Acute water ingestion influences lean soft tissue estimation from dual-energy x-ray absorptiometry: implications for clinical diagnosis
Study Details
This new study examined how acute water intake affects DXA-derived lean soft tissue estimates in 46 adults, with participants consuming 0, 250, 500 or 1000 mL of water 🔍
Body composition was measured at baseline, immediately post-intake, and at 30, 60 and 90 minutes 🩻
Key Findings
💧 Larger water intakes significantly increased whole-body lean soft tissue measured by DXA
📈 Drinking 1000 mL increased lean soft tissue significantly more than all other conditions
🥤 The 500 mL condition also produced higher lean soft tissue at 90 minutes compared with 250 mL and control
🎯 Most of the apparent increase came from the trunk rather than the limbs
📊 Trunk lean soft tissue accounted for 53–99% of the change in whole-body lean soft tissue
💪 Appendicular lean soft tissue was not significantly affected by acute water intake
🦵 This suggests DXA-based appendicular lean mass may be relatively robust to short-term water intake
🧍♂️ Whole-body lean mass estimates are more vulnerable to hydration-related error and may be artificially inflated after drinking
Conclusion
Pre-scan hydration can meaningfully alter DXA-derived whole-body lean mass even without any real change in tissue ⚠️
Limiting water intake to <500 mL within 90 minutes of a scan is crucial💧
For longitudinal DXA tracking, consistent pre-scan hydration practices and standardisation are important to improve measurement reliability ✅
Reference
https://pubmed.ncbi.nlm.nih.gov/42668016/
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