Table 23-4
Physiologic, Performance and Hematological Characteristics
prior to and 24 hours after the reinfusion of 750ml of packed Red Blood
cells. (From Robertson, R.J., et al.: Effect of induced erythrocythemia
on hypoxia tolerance during exercise. J. Appl. Physiol., 53:490,
1982.)
|
Pre-Infusion |
Post-Infusion |
Difference |
Difference, % |
| Hemoglobin, g . 100 ml blood-1 |
13.8 |
17.6 |
3.8* |
+27.5* |
| Hematocrit°, % |
43.3 |
54.8 |
11.5* |
+26.5* |
| Submaximal VO2 l . min-1 |
1.60 |
1.59 |
-0.01 |
-0.6 |
| Submaximal HR, b . min-1 |
127.4 |
109.2 |
18.2 |
-14.3* |
| Max VO2, l . min-1 |
3.28 |
3.70 |
0.42* |
+12.8* |
| Max HR, b . min-1 |
181.6 |
180.0 |
-1.6 |
-0.9 |
| Treadmill Run Time, sec |
793 |
918 |
125* |
+15.8 |
* Hematocrit is presented as the percent (%) of 100
ml of whole blood occupied by the red blood cells.
* Difference is statistically significant.
|
As shown in the figure above the hemoglobin concentration
remains maximally elevated for at least two weeks after infusion and remains
high for two to three months. Countless experiments have shown that the
increase in hemoglobin concentration results in an increse in VO2
max. Although the procedure of blood doping is illegal it is also quite
cumbersome. A more recent procedure which is also illegal is one that is
called hormonal blood boosting. In hormonal blood boosting a hormone that
is normally produced in the kidneys which causes an increase i the synthesis
of red blood cells is directly injected into the athelete some few weeks
before the atheletic event. The hormone is called erythropoeitin (EPO) and
it is the hormone that is naturally secreted by a person who is experiencing
hypoxia. This hypoxia is either exercise induced hypoxia or high altitude
induced hypoxia. In any case even though this procedure is quite dangerous
and several deaths have been attributed to it, it certainly appears to work.
Because the EPO that is administered is synthetic it is detectable using
a sophisticated urine test. Because of the above risks and legal aspect
of either blood doping or hormonal blood boosting the American College of
Sports Medicine states that "any blood doping procedure used in an
attempt to improve atheletic performance is unethical, unfair, and exposes
the athelete to unwarranted and potentially serious health risks. Blood
doping can improve the athelete's ability to perform submaximal and maximal
endurance exercise. In addition blood doping can help reduce physiologic
strain during exercise in the heat and perhaps altitude.
|