Relationship between CO2 excess due to lactic acid production during exercise and endurance performance.
- VernacularTitle:運動時の乳酸生成によるＣＯ２過剰排出と持久性パフォーマンスの関係
- Author:
KOHJI HIRAKOBA
;
ATSUO MARUYAMA
;
KOHJI MISAKA
- Publication Type:Journal Article
- Keywords:
CO2 excess;
lactate;
blood gas;
endurance performance
- From:Japanese Journal of Physical Fitness and Sports Medicine
1990;39(1):69-77
- CountryJapan
- Language:Japanese
-
Abstract:
A study was conducted to assess the relationship between CO2 excess due to lactic acid production during exercise and endurance performance in order to clarify the availability of CO2 excess as an index of endurance capacity. Four healthy males (control group; CON) aged 21-24 years, and six male long-distance runners (LDR) aged 18-22 years, were subjected to incremental maximal testing on a cycle ergometer and 12-min exhaustive track running. The results obtained are summarized as follows.
1) Mean values (±SD) of CO2 excess (ml) were 3, 442±677 ml for LDR and 2, 667±437 ml for CON, respectively. On the other hand, the mean value of CO2 excess per unit body weight (CO2 excess/w) obtained in LDR (59.1±9.07 ml⋅kg-1) was significantly higher than that in CON (40.3±3.54 ml⋅kg-1) (p<0.01) .
2) The ratio of CO2 excess/w to ΔLA (the difference between blood lactate at 1 min after exercise and that at rest) showed a tendency to be higher in LDR (5.59±1.16 ml⋅kg-1⋅mmol-1) than in CON (4.46±0.69 ml⋅kg-1⋅mmol-1) . However, there was no significant difference between these two groups in the ratio of CO2 excess/w to ΔLA.
3) The CO2 excess/w (ml⋅kg-1) was significantly related to Vo2max (r=0.813, p<0.01) and Vo2AT (r=0.892, p<0.001), respectively. Moreover, CO2 excess/w was significantly correlated with ΔHCO3- (the difference between blood bicarbonate at l min after exercise and that at rest) (r=0.649, p<0.05) .
4) The CO2 excess (ml) and CO2 excess/w (ml⋅kg-1) were significantly correlated with 12-min exhaustive running performance (r=0.715, p<0.05, r=0.933, p<0.001), as was the ratio of CO2 excess/w to d LA (r=0.671, p<0.05) .
5) From these results, it was suggested that the CO2 excess/w and the ratio of CO2 excess/w to ΔLA could be important factors related to performance of endurance exercise (i. e., 3, 000-5, 000 m running) accompanied by blood lactate accumulation.
