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Systemic adenosine deaminase administration does not reduce active hyperemia in running rats
R E Klabunde1, M H Laughlin, R B Armstrong
1Department of Physiology, West Virginia University Medical Center, Morgantown 26506.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 1, 1988
Summary
Adenosine does not appear to control skeletal muscle blood flow during exercise. Adenosine deaminase (ADA) treatment did not alter blood flow distribution or magnitude in rat hindlimb muscles during treadmill exercise.
Area of Science:
- Exercise Physiology
- Skeletal Muscle Metabolism
- Cardiovascular Regulation
Background:
- Adenosine is a key regulator of blood flow, particularly in response to metabolic demands.
- Its role in skeletal muscle blood flow during locomotor activity requires further elucidation.
Purpose of the Study:
- To investigate the role of adenosine in modulating skeletal muscle blood flow during exercise.
- To determine if adenosine influences blood flow distribution within and among hindlimb muscles in rats.
Main Methods:
- Systemic infusion of adenosine deaminase (ADA) to reduce adenosine levels in rats.
- Measurement of hindlimb muscle blood flow using the labeled microsphere technique before and during treadmill exercise.
- Analysis of blood flow in 28 hindlimb muscles and non-muscular tissues.
Main Results:
- ADA infusion significantly decreased muscle adenosine levels by 64% during ischemic contraction.
- No significant differences in total or regional skeletal muscle blood flow were observed between ADA-treated and control rats during exercise.
- Pre-exercise and exercise blood flow patterns remained consistent regardless of ADA treatment.
Conclusions:
- Adenosine does not play an essential role in controlling skeletal muscle blood flow during normal locomotor activity in rats.
- The findings do not support the hypothesis that adenosine is a primary determinant of exercise-induced hyperemia in skeletal muscle.