Key result
Upright intense exercise and posture maintenance increased plasma volume by 2.4 ± 0.8 ml/kg at 22 hours, whereas supine exercise and posture decreased it by 2.1 ± 0.8 ml/kg.
Why the study?
Does upright versus supine posture after intense exercise alter plasma volume expansion and albumin content in healthy subjects?
Does upright versus supine posture after intense exercise alter plasma volume expansion and albumin content in healthy subjects?
Upright posture after intense exercise promotes plasma volume expansion and increased plasma albumin content compared to supine posture.
Answers are grounded in this paper and cite their sources.
May support upright post-exercise posture for volume recovery in healthy subjects; leaves open effects on performance or clinical populations.
To test the hypothesis that exercise-induced hypervolemia is a posture-dependent process, we measured plasma volume, plasma albumin content, and renal function in seven healthy subjects for 22 h after single upright (Up) or supine (Sup) intense (85% peak oxygen consumption rate) exercise. This posture was maintained for 5 h after exercise. Plasma volume decreased during exercise but returned to control levels by 5 h of recovery in both postures. By 22 h of recovery, plasma volume increased 2.4 +/- 0.8 ml/kg in Up but decreased 2.1 +/- 0.8 ml/kg in Sup. The plasma volume expansion in Up was accompanied by an increase in plasma albumin content (0.11 +/- 0.04 g/kg; P < 0.05). Plasma albumin content was unchanged in Sup. Urine volume and sodium clearance were lower in Up than Sup (P < 0.05) by 5 h of recovery. These data suggest that increased plasma albumin content contributes to the acute phase of exercise-induced hypervolemia. More importantly, the mechanism by which exercise influences the distribution of albumin between extra- and intravascular stores after exercise is altered by posture and is unknown. We speculate that factors associated with postural changes (e.g., central venous pressure) modify the increase in plasma albumin content and the plasma volume expansion after exercise.
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Nagashima et al. (1999) studied Healthy (n=7). Upright intense exercise and posture maintenance vs. Supine intense exercise and posture maintenance was evaluated on Plasma volume change at 22 hours of recovery (ml/kg). Upright intense exercise and posture maintenance increased plasma volume by 2.4 ± 0.8 ml/kg at 22 hours, whereas supine exercise and posture decreased it by 2.1 ± 0.8 ml/kg.
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