1998 Fiscal Year Final Research Report Summary
Disposition of lactate produced in exercise
| Project/Area Number |
08458013
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
体育学
|
|---|
| Research Institution | HOKKAIDO UNIVERSITY |
|---|
Principal Investigator |
YANO Takuo Fac.Edu., Hokkaido Univ., Asso.Pro., 教育学部, 助教授 (80200559)
|
|---|
| Project Period (FY) |
1996 – 1998
|
| Keywords | Blood Lactate / excess Oxygen Uptake / exces CO_2 output / exercise mode |
|---|
| Research Abstract |
Oxygen uptake during constant-load exercise is distinguished into three phases. Among these phases, the third phase is called as slow component or excess oxygen uptake since the increasing rate of oxygen uptake is slowest. The factor affecting the third phases was examined by comparing the oxygen up take during exercise with that during recovery. As a result, excess oxygen uptake per increase of blood lactate was higher in exercise than in recovery. Therefore, the excess oxygen uptake is not explained only by the increase of lactate. We also compared the oxygen uptake during arm exercise with that during the arm exercise combined the leg exercise. As a result, excess oxygen uptake per lactate increase was higher in combined exercise than in arm exercise. This is not also explained only by lactate rise.
Excess oxygen uptake during decremental-load exercise tended to be related to lactate when decremental rate of load was reduced. Therefore, when decremental rate of load is zero, i. e. at constant-load exercise, excess oxygen uptake is supposed to be related to lactate increase. Furthermore, when excess oxygen uptake during decremental phase in triangle-load exercise was compared with that in trapezoid-load exercise with the same peak work rate, the excess oxygen uptake in trapezoid-load exercise was higher than in triangle-load exercise as lactate is increased higher in decremental phase than in trapezoid exercise.
Thus, excess oxygen uptake seemed to be not only related to lactate increase but also the other factors.
As lactic acid is strong acid, this should be buffered. According to the buffering, C02 output is excessively expired. In the intensive exercise with short duration, this CO2 excess was observed mainly during recovery. This delay was not fully explained by the present experiment, further study is needed.
|
