Paraná State University-UNESPAR, Paranavaí, Paraná, Brazil.
Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, Paraná, Brazil.
J Strength Cond Res. 2020 Jun;34(6):1700-1708. doi: 10.1519/JSC.0000000000002581.
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 34(6): 1700-1708, 2020-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) 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.
Nascimento, MA, Silva, DRP, Ribeiro, AS, Pina, FLC, Gerage, AM, Gobbo, LA, Mayhew, JL, 和 Cyrino, ES. 用生物电阻抗和双能 X 射线吸收法评估抗阻训练后老年女性去脂体重的变化。《力量与调节研究杂志》34(6): 1700-1708, 2020-本研究旨在比较生物电阻抗（BIA）和双能 X 射线吸收法（DXA）在老年女性抗阻训练（RT）后跟踪去脂体重（FFM）变化的一致性。43 名老年女性（65.2 ± 4.6 岁，59.5 ± 9.2kg，156.4 ± 6.0cm，24.3 ± 3.3kg·m）参加了为期 12 周的 RT 干预（12 周，8 项运动，2 组，10-15 次重复，3 天非连续）。FFM 变化由单频 BIA 设备（EQ1）、6 个专为老年女性设计的 BIA 预测方程（EQ2、EQ3、EQ4、EQ5、EQ6 和 EQ7）和 DXA 确定。在训练前，3 个方程高估，3 个低估 DXA 的 FFM（F = 244.63，p < 0.001），尽管所有方程与 DXA 的相关性均较高（r = 0.78-0.83）。训练后，4 个方程高估，1 个低估 DXA 的 FFM（F = 176.25，p < 0.001）。DXA 检测到 FFM 显著增加（0.65 ± 0.82kg；p < 0.05），EQ3（0.55 ± 1.69kg；p < 0.05）和 EQ4（0.61 ± 1.88kg；p < 0.05）也是如此，而其余方程并未表明 FFM 有显著变化。FFM 与方程变化值之间的低相关性表明，单频 BIA 衍生方程可能无法提供足够的准确性来跟踪老年女性 12 周 RT 后的 FFM 变化。
