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Subtle long-term cognitive effects of a single mild traumatic brain injury and the impact of a three-month aerobic exercise intervention.

Author(s): Larson-Dupuis C, Léveillé E, Desjardins M, Jodoin M, Bourassa MÈ, Bergeron H, Beaulieu C, Carrier J, Pepin V, De Beaumont L...

BACKGROUND: Although there is a growing body of literature on the impact of multiple concussions on cognitive function with aging, less is known about the long-term impact of sustaining a single mi...

Article GUID: 32878422
Validity of electrical impedance myography to estimate percent body fat: comparison to bio-electrical impedance and dual-energy X-ray absorptiometry

Author(s): van Rassel CR; Bewski NA; O' loughlin EK; Wright A; Scheel DP; Puig L; Kakinami L;

Background: Assessment of percent body fat (%BF) is typically measured with bioelectrical impedance (BIA) as a proxy for dual-energy X-ray absorptiometry (DXA). Notably, poorer agreement between BIA and DXA among persons who are overweight or obese has been...

Article GUID: 30024123
Title:Validity of electrical impedance myography to estimate percent body fat: comparison to bio-electrical impedance and dual-energy X-ray absorptiometry
Authors:van Rassel CR,  Bewski NA,  O',  loughlin EK,  Wright A,  Scheel DP,  Puig L,  Kakinami L, 
Link:https://pubmed.ncbi.nlm.nih.gov/30024123/
DOI:10.23736/S0022-4707.18.08505-5
Category:J Sports Med Phys Fitness
PMID:30024123
Dept Affiliation: PERFORM
1 Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada.
2 INDI Department, Concordia University, Montreal, QC, Canada.
3 Hospital Research Center of Montreal University (CRCHUM), Montreal, QC, Canada.
4 PERFORM Center, Concordia University, Montreal, QC, Canada.
5 Department of Mathematics and Statistics, Concordia University, Montreal, QC, Canada.
6 PERFORM Center, Concordia University, Montreal, QC, Canada - lisa.kakinami@concordia.ca.

Description:

Background: Assessment of percent body fat (%BF) is typically measured with bioelectrical impedance (BIA) as a proxy for dual-energy X-ray absorptiometry (DXA). Notably, poorer agreement between BIA and DXA among persons who are overweight or obese has been reported. The use of electrical impedance myography (EIM) as a proxy for DXA has not been validated. The objective was to evaluate an EIM device and two multi-frequency BIA devices with the reference standard (DXA) stratified by weight status and gender.

Methods: In a convenience sample of 82 adults, %BF assessed by EIM and two BIA devices was compared to DXA. Agreement between devices was tested with intra-class correlation coefficients (ICC) and Bland-Altman plots.

Results: Agreement between DXA and EIM (ICC=0.77) was poorer than the agreement between either BIA device with DXA (ICC>0.87). Stratified by sex, agreement between EIM and DXA was greater for men than women (ICC=0.81 and ICC=0.61, respectively). Stratified by BMI, agreement between EIM and DXA was best for normal-weight individuals (ICC=0.89) and progressively poorer for overweight (ICC=0.80) and obese (ICC=0.67) individuals. Bland-Altman plots revealed wide limits of agreement and an increase in EIM mean difference as average %BF increased. Similar trends were seen in BIA assessments.

Conclusions: EIM and BIA substantially underestimate %BF in overweight and obese individuals. Wide limits of agreement coupled with variable ICC limit device interchangeability with one another and limit clinical utility.