Key result
During the first 70 seconds of recovery from light impulse-like exercise, there was a significant correlation (r=0.572 to 0.805) between ventilation and predicted arterial CO2 pressure.
Why the study?
Does PaCO2 drive ventilation during recovery from light impulse-like exercise without metabolic acidosis in healthy males?
Does PaCO2 drive ventilation during recovery from light impulse-like exercise without metabolic acidosis in healthy males?
Effect estimate: r=0.572 to 0.805
p-value: p=<0.05
Ventilation during the first 70 seconds of recovery from light impulse-like exercise is partly driven by PaCO2, while neural factors likely drive ventilation from 70 to 155 seconds.
PaCO2 may drive early ventilatory recovery after light exercise; leaves open neural mechanisms later and requires confirmation in larger studies.
We investigated ventilation (V(.)E) control factors during recovery from light impulse-like exercise (100 watts) with a duration of 20 s. Blood ions and gases were measured at rest and during recovery. V(.)E, end tidal CO(2) pressure (PETCO(2)) and respiratory exchange ratio (RER) were measured continuously during rest, exercise and recovery periods. Arterial CO(2) pressure (PaCO(2) (pre) was estimated from PETCO(2) and tidal volume (V(T)). RER at 20 s of exercise and until 50 s during recovery was significantly lower than RER at rest. Despite no change in arterialized blood pH level, PaCO(2) (pre) was significantly higher in the last 10 s of exercise and until 70 s during recovery than the resting value. V(.)E increased during exercise and then decreased during recovery; however, it was elevated and was significantly higher than the resting value until 155 s (p<0.05). There was a significant relationship between V(.)E and PaCO(2) (pre) during the first 70 s of recovery in each subject. The results suggest that PaCO(2) drives V(.)E during the first 70 s of recovery after light impulse-like exercise. Elevated V(.)E in the interval from 70 s until 155 s during recovery might be due to neural factors.
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Afroundeh et al. (2013) studied Healthy (n=6). 100 watts impulse-like exercise vs. Rest (baseline) was evaluated on Correlation between ventilation (VE) and predicted arterial CO2 pressure (PaCO2 pre) during the first 70 s of recovery (r=0.572 to 0.805, p=<0.05). During the first 70 seconds of recovery from light impulse-like exercise, there was a significant correlation (r=0.572 to 0.805) between ventilation and predicted arterial CO2 pressure.
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