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This is a Quantitative Study study.

Reduction in respiratory muscle strength following a series of preparatory and maximal static, dry breath-holds

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This observational analysis identifies respiratory muscle fatigue in divers, linking it to greater arterial hypoxemia.

There was a significant reduction in respiratory muscle strength after breath-hold sessions, indicating fatigue.
Maximal inspiratory pressure and maximal expiratory pressure decreased significantly, showing respiratory challenges faced.
Around 50% of divers exhibited respiratory muscle fatigue correlating with reduced O2 delivery during breath-holding.
Findings highlight the physiological stress of breath-hold diving and potential for muscle fatigue under low oxygen conditions.

Hubbard et al. (2025) studied this question.

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