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: Twentyfour 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, acidbase 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 HeringBreuer (PHB). Although the lactate concentration was superior to 4 mmol/L, the parameters of the acidbase 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 acidbase state, stay stable and below the values corresponding to the PHB.  
International

Si 
JCR

Si 
Title

REVISTA DE INVESTIGACION CLINICA 
ISBN

00348376 
Impact factor JCR

0,324 
Impact info


Volume

60 


Journal number

4 
From page

297 
To page

302 
Month

JULIO 
Ranking
