4606 (532.9) mL/min. During the effort at constant load the relationships V(T)/ t(I), and tI/ tTOT (inspiratory time/total time) were significantly lower to those corresponding to the breakpoint of Hering-Breuer (PHB). Although the lactate concentration was superior to 4 mmol/L, the parameters of the acid-base state stayed inside the limits that allowed to conclude the whole test. CONCLUSIONS: A value of the relationship V(T)/ t(I) is adopted below the PHB, determinated with a maximum test, during an effort of 30 minutes at an intensity corresponding to the mean point among the two ventilatory thresholds. Both, carbon dioxide pressure end tidal values (Pet CO2) and the acid-base state, stay stable and below the values corresponding to the PHB.
International
Si
JCR
Si
Title
REVISTA DE INVESTIGACION CLINICA
ISBN
0034-8376
Impact factor JCR
0,324
Impact info
Volume
60
Journal number
4
From page
297
To page
302
Month
JULIO
Ranking
Participants
  • AUTOR: IRMA LORENZO CAPELLÁ (UNIVERSIDAD POLITECNICA DE MADRID)
  • Autor: Pedro Jose Benito Peinado (UPM)
  • Autor: Victor Diaz Molina (UPM)
  • Autor: Ana Belen Peinado Lozano (UPM)
  • Autor: Fco. Javier Calderon Montero (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Grupo de Inv. del Laboratorio de Fisiología del Esfuerzo
  • Departamento: Salud y Rendimiento Humano
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