Validity of Bioelectric Impedance in Relation to Dual-Energy X-Ray Absorptiometry for Measuring Baseline and Change in Body Composition After an Exercise Program in Stroke

Vanzella, LM, Lawand, R, Shuaib, M, Oh, P, Corbett, D, and Marzolini, S. Validity of bioelectric impedance in relation to dual-energy x-ray absorptiometry for measuring baseline and change in body composition after an exercise program in stroke. J Strength Cond Res 36(12): 3273–3279, 2022—Exercise is an important strategy to improve fat-free mass (FFM) and reduce percent fat mass (FM%). However, no study has reported on a valid, cost-effective method to measure changes in body composition after stroke. The purpose of the study is to determine the level of agreement between bioelectrical impedance analysis (BIA) and dual-energy x-ray absorptiometry (DXA) for assessing baseline and change in FFM and FM% after an exercise training intervention for individuals with mobility deficits after stroke. Fat-free mass and FM% were measured by BIA and DXA at the beginning and after 6 months of participation in an exercise program for individuals with mobility deficits after stroke. Forty-two subjects after stroke were included. Overall, Bland-Altman plots revealed that BIA overestimated the baseline FFM and FM% by only −0.4 ± 1.8 kg and −2.8 ± 1.8%, respectively. BIA underestimated changes in FFM by 0.33 ± 0.45 kg and overestimated changes in FM% by −0.40 ± 0.68%. The 95% CI of the mean bias for baseline FFM was −7.1 to 6.3 kg and −11.8 to 6.0% for FM%, demonstrating good agreement. The 95% CI for the change in FFM was −3.8 to 4.5 kg and −5.0 to 4.2% for FM%, which r...
Source: Journal of Strength and Conditioning Research - Category: Sports Medicine Tags: Original Research Source Type: research