Changes in blood plasma during progressive treadmill and cycle exercise

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Abstract
Fluid exchange between intra- and extravascular compartments was studied during progressive exercise on a treadmill and on a cycle ergometer. At room temperature (18-20.degree. C), 17 male subjects walked at 6 km/h on a treadmill at grades that increased 3%/3 min. Blood samples, O2 uptake (.ovrhdot.VO2) and heart rates (HR) were obtained at rest and during the final minute at each grade. This regimen was repeated after 20 days of training. Eight untrained men were subjected to a similar regimen on a cycle ergometer. Exercise level was increased by 0.5 kilopond/2 min at 50 rpm. Blood samples, .ovrhdot.VO2 and HR were obtained at rest and during the final minute at each exercise level. No relationship was found between .ovrhdot.VO2 and vascular volume fluid shifts during treadmill exercise and training did not alter the response. A significant relationship was found for exercise level and hemoconcentration during cycle exercise (%.DELTA. hematocrit = 0.099% .ovrhdot.VO2 max - 1.67, r = 0.8). Differences in lactate concentration were also observed. For both exercises significant differences existed between the changes in [Na+] and [Cl-] within the vascular volume. Protein left the vascular volume during cycle exercise but not during treadmill exercise. The fluid dynamics in these 2 forms of leg exercise were decidedly different.