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Plasma and platelet catecholamine and catecholamine sulfate response to various exercise tests
G Strobel1, B Friedmann, J Jost
1Department of Sports Medicine, University of Heidelberg, Germany.
The American Journal of Physiology
|October 1, 1994
Summary
Plasma norepinephrine sulfate (NE-S) levels after exercise reflect overall sympathoadrenergic activation. Platelet catecholamines (CA) and CA-S are less reliable indicators of sympathoadrenergic activity during prolonged exercise.
Area of Science:
- Exercise Physiology
- Biochemistry
- Sports Medicine
Background:
- Sympathoadrenergic activation is crucial during exercise.
- Catecholamines (CA) and their sulfates (CA-S) are key indicators.
- Understanding their reflection of exercise intensity is important.
Purpose of the Study:
- To test if platelet and plasma CA-S and platelet CA reflect sympathoadrenergic activation during prolonged exercise.
- To compare responses to different exercise intensities and durations.
Main Methods:
- Ten well-trained subjects performed graded exercise tests (LI and HI) and mixed-intensity protocols (HI/LI and LI/HI).
- Measurements included plasma and platelet catecholamine sulfates (CA-S) and catecholamines (CA).
Main Results:
- Plasma norepinephrine sulfate (NE-S) increased significantly after high-intensity (HI) exercise compared to low-intensity (LI).
- Plasma NE-S showed similar increases after mixed-intensity protocols, reflecting overall activation.
- Platelet CA and CA-S increased only after HI, indicating poor reflection of prolonged activation.
Conclusions:
- Plasma NE-S measured immediately post-exercise accurately reflects overall sympathoadrenergic activity during prolonged exercise.
- Platelet CA and CA-S are less reliable indicators of sympathoadrenergic activation compared to plasma NE-S.