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Relationship between Blood Lactate Concentration and Excessive CO2 Expiration During and after Ramp Exercise

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Title: Relationship between Blood Lactate Concentration and Excessive CO2 Expiration During and after Ramp Exercise
Authors: Yunoki, Takahiro Browse this author →KAKEN DB
Ogata, Hisayoshi Browse this author
Yano, Tokuo Browse this author
Keywords: Ramp exercise
Lactic acid
Carbon dioxide
End-tidal CO2 pressure
Issue Date: Sep-2003
Publisher: Japan Society of Exercise and Sports Physiology
Journal Title: Advances in Exercise and Sports Physiology
Volume: 9
Issue: 3
Start Page: 97
End Page: 103
Abstract: The purpose of this study was to examine the kinetics of excessively expired CO2 and the blood lactate concentration ([La-]) during and after ramp exercise. Six healthy males performed three different ramp exercise tests in which the work rate was increased as a ramp function at 10 W/min (R1O), 20 W/min (R20) and 40 W/min (R40). Excessive CO2 expiration during exercise (CO2 excess) significantly correlated with the [La-] increase during exercise (⊿[La-]). Excessive CO2 expiration during recovery (post CO2 excess) significantly correlated with the [La-] increase during recovery (post ⊿[La-]). However, CO2 excess in R40 was significantly lower compared with R20 and R1O, despite there being no significant difference in ⊿[La-] among the three tests. In addition, post CO2 excess showed a positive value even when post ⊿[La-] was zero. Endtidal CO2 pressure (PETCO2) decreased from the onset of respiratory compensation to about 10 min post-exercise in all tests. PETCO2 decrement during exercise tended to be greater in R1O than in R40, and PETCO2 decrement during post-exercise tended to be greater in R40 than in R1O. PETCO2 was significantly related to [La-] during both at exhaustion and at 10 min post-exercise. However, PETCO2 at the same [La-] was lower at 10 min post-exercise than at exhaustion. Furthermore, alactic O2 debt, which was calculated from O2 uptake kinetics during recovery, was significantly higher in R40 than in the other tests. These results suggest that there is a case in which the blood lactate is not always the cause of excessive CO2 expiration in response to ramp exercise. The decrease in PETCO2 and the H+ uptake-release by breakdown-resynthesis of phosphocreatine were thought to be main factors influencing the excessive CO2 expiration as well as the [La-] increase.
Type: article
Appears in Collections:教育学院・教育学研究院 (Graduate School of Education / Faculty of Education) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 柚木 孝敬

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