Beyond vectorial bioelectrical impedance: Assessing body composition changes with novel electrical parameters in obese osteoarthritis patients on a meal-replacement diet.

A novel BIVA-based nutrition parameter (NP) showed high correlation with body cell mass standardized by height in both men and women.

• Correlation between NP and BCM/h was 0.96 for men (p<0.01) and 0.88 for women (p<0.01).
• Study included 272 patients (23.16% men; 76.84% women) with obesity and osteoarthritis.
• NP is derived from raw electrical BIA parameters without requiring estimation equations.

The novel hydration parameter (HP) correlated significantly with estimated total body water in both sexes.

• Correlation coefficient between HP and estimated total body water was 0.769 for men and 0.63 for women (p<0.01 in both cases).
• HP is based on raw BIVA electrical values and does not rely on regression-based estimation.
• The correlation was lower in women than in men.

The novel fat parameter (FP) correlated significantly with estimated fat mass standardized by height in both sexes.

• Correlation coefficient between FP and estimated fat mass (FM) standardized by height was 0.83 for men and 0.89 for women (p<0.01).
• FP is derived from raw BIA electrical parameters without estimation models.
• The correlation was slightly higher in women than in men.

Body weight and fat mass decreased significantly over 3 months of meal-replacement diet.

• Body weight decreased from 99.33 (±15.0) kg at baseline to 92.03 (±16.0) kg at 3 months (p<0.01).
• Fat mass decreased from 49.93 (±6.67) kg at baseline to 44.22 (±9.08) kg at 3 months.
• The intervention was a 3-month meal-replacement diet in patients with osteoarthritis prior to orthopedic surgery.
• This was a 1-group intervention study with anthropometry and BIA registered at baseline and 3 months.

Body cell mass (BCM) and fat-free mass did not change significantly over the 3-month meal-replacement intervention.

• There was no statistically significant difference in BCM or fat-free mass between baseline and 3 months.
• This suggests the meal-replacement diet preserved lean mass while reducing fat mass.
• The study population had obesity and osteoarthritis and were awaiting orthopedic surgery.

The novel nutrition parameter (NP) and fat parameter (FP) decreased significantly after 3 months of meal-replacement diet, while the hydration parameter (HP) did not change.

• NP decreased from +0.50 (±0.31) at baseline to +0.42 (±0.42) at 3 months (p=0.03).
• FP decreased from +0.49 (±0.17) at baseline to +0.38 (±0.16) at 3 months (p<0.01).
• There was no statistically significant difference in HP between baseline and 3 months.
• These novel parameters detected body composition changes consistent with those found by traditional regression-based estimates.

The study evaluated a new BIVA-based method to represent raw BIA electrical values as nutrition, hydration, and fat parameters without relying on estimation equations.

• Traditional BIA body composition estimation uses regression models, which may introduce error; the new method uses raw electrical parameters directly.
• The new parameters include a nutrition parameter (NP), hydration parameter (HP), and fat parameter (FP).
• The study was a 1-group intervention with 272 patients assessed at baseline and 3 months.
• Patients had obesity and osteoarthritis and were undergoing evaluation prior to orthopedic surgery.