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Plasma volume shifts during progressive arm and leg exercise
Summary
Muscle mass influences plasma volume (PV) shifts during exercise. Both arm crank and cycle exercise showed similar maximal plasma volume efflux (18%) when intensity was normalized, suggesting mean arterial pressure is key.
Area of Science:
- Exercise Physiology
- Cardiovascular Physiology
Background:
- Muscle mass and exercise intensity impact plasma volume (PV) shifts.
- Understanding these shifts is crucial for exercise performance and fluid balance.
Purpose of the Study:
- To investigate the influence of upper (arm crank) versus lower body (cycle) exercise on plasma volume shifts.
- To determine the relationship between exercise intensity, mean arterial pressure, and plasma volume efflux.
Main Methods:
- Nine healthy males performed incremental arm crank (AC) and cycle (CY) ergometry.
- Plasma volume efflux and mean arterial pressure (MAP) were measured at various submaximal and maximal oxygen uptake (VO2) levels.
Main Results:
- At a given submaximal VO2, PV efflux was higher during AC than CY exercise.
- When normalized for relative exercise intensity (% peak VO2), PV efflux was similar for both AC and CY, reaching 18% maximal efflux.
- Mean arterial pressure (MAP) was higher for AC vs. CY at a given VO2, but normalized intensity-MAP relationships were similar.
Conclusions:
- Plasma volume efflux during exercise is primarily related to mean arterial pressure.
- The relative intensity of exercise, rather than the specific muscle groups used, is the critical factor in determining PV shifts.