ISSN:
1439-6327
Keywords:
Human exercise
;
Metabolic acidosis
;
Blood lactate
;
Respiration
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract In these studies, we examined whether the rightward shift in steady-state minute ventilation ( $$\dot V$$ E) versus O2 uptake curves after training is more closely linked to the reduced CO2 production from carbohydrate oxidation (CHOOX) after training than to the attenuated increase in blood lactate concentration. Steady state $$\dot V$$ E values and gas exchange were measured in eight previously sedentary men who underwent exercise tests of 60 W + 40 W every 6 min before and after a 9 week training programme of cycling approximately 40 min a day. Following training, the slower rises in $$\dot V$$ E with increasing exercise intensities were associated with a reduced reliance on CHOOX, (P 〈 0.01). Both before and after training, $$\dot V$$ E values in litres per minute rose as a linear $$\dot V$$ E = 18 · CHOOX + 14, function of rates of CHOOX in grams per minute (r = 0.99), irrespective of a marked shift to the right in arterialized venous blood lactate concentration versus CHOOX curves following training (P 〈 0.01). Thus, slower increases in steady-state $$\dot V$$ E values with increasing exercise intensities following endurance training appeared to be more closely linked to the decreased reliance on CHOOX than to the attenuated increase in blood lactate concentration.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00238555
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