P570 - BODY COMPOSITION WITH BIOELECTRICAL IMPEDANCE ANALYSIS: AGREEMENT BETWEEN MEASUREMENT ON LEFT AND RIGHT SIDES OF THE BODY

P570

BODY COMPOSITION WITH BIOELECTRICAL IMPEDANCE ANALYSIS: AGREEMENT BETWEEN MEASUREMENT ON LEFT AND RIGHT SIDES OF THE BODY

G. E. C. Slager^1,2,*, H. R. Tietsma², A. S. Beenen², A. S. Niemeijer³, M. K. Nieuwenhuis^1,3,4, M. J. Sealy¹

¹Research Group Healthy Ageing, Allied Health Care and Nursing, ²Department of Physiotherapy, Hanze University of Applied Sciences, ³Alliance of Dutch Burn Care, Burn Center, Martini Hospital Groningen, ⁴Department for Human Movement Sciences, University of Groningen, University Medical Center Groningen, Groningen, Netherlands

Rationale: In single-frequency 50 kHz bioelectrical impedance analysis (BIA) measurements, per protocol, patients are measured on the right side of the body, which is not always possible with scars, amputations, burns, wounds, or practical limitations. We compared agreement of BIA-measured body composition between the right and the left sides of the body in healthy young adults.  

Methods: BIA measurements were performed with the Bodystat-500. All participants were double measured both on the right side and on the left side. Fat-free mass (FFM), fat mass (FM), appendicular skeletal muscle mass (ASM) and their indexes for stature (FFMI , FMI and ASMI) were determined, using Kyle’s formulae. Means (SD) were calculated. Intraclass correlation coefficient (ICC[3,1], 95%CI and the level of agreement (LOA), (right – left side), were determined, with Bland Altman plots.

Results: In 112 Caucasian participants (48 male, 64 female) the median age was 22 (IQR 21-24) years; mean BMI 23.2 (2.5) kg/m², ICC’s were excellent, ranging from 0.99 – 1.00 (95% CI: 0.99-1.00). Mean differences between both sides in body composition and LOAs were: FFM: 0.36 (-1.16; +1.87) kg, FM: -0.36 (-1.87; +1.16) kg, ASM: 0.18 (-0.61; +0.97) kg; FFMI: 0.11( -0.35; +0.58) kg/m² and ∆FMI: -0.11(-0.58; +0.35) kg/m², ASMI: 0.06 (-0.19; +0.30) kg/m².

Conclusion: The results of this study indicate that use of the right and the left side may be interchangeable with BIA for estimating body composition on group level, whereas further research is needed to assess if left and right are interchangeable on individual level. Interestingly, mean difference for ASM was lowest. With mixed use of left and right side measurements, ASM could be used rather than FFM, since ASM appears to differ the least.

Disclosure of Interest: None declared