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Agreement Between Bioelectrical Impedance and Dual-Energy X-Ray Absorptiometry to Track Changes in Fat-Free Mass After Resistance Training in Older Women

Nascimento, Matheus A.1,2; Silva, Danilo R.P.2; Ribeiro, Alex S.3; Pina, Fábio L.C.2; Gerage, Aline M.2,4; Gobbo, Luís A.5; Mayhew, Jerry L.6; Cyrino, Edilson S.2

The Journal of Strength & Conditioning Research: May 23, 2018 - Volume Publish Ahead of Print - Issue - p
doi: 10.1519/JSC.0000000000002581
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Nascimento, MA, Silva, DRP, Ribeiro, AS, Pina, FLC, Gerage, AM, Gobbo, LA, Mayhew, JL, and Cyrino, ES. Agreement between bioelectrical impedance and dual-energy x-ray absorptiometry to track changes in fat-free mass after resistance training in older women. J Strength Cond Res XX(X): 000–000, 2018—The aim of our study was to compare the agreement between bioelectrical impedance (BIA) and dual-energy X-ray absorptiometry (DXA) to track changes on fat-free mass (FFM) after a resistance training (RT) program in older women. Forty-three older women (65.2 ± 4.6 years, 59.5 ± 9.2 kg, 156.4 ± 6.0 cm, 24.3 ± 3.3 kg·m−2) participated in a RT intervention (12 weeks, 8 exercises, 2 sets, 10–15 repetitions, 3 nonconsecutive days per week). Fat-free mass changes were determined by a single-frequency BIA device (EQ1), 6 BIA prediction equations for older women (EQ2, EQ3, EQ4, EQ5, EQ6, and EQ7), and DXA. At pretraining, 3 equations overpredicted, and 3 underpredicted DXA FFM (F = 244.63, p < 0.001), although all equations had high correlations with DXA (r = 0.78–0.83). After training, 4 equations overpredicted and one underpredicted DXA FFM (F = 176.25, p < 0.001). Dual-energy X-ray absorptiometry detected significant gains in FFM (0.65 ± 0.82 kg; p < 0.05), as did EQ3 (0.55 ± 1.69 kg; p < 0.05), and EQ4 (0.61 ± 1.88 kg; p < 0.05), whereas the remaining equations did not indicate significant changes in FFM. Low correlations between FFM and equation change values suggest that single-frequency BIA-derived equations may not provide sufficient accuracy to track changes in FFM after 12 weeks of RT in older women.

1Paraná State University—UNESPAR, Paranavaí, Paraná, Brazil;

2Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, Paraná, Brazil;

3Center for Research in Health Science, University of Northern Paraná—UNOPAR, Londrina, Paraná, Brazil;

4Department of Physical Education, Federal University of Santa Catarina, Florianopolis, Brazil;

5Department of Physical Education, School of Technology and Science, Sa[Combining Tilde]o Paulo State University, Presidente Prudente, Sa[Combining Tilde]o Paulo, Brazil; and

6Exercise Science Department, Truman State University, Kirksville, Missouri

Address correspondence to Matheus A. Nascimento, matheusamarante@hotmail.com.

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