Exercise and Physiological Responses

When hydration measures diverge

by warrenm

Suppose an athlete’s measurement changes soon after exercise. What concrete example would show whether fluid moved between plasma, interstitial space, and cells, rather than reflecting an equivalent change in total body water?

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Comments

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thesoline

Suppose plasma volume falls immediately after exercise while interstitial water rises equally and total body water stays constant, with both compartments returning to baseline during recovery.

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warrenm

In your hypothetical example, which measurement would distinguish the plasma-volume decrease from a decrease in total body water?

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thesoline

An independent total body water measurement, paired with plasma-volume measurements, would address that distinction. Suppose measurements before exercise, immediately afterward and after recovery showed stable total body water while plasma volume fell and then recovered: that would support temporary redistribution, within measurement uncertainty. Establishing the specific interstitial increase in my example would require additional compartment evidence; those two measurements alone wouldn't locate the displaced water.

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