Even when athletes burn off more than half their muscle sugar, a body scan tool called BIS doesn’t see fake changes in muscle water — so it’s a reliable way to track body changes during training.

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Against

Evidence from Studies

Supporting (1)

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Community contributions welcome

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Muscle glycogen depletion does not alter segmental extracellular and intracellular water distribution measured using bioimpedance spectroscopy.

Randomized Controlled Trial

Human

2018 Jun 1

The study shows that even when muscles lose a lot of glycogen (which holds water), the water levels in the legs don’t appear to change according to BIS measurements, meaning the tool works well even when glycogen changes.

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Muscle glycogen depletion does not alter segmental extracellular and intracellular water distribution measured using bioimpedance spectroscopy.

Score: 45

DOI: 10.1152/japplphysiol.00666.2017

Similar Assertions

Even when young guys burn off a lot of muscle fuel (glycogen) in their legs over a day, a special body scan that measures water doesn’t pick up any change in leg water levels — meaning it might not notice the water shifts that happen when fuel stores drop.

45

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92%

After intense cycling, young men burn through a lot of muscle fuel (glycogen), but that doesn’t change how water is split between cells and surrounding areas in their arms, trunk, or legs—measured by a common body scan method.

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When young guys burn off a lot of energy during intense cycling, their muscles lose stored fuel (glycogen), but this doesn’t seem to change how water is distributed in their arms, legs, or body — at least not enough for common body scanners to detect.

45

0

82%