Saliva - better than urine for hydration status? 🧐
The new "practical" gold standard?
Associations Between Skeletal Muscle Mass, Fat-Free Mass, and Saliva Osmolality: A Cross-Sectional Study
Study Details
This new study investigated the relationship between…
💪 Skeletal muscle mass (SMM)
🦴 Fat-free mass (FFM)
…and hydration status measured through saliva osmolality (SOSM) 💦
Key Findings
In a cohort of 72 adults, no significant relationships were found between either body composition variable and SOSM ❎
Adjusted analysis including covariates…
🎂 Age
👫 Sex
🥤 Past 4-hour fluid intake
⏰ Time of sampling
…showed nearly no effect, with insignificant associations ❎
Conclusion
These results indicate that saliva osmolality may accurately be able to assess hydration status without being influenced by SMM or FFM ✅
These two body composition variables can heavily influence urinary hydration markers due to high concentrations of muscle metabolites (e.g. creatinine, urea) 🔬
Causing erroneous hydration test results (often reading as dehydrated) ⚠️
Therefore, salivary markers may be more accurate ✅
Reference
https://pubmed.ncbi.nlm.nih.gov/41495917/
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